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Category Archives: Backend

asp.net一个已实现的登陆过滤器

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Text.RegularExpressions;
 
namespace MyMook
{
    public class MyHttpModule : IHttpModule
    {
        public void Dispose()
        {
        }
 
        public void Init(HttpApplication application)
        {
            application.AcquireRequestState += new EventHandler(context_AcquireRequestState);
           // application.BeginRequest += new EventHandler(context_AcquireRequestState);
          //这里面要注意千万不要写成BeginRequest，那样就会无法获得session
        }
 
        void context_AcquireRequestState(Object source, EventArgs e)
        {
            HttpApplication application = (HttpApplication)source;
            HttpContext context = application.Context;
            string path=context.Request.Path;
            if (!context.Request.CurrentExecutionFilePathExtension.Equals(".aspx") && !context.Request.CurrentExecutionFilePathExtension.Equals(".ashx") ) {
                return;
            }//此处保证只过滤aspx/ashx/htm的请求
            Match m = Regex.Match(path,@"/WebLogin/+");
            if (m.Success) {
                return;
            }//不过滤文件夹WebLogin中的内容
            try
            {
                object user = context.Session["user"];
                if (user == null)
                {
                    context.Response.Redirect("~/WebLogin/Login.aspx");
                }
                else {
                    return;
                }
            }
            catch {
                context.Response.Redirect("~/WebLogin/Login.aspx");
            }
        }
 
        }
    }

在web.config中：

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<system.webServer>
    <modules>
      <add name="<span class="attribute-value">MyHttpModule"</span> <span class="attribute">type</span>=<span class="attribute-value">"MyMook.MyHttpModule,MyMook</span>"/>
    </modules>
  </system.webServer>

要点： 1.注册事件时，不要写application.BeginRequest，这样会导致无法获得Session.

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application.AcquireRequestState += new EventHandler(context_AcquireRequestState);
// application.BeginRequest += new EventHandler(context_AcquireRequestState);

  from:https://blog.csdn.net/touch_the_world/article/details/37936297

龙生   09 May 2018
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搜索引擎蜘蛛爬虫 User Agent 一览

今天分析研究了两个网站的 Apache 日志，分析日志虽然很无聊，但却是很有意义的事情，比如跟踪 SPAM 的 User Agent。顺便整理出一些搜索引擎爬虫的 User Agent，在这里分享一下，也欢迎补充。 微软 “msnbot-media/1.1 (+http://search.msn.com/msnbot.htm)” msnbot，大多数已经被bingbot替代了，现在偶尔还可以看到。 “Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)” bing，必应 搜搜 “Sosospider+(+http://help.soso.com/webspider.htm)” 腾讯搜搜 “Sosoimagespider+(+http://help.soso.com/soso-image-spider.htm)” 搜搜图片 雅虎 “Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)” 雅虎英文 “Yahoo! Slurp China” “Mozilla/5.0 (compatible; Yahoo! Slurp China; http://misc.yahoo.com.cn/help.html)” 雅虎中国 搜狗 “http://pic.sogou.com” “Sogou Pic Spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07)” 搜狗图片 “Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)” 搜狗，搜狗的蜘蛛程序做的很不好，总是进入死循环，已经分别在 robots.txt 和 设置中屏蔽掉 Google “Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)” Google “Googlebot-Image/1.0″ Google图片搜索 “Mediapartners-Google” 未知 “FeedBurner/1.0 (http://www.FeedBurner.com)” feedburner “AdsBot-Google-Mobile (+http://www.google.com/mobile/adsbot.html) Mozilla (iPhone; U; CPU iPhone OS 3 0 like Mac OS X) AppleWebKit (KHTML, like Gecko) Mobile Safari” Adwords移动网络 百度 “Baiduspider-image+(+http://www.baidu.com/search/spider.htm)” 百度图片 “Mozilla/5.0 […]

龙生   09 May 2018
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各大搜索引擎蜘蛛的UserAgent

