一切福田，不離方寸，從心而覓，感無不通。

Category Archives: Backend

Docker 安装 MongoDB

MongoDB 是一个免费的开源跨平台面向文档的 NoSQL 数据库程序。 1、查看可用的 MongoDB 版本 访问 MongoDB 镜像库地址： https://hub.docker.com/_/mongo?tab=tags&page=1。 可以通过 Sort by 查看其他版本的 MongoDB，默认是最新版本 mongo:latest。 你也可以在下拉列表中找到其他你想要的版本： 此外，我们还可以用 docker search mongo 命令来查看可用版本：

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$ docker search mongo
NAME                              DESCRIPTION                      STARS     OFFICIAL   AUTOMATED
mongo                             MongoDB document databases ...   1989      [OK]      
mongo-express                     Web-based MongoDB admin int...   22        [OK]      
mvertes/alpine-mongo              light MongoDB container          19                   [OK]
mongooseim/mongooseim-docker      MongooseIM server the lates...   9                    [OK]
torusware/speedus-mongo           Always updated official Mon...   9                    [OK]
jacksoncage/mongo                 Instant MongoDB sharded cluster  6                    [OK]
mongoclient/mongoclient           Official docker image for M...   4                    [OK]
jadsonlourenco/mongo-rocks        Percona Mongodb with Rocksd...   4                    [OK]
asteris/apache-php-mongo          Apache2.4 + PHP + Mongo + m...   2                    [OK]
19hz/mongo-container              Mongodb replicaset for coreos    1                    [OK]
nitra/mongo                       Mongo3 centos7                   1                    [OK]
ackee/mongo                       MongoDB with fixed Bluemix p...  1                    [OK]
kobotoolbox/mongo                 https://github.com/kobotoolb...  1                    [OK]
valtlfelipe/mongo                 Docker Image based on the la...  1                    [OK]

  2、取最新版的 MongoDB 镜像 这里我们拉取官方的最新版本的镜像：

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$ docker pull mongo:latest

  3、查看本地镜像 使用以下命令来查看是否已安装了 mongo：

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$ docker images

  在上图中可以看到我们已经安装了最新版本（latest）的 mongo 镜像。 4、运行容器 安装完成后，我们可以使用以下命令来运行 mongo 容器：

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$ docker run -itd --name mongo -p 27017:27017 mongo --auth

  参数说明： -p 27017:27017 ：映射容器服务的 27017 端口到宿主机的 27017 端口。外部可以直接通过 宿主机 ip:27017 访问到 mongo 的服务。 --auth：需要密码才能访问容器服务。 5、安装成功 最后我们可以通过 docker ps 命令查看容器的运行信息： 接着使用以下命令添加用户和设置密码，并且尝试连接。

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$ docker exec -it mongo mongo admin
# 创建一个名为 admin，密码为 123456 的用户。
>  db.createUser({ user:'admin',pwd:'123456',roles:[ { role:'userAdminAnyDatabase', db: 'admin'},"readWriteAnyDatabase"]});
# 尝试使用上面创建的用户信息进行连接。
> db.auth('admin', '123456')

  MongoDB 6.0 及以上版本使用以下命令：

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docker exec -it mongo mongosh admin

  from:https://www.runoob.com/docker/docker-install-mongodb.html

龙生   24 Nov 2023
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Java Xmll转Json工具类

先看效果： xml

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<?xml version="1.0" encoding="utf-8" ?>
<auibinsurancecallback>
<policyinfo>
<transtype>TKTS</transtype>
<eticketno>xxx</eticketno>
<flightnumber>xxx</flightnumber>
<flightdate>2019-10-16</flightdate>
<operatetime>2019-10-16 17:20:00</operatetime>
<insureno>1910161720056066735</insureno>
<agreeno>102160199</agreeno>
<policyno/>
<policyurl><![CDATA[]]></policyurl>
</policyinfo>
<returninfo>
<serialnumber>2019103015284949545354</serialnumber>
<retruncode>0</retruncode>
<errormessage><![CDATA[]]></errormessage>
</returninfo>
<list>
<item>
<name>john</name>
<age>22</age>
<log>
<record>1</record>
<record>2</record>
</log>
</item>
<item>
<name>lucy</name>
<age>23</age>
<log>
<record>
<id>1</id>
<event>event1</event>
</record>
<record>
<id>2</id>
<event>event2</event>
</record>
</log>
</item>
</list>
<list2>
<item>
<name>lily</name>
<age>24</age>
</item>
</list2>
</auibinsurancecallback>

  json

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{
"auibinsurancecallback": {
"policyinfo": {
"transtype": "TKTS",
"eticketno": "xxx",
"flightnumber": "xxx",
"flightdate": "2019-10-16",
"operatetime": "2019-10-16 17:20:00",
"insureno": "1910161720056066735",
"agreeno": "102160199",
"policyno": "",
"policyurl": ""
},
"returninfo": {
"serialnumber": "2019103015284949545354",
"retruncode": "0",
"errormessage": ""
},
"list": {
"item": [
{
"name": "john",
"age": "22",
"log": {
"record": [
{
"record": "1"
},
{
"record": "2"
}
]
}
},
{
"name": "lucy",
"age": "23",
"log": {
"record": [
{
"id": "1",
"event": "event1"
},
{
"id": "2",
"event": "event2"
}
]
}
}
]
},
"list2": {
"item": {
"name": "lily",
"age": "24"
}
}
}
}

