1、建立配置类

package com.example.mytest.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

@Configuration
public class RestTemplateConfig {
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory factory){
        return new RestTemplate(factory);
    }

    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setReadTimeout(5000);//单位为ms
        factory.setConnectTimeout(5000);//单位为ms
        return factory;
    }
}

2、逻辑代码中加入依赖注入

@Autowired
    private RestTemplate restTemplate;

3、调用逻辑
1）POST调用

@Override
    public ResponseEntity<JSONObject> restTempleteApi(String token, List<TStudent> student){
        //设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("token",token);
        //  封装参数，千万不要替换为Map与HashMap，否则参数无法传递
        // MultiValueMap<String, Object> params= new LinkedMultiValueMap<>();

        HttpEntity<List<TStudent>> requestEntity = new HttpEntity<>(student, headers);

        ResponseEntity<JSONObject> response = restTemplate.exchange("xxxxxx", HttpMethod.POST, requestEntity, JSONObject.class);

        return response;
    }

2）get请求

JSONObject result=restTemplate.getForObject("xxxxxxxxxxxxxx",JSONObject.class);