Java读取Web页面信息

Question

/*
 *
 * @parm httpConn an object of class HttpURLConnection
 * @param url an object of URL
 */
httpConn = (HttpURLConnection)url.openConnection();
httpConn.connect();
InputStream cin = httpConn.getInputStream();

 可以实现Java读取一个Web页面的信息，如果用Java读取一个需要登录认证的Web页面的信息，应该怎么实现或者在此基础上做些什么改进？？？

Answer 1

httpclient 模拟登陆网站 获取网站内容程序
package org.apache.http.examples.client;

import java.io.IOException;

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.cookie.*;
import org.apache.commons.httpclient.methods.*;

public class FormLoginDemo {
static final String LOGON_SITE = "www.intellitrans.com.cn";
static final int LOGON_PORT = 8081;
static final String loginurl = "/zyzg/logon.do";
static final String loginparematername = "userName";
static final String loginparematerpass = "password";
static final String username = "wangpx";
static final String password = "111111";

static final String getUrl = "/zyzg/hrmsub/hrm-deptlist.do"; 


public static void main(String[] args) throws Exception { 
    HttpClient client = imitateLogin(LOGON_SITE, LOGON_PORT, loginurl, loginparematername, loginparematerpass, username, password); 
    // 访问所需的页面 
    imitateGetUrl(client, getUrl); 
} 

//模拟等录 
private static HttpClient imitateLogin(String LOGON_SITE, int LOGON_PORT, 
        String loginurl,String loginparematername,String loginparematerpass,String username,String password) throws IOException, HttpException { 
    HttpClient client = new HttpClient(); 
    client.getHostConfiguration().setHost(LOGON_SITE, LOGON_PORT); 
    // 模拟登录页面 
    PostMethod post = new PostMethod(loginurl); 
    NameValuePair name = new NameValuePair(loginparematername,username ); 
    NameValuePair pass = new NameValuePair(loginparematerpass,password ); 
    post.setRequestBody(new NameValuePair[] { name, pass }); 
    int status = client.executeMethod(post); 
    System.out.println(post.getResponseBodyAsString()); 
    post.releaseConnection(); 
    // 查看cookie信息 
    CookieSpec cookiespec = CookiePolicy.getDefaultSpec(); 
    Cookie[] cookies = cookiespec.match(LOGON_SITE, LOGON_PORT, "/", false, 
            client.getState().getCookies()); 
    if (cookies != null) 
        if (cookies.length == 0) { 
            System.out.println("None"); 
        } else { 
            for (int i = 0; i < cookies.length; i++) { 
                System.out.println(cookies[i].toString()); 
            } 
        } 
    return client; 
} 
//模拟等录 后获取所需要的页面 
private static void imitateGetUrl(HttpClient client, String getUrl) 
        throws IOException, HttpException { 
    PostMethod post2 = new PostMethod(getUrl); 
    // GetMethod get = new 
    // GetMethod("/social/article/gallery_show/p_104846/"); 
    client.executeMethod(post2); 
    System.out.println(post2.getResponseBodyAsString()); 
    post2.releaseConnection(); 
} 

}