HttpClient的学习-优快云博客

本文介绍了Apache HttpClient的功能特性，包括支持多种HTTP方法、自动重定向、HTTPS及代理服务器等功能。通过示例代码展示了如何使用HttpClient进行GET和POST请求。

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[size=large]HttpClient简介[/size]

HttpClient是Apache Jakarta Common 下的子项目，用来提供高效的、最新的、功能丰富的支持HTTP协议的客户端编程工具包，并且它支持HTTP协议最新的版本和建议。

[size=large]HttpClient功能介绍[/size]

以下列出的是HttpClient提供的主要的功能：
1.实现了所有HTTP的方法(GET,POST,PUT,HEAD等)
2.支持自动转向
3.支持HTTPS协议
4.支持代理服务器等
更多功能可参见[url]http://wiki.apache.org/jakartahttpclient/HttpClientPowered[/url]．
以下是实现代码：

package com.httpclient;

import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class HttpClientTest{
	private static final Log log = LogFactory.getLog(HttpClientTest.class);

	public static void main(String[] args){
		HttpClient httpClient=null;
		HttpMethod method=null;
		try{
			//构造HttpClient实例,默认构造函数就已经够用了.
			httpClient=new HttpClient();
//			Get方法的调用
//			GetMethod getMethod = new GetMethod("http://www.baidu.com");
//			httpClient.executeMethod(getMethod);
//			getMethod.getStatusCode();
//			log.info("Message ->"+getMethod.getResponseBodyAsString());

			//POST方法的调用
			httpClient.getHostConfiguration().setHost("http://www.sina.com",80,"http");
			method = getPostMethod();

			int statusCode = httpClient.executeMethod(method);
			log.debug("StatusCode->"+statusCode);
			log.info("StatusLine->"+method.getStatusLine());
			String msg = method.getResponseBodyAsString();
			log.info("Message->"+msg);
		}catch(IOException e){
			log.info("IOException :" +e.getMessage());
		}finally{
			//无论怎样method都必须release.
			if(method!=null) method.releaseConnection();
		}
	}

	public static HttpMethod getPostMethod(){
		PostMethod post = new PostMethod("/main.jsp");
		//设置所需的参数
		NameValuePair username=new NameValuePair("loginId","123");
		NameValuePair password=new NameValuePair("password","123456");
		post.setRequestBody(new NameValuePair[]{username,password});
		return post;
	}
}