详解SpringCloud微服务之Rest

一、什么是RestTemplate？

RestTemplate 是一个HTTP客户端，在Spring Cloud的服务调用方使用它我们可以方便的调用HTTP接口，支持GET、POST、PUT、DELETE等方法。

二、四种请求方式

首先注入Bean对象

@Configuration
public class MyConfig {
 @Bean
 public RestTemplate restTemplate(){
     return new RestTemplate();
 }
}

2.1 GET请求

• getForObject

@GetMapping("get/{id}")
public CommonResult getUser(@PathVariable Long id) {
   CommonResult commonResult
   = restTemplate.getForObject(Url + "/user/{1}", CommonResult.class, id);

return commonResult
}

• getForEntity

@GetMapping("/get/{sex}")
public CommonResult getUser(@PathVariable String sex) {
   ResponseEntity<CommonResult> entity
       = restTemplate.getForEntity(Url + "/user/{女}", CommonResult.class, sex);

if (entity.getStatusCode().is2xxSuccessful()) {
       return entity.getBody();
   } else {
       return new CommonResult("操作失败", 500);
   }
}

2.2 POST请求

• postForObject

@PostMapping("/add")
public CommonResult add(@RequestBody User user) {
   CommonResult commonResult
   = restTemplate.postForObject(Url + "/user/add", user, CommonResult.class);

return commonResult;
}

• postForEntity

@PostMapping("/add")
public CommonResult add(@RequestBody User user) {
   CommonResult commonResult
   = restTemplate.postForEntity(Url + "/user/add", user, CommonResult.class)
   return commonResult.getBody();
}

2.3 PUT请求

@PutMapping("/update")
public CommonResult update(@RequestBody User user) {
   restTemplate.put(Url + "/user/update", user);

return new CommonResult("操作成功",200);
}

2.4 DELETE请求

@DeleteMapping("/delete/{id}")
public CommonResult delete(@PathVariable Long id) {
  restTemplate.delete(Url + "/user/delete/" + id, null);

return new CommonResult("操作成功",200);
}

来源：https://blog.csdn.net/qq_45747519/article/details/114580662