Java模拟网站登录

 web登陆无非就是网页获取，cookie 的管理，post和get方式的模拟。

 1.网页内容获取 java.io.InputStream   in;
 java.net.URL url = new java.net.URL(www.xyz.com/content.html);
 java.net.HttpURLConnection connection = (java.net.HttpURLConnection)
 url.openConnection();
 connection = (java.net.HttpURLConnection) url.openConnection();
 //模拟成IE
 connection.setRequestProperty(“User-Agent”,”Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)”);
 connection.connect();
 in = connection.getInputStream();
 java.io.BufferedReader breader =
 new BufferedReader(new InputStreamReader(in , “GBK”));
 String str=breader.readLine());
 while(st != null){
 System.out.println(str); str=breader.readLine());
 }
 2.cookie管理
 1.直接的方式
 取得cookie：
 HttpURLConnection huc= (HttpURLConnection) url.openConnection();
 InputStream is = huc.getInputStream();
 // 取得sessionID.
 String cookieVal = hc.getHeaderField(“Set-Cookie”);
 String sessionId;
 if(cookieVal != null)
 {
 sessionId = cookieVal.substring(0, cookieVal.indexOf(“;”));
 }
 发送设置cookie：
 HttpURLConnection huc= (HttpURLConnection) url.openConnection();
 if(sessionId != null)
 {
 huc.setRequestProperty(“Cookie”, sessionId);
 }
 InputStream is = huc.getInputStream();

 2.利用的jcookie包(http://jcookie.sourceforge.net/ )
 获取cookie:
 URL url = new URL(“http://www.site.com/”);
 HttpURLConnection huc = (HttpURLConnection) url.openConnection();
 huc.connect();
 InputStream is = huc.getInputStream();
 Client client = new Client();
 CookieJar cj = client.getCookies(huc);

 新的请求,利用上面获取的cookie:
 url = new URL(“http://www.site.com/”);
 huc = (HttpURLConnection) url.openConnection();
 client.setCookies(huc, cj);

 3.post方式的模拟
 URL url = new URL(“www.xyz.com”);
 HttpURLConnection huc = (HttpURLConnection) url.openConnection();
 //设置允许output
 huc.setDoOutput(true);
 //设置为post方式
 huc.setRequestMethod(“POST”);
 huc.setRequestProperty(“User-Agent”,”Mozilla/4.7 [en] (Win98; I)”);
 StringBuffer sb = new StringBuffer();
 sb.append(“userName=”+userNme);
 sb.append(“&password=”+password);

 //post信息
 OutputStream os = huc.getOutputStream();
 os.write(sb.toString().getBytes(“GBK”));
 os.close();

 BufferedReader br = new BufferedReader(new InputStreamReader(huc.getInputStream()))
 huc.connect();
 String line = br.readLine();
 while(line != null){
 System.out.printli(line);
 line = br.readLine();
 }