GOOGLE ——————————————————————— 66.249.70.212 – – [11/Jan/2009:00:03:35 -0700] "GET www.vidun.com/user-f2fc990265c712c49d51a18a32b39f0c.html?umid=f2fc990265c712c49d51a18a32b39f0c HTTP/1.1" 200 8148 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" Referer: "" UserAgent: "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 66.249.70.212 – – [11/Jan/2009:03:27:23 -0700] "GET www.youxigao.com/images/pink/demo.gif HTTP/1.1" 200 2367 "-" "Googlebot-Image/1.0" Referer: "" UserAgent: "Googlebot-Image/1.0" 209.85.238.7 – – [11/Jan/2009:00:02:58 -0700] "GET www.youxigao.com/rss/c/1009 HTTP/1.1" 404 37 "-" "Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 10 subscribers; feed-id=8474979256887526569)" Referer: "" UserAgent: "Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 10 subscribers; feed-id=8474979256887526569)" 百度 ——————————————————————— 60.28.22.38 – – [11/Jan/2009:01:28:09 -0700] "GET www.vidun.com/vwsoft-vwantileechs-download.html?pr=vwantileechs&vi=download HTTP/1.1" 200 27406 "http://www.vidun.com/" "Baiduspider+(+http://www.baidu.com/search/spider.htm)" Referer: "" UserAgent: "Baiduspider+(+http://www.baidu.com/search/spider.htm)" YAHOO ——————————————————————— 202.160.180.81 – – [11/Jan/2009:00:02:44 -0700] […]

龙生   09 May 2018
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HtmlUnit爬取Ajax动态生成的网页以及自动调用页面javascript函数

HtmlUnit官网的介绍： HtmlUnit是一款基于Java的没有图形界面的浏览器程序。它模仿HTML document并且提供API让开发人员像是在一个正常的浏览器上操作一样，获取网页内容，填充表单，点击超链接等等。 它非常好的支持JavaScript并且仍在不断改进，同时能够解析非常复杂的AJAX库，通过不同的配置来模拟Chrome、Firefox和IE浏览器。 本文针对一个足彩网站抓取的例子，来熟悉HtmlUnit        WebClient wc = new WebClient(BrowserVersion.FIREFOX_38); wc.getOptions().setJavaScriptEnabled(true); //启用JS解释器，默认为true wc.setJavaScriptTimeout(100000);//设置JS执行的超时时间 wc.getOptions().setCssEnabled(false); //禁用css支持 wc.getOptions().setThrowExceptionOnScriptError(false); //js运行错误时，是否抛出异常 wc.getOptions().setTimeout(10000); //设置连接超时时间 ，这里是10S。如果为0，则无限期等待 wc.setAjaxController(new NicelyResynchronizingAjaxController());//设置支持AJAX wc.setWebConnection( new WebConnectionWrapper(wc) { public WebResponse getResponse(WebRequest request) throws IOException { …… } } ); HtmlPage page = wc.getPage("http://XXXX.com/"); FileWriter fileWriter = new FileWriter("D:\\text.html"); String str = ""; //获取页面的XML代码 str = page.asXml(); fileWriter.write( str ); //关闭webclient wc.close(); fileWriter.close(); 解决数据乱码问题 该网站数据是由js动态载入，并且js有2种编码： <script language="javascript" src="XXX.js" charset="gb2312"></script> <script language="javascript" src="XXX.js" charset="utf-8"></script> 可以通过重写WebConnectionWrapper类的getResponse方法来修改返回值 例如，对bfdata.js的返回结果做修改 wc.setWebConnection( new WebConnectionWrapper(wc) { public WebResponse getResponse(WebRequest request) throws IOException { WebResponse response = super.getResponse(request); if […]

龙生   09 May 2018
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springmvc中输出字符串

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/**
* 输出文字
* @param response
* @param s
*/
public static void responseOut(HttpServletResponse response,String s){
    response.setContentType("text/html;charset=UTF-8");
    response.setCharacterEncoding("UTF-8");
    try (
            PrintWriter pw = response.getWriter()
            ){
        pw.write(s);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

  from:https://www.cnblogs.com/yanqin/p/7463294.html

龙生   09 May 2018
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htmlunit模拟登录

PS:我只用到了这一句 webClient.getOptions().setThrowExceptionOnScriptError(false); htmlunit jar项目路径http://sourceforge.net/projects/htmlunit/files/htmlunit/ demo代码如下

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public class AutoLogin {
    /** 登录页面 */
    private static final String LOGIN_URL = "http://website/login.aspx";
    /** 任务列表页面 */
    private static final String TASK_LIST_URL = "http://website/Banli.aspx";
    
