HttpClient 发送Post,Get请求例子（包含设置请求头信息和获取返回头信息）

package com.test.action;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

/**
*
* 依赖 commons-httpclient-3.1.jar commons-codec-1.4.jar
* @author tianjun
*
*/
public class PostTest
{

public static void main(String[] args)

{

// （1）构造HttpClient的实例

HttpClient httpClient = new HttpClient();

// （2）创建POST方法的实例

PostMethod postMethod = new PostMethod(

"http://localhost:8080/b/test1.do");

// GetMethod getMethod = new

// GetMethod("http://localhost:8080/b/test1.do");

// （3）设置http request头

List<Header> headers = new ArrayList<Header>();

headers.add(new Header("tianjun_key","tianjun_value"));

httpClient.getHostConfiguration().getParams().setParameter(

"http.default-headers", headers);

// 使用系统提供的默认的恢复策略

postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,

new DefaultHttpMethodRetryHandler());

// getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,

// new DefaultHttpMethodRetryHandler());

try

{

// （4）执行postMethod

int statusCode = httpClient.executeMethod(postMethod);

if (statusCode != HttpStatus.SC_OK)

{

System.err.println("Method failed:"

+ postMethod.getStatusLine());

}

// （5）读取response头信息

Header headerResponse = postMethod

.getResponseHeader("response_key");

String headerStr = headerResponse.getValue();

// （6）读取内容

byte[] responseBody = postMethod.getResponseBody();

// （7） 处理内容

System.out.println(headerStr);

System.out.println(new String(responseBody));

} catch (HttpException e)

{

// 发生致命的异常，可能是协议不对或者返回的内容有问题

System.out.println("Please check your provided http address!");

e.printStackTrace();

} catch (IOException e)

{

e.printStackTrace();

} catch (Exception e)

{

e.printStackTrace();

} finally

{

// 释放连接

postMethod.releaseConnection();

}

}
}