httpClient入门案例

简介:

HttpClient是Apache Jakarta common 下的子项目,可以用来提供高效的、最新的、功能丰富的支持HTTP协议的客户端编程工具包,并且它支持HTTP协议最新的版本和建议。

说明:

httpClient是现在企业中使用较多的跨域请求的方式.

1.引入jar包文件

 


    org.apache.httpcomponents
    httpclient
    4.5.5

2.入门Demo

package com.jt.web.httpclient;


import java.io.IOException;

import org.apache.http.client.ClientProtocolException;
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.util.EntityUtils;
import org.junit.Test;

public class TestHttpClient {
    
    /**
     * 1.定义httpClient对象
     * 2.定义访问的url
     * 3.定义请求方式
     * 4.发起http请求
     * 5.获取响应结果
     * @throws IOException
     * @throws ClientProtocolException
     */
    //@Test
    public void test01() throws ClientProtocolException, IOException{
        //定义http请求对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        
        //定义url
        String url = "http://news.cctv.com/special/jujiao/2017/808/index.shtml";
        
        //定义请求方式
        HttpGet httpGet = new HttpGet(url);
        
        //发起请求
        CloseableHttpResponse response  = httpClient.execute(httpGet);
        
        if(response.getStatusLine().getStatusCode() == 200){
            System.out.println("恭喜您请求发送正确");
            String html = EntityUtils.toString(response.getEntity(),"UTF-8");
            System.out.println(html);
        }else{
            System.out.println("对不起请求失败");
        }
    }
    
    //@Test
    public void testPost() throws ClientProtocolException, IOException{
        CloseableHttpClient client = HttpClients.createDefault();
        
        String url = "http://www.iqiyi.com/v_19rrak1hy8.html";
        
        HttpPost post = new HttpPost(url);
        
        CloseableHttpResponse response = client.execute(post);
        
        String html = EntityUtils.toString(response.getEntity());
        System.out.println(html);
    }
    
    
}

 

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