    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        testHomePage();
    }
    
    public static void testHomePage() throws Exception {
        final WebClient webClient = new WebClient(BrowserVersion.INTERNET_EXPLORER_8);
        webClient.getOptions().setThrowExceptionOnScriptError(false); //此行必须要加
        webClient.getOptions().setCssEnabled(false);
//      webClient.getOptions().setJavaScriptEnabled(true);
//      webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
        webClient.getOptions().setTimeout(300000);
        
        // 获取首页
        HtmlPage page = (HtmlPage) webClient.getPage(LOGIN_URL);
        // 根据form的名字获取页面表单，也可以通过索引来获取：page.getForms().get(0)
        final HtmlForm form = page.getFormByName("form1");
        
        // 用户名/密码
        HtmlTextInput textUserName = form.getInputByName("txtUserName");
        textUserName.setText("username");
        HtmlPasswordInput txtPwd = form.getInputByName("txtPwd");
        txtPwd.setText("pass");
        //调用JS触发登录按钮
        Page page1 = page.executeJavaScript("$('#btn').click()").getNewPage();
        
        page1 = webClient.getPage(TASK_LIST_URL);
        System.out.println("*************************************************************************************");
        System.out.println(page1.getWebResponse().getContentAsString());
        System.out.println("*************************************************************************************");
        System.out.println("");
        System.out.println("Cookies : " + webClient.getCookieManager().getCookies().toString());
    }
}

搞不清ASP.NET内部什么逻辑，试了很多方法都不行，查看了无所网站，无意中看到一个这个配置http://stackoverflow.com/questions/20352284/scraping-aspx-page-using-htmlunit

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import java.net.MalformedURLException;
 
import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlElement;
import com.gargoylesoftware.htmlunit.html.HtmlPage;
 
public class teste {
 
    public static void main(String args[]) throws FailingHttpStatusCodeException, MalformedURLException, IOException
    {
       HtmlPage page = null;
       String url = "http://www.bmfbovespa.com.br/cias-listadas/empresas-listadas/BuscaEmpresaListada.aspx?Idioma=pt-br";
 
       WebClient webClient = new WebClient(BrowserVersion.FIREFOX_17);
 
       webClient.getOptions().setThrowExceptionOnScriptError(false);
       webClient.getOptions().setCssEnabled(false);
       webClient.getOptions().setJavaScriptEnabled(false);
       webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
       webClient.getOptions().setTimeout(30000);
 
       page = webClient.getPage( url );
 
       System.out.println("Current page: Empresas Listadas | BM&FBOVESPA");
 
       HtmlElement theElement1 = (HtmlElement) page.getElementById("ctl00_contentPlaceHolderConteudo_BuscaNomeEmpresa1_btnTodas");
       page = theElement1.click();
 
       System.out.println(page.asText());
 
       System.out.println("Test has completed successfully");
    }
 
}

最后测试下来，如果不加 webClient.getOptions().setThrowExceptionOnScriptError(false);就一直报这个错误