  依赖

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        <!-- https://mvnrepository.com/artifact/org.dom4j/dom4j -->
        <dependency>
            <groupId>org.dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>2.1.4</version>
        </dependency>
 
        <!-- https://mvnrepository.com/artifact/com.alibaba.fastjson2/fastjson2 -->
        <dependency>
            <groupId>com.alibaba.fastjson2</groupId>
            <artifactId>fastjson2</artifactId>
            <version>2.0.42</version>
        </dependency>

  代码

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package org.longsheng.util;
 
import com.alibaba.fastjson2.JSONArray;
import com.alibaba.fastjson2.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
 
import java.util.ArrayList;
import java.util.List;
 
/**
* Xml转JSON工具包
*/
@Slf4j
public class XmlToJsonUtil {
    /**
     * 转换为json字符串
     *
     * @param xmlString xml字符串
     * @return json字符串
     */
    public static String toJsonString(String xmlString) {
        JSONObject result = toJson(xmlString);
        if (result == null) {
            return null;
        }
 
        return result.toString();
    }
 
    /**
     * 转换为json对象
     *
     * @param xmlString xml字符串
     * @return json对象
     */
    public static JSONObject toJson(String xmlString) {
        try {
            Document doc = DocumentHelper.parseText(xmlString);
            return toJson(doc);
        } catch (DocumentException e) {
            log.error("{}===>{}===>exception: {} | {}", Thread.currentThread().getStackTrace()[1].getClassName(), Thread.currentThread().getStackTrace()[1].getMethodName(), e.getMessage(), e.getStackTrace());
        }
 
        return null;
    }
 
    /**
     * 转换为json对象
     *
     * @param document xml对象
     * @return json对象
     */
    public static JSONObject toJson(Document document) {
        if (document == null) {
            return null;
        }
 
        try {
            Element root = document.getRootElement();
            List<Element> elements = root.elements();
 
            JSONObject jsonObject = new JSONObject();
            jsonObject.put(root.getName(), elementToJson(elements));
 
            return jsonObject;
        } catch (Exception e) {
            log.error("{}===>{}===>exception: {} | {}", Thread.currentThread().getStackTrace()[1].getClassName(), Thread.currentThread().getStackTrace()[1].getMethodName(), e.getMessage(), e.getStackTrace());
        }
 
        return null;
    }
 
    /**
     * 递归读取节点，并简单判定节点状态（值、对象、列表三种状态）
     *
     * @param elements
     * @return
     */
    public static JSONObject elementToJson(List<Element> elements) {
        if (elements == null || elements.isEmpty()) {
            return null;
        }
 
        JSONObject result = new JSONObject();
 
        // single object
        if (elements.size() == 1) {
            Element element = elements.get(0);
            List<Element> children = element.elements();
            result.put(element.getName(), children.isEmpty() ? element.getText() : elementToJson(children));
 
            return result;
        }
 
        // multi-object
        if (!elements.get(0).getName().equals(elements.get(1).getName())) {
            result.clear();
            List<Element> children;
 
            for (Element element : elements) {
                children = element.elements();
                result.put(element.getName(), children.isEmpty() ? element.getText() : elementToJson(children));
            }
 
            return result;
        }
 
        // array list
        List<JSONObject> jsonList = new ArrayList<>();
        List<Element> children;
        for (Element element : elements) {
            children = element.elements();
            result = new JSONObject();
 
            if (children.isEmpty()) {
                result.put(element.getName(), element.getText());
            } else {
                result = elementToJson(children);
            }
 
            jsonList.add(result);
        }
        result = new JSONObject();
        result.put(elements.get(0).getName(), jsonList);
        return result;
    }
 
    /**
     * 从json对象中获取指定名称的json数组
     *
     * @param jsonObject json对象
     * @param nodeName json数组节点名称
     * @return json数组
     */
    public static JSONArray getArray(JSONObject jsonObject, String nodeName) {
        if (jsonObject == null || nodeName == null || nodeName.isEmpty()) {
            return null;
        }
 
        Object node = jsonObject.get(nodeName);
        if (node == null) {
            return null;
        }
 
