利用HttpClient发送Get和Post请求

package JanGin.httpClient.demo;

 

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

 

import org.apache.http.HttpEntity;

import org.apache.http.NameValuePair;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

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 org.apache.http.util.EntityUtils;

import org.junit.Test;

 

public class FirstDemo {

 

    /**

     * 通过GET方式发起http请求

     */

    @Test

    public void requestByGetMethod(){

        //创建默认的httpClient实例

        CloseableHttpClient httpClient = getHttpClient();

        try {

            //用get方法发送http请求

            HttpGet get = new HttpGet("http://www.baidu.com");

            System.out.println("执行get请求:...."+get.getURI());

            CloseableHttpResponse httpResponse = null;

            //发送get请求

            httpResponse = httpClient.execute(get);

            try{

                //response实体

                HttpEntity entity = httpResponse.getEntity();

                if (null != entity){

                  System.out.println("响应状态码:"+ httpResponse.getStatusLine());

                  System.out.println("--------------");

                  System.out.println("响应内容:" + EntityUtils.toString(entity));

                  System.out.println("--------------");                   

                }

            }

            finally{

                httpResponse.close();

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        finally{

            try{

                closeHttpClient(httpClient);

            } catch (IOException e){

                e.printStackTrace();

            }

        }

 

    }

     

     

    /**

     * POST方式发起http请求

     */

    @Test

    public void requestByPostMethod(){

        CloseableHttpClient httpClient = getHttpClient();

        try {

            HttpPost post = new HttpPost("http://localhost/....");          //这里用上本机的某个工程做测试

            //创建参数列表

            List<NameValuePair> list = new ArrayList<NameValuePair>();

            list.add(new BasicNameValuePair("j_username", "admin"));

            list.add(new BasicNameValuePair("j_password", "admin"));

            //url格式编码

            UrlEncodedFormEntity uefEntity = new UrlEncodedFormEntity(list,"UTF-8");

            post.setEntity(uefEntity);

            System.out.println("POST 请求...." + post.getURI());

            //执行请求

            CloseableHttpResponse httpResponse = httpClient.execute(post);

            try{

                HttpEntity entity = httpResponse.getEntity();

                if (null != entity){

                  System.out.println("----------------");

                  System.out.println(EntityUtils.toString(uefEntity));

                  System.out.println("----------------");

                }

            } finally{

                httpResponse.close();

            }

             

        } catch( UnsupportedEncodingException e){

            e.printStackTrace();

        }

        catch (IOException e) {

            e.printStackTrace();

        }

        finally{

            try{

                closeHttpClient(httpClient);               

            } catch(Exception e){

                e.printStackTrace();

            }

        }

         

    }

     

    private CloseableHttpClient getHttpClient(){

        return HttpClients.createDefault();

    }

     

    private void closeHttpClient(CloseableHttpClient client) throws IOException{

        if (client != null){

            client.close();

        }

    }

}