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Exception in thread "main" ======= EXCEPTION START ========
Exception class=[java.lang.RuntimeException]
com.gargoylesoftware.htmlunit.ScriptException: Exception invoking click
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:954)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:836)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:812)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:800)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:910)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScript(HtmlPage.java:878)
    at com.suypower.AutoLogin12345.testHomePage(AutoLogin12345.java:48)
    at com.suypower.AutoLogin12345.main(AutoLogin12345.java:23)
Caused by: java.lang.RuntimeException: Exception invoking click
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:181)
    at net.sourceforge.htmlunit.corejs.javascript.FunctionObject.call(FunctionObject.java:449)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1536)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:411)
    at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3286)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:827)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:939)
    ... 9 more
Caused by: com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot read property "nodeName" from null (http://xxxx/305000772#7)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:954)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:836)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:812)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:800)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:910)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:354)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:415)
    at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:271)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:293)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:799)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:756)
    at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
    at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
    at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
    at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3126)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2093)
    at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:920)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:1039)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:252)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:198)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:271)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:159)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:478)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:352)
    at com.gargoylesoftware.htmlunit.html.BaseFrameElement.loadInnerPageIfPossible(BaseFrameElement.java:183)
    at com.gargoylesoftware.htmlunit.html.BaseFrameElement.loadInnerPage(BaseFrameElement.java:121)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.loadFrames(HtmlPage.java:1893)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.initialize(HtmlPage.java:227)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:485)
    at com.gargoylesoftware.htmlunit.WebClient.loadDownloadedResponses(WebClient.java:2135)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:982)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.processPostponedActions(JavaScriptEngine.java:1072)
    at com.gargoylesoftware.htmlunit.html.DomElement.click(DomElement.java:789)
    at com.gargoylesoftware.htmlunit.html.HtmlImageInput.click(HtmlImageInput.java:152)
    at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLInputElement.click(HTMLInputElement.java:477)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:153)
    ... 19 more
Caused by: net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot read property "nodeName" from null (http://xxxx/305000772#7)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3935)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3919)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3944)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3960)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.undefReadError(ScriptRuntime.java:3971)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1519)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1243)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:118)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:827)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:939)
    ... 65 more
Enclosed exception:
java.lang.RuntimeException: Exception invoking click
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:181)
    at net.sourceforge.htmlunit.corejs.javascript.FunctionObject.call(FunctionObject.java:449)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1536)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:411)
    at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3286)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:827)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:939)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:836)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:812)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:800)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:910)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScript(HtmlPage.java:878)
    at com.suypower.AutoLogin12345.testHomePage(AutoLogin12345.java:48)
    at com.suypower.AutoLogin12345.main(AutoLogin12345.java:23)
Caused by: com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot read property "nodeName" from null (http://xxx/305000772#7)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:954)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:836)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:812)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:800)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:910)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:354)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:415)
    at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:271)
    at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:293)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:799)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:756)
    at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
    at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
    at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
    at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3126)
    at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2093)
    at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:920)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:1039)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:252)
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:198)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:271)
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:159)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:478)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:352)
    at com.gargoylesoftware.htmlunit.html.BaseFrameElement.loadInnerPageIfPossible(BaseFrameElement.java:183)
    at com.gargoylesoftware.htmlunit.html.BaseFrameElement.loadInnerPage(BaseFrameElement.java:121)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.loadFrames(HtmlPage.java:1893)
    at com.gargoylesoftware.htmlunit.html.HtmlPage.initialize(HtmlPage.java:227)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:485)
    at com.gargoylesoftware.htmlunit.WebClient.loadDownloadedResponses(WebClient.java:2135)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:982)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.processPostponedActions(JavaScriptEngine.java:1072)
    at com.gargoylesoftware.htmlunit.html.DomElement.click(DomElement.java:789)
    at com.gargoylesoftware.htmlunit.html.HtmlImageInput.click(HtmlImageInput.java:152)
    at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLInputElement.click(HTMLInputElement.java:477)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:153)
    ... 19 more
Caused by: net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot read property "nodeName" from null (http://xxx/305000772#7)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3935)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3919)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3944)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3960)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.undefReadError(ScriptRuntime.java:3971)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1519)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1243)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:118)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:827)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:939)
    ... 65 more
======= EXCEPTION END ========

希望能帮助到你，晚安！   from:https://www.cnblogs.com/yimu/p/LOVE_HCJ.html

龙生   09 May 2018
View Details

模拟浏览器的神器 – HtmlUnit

PS:下面这个低本息我测试成功了，高版本怎么试都有问题。   随着Web的发展，RIA越来越多，JavaScript和Complex AJAX Libraries给网络爬虫带来了极大的挑战，解析页面的时候需要模拟浏览器执行JavaScript才能获得需要的文本内容。   好在有一个Java开源项目HtmlUnit，它能模拟Firefox、IE、Chrome等浏览器，不但可以用来测试Web应用，还可以用来解析包含JS的页面以提取信息。   下面看看HtmlUnit的效果如何：   首先，建立一个maven工程，引入junit依赖和HtmlUnit依赖：

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<dependency>  
    <groupId>junit</groupId>  
    <artifactId>junit</artifactId>  
    <version>4.8.2</version>  
    <scope>test</scope>  
</dependency>  
<dependency>  
    <groupId>net.sourceforge.htmlunit</groupId>  
    <artifactId>htmlunit</artifactId>  
    <version>2.14</version>  
</dependency>