        JSONArray result = new JSONArray();
        if (node instanceof JSONObject) {
            result.add(node);
            return result;
        }
 
        if (node instanceof ArrayList) {
            result = jsonObject.getJSONArray(nodeName);
        }
 
        return result;
    }
 
    public static void main(String[] args) {
        String xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
                "<auibinsurancecallback>\n" +
                "\t<policyinfo>\n" +
                "\t\t<transtype>TKTS</transtype>\n" +
                "\t\t<eticketno>xxx</eticketno>\n" +
                "\t\t<flightnumber>xxx</flightnumber>\n" +
                "\t\t<flightdate>2019-10-16</flightdate>\n" +
                "\t\t<operatetime>2019-10-16 17:20:00</operatetime>\n" +
                "\t\t<insureno>1910161720056066735</insureno>\n" +
                "\t\t<agreeno>102160199</agreeno>\n" +
                "\t\t<policyno/>\n" +
                "\t\t<policyurl><![CDATA[]]></policyurl>\n" +
                "\t</policyinfo>\n" +
                "\t<returninfo>\n" +
                "\t\t<serialnumber>2019103015284949545354</serialnumber>\n" +
                "\t\t<retruncode>0</retruncode>\n" +
                "\t\t<errormessage><![CDATA[]]></errormessage>\n" +
                "\t</returninfo>\n" +
                "\t<list>\n" +
                "\t\t<item>" +
                "\t\t\t<name>john</name>" +
                "\t\t\t<age>22</age>" +
                "\t\t\t<log>" +
                "\t\t\t\t<record>1</record>" +
                "\t\t\t\t<record>2</record>" +
                "\t\t\t</log>" +
                "\t\t</item>\n" +
                "\t\t<item>" +
                "\t\t\t<name>lucy</name>" +
                "\t\t\t<age>23</age>" +
                "\t\t\t<log>" +
                "\t\t\t\t<record>" +
                "\t\t\t\t\t<id>1</id>" +
                "\t\t\t\t\t<event>event1</event>" +
                "\t\t\t\t</record>" +
                "\t\t\t\t<record>" +
                "\t\t\t\t\t<id>2</id>" +
                "\t\t\t\t\t<event>event2</event>" +
                "\t\t\t\t</record>" +
                "\t\t\t</log>" +
                "\t\t</item>\n" +
                "\t</list>\n" +
                "\t<list2>\n" +
                "\t\t<item>" +
                "\t\t\t<name>lily</name>" +
                "\t\t\t<age>24</age>" +
                "\t\t</item>\n" +
                "\t</list2>\n" +
                "</auibinsurancecallback>";
 
        JSONObject json = toJson(xml);
 
        System.out.println(xml);
        System.out.println();
        assert json != null;
        System.out.println(json.toJSONString());
 
        JSONArray array1 = getArray(json.getJSONObject("auibinsurancecallback").getJSONObject("list"), "item");
        JSONArray array2 = getArray(json.getJSONObject("auibinsurancecallback").getJSONObject("list2"), "item");
        System.out.println();
        System.out.println(array1.toJSONString());
        System.out.println(array2.toJSONString());
    }
}

 

龙生   24 Nov 2023
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QPS、TPS、并发用户数、吞吐量关系

1、QPS
QPS Queries Per Second 是每秒查询率 ,是一台服务器每秒能够相应的查询次数，是对一个特定的查询服务器在规定时间内所处理流量多少的衡量标准, 即每秒的响应请求数，也即是最大吞吐能力。

2、TPS
TPS Transactions Per Second 也就是事务数/秒。一个事务是指一个客户机向服务器发送请求然后服务器做出反应的过程。客户机在发送请求时开始计时，收到服务器响应后结束计时，以此来计算使用的时间和完成的事务个数，

龙生   21 Nov 2023
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Spring Boot 2.7.15集成Nacos 2.2.3

依赖

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// https://mvnrepository.com/artifact/com.alibaba.boot/nacos-config-spring-boot-starter
implementation group: 'com.alibaba.boot', name: 'nacos-config-spring-boot-starter', version: '0.2.12'

  配置文件 application.yml

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nacos:
  config:
    server-addr: 127.0.0.1:8848
    username: xxxx
    password: xxxxxx

  注解 @NacosPropertySource

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@SpringBootApplication
@MapperScan("com.w3cnet.xxx.repository")
@NacosPropertySource(dataId = "xxx-prod.yml", autoRefreshed = true)
public class XxxxApplication {
 
public static void main(String[] args) {
SpringApplication.run(XxxxApplication.class, args);
}
 
}

  注解 @NacosValue

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    @NacosValue(value = "${xxx.url}", autoRefreshed = true)
    private String xxxUrl;

  参考资料：https://nacos.io/zh-cn/docs/quick-start-spring-boot.html

龙生   12 Nov 2023
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nacos v2.2.1后docker启动脚本

