使用httpclient模拟登陆操作，出现问题了，求帮助~~

lliu26 2014-03-27 08:41:37

想通过httpclient，做一个通过java代码登陆百度的功能。
参考了网上的多个版本，实现的原理差不多，但是有几个点我还是有点不清楚，比如：
1.如何确定request中需要传递的参数个数和每个参数名
2.第一次打开request，拿到location后，第二次发送请求，如何根据返回的response，判断是否登陆成功呢？（理论上，如果页面上包含我的用户名，应该就是成功了，但是我的返回值跟第一次访问返回的基本是一样的响应）。

麻烦大家帮忙看一下我的代码，要做如何修改？



import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;



import org.apache.http.Consts;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.cookie.Cookie;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;



public class BaiduLoginMain {

    public static void main(String[] args) {

        BaiduLoginUtil.process("username", "xxxxxxx");

    }

    

    public static boolean process(String username, String password) {

        boolean loginResult = false;



        DefaultHttpClient httpclient = new DefaultHttpClient();



        HttpResponse response;

        HttpEntity entity;



        List<Cookie> cookies;



        //组建登录的post包

        try {

            HttpPost httpPost = buildHttpPost(username, password);

            response = httpclient.execute(httpPost);



            entity = response.getEntity();

            System.out.println("Login form get: " + response.getStatusLine());

            EntityUtils.consume(entity);



            cookies = httpclient.getCookieStore().getCookies();

            if (cookies.isEmpty()) {

                System.out.println("None");

            } else {

                for (int i = 0; i < cookies.size(); i++) {

                    System.out.println("- " + cookies.get(i).toString());

                }

            }



            //进行页面跳转

            //这里本来应该获取response中的Location,但是返回结果里面没有这个数据，所以我临时指定了跳转页面地址

            String url = "http://www.baidu.com"; // 页面跳转

            HttpGet httpget1 = new HttpGet(url);

            response = httpclient.execute(httpget1);

            // 理论上，这里应该登陆成功了



            entity = response.getEntity();

            if (entity != null) {

                //do something...

            }

            // 显示结果

            BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(),

                "UTF-8"));

            String line = null;

            while ((line = reader.readLine()) != null) {

                System.out.println(line);

            }

        } catch (ClientProtocolException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            httpclient.getConnectionManager().shutdown();

        }



        return loginResult;

    }



    /**

     * 构建request

     * @param username

     * @param password

     */

    private static HttpPost buildHttpPost(String username, String password) {

        HttpPost httpPost;

        HttpClient httpclient = new DefaultHttpClient();

        httpPost = new HttpPost(

            "https://passport.baidu.com/v2/?login&tpl=mn&u=http://www.baidu.com/"); // 用户登录

        List<NameValuePair> nvps = new ArrayList<NameValuePair>();

        nvps.add(new BasicNameValuePair("TANGRAM__PSP_8__userName", username));

        nvps.add(new BasicNameValuePair("TANGRAM__PSP_8__password", password));



        httpPost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));



        httpPost.addHeader("Cache-control", "no-cache");

        httpPost.addHeader("Connection", "keep-alive");

        httpPost.addHeader("Content-Encoding", "gzip");

        httpPost.addHeader("Content-Language", "zh-CN");

        httpPost.addHeader("Content-Type", "text/html;charset=UTF-8");

        httpPost.addHeader("Server", "nginx");;



        return httpPost;

    }

}