其次，写一个junit单元测试来使用HtmlUnit提取页面信息：

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/**
* 使用HtmlUnit模拟浏览器执行JS来获取网页内容
* @author 杨尚川
*/
public class HtmlUnitTest {
    @Test
    public void homePage() throws Exception {
        final WebClient webClient = new WebClient(BrowserVersion.INTERNET_EXPLORER_11);
        final HtmlPage page = webClient.getPage("http://yangshangchuan.iteye.com");
        Assert.assertEquals("杨尚川的博客 - ITeye技术网站", page.getTitleText());
        final String pageAsXml = page.asXml();
        Assert.assertTrue(pageAsXml.contains("杨尚川，系统架构设计师，系统分析师，2013年度优秀开源项目APDPlat发起人，资深Nutch搜索引擎专家。多年专业的软件研发经验，从事过管理信息系统(MIS)开发、移动智能终端(Win CE、Android、Java ME)开发、搜索引擎(nutch、lucene、solr、elasticsearch)开发、大数据分析处理(Hadoop、Hbase、Pig、Hive)等工作。目前为独立咨询顾问，专注于大数据、搜索引擎等相关技术，为客户提供Nutch、Lucene、Hadoop、Solr、ElasticSearch、HBase、Pig、Hive、Gora等框架的解决方案、技术支持、技术咨询以及培训等服务。"));
        final String pageAsText = page.asText();
        Assert.assertTrue(pageAsText.contains("[置顶] 国内首套免费的《Nutch相关框架视频教程》(1-20)"));
        webClient.closeAllWindows();
    }
    @Test
    public void homePage_Firefox() throws Exception {
        final WebClient webClient = new WebClient(BrowserVersion.FIREFOX_24);
        final HtmlPage page = webClient.getPage("http://yangshangchuan.iteye.com");        
        Assert.assertEquals("杨尚川的博客 - ITeye技术网站", page.getTitleText());
        webClient.closeAllWindows();
    }
    @Test
    public void getElements() throws Exception {
        final WebClient webClient = new WebClient(BrowserVersion.CHROME);
        final HtmlPage page = webClient.getPage("http://yangshangchuan.iteye.com");
        final HtmlDivision div = page.getHtmlElementById("blog_actions");
        //获取子元素
        Iterator<DomElement> iter = div.getChildElements().iterator();
        while(iter.hasNext()){
            System.out.println(iter.next().getTextContent());
        }
        //获取所有输出链接
        for(HtmlAnchor anchor : page.getAnchors()){
            System.out.println(anchor.getTextContent()+" : "+anchor.getAttribute("href"));
        }
        webClient.closeAllWindows();
    }
    @Test
    public void xpath() throws Exception {
        final WebClient webClient = new WebClient();
        final HtmlPage page = webClient.getPage("http://yangshangchuan.iteye.com");
        //获取所有博文标题
        final List<HtmlAnchor> titles = (List<HtmlAnchor>)page.getByXPath("/html/body/div[2]/div[2]/div/div[16]/div/h3/a");
        for(HtmlAnchor title : titles){
            System.out.println(title.getTextContent()+" : "+title.getAttribute("href"));
        }
        //获取博主信息
        final HtmlDivision div = (HtmlDivision) page.getByXPath("//div[@id='blog_owner_name']").get(0);
        System.out.println(div.getTextContent());
        webClient.closeAllWindows();
    }
    @Test
    public void submittingForm() throws Exception {
        final WebClient webClient = new WebClient(BrowserVersion.FIREFOX_24);
        final HtmlPage page = webClient.getPage("http://www.oschina.net");
        // Form没有name和id属性
        final HtmlForm form = page.getForms().get(0);
        final HtmlTextInput textField = form.getInputByName("q");
        final HtmlButton button = form.getButtonByName("");
        textField.setValueAttribute("APDPlat");
        final HtmlPage resultPage = button.click();
        final String pageAsText = resultPage.asText();
        Assert.assertTrue(pageAsText.contains("找到约"));
        Assert.assertTrue(pageAsText.contains("条结果"));        
        webClient.closeAllWindows();
    }
}