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docker  run \
--name nacos -d \
-p 8848:8848 \
-p 9848:9848 \
-p 9849:9849 \
--privileged=true \
--restart=always \
-e JVM_XMS=256m \
-e JVM_XMX=256m \
-e MODE=standalone \
-e NACOS_AUTH_ENABLE=true \
-e NACOS_AUTH_TOKEN=n5zev798cgz0rn10andd85yrexre1u3f43gime523mrri7qc1pvwsxwipw1y \
-e NACOS_AUTH_IDENTITY_KEY=nacos \
-e NACOS_AUTH_IDENTITY_VALUE=xm4y03pc4lud5u0zu2tfpilkgqin6lwljlplcry893vtwdsw4a93r7f5nep3 \
-e PREFER_HOST_MODE=hostname \
-e SPRING_DATASOURCE_PLATFORM=mysql \
-e MYSQL_SERVICE_HOST=192.168.1.3 \
-e MYSQL_SERVICE_PORT=3306 \
-e MYSQL_SERVICE_USER=xxxx \
-e MYSQL_SERVICE_PASSWORD=xxxx \
-e MYSQL_SERVICE_DB_NAME=nacos_config \
-v /data/nacos/logs:/etc/nacos/logs \
-v /data/nacos/init.d/custom.properties:/etc/nacos/init.d/custom.properties \
nacos/nacos-server:latest

 

龙生   12 Nov 2023
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Docker Desktop 怎么改变最大内存

按下Windows + R 键，输入 %UserProfile% 并运行进入用户文件夹
新建文件 .wslconfig ，然后记事本编辑

[wsl2]
memory=4GB
processors=2
swap=0
localhostForwarding=true

龙生   11 Nov 2023
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C#与java通过RSA互相加解密，支持分段加解密，支持长文本，支持公钥加密私钥解密，私钥加密公钥解密

1、C#代码 C#采用的RSACryptoServiceProvider类进行的加解密，由于该类默认是不支持私钥加密公钥解密的，需要通过BouncyCastle.Crypto.dll转换一下才可以。 代码如下：

