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();


}

}
}

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转载自www.cnblogs.com/skinchqqhah/p/10180916.html