最后，我们运行单元测试， 全部通过测试！   from:http://yangshangchuan.iteye.com/blog/2036809

龙生   09 May 2018
View Details

一步一步学EF系列【6、IOC 之AutoFac】

前言 之前的前5篇作为EF方面的基础篇，后面我们将使用MVC+EF 并且使用IOC ,Repository，UnitOfWork，DbContext来整体来学习。因为后面要用到IOC，所以本篇先单独先学习一下IOC，我们本本文单独主要学习Autofac，其实对于Autofac我也是边学边记录。不对的地方，也希望大家多多指导。 个人在学习过程中参考博客： AutoFac文档：http://www.cnblogs.com/wolegequ/archive/2012/06/09/2543487.html AutoFac使用方法总结:Part I：http://niuyi.github.io/blog/2012/04/06/autofac-by-unit-test/ 为什么使用AutoFac？ Autofac是.NET领域最为流行的IOC框架之一，传说是速度最快的一个： 优点： 它是C#语言联系很紧密，也就是说C#里的很多编程方式都可以为Autofac使用，例如可以用Lambda表达式注册组件 较低的学习曲线，学习它非常的简单，只要你理解了IoC和DI的概念以及在何时需要使用它们 XML配置支持 自动装配 与Asp.Net MVC 集成 微软的Orchad开源程序使用的就是Autofac，从该源码可以看出它的方便和强大 上面的优点我也是拷的别人文章里面的，上面的这个几乎所有讲Autofac博文都会出现的。这个也是首次学习，所以我们还是记录的细一点。 怎么使用Autofac 通过VS中的NuGet来加载AutoFac,引入成功后引用就会出现Autofac。 1、我们做一个简单的例子先用一下 就拿数据访问来做案例把，一个数据请求有两个类，一个是Oracle 一个是SQLSERVER。我们在使用的时候可以选择调用那个数据库。 1.1 我们先定义一个数据访问的接口和访问类。

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/// <summary>
    /// 数据源操作接口
    /// </summary>
    public interface IDataSource
    {
        /// <summary>
        /// 获取数据
        /// </summary>
        /// <returns></returns>
        string GetData();
    }

 

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/// <summary>
    /// SQLSERVER数据库
    /// </summary>
    class Sqlserver : IDataSource
    {
        public string GetData()
        {
            return "通过SQLSERVER获取数据";
        }
    }

 

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/// <summary>
    /// ORACLE数据库
    /// </summary>
    public class Oracle : IDataSource
    {
        public string GetData()
        {
            return "通过Oracle获取数据";
        }
    }

  最普通的方式大家都会的吧！ 如果最普通的方式调用SQLSERVER怎么写？

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static void Main(string[] args)
        {
            IDataSource ds = new Sqlserver();
 
            Console.WriteLine(ds.GetData());
 
            Console.ReadLine();
        }

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调用Oracle的话new Oracle（）就可以了。如果这个都不能理解的话，那学习这个你就很费劲了。

  改进一下代码。我们在加入一个DataSourceManager类来看一下

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/// <summary>
/// 数据源管理类
/// </summary
public class DataSourceManager
    {
 
        IDataSource _ds;
        /// <summary>
        /// 根据传入的类型动态创建对象
        /// </summary>
        /// <param name="ds"></param>
        public DataSourceManager(IDataSource ds)
        {
            _ds = ds;
        }
 
        public string GetData()
        {
            return _ds.GetData();
        }
    }

这样写的好处是什么，这样加入加入新的数据源，只用调用的时候传入这个对象就可以，就会自动创建一个对应的对象。那接下如果要调用SQLSERVER怎么写。看代码

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DataSourceManager dsm = new DataSourceManager(new Sqlserver());
Console.WriteLine(dsm.GetData());
 
Console.ReadLine();

1.2 注入实现构造函数注入 上面的DataSourceManager的动态创建的方式就是因为又有个带IDataSource的参数的构造函数，只要调用者传入实现该接口的对象，就实现了对象创建。 那我们看看怎么使用AutoFac注入实现构造函数注入

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var builder = new ContainerBuilder();
            builder.RegisterType&lt;DataSourceManager&gt;();
            builder.RegisterType&lt;Sqlserver&gt;().As&lt;IDataSource&gt;();
 
            using (var container = builder.Build())
            {
                var manager = container.Resolve&lt;DataSourceManager&gt;();
                Console.WriteLine(manager.GetData());
 
                Console.ReadLine();
            }

  上面的就是AutoFac构造函数注入，他给IDataSource注入的是Sqlserver所以我们调用的数据，返回的就是Sqlserver数据。那下面我们具体的了解一下AutoFac的一些方法 1.3 Autofac方法说明

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（1）builder.RegisterType&lt;Object&gt;().As&lt;Iobject&gt;()：注册类型及其实例。例如上面就是注册接口IDataSource的实例Sqlserver