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using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using System.Xml;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.X509;
using Org.BouncyCastle.Asn1.X509;
namespace RSADemo
{
    /// <summary>
    /// RSA加解密帮助类
    /// 作者：代浩然
    /// 时间：2019-1-21 18:37
    /// </summary>
    public class RSAHelper
    {
        /// <summary>
        /// 生成公钥和私钥对
        /// </summary>
        public static void GeneratePublicAndPrivateKeyInfo()
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            using (StreamWriter writer = new StreamWriter("PrivateKey.xml"))  //这个文件要保密...
            {
                string privateKey = rsa.ToXmlString(true);
                writer.WriteLine(privateKey);
            }
            using (StreamWriter writer = new StreamWriter("PublicKey.xml"))
            {
                string publicKey = rsa.ToXmlString(false);
                writer.WriteLine(publicKey);
            }
        }
        /// <summary>
        /// 用私钥给数据进行RSA加密
        /// </summary>
        /// <param name="xmlPrivateKey"> 私钥(XML格式字符串)</param>
        /// <param name="strEncryptString">要加密的数据</param>
        /// <returns> 加密后的数据 </returns>
        public static string PrivateKeyEncrypt(string xmlPrivateKey, string strEncryptString)
        {
            //加载私钥
            RSACryptoServiceProvider privateRsa = new RSACryptoServiceProvider();
            privateRsa.FromXmlString(ReadFile(xmlPrivateKey));
            //转换密钥
            AsymmetricCipherKeyPair keyPair = DotNetUtilities.GetKeyPair(privateRsa);
            IBufferedCipher c = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding"); //使用RSA/ECB/PKCS1Padding格式
            //第一个参数为true表示加密，为false表示解密；第二个参数表示密钥
            c.Init(true, keyPair.Private);
            byte[] dataToEncrypt = Encoding.UTF8.GetBytes(strEncryptString);
            #region 分段加密
            int bufferSize = (privateRsa.KeySize / 8) - 11;
            byte[] buffer = new byte[bufferSize];
            byte[] outBytes = null;
            //分段加密
            using (MemoryStream input = new MemoryStream(dataToEncrypt))
            using (MemoryStream ouput = new MemoryStream())
            {
                while (true)
                {
                    int readLine = input.Read(buffer, 0, bufferSize);
                    if (readLine <= 0)
                    {
                        break;
                    }
                    byte[] temp = new byte[readLine];
                    Array.Copy(buffer, 0, temp, 0, readLine);
                    byte[] encrypt = c.DoFinal(temp);
                    ouput.Write(encrypt, 0, encrypt.Length);
                }
                outBytes = ouput.ToArray();
            }
            #endregion
            //byte[] outBytes = c.DoFinal(DataToEncrypt);//加密
            string strBase64 = Convert.ToBase64String(outBytes);
            return strBase64;
        }
        /// <summary>
        /// 用公钥给数据进行RSA解密
        /// </summary>
        /// <param name="xmlPublicKey"> 公钥(XML格式字符串) </param>
        /// <param name="strDecryptString"> 要解密数据 </param>
        /// <returns> 解密后的数据 </returns>
        public static string PublicKeyDecrypt(string xmlPublicKey, string strDecryptString)
        {
            //加载公钥
            RSACryptoServiceProvider publicRsa = new RSACryptoServiceProvider();
            publicRsa.FromXmlString(ReadFile(xmlPublicKey));
            RSAParameters rp = publicRsa.ExportParameters(false);
            //转换密钥
            AsymmetricKeyParameter pbk = DotNetUtilities.GetRsaPublicKey(rp);
            IBufferedCipher c = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding");
            //第一个参数为true表示加密，为false表示解密；第二个参数表示密钥
            c.Init(false, pbk);
            byte[] outBytes = null;
            byte[] dataToDecrypt = Convert.FromBase64String(strDecryptString);
            #region 分段解密
            int keySize = publicRsa.KeySize / 8;
            byte[] buffer = new byte[keySize];
            using (MemoryStream input = new MemoryStream(dataToDecrypt))
            using (MemoryStream output = new MemoryStream())
            {
                while (true)
                {
                    int readLine = input.Read(buffer, 0, keySize);
                    if (readLine <= 0)
                    {
                        break;
                    }
                    byte[] temp = new byte[readLine];
                    Array.Copy(buffer, 0, temp, 0, readLine);
                    byte[] decrypt = c.DoFinal(temp);
                    output.Write(decrypt, 0, decrypt.Length);
                }
                outBytes = output.ToArray();
            }
            #endregion
            //byte[] outBytes = c.DoFinal(DataToDecrypt);//解密
            string strDec = Encoding.UTF8.GetString(outBytes);
            return strDec;
        }
        /// <summary>
        /// 使用公钥加密，分段加密
        /// </summary>
        /// <param name="content"></param>
        /// <param name="privateKeyPath"></param>
        /// <returns></returns>
        public static string EncrytByPublic(string publicKeyPath, string strEncryptString)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(ReadFile(publicKeyPath));
            byte[] originalData = Encoding.UTF8.GetBytes(strEncryptString);
            if (originalData == null || originalData.Length <= 0)
            {
                throw new NotSupportedException();
            }
            if (rsa == null)
            {
                throw new ArgumentNullException();
            }
            byte[] encryContent = null;
            #region 分段加密
            int bufferSize = (rsa.KeySize / 8) - 11;
            byte[] buffer = new byte[bufferSize];
            //分段加密
            using (MemoryStream input = new MemoryStream(originalData))
            using (MemoryStream ouput = new MemoryStream())
            {
                while (true)
                {
                    int readLine = input.Read(buffer, 0, bufferSize);
                    if (readLine <= 0)
                    {
                        break;
                    }
                    byte[] temp = new byte[readLine];
                    Array.Copy(buffer, 0, temp, 0, readLine);
                    byte[] encrypt = rsa.Encrypt(temp, false);
                    ouput.Write(encrypt, 0, encrypt.Length);
                }
                encryContent = ouput.ToArray();
            }
            #endregion
            return Convert.ToBase64String(encryContent);
        }
        /// <summary>
        /// 通过私钥解密，分段解密
        /// </summary>
        /// <param name="content"></param>
        /// <param name="privateKeyPath"></param>
        /// <returns></returns>
        public static string DecryptByPrivate(string privateKeyPath, string strDecryptString)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(ReadFile(privateKeyPath));
            byte[] encryptData = Convert.FromBase64String(strDecryptString);
            //byte[] dencryContent = rsa.Decrypt(encryptData, false);
            byte[] dencryContent = null;
            #region 分段解密
            if (encryptData == null || encryptData.Length <= 0)
            {
                throw new NotSupportedException();
            }
            int keySize = rsa.KeySize / 8;
            byte[] buffer = new byte[keySize];
            using (MemoryStream input = new MemoryStream(encryptData))
            using (MemoryStream output = new MemoryStream())
            {
                while (true)
                {
                    int readLine = input.Read(buffer, 0, keySize);
                    if (readLine <= 0)
                    {
                        break;
                    }
                    byte[] temp = new byte[readLine];
                    Array.Copy(buffer, 0, temp, 0, readLine);
                    byte[] decrypt = rsa.Decrypt(temp, false);
                    output.Write(decrypt, 0, decrypt.Length);
                }
                dencryContent = output.ToArray();
            }
            #endregion
            return Encoding.UTF8.GetString(dencryContent);
        }
        /// <summary>
        /// 读取文件
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static string ReadFile(string filePath)
        {
            string content = "";
            if (File.Exists(filePath))
            {
                content = File.ReadAllText(filePath);
                byte[] mybyte = Encoding.UTF8.GetBytes(content);
                content = Encoding.UTF8.GetString(mybyte);
            }
            return content;
        }
        /// <summary>
        /// 将私钥转换成java所用的私钥字符串
        /// </summary>
        /// <param name="privateKeyPath">私钥文件路径</param>
        /// <returns></returns>
        public static string RSAPrivateKeyDotNet2Java(string privateKeyPath)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(ReadFile(privateKeyPath));
            BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
            BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
            BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));
            BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));
            BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));
            BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));
            BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));
            BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));
            RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);
            PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
            byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
            return Convert.ToBase64String(serializedPrivateBytes);    
        }
        /// <summary>
        /// 将公钥转换成java所用的公钥字符串
        /// </summary>
        /// <param name="publicKeyPath">公钥路径</param>
        /// <returns></returns>
        public static string RSAPublicKeyDotNet2Java(string publicKeyPath)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(ReadFile(publicKeyPath));
            BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
            BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
            RsaKeyParameters pub = new RsaKeyParameters(false, m, p);
            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
            byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
            return Convert.ToBase64String(serializedPublicBytes);
        }
    }
}

