java 模擬post登錄

這個要分兩步，先用GET方法取得頁面源碼，分析出mpc的值，然後用POST方法發送數據就能登錄了。當然壹切工作之前要設置好CookieHandler

post頁面：

/info_oper.php?tag=signin&pageref=

post參數就4個而已，

name=yourName&pwd=yourPassword&B12=Login&mpc=分析得到的mpc

看如下例子：

/question/141336096.html

將這個例子中的如下語句改壹下就能收到數據的

connection.getInputStream().close();

//

import java.io.BufferedInputStream;

import java.io.DataOutputStream;

import java.io.InputStream;

import java.net.CookieHandler;

import java.net.CookieManager;

import java.net.CookiePolicy;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class SongTaste {

private static String baseURL="";

private static String loginURL=baseURL+"/signin.php";

private static String actionURL=baseURL+"/info_oper.php?tag=signin&pageref=";

private static String musicURL=baseURL+"/music/";

private static CookieManager cm;

static{

cm=new CookieManager();

cm.setCookiePolicy(CookiePolicy.ACCEPT_ALL);

CookieHandler.setDefault(cm);

}

public static void main(String[] args) throws Exception{

// HttpURLConnection.setFollowRedirects(true);

login("abcmusic","000000");

listContents();

}

private static void listContents() throws Exception {

byte[] dat=new HttpGet(musicURL).data;

String src=new String(dat,"gbk");

Matcher m=Pattern.compile("MSL\\(.*?\\)").matcher(src);

while(m.find())

System.out.println(m.group());

}

private static void login(String name,String pwd){

byte[] dat=new HttpGet(loginURL).data;

String src=new String(dat);

Matcher m=Pattern.compile("name=mpc.*?>").matcher(src);

String mpc="";

if(m.find()){

mpc=m.group();

// System.out.println(mpc);

mpc=mpc.substring(15,mpc.length()-1);

// System.out.println(mpc);

}

//do login

new HttpPost(actionURL,String.format("name=%s&pwd=%s&B12=Login&mpc=%s",name,pwd,mpc));

}

private static class HttpGet extends Thread{

private static final int bufferSize=1024;

private String ustr;

private byte[] data;

private HttpGet(String u,String...ref){

ustr=u;

start();

try {join();} catch (Exception e) {}

}

public void run(){

try{

URL u = new URL(ustr);

HttpURLConnection uc=(HttpURLConnection)u.openConnection();

byte[] b={};

byte[] t=new byte[bufferSize];

int r;

BufferedInputStream bin=new BufferedInputStream(uc.getInputStream());

while((r=bin.read(t))>-1){

b=putData(b,t,r);

}

bin.close();

uc.disconnect();

data=b;

}catch(Exception e){}

}

private final byte[] putData(byte[] b, byte[] t, int r) {

byte[] tb=new byte[b.length+r];

System.arraycopy(b, 0, tb, 0, b.length);

System.arraycopy(t, 0, tb, b.length, r);

return tb;

}

}

private static class HttpPost extends Thread{

private static int blen=1024;

private static String contentType="application/x-www-form-urlencoded";

private String url,pms;

private byte[] dat={};

private HttpPost(String u,String p){

url=u;

pms=p;

start();

try{join();}catch(Exception e){}

}

public void run(){

try{

URL u = new URL(url);

HttpURLConnection connection=(HttpURLConnection)u.openConnection();

connection.setRequestMethod("POST");

connection.setRequestProperty("Content-Type",contentType);

connection.setRequestProperty("Content-Length",String.valueOf(pms.length()));

connection.setUseCaches(false);

connection.setDoOutput(true);

connection.setDoInput(true);

DataOutputStream dout=new DataOutputStream(connection.getOutputStream());

dout.write(pms.getBytes());

dout.flush();

dout.close();

InputStream in=connection.getInputStream();

BufferedInputStream bin=new BufferedInputStream(in);

byte[] buff=new byte[blen],bs={};

int r;

while((r=bin.read(buff))>-1){

bs=putData(bs,buff,r);

}

bin.close();

connection.disconnect();

dat=bs;

}catch(Exception e){}

}

private final byte[] putData(byte[] b, byte[] t, int r) {

byte[] tb=new byte[b.length+r];

System.arraycopy(b, 0, tb, 0, b.length);

System.arraycopy(t, 0, tb, b.length, r);

return tb;

}

}

}

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