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（2）IContainer.Resolve&lt;IDAL&gt;()：解析某个接口的实例。例如一下代码，我可以解析接口返回的就是Sqlserver实例

var builder = new ContainerBuilder(); //builder.RegisterType<DataSourceManager>(); builder.RegisterType<Sqlserver>().As<IDataSource>(); using (var container = builder.Build()) { var manager = container.Resolve<IDataSource>(); Console.WriteLine(manager.GetData()); Console.ReadLine(); }

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（3）builder.RegisterType&lt;Object&gt;().Named&lt;Iobject&gt;(string name)：为一个接口注册不同的实例。有时候难免会碰到多个类映射同一个接口，比如Sqlerver和Oracle都实现了IDalSource接口，为了准确获取想要的类型，就必须在注册时起名字。

1 2 3 4 5 6 7 8 var builder = new ContainerBuilder(); builder.RegisterType<Sqlserver>().Named<IDataSource>("SqlServer"); builder.RegisterType<Oracle>().Named<IDataSource>("Oracel"); using (var container = […]

龙生   03 May 2018
View Details

SQLServer与C#数据类型对照

龙生   02 May 2018
View Details

php开启与关闭错误提示详解

在php中开启与关闭错误提示的方法有几种一种可以直接在程序中使用相关函数来开户，另一种我们可以使用php.ini中配置参数来控制，下面小编来给各位同学介绍一下。 windows系统开关php错误提示 如果不具备修改php.ini的权限，可以将如下代码加入php文件中：

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ini_set("display_errors", "On");
error_reporting(E_ALL | E_STRICT);

  当然，如果能够修改php.ini的话，如下即可：

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找到display_errors = On 修改为 display_errors = off
注意:如果你已经把PHP.ini文件复制到windows目录下,那么必须同时把c:windows/php.ini里的display_errors = On 修改为display_errors = off
PHP .ini中display_errors = Off失效的解决

  在linux系统中开启与关闭错误提示方法差不多，不过我还是具体给大家介绍一下 linux系统下 1. 打开php.ini文件。 以我的ubuntu为例，这个文件在： /etc/php5/apache2 目录下。 2. 搜索并修改上下行，把Off值改成On

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display_errors = Off

  3. 搜索下行

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error_reporting = E_ALL & ~E_NOTICE
或者搜索：
error_reporting = E_ALL & ~E_DEPRECATED
修改为
error_reporting = E_ALL | E_STRICT

  4. 修改Apache的 httpd.conf， 以Ubuntu 为例， 这个文件在：/etc/apache2/ 目录下，这是一个空白文件。 添加以下两行：

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php_flag display_errors        on
php_value error_reporting       2039

  5. 重启Apache，就OK了。 重启命令： ：

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sudo /etc/init.d/apache2 restart

  在php中静态方法我们就直接在函数或变量前加一个static就可以了，使用的时候和静态变量差不多，不需要实例化，直接用::调用了，下面我来给大家举几个关于静态方法实例。 PHP也不例外！所谓静态方法（属性）就是以static关键词标注的属性或者方法（例如：静态属性public static username;） 静态方法和非静态方法最大的区别在于他们的生命周期不同，用一个实例来说明 静态方法定义 定义静态方法很简单，在声明关键词function之前加上static，例如：

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class A
{
    static function fun()
    {
        // do somathing
    }
}

  静态方法使用 使用的时候和静态变量差不多，不需要实例化，直接用::调用，例如：

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A::fun()

  对比普通方法 因为静态方法的调用不需要实例化，所以在静态方法中引用类自身的属性或者方法的时候会出错，也就是形如self和$this是错误的。

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class MyClass
{
    public $num = 5;
    function __construct()
    {
        $this->num = 10;
    }
    function fun_1()
    {
        echo "I am a public method named fun_1.n";
        echo "The num of object is {$this->num}.n";
    }
    static function fun_2()
    {
        echo "I am a static method named fun_2.n";
    }
    function fun_3($n)
    {
        echo "The arg is {$n}n";
    }
}
$m = new MyClass;
$m->fun_1();
$m->fun_2();
$m->fun_3('test');
MyClass::fun_1();
MyClass::fun_2();
MyClass::fun_3('test');
输出结果：
lch@localhost:php $ php class_method.php
I am a public method named fun_1.
The num of object is 10.
I am a static method named fun_2.
The arg is test
I am a public method named fun_1.
PHP Fatal error:  Using $this when not in object context in /Users/lch/program/php/class_method.php on line 14

