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();
        }
    }
}