2、java端代码

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import java.io.*;
import java.util.Base64;
public class Base64Utils {
    /** *//**
     * 文件读取缓冲区大小
     */
    private static final int CACHE_SIZE = 1024;
    /** *//**
     * <p>
     * BASE64字符串解码为二进制数据
     * </p>
     *
     * @param base64
     * @return
     * @throws Exception
     */
    public static byte[] decode(String base64) throws Exception {
        //return Base64.decode(base64.getBytes());
        //Base64.getEncoder().encodeToString("在Java 8中,Base64编码已经成为Java类库的标准。".getBytes("utf-8"));
        return Base64.getDecoder().decode(base64);
    }
    /** *//**
     * <p>
     * 二进制数据编码为BASE64字符串
     * </p>
     *
     * @param bytes
     * @return
     * @throws Exception
     */
    public static String encode(byte[] bytes) throws Exception {
        //return new String(Base64.encode(bytes));
        return Base64.getEncoder().encodeToString(bytes);
    }
    /** *//**
     * <p>
     * 将文件编码为BASE64字符串
     * </p>
     * <p>
     * 大文件慎用，可能会导致内存溢出
     * </p>
     *
     * @param filePath 文件绝对路径
     * @return
     * @throws Exception
     */
    public static String encodeFile(String filePath) throws Exception {
        byte[] bytes = fileToByte(filePath);
        return encode(bytes);
    }
    /** *//**
     * <p>
     * BASE64字符串转回文件
     * </p>
     *
     * @param filePath 文件绝对路径
     * @param base64 编码字符串
     * @throws Exception
     */
    public static void decodeToFile(String filePath, String base64) throws Exception {
        byte[] bytes = decode(base64);
        byteArrayToFile(bytes, filePath);
    }
    /** *//**
     * <p>
     * 文件转换为二进制数组
     * </p>
     *
     * @param filePath 文件路径
     * @return
     * @throws Exception
     */
    public static byte[] fileToByte(String filePath) throws Exception {
        byte[] data = new byte[0];
        File file = new File(filePath);
        if (file.exists()) {
            FileInputStream in = null;
            ByteArrayOutputStream out = null;
            try{
                in = new FileInputStream(file);
                out = new ByteArrayOutputStream(2048);
                byte[] cache = new byte[CACHE_SIZE];
                int nRead = 0;
                while ((nRead = in.read(cache)) != -1) {
                    out.write(cache, 0, nRead);
                    out.flush();
                }
                data = out.toByteArray();
            }catch (Exception e){
                e.printStackTrace();
            }finally {
                if (in != null){
                    in.close();
                }
                if (out != null){
                    out.close();
                }
            }
        }
        return data;
    }
    /** *//**
     * <p>
     * 二进制数据写文件
     * </p>
     *
     * @param bytes 二进制数据
     * @param filePath 文件生成目录
     */
    public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
        InputStream in = null;
        OutputStream out = null;
        try{
            in = new ByteArrayInputStream(bytes);
            File destFile = new File(filePath);
            if (!destFile.getParentFile().exists()) {
                destFile.getParentFile().mkdirs();
            }
            destFile.createNewFile();
            out = new FileOutputStream(destFile);
            byte[] cache = new byte[CACHE_SIZE];
            int nRead = 0;
            while ((nRead = in.read(cache)) != -1) {
                out.write(cache, 0, nRead);
                out.flush();
            }
            out.close();
            in.close();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (in != null){
                in.close();
            }
            if (out != null){
                out.close();
            }
        }
    }
}

