HttpClient发送带参数的Post请求

HttpClient 是apache 组织下面的一个用于处理HTTP 请求和响应的开源工具。所用jar包为httpclient-4.3.6.jar、httpcore-4.3.3.jar、httpmime-4.3.6.jar、commons-codec-1.6.jar。

发送Post请求代码如下：

package com.zkn.newlearn.httpclient;  
  
import java.io.BufferedReader;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.io.UnsupportedEncodingException;  
import java.util.List;  
  
import org.apache.http.Consts;  
import org.apache.http.HttpEntity;  
import org.apache.http.NameValuePair;  
import org.apache.http.client.ClientProtocolException;  
import org.apache.http.client.entity.UrlEncodedFormEntity;  
import org.apache.http.client.methods.CloseableHttpResponse;  
import org.apache.http.client.methods.HttpPost;  
import org.apache.http.impl.client.CloseableHttpClient;  
import org.apache.http.impl.client.HttpClients;  
import org.apache.http.message.BasicNameValuePair;  
  
import com.google.common.collect.Lists;  
  
/** 
 *  
 * @author zkn 2016-06-05 
 * 
 */  
public class HttpClientTest01 {     
  
    public static void main(String[] args) {  
        //创建HttpClient对象  
        CloseableHttpClient closeHttpClient = HttpClients.createDefault();  
        CloseableHttpResponse httpResponse = null;  
        //发送Post请求  
        HttpPost httpPost = new HttpPost("http://localhost:8080/MyWebxTest/getCityByProvinceEname.do");  
        //设置Post参数  
        List<NameValuePair> params = Lists.newArrayList();  
        params.add(new BasicNameValuePair("cityEname", "henan"));  
        try {  
            //转换参数并设置编码格式  
            httpPost.setEntity(new UrlEncodedFormEntity(params,Consts.UTF_8));  
            //执行Post请求 得到Response对象  
            httpResponse = closeHttpClient.execute(httpPost);  
            //httpResponse.getStatusLine() 响应头信息  
            System.out.println(httpResponse.getStatusLine());  
            //返回对象 向上造型  
            HttpEntity httpEntity = httpResponse.getEntity();  
            if(httpEntity != null){  
                //响应输入流  
                InputStream is = httpEntity.getContent();  
                //转换为字符输入流  
                BufferedReader br = new BufferedReader(new InputStreamReader(is,Consts.UTF_8));  
                String line = null;  
                while((line=br.readLine())!=null){  
                    System.out.println(line);  
                }  
                //关闭输入流  
                is.close();  
            }  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        } catch (ClientProtocolException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }finally{  
            if(httpResponse != null){  
                try {  
                    httpResponse.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
            if(closeHttpClient != null){  
                try {  
                    closeHttpClient.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
    }  
}