  再看一实例 用一个实例来说明。

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class user{
public static $username;   //声明一个静态属性
public $password;     //声明一个非静态属性
function __construct($pwd) {
  echo ‘Username:’,self::$username;   //输出静态属性
  self::$username = ‘admin’;  //为静态属性赋值
  $this->password = $pwd;   //为非静态属性赋值
}
public function show(){    //输出类属性
  echo ‘
Username:’,self::$username;
  echo ‘
Password:’,$this->password;
}
public static function sshow(){
  echo ‘
Username:’,self::$username;
  echo ‘
Password:’,$this->password;
}
}
user::$username = ‘root’;    //为赋值user类的静态属性赋值
$objUser = new user(’123456′);     //实例化user类
$objUser->sshow();
unset($objUser);
echo ‘
Username:’,user::$username;
/*
* 输出结果为：
* Username:root
* Username:admin
* Password:123456
* Usern
ame:admin
* */

  从这里实例中可以看出，静态属性在类实例化以前就起作用了，并且在对象被销毁时静态属性依然可以发挥作用！ 也因为静态方法的这种属性，所以不能在静态方法中调用非静态属性或者方法 接着看 1、php类中，假设所有的属性与方法的可见性为public，那么在外部访问类的方法或属性时，都必须通过对象【类的实例化过程】来调用。 eg：

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class Log
{
    public $root = DIRECTORY_SEPARATOR;
    public $logPath = '/data/app/www/test-realtime.monitoring.c.kunlun.com/log';
    public $defaultDir = 'default';
    
    public function writeLog($logName, $logType, $data, $newDir = FALSE)
    {
        $fileName = '';
        
        if (!file_exists($this->logPath))
        {
            mkdir($this->logPath, 0777);
        }
        
        if ($newDir !== FALSE)
        {
            @mkdir($this->logPath.$this->root.$newDir, 0777);
            $fileName = $this->logPath.$this->root.$newDir.$this->root.date('Y-m-d', time()).'_'.$logName.'_'.$logType.'.log';
        }
        else
        {
            @mkdir($this->logPath.$this->root.$this->defaultDir, 0777);
            $fileName = $this->logPath.$this->root.$this->defaultDir.$this->root.date('Y-m-d', time()).'_'.$logName.'_'.$logType.'.log';
        }
        
        file_put_contents($fileName, date('Y-m-d H:i:s').' '.$data."n", FILE_APPEND);
    }
}

  类的实例化对象的过程：$logObj = new Log(); 访问类中的方法：$logObj->writeLog($param1, $param2, $param3, $param4); 访问类中的属性：echo $logObj->root; 2、如果类中的属性前被static关键字修饰时，就不能通过对象来访问被static修饰的属性，但如果是类中的方法被static修饰时则即可以通过对象也可以通过类名：：方法名的方式来进行访问。 3、如果类中的方法被static修饰则，方法中不能用$this，$this指的是类的实例化对象，由于静态方法不用通过对象就可以调用，所以伪变量$this不可用。 魔术方法是在php5中以__开头的，它们有着魔术般的功能，可以给我开发带来很多好处，下面我来给大家介绍魔术方法一些用法与在php中有那些魔术方法吧。 魔术方法是以两个下划线"__"开头、具有特殊作用的一些方法，可以看做php的"语法糖"。 语法糖指那些没有给计算机语言添加新功能，而只是对人类来说更"甜蜜"的语法。语法糖往往给程序员提供了更实用的编程方式或者一些技巧的用法，有益于更好的编码风格，是代码更易读。不过其并没有给语言添加什么新东西。php里的引用、SPL等都属于语法糖。

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$tom = new family($student,'peking');
$tom = people->say();

  上面family类中的construct方法就是一个标准魔术方法。这个魔术方法又称构造方法。有构造方法就有对应的西沟方法，即destruct方法,西沟方法会在某个对象的所有引用都被删除，或者当对象被显式销毁时执行。这两个方法是常见也是最游泳的魔术方法。 1、__get、__set 这两个方法是为在类和他们的父类中没有声明的属性而设计的。 ◆__get( […]

龙生   30 Apr 2018
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