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每个对应版本都有 快速开始的示例

maven项目

pom依赖

<dependencies>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.12</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>RELEASE</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.2</version>
        <scope>test</scope>
    </dependency>
</dependencies>

 

在测试类里测试

package com.example;


import org.apache.http.HttpStatus;
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;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @author hrui
 * @date 2023/11/17 12:35
 */
public class HttpClientTestTest{


    @Test
    public void testGet(){
        //发起get请求,编程方式处理http请求
        String url="https://restapi.amap.com/v3/ip?key=0113a13c88697dcea6a445584d535837&ip=60.25.188.64";
        //1.创建HttpClient对象
        CloseableHttpClient client= HttpClients.createDefault();
        //2.创建HttpGet对象
        HttpGet httpGet=new HttpGet(url);
        //httpGet.setHeader("token", "xxxxxx");可能对方网站需要某些校验的时候,在请求头设置值
        try{
            //3.执行请求,使用client对象的方法,执行请求后获取返回结果

            CloseableHttpResponse response = client.execute(httpGet);
            // 处理响应  200成功
            if(response.getStatusLine().getStatusCode()== HttpStatus.SC_OK){
                // 如果需要处理响应内容，可以在这里获取响应实体
//                HttpEntity responseEntity = response.getEntity();
//                InputStream content = responseEntity.getContent();//返回流原因是不只字符串  还有视频 音频 图片等等

                //如果确定是字符串也封装了对应方法
                String json = EntityUtils.toString(response.getEntity());
                System.out.println(json);
            }

        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if(client!=null){
                try {
                    client.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    @Test
    public void test02(){

            //1.创建HttpClient对象
            CloseableHttpClient client= HttpClients.createDefault();
            //2.创建HttpGet对象
            String url="https://restapi.amap.com/v3/ip";
            HttpPost httpPost=new HttpPost(url);

            //httpPost.setHeader("token", "xxxxxx");可能对方网站需要某些校验的时候,在请求头设置值
            //3.准备参数
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            nvps.add(new BasicNameValuePair("key", "0113a13c88697dcea6a445584d535837"));
            nvps.add(new BasicNameValuePair("ip", "60.25.188.64"));
        try {
            //4.设置使用参数
            httpPost.setEntity(new UrlEncodedFormEntity(nvps));//构建表单  name=xxx&password=xxx形式


//            httpPost.setHeader("Content-Type", "application/json");
//            // 设置请求体（如果有）
//            String requestBody = "{\"key\": \"value\"}";
//            httpPost.setEntity(new StringEntity(requestBody));//如果是JSON

            //5.执行请求
            CloseableHttpResponse response = client.execute(httpPost);

            if(response.getStatusLine().getStatusCode()==HttpStatus.SC_OK){
                String s = EntityUtils.toString(response.getEntity());
                System.out.println(s);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if(client!=null){
                try {
                    client.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}