HttpClient

导入依赖

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>

　　编写测试类

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.Test;

import java.io.IOException;

public class HttpClientTest {
    @Test
    public void test(){
        HttpClient httpClient = HttpClients.createDefault ();
        HttpGet httpGet = new HttpGet ("http://115.28.108.130:8080/DemoController/getUserById?id=1");
        try {
            HttpResponse response = httpClient.execute (httpGet);
            HttpEntity entity = response.getEntity ();
            String s = EntityUtils.toString (entity);
            System.out.println (s);
        } catch (IOException e) {
            e.printStackTrace ();
        }
    }
}

　　

运行测试结果

15:39:52.888 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection released: [id: 0][route: {}->http://115.28.108.130:8080][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
{"code":200,"object":{"age":0,"email":"test@jd.com","id":0,"username":"小强"},"success":true}

　　

------------------------------------------get方法入参通过URIBuilder------------------

package com.longteng.lesson2;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.Test;

import java.io.IOException;
import java.net.URISyntaxException;

public class HttpClientTest {
    @Test
    public void test() throws URISyntaxException {
        HttpClient httpClient = HttpClients.createDefault ();
        String url ="http://115.28.108.130:8080/DemoController/getUserById";
        try {
            URIBuilder uriBuilder =new URIBuilder (url);
            uriBuilder.addParameter ("id","1");
            HttpGet httpGet =new HttpGet (uriBuilder.build ());
            HttpResponse response = httpClient.execute (httpGet);
            HttpEntity entity = response.getEntity ();
            int statusCode = response.getStatusLine ().getStatusCode ();
            System.out.println (statusCode);
            String s = EntityUtils.toString (entity);
            System.out.println (s);
        } catch (IOException e) {
            e.printStackTrace ();
        }
    }
}

返回结果

16:20:14.888 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection released: [id: 0][route: {}->http://115.28.108.130:8080][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
{"code":200,"object":{"age":0,"email":"test@jd.com","id":0,"username":"小强"},"success":true}

　---------------------------POST方法

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.Test;

import javax.swing.text.html.parser.Entity;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;

public class HttpClientTest {
  
    @Test
    public void test2(){
        String url ="http://115.28.108.130:8080/DemoController/createUser";
        HttpClient httpClient = HttpClients.createDefault ();
        HttpPost httpPost=new HttpPost (url);
        String param ="{"username":"小强","age":10}";
        try {
            StringEntity stringEntity = new StringEntity (param);
            httpPost.setEntity (stringEntity);
            HttpResponse response = httpClient.execute (httpPost);
            System.out.println (response.getStatusLine ().getStatusCode ());
            System.out.println (EntityUtils.toString (response.getEntity ()).toString ());
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace ();
        } catch (ClientProtocolException e) {
            e.printStackTrace ();
        } catch (IOException e) {
            e.printStackTrace ();
        }

    }
}

　　运行结果

16:42:20.727 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection released: [id: 0][route: {}->http://115.28.108.130:8080][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
{"code":200,"msg":"创建成功","success":true}