Apache HttpComponents Client 4.0快速入门/升级-2.POST方法访问网页（转）

Http POST方法得到www.g.cn的源码：

import java.io.IOException;   
import java.util.ArrayList;   
import java.util.List;   
import org.apache.commons.httpclient.NameValuePair;   
import org.apache.commons.httpclient.methods.PostMethod;   
import org.apache.http.HttpEntity;   
import org.apache.http.HttpResponse;   
import org.apache.http.ParseException;   
import org.apache.http.client.entity.UrlEncodedFormEntity;   
import org.apache.http.client.methods.HttpPost;   
import org.apache.http.impl.client.DefaultHttpClient;   
import org.apache.http.message.BasicNameValuePair;   
import org.apache.http.protocol.HTTP;   
import org.apache.http.util.EntityUtils;   
public class PostSample {   
    public static void main(String[] args) throws ParseException, IOException {   
        String url = "http://www.g.cn/";   
        System.out.println(url);   
        System.out.println("Visit google using Apache commons-httpclient 3.1：");   
        List<NameValuePair> data3 = new ArrayList<NameValuePair>();   
        data3.add(new NameValuePair("username", "testuser"));   
        data3.add(new NameValuePair("password", "testpassword"));   
        System.out.println(post3(url, data3));   
        System.out.println("Visit google using Apache HttpComponents Client 4.0：");   
        List<BasicNameValuePair> data4 = new ArrayList<BasicNameValuePair>();   
        data4.add(new BasicNameValuePair("username", "testuser"));   
        data4.add(new BasicNameValuePair("password", "testpassword"));   
        System.out.println(post4(url, data4));   
    }   
    /** 使用Apache commons-httpclient 3.1，POST方法访问网页 */  
    public static String post3(String url, List<NameValuePair> data) throws IOException {   
        org.apache.commons.httpclient.HttpClient httpClient = new org.apache.commons.httpclient.HttpClient();   
        PostMethod postMethod = new PostMethod(url);   
        postMethod.setRequestBody(data.toArray(new NameValuePair[data.size()]));   
        try {   
            System.out.println("<< Response: " + httpClient.executeMethod(postMethod));   
            return postMethod.getResponseBodyAsString();   
        } finally {   
            postMethod.releaseConnection();   
        }   
    }   
    /** 使用Apache HttpComponents Client 4.0，POST方法访问网页 */  
    private static String post4(String url, List<? extends org.apache.http.NameValuePair> data)   
            throws ParseException, IOException {   
        org.apache.http.client.HttpClient client = new DefaultHttpClient();   
        HttpPost httpost = new HttpPost(url);   
        httpost.setEntity(new UrlEncodedFormEntity(data, HTTP.UTF_8));   
        try {   
            HttpResponse response = client.execute(httpost);   
            HttpEntity entity = response.getEntity();   
            System.out.println("<< Response: " + response.getStatusLine());   
            if (entity != null) {   
                return EntityUtils.toString(entity);   
            }   
            return null;   
        } finally {   
            client.getConnectionManager().shutdown();   
        }   
    }   
}  

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/inkfish/archive/2009/11/02/4757754.aspx