HttpClient，实现登录，请求等操作，session保持

HttpClient，httpclient.jar包中的，我则喜欢折射成类似于dll以用的形式，知道在哪个namespace下

http://hc.apache.org/httpcomponents-client

可以从这里获取或得到些信息

实现的目标：

1.模拟登录

2.登录之后，模拟提交请求

 

关键点：

1.session状态保持

2.页面隐藏的属性获取

之前用HttpURLConnection，但未成功，瓶颈在于没有绕过session保持上，最终还是使用HttpClient，实现相对容易些

 

示例代码

（代码有删减，不见得能够跑通，需要修改）

 

/** *  */package httpclienttest;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Random;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.ResponseHandler;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.BasicResponseHandler;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HTTP;import com.alibaba.ccbu.parseelements.ParseTest;/** * @author forward *  */public class LoginFormDemo {     public static void DemoLoginTwo() throws Exception {        DefaultHttpClient httpclient = new DefaultHttpClient();        HttpGet httpget = new HttpGet(                http://xxxx.com/xx.htm);        HttpResponse response = httpclient.execute(httpget);        HttpEntity entity = response.getEntity();        System.out.println("Login form get: " + response.getStatusLine());        if (entity != null) {            entity.consumeContent();        }        System.out.println("Initial set of cookies:");        List<Cookie> 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());            }        }        // action=xxx&Password=xxxx        HttpPost httpost = new HttpPost(                "http://localhost/sss");        List<NameValuePair> nvps = new ArrayList<NameValuePair>();        nvps.add(new BasicNameValuePair("LoginId", "xxxx"));        nvps.add(new BasicNameValuePair("Password", "xxxxx"));        nvps.add(new BasicNameValuePair("action", "xxxx"));        nvps.add(new BasicNameValuePair("eventSubmit_doPost", "xxxx"));        httpost.setEntity