Java simulates cookie login operation

When using java to access a URL, if the URL requires authentication, you cannot access it directly because you are not logged in. So, how to solve this problem?

The method is to use java to simulate login, record the cookie information after login, and send the cookie to indicate identity when the next request is made, so that you can access the URL with permissions.

The following will first introduce the use of java to simulate login.

// 连接地址（通过阅读html源代码获得，即为登陆表单提交的URL）
 String surl = "http://login.goodjobs.cn/index.php/action/UserLogin";
 
 /**
  * 首先要和URL下的URLConnection对话。 URLConnection可以很容易的从URL得到。比如： // Using
  * java.net.URL and //java.net.URLConnection
  */
 URL url = new URL(surl);
 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 
 /**
  * 然后把连接设为输出模式。URLConnection通常作为输入来使用，比如下载一个Web页。
  * 通过把URLConnection设为输出，你可以把数据向你个Web页传送。下面是如何做：
  */
 connection.setDoOutput(true);
 /**
  * 最后，为了得到OutputStream，简单起见，把它约束在Writer并且放入POST信息中，例如： ...
  */
 OutputStreamWriter out = new OutputStreamWriter(connection
  .getOutputStream(), "GBK");
        //其中的memberName和password也是阅读html代码得知的，即为表单中对应的参数名称
 out.write("memberName=myMemberName&password=myPassword"); // post的关键所在！
 // remember to clean up
 out.flush();
 out.close();
 
 // 取得cookie，相当于记录了身份，供下次访问时使用
 String cookieVal = connection.getHeaderField("Set-Cookie");

After successful login, you can access other URLs.

String s = "http://user.goodjobs.cn/dispatcher.php/module/Resume/action/Preview";
//重新打开一个连接
       url = new URL(s);
HttpURLConnection resumeConnection = (HttpURLConnection) url
 .openConnection();
if (cookieVal != null) {
           //发送cookie信息上去，以表明自己的身份，否则会被认为没有权限
 resumeConnection.setRequestProperty("Cookie", cookieVal);
}
resumeConnection.connect();
InputStream urlStream = resumeConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(
 new InputStreamReader(urlStream));
String ss = null;
String total = "";
while ((ss = bufferedReader.readLine()) != null) {
 total += ss;
}
IOUtils.write(total, new FileOutputStream("d:/index.html"));
bufferedReader.close();

Through the above method, you can access URLs with permission control. The idea is: simulate login, obtain a cookie to record the identity, and send the cookie to indicate the identity on the next request.

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