java数字网站登录

java模拟网站登录

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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

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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){

l

System.out.printli(line);

line = br.readLine();

}

结束语：
????? 上面的代码基本就可以实现网站的登陆、信息获取的功能。看到登陆奇兵等软件卖的那么火，我们也做一个去吧!.

参考:
1.A recipe for cookie management
http://www.javaworld.com/javaworld/jw-04-2002/jw-0426-cookie.html

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