RestTemplate#

package com.luguosong.resttemplatehello.config;

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

/**
 * @author luguosong
 */
@Configuration
public class RestTemplateConfig {

    /*
    * 将RestTemplate注册到Spring容器
    * */
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

package com.luguosong.resttemplatehello.controller;

import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * @author luguosong
 */
@RestController
@RequiredArgsConstructor
public class TestController {

    //使用构造函数依赖注入RestTemplate
    private final RestTemplate template;

    @GetMapping("/test")
    public String test() {
        //获取响应
        ResponseEntity<String> response = template.exchange("http://localhost:8080/demo",
                HttpMethod.GET,
                null,
                String.class);

        //判断响应是否成功
        if (!response.getStatusCode().is2xxSuccessful()) {
            return "服务调用失败";
        }

        //获取并返回响应体
        return response.getBody();
    }
}