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import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.*;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
/**
* 非对称加密解密
*/
public class RSAEncryptProvider {
    /**
     * 加密算法RSA
     */
    public static final String KEY_ALGORITHM = "RSA";
    /**
     * 签名算法
     */
    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
    /**
     * 获取公钥的key
     */
    private static final String PUBLIC_KEY = "RSAPublicKey";
    /**
     * 获取私钥的key
     */
    private static final String PRIVATE_KEY = "RSAPrivateKey";
    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;
    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;
    /**
     * <p>
     * 生成密钥对(公钥和私钥)
     * </p>
     *
     * @return
     * @throws Exception
     */
    public static Map<String, Object> genKeyPair() throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        keyPairGen.initialize(1024);
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        Map<String, Object> keyMap = new HashMap<String, Object>(2);
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;
    }
    /**
     * <p>
     * 用私钥对信息生成数字签名
     * </p>
     *
     * @param msg 已加密数据
     * @param privateKey 私钥(BASE64编码)
     *
     * @return
     * @throws Exception
     */
    public static String sign(String msg, String privateKey) throws Exception {
        byte[] data = msg.getBytes();
        byte[] keyBytes = Base64.getDecoder().decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateK);
        signature.update(data);
        return Base64.getEncoder().encodeToString(signature.sign());
    }
    /**
     * <p>
     * 校验数字签名
     * </p>
     *
     * @param msg 已加密数据
     * @param publicKey 公钥(BASE64编码)
     * @param sign 数字签名
     *
     * @return
     * @throws Exception
     *
     */
    public static boolean verify(String msg, String publicKey, String sign)
            throws Exception {
        byte[] data = msg.getBytes();
        byte[] keyBytes = Base64.getDecoder().decode(publicKey);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PublicKey publicK = keyFactory.generatePublic(keySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initVerify(publicK);
        signature.update(data);
        return signature.verify(Base64.getDecoder().decode(sign));
    }
    /**
     * <P>
     * 私钥解密，进行分片解密，解密大文本
     * </p>
     *
     * @param encryptedDataStr 已加密数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPrivateKey(byte[] encryptedDataStr, String privateKey)
            throws Exception {
        //byte[] encryptedData = Base64.getDecoder().decode(encryptedDataStr);
        byte[] encryptedData = encryptedDataStr;
        byte[] keyBytes = Base64.getDecoder().decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, privateK);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        //return new String(decryptedData);
        return decryptedData;
    }
    /**
     * <p>
     * 公钥解密，进行分片解密，解密大文本
     * </p>
     *
     * @param encryptedDataStr 已加密数据
     * @param publicKey 公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPublicKey(byte[] encryptedDataStr, String publicKey)
            throws Exception {
        //byte[] encryptedData = Base64.getDecoder().decode(encryptedDataStr);
        byte[] encryptedData = encryptedDataStr;
        byte[] keyBytes = Base64.getDecoder().decode(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, publicK);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        //return new String(decryptedData);
        return decryptedData;
    }
    /**
     * <p>
     * 公钥加密，进行分片加密，加密大文本
     * </p>
     *
     * @param data 源数据
     * @param publicKey 公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPublicKey(byte[] data, String publicKey)
            throws Exception {
        byte[] keyBytes = Base64.getDecoder().decode(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        // 对数据加密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, publicK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        //String encryptedDataStr = Base64.getEncoder().encodeToString(encryptedData);
        return encryptedData;
    }
    /**
     * <p>
     * 私钥加密，进行分片加密，加密大文本
     * </p>
     *
     * @param data 源数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
            throws Exception {
        byte[] keyBytes = Base64.getDecoder().decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, privateK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        //String encryptedDataStr = Base64.getEncoder().encodeToString(encryptedData);
        return encryptedData;
    }
    /**
     * <p>
     * 获取私钥
     * </p>
     *
     * @param keyMap 密钥对
     * @return
     * @throws Exception
     */
    public static String getPrivateKey(Map<String, Object> keyMap)
            throws Exception {
        Key key = (Key) keyMap.get(PRIVATE_KEY);
        return Base64.getEncoder().encodeToString(key.getEncoded());
    }
    /**
     * <p>
     * 获取公钥
     * </p>
     *
     * @param keyMap 密钥对
     * @return
     * @throws Exception
     */
    public static String getPublicKey(Map<String, Object> keyMap)
            throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);
        return Base64.getEncoder().encodeToString(key.getEncoded());
    }
    /**
     * 通过C#的RSACryptoServiceProvider类产生的公钥进行转换成java的公钥
     * @param modulus
     * @param exponent
     * @return
     */
    public static PublicKey getPublicKey(String modulus, String exponent) {
        try {
            byte[] m = Base64Utils.decode(modulus);
            byte[] e = Base64Utils.decode(exponent);
            BigInteger b1 = new BigInteger(1,m);
            BigInteger b2 = new BigInteger(1,e);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            RSAPublicKeySpec keySpec = new RSAPublicKeySpec(b1, b2);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 通过C#的RSACryptoServiceProvider类产生的私钥进行转换成java的私钥
     * @param modulus
     * @param privateExponent
     * @return
     */
    public PrivateKey getPrivateKey(String modulus,String privateExponent) throws Exception {
        BigInteger m = new BigInteger(modulus);
        BigInteger e = new BigInteger(privateExponent);
        RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(m,e);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
    }
    public static void main(String[] args) throws Exception {
        //通过C#公钥文件转换的java公钥字符串
        String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCYyiJ5biYwnsRE2RgqI6rEsmxySuoxRAKBPkxZwBN2+NTb4KNr8JUtaD8Fj+NV1+eEspm8MT519PJRwCxOGxf/qU3CqCnTwxoc3MrN3MwxeQ1FC2wZkEm8y8FZKWd84udULxML+7ao1bCYWeDerd2MBWvKBpEqoG28jY3yY1AGbQIDAQAB";
        //通过C#私钥文件转换的java私钥字符串
        String privateKey = "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";
        //公钥加密
        String data = testPublicEncrypt("abc12345555555555554444444444" +
                "4444444444444444444444444444444444444" +
                "44444444444444444444444444444444444444" +
                "44444444444444444444444444444444444444" +
                "44444444444444444444444444444444444" +
                "444444444444444444444444444444444444" +
                "444444444444444444444444444444444444" +
                "555555555555555555555555555555555" +
                "5555555555555555555555555555555",publicKey);
        System.out.println(data);
        //私钥解密
        data = testPrivateDencrypt(data,privateKey);
        System.out.println(data);
        //私钥加密
        data = testPrivateEncrypt("abc12345555555555554444444444" +
                "4444444444444444444444444444444444444" +
                "44444444444444444444444444444444444444" +
                "44444444444444444444444444444444444444" +
                "44444444444444444444444444444444444" +
                "444444444444444444444444444444444444" +
                "444444444444444444444444444444444444" +
                "555555555555555555555555555555555" +
                "5555555555555555555555555555555",privateKey);
        System.out.println(data);
        //公钥解密
        data = testPublicDecrypt(data,publicKey);
        System.out.println(data);
    }
    /**
     * 测试公钥加密
     * @param content 要加密的字符串
     * @return
     * @throws Exception
     */
    private static String testPublicEncrypt(String content,String publicKey)throws Exception{
        byte[] entryData = RSAEncryptProvider.encryptByPublicKey(content.getBytes("UTF-8"), publicKey);
        return Base64Utils.encode(entryData);
    }
    /**
     * 测试私钥解密
     * @param content
     * @return
     * @throws Exception
     */
    private static String testPrivateDencrypt(String content,String privateKey)throws Exception{
        byte[] dentryData = RSAEncryptProvider.decryptByPrivateKey(Base64Utils.decode(content),privateKey);
        return new String(dentryData,"UTF-8");
    }
    /**
     * 测试通过私钥加密
     * @param content
     * @param privateKey
     * @return
     * @throws Exception
     */
    private static String testPrivateEncrypt(String content,String privateKey)throws Exception{
        byte[] entryData = RSAEncryptProvider.encryptByPrivateKey(content.getBytes("UTF-8"), privateKey);
        return Base64Utils.encode(entryData);
    }
    /**
     * 测试通过公钥解密
     * @param content
     * @param publicKey
     * @return
     * @throws Exception
     */
    private static String testPublicDecrypt(String content,String publicKey)throws Exception{
        byte[] dentryData = RSAEncryptProvider.decryptByPublicKey(Base64Utils.decode(content),publicKey);
        return new String(dentryData,"UTF-8");
    }
}

代码下载地址：https://download.csdn.net/download/lengyue2015/10930794   from:https://blog.csdn.net/lengyue2015/article/details/86582177

龙生   09 Nov 2023
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JDK动态代理(介绍理解，如何实现)

使用jdk的反射机制，创建对象的能力， 创建的是代理类的对象。 而不用你创建类文件。不用写java文件。
动态：在程序执行时，调用jdk提供的方法才能创建代理类的对象。

jdk动态代理，必须有接口，目标类必须实现接口， 没有接口时，需要使用cglib动态代理

龙生   08 Nov 2023
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Java动态代理之一CGLIB详解

CGLIB(Code Generation Library)是一个开源、高性能、高质量的Code生成类库（代码生成包）。

它可以在运行期扩展Java类与实现Java接口。Hibernate用它实现PO(Persistent Object 持久化对象)字节码的动态生成，Spring AOP用它提供方法的interception（拦截）。

CGLIB的底层是通过使用一个小而快的字节码处理框架ASM，来转换字节码并生成新的类。但不鼓励大家直接使用ASM框架，因为对底层技术要求比较高。

龙生   08 Nov 2023
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AspectJ入门

AOP的实现方式有两种：
AOP框架在编译阶段，就对目标类进行修改，得到的class文件已经是被修改过的。生成静态的AOP代理类（生成*.class文件已经被改掉了，需要使用特定的编译器）。以AspectJ为代表 —— 静态AOP框架。
AOP框架在运行阶段，动态生成AOP代理（在内存中动态地生成AOP代理类），以实现对目标对象的增强。它不需要特殊的编译器。以Spring AOP为代表。—— 动态AOP框架。

龙生   08 Nov 2023
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