SpringBoot使用RestTemplate

た入场券 2022-10-18 01:28 214阅读 0赞

**一.RestTemplate简介**  
Spring RestTemplate 是 Spring 提供的用于访问 Rest 服务的客户端，RestTemplate 提供了多种便捷访问远程Http服务的方法，能够大大提高客户端的编写效率，所以很多客户端比如 Android或者第三方服务商都是使用 RestTemplate 请求 restful 服务。

**二.实战应用**  
1.创建实例

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

2.使用

@Autowired
     private RestTemplate restTemplate;

（1）get请求-----get请求是通过url传递参数  
【1】无参  
发送方

String url = "http://localhost:8081/Student/Hello";
    ResponseEntity<String> forEntity = restTemplate.getForEntity(url, String.class);
    String body = forEntity.getBody();

接收方

@GetMapping("Hello")
        public String Hello(){ 
            return "Hello";
    }

【2】  
发送方

String str ="你好";
    String url = "http://localhost:8081/Student/Hello/";
    ResponseEntity<String> forEntity = restTemplate.getForEntity(url+str, String.class);
    String body = forEntity.getBody();

接收方

@GetMapping("Hello/{str}")
        public String Hello(@PathVariable String str){ 
            return str;
    }

【3】  
发送方

String name = "陈鹏";
            HashMap<String, String> map = new HashMap<>();
            map.put("name",name);
            String url = "http://localhost:8081/Test/test/{name}";
            ResponseEntity<String> responseEntity = restTemplate.getForEntity(url, String.class, map);
            return responseEntity.getBody();

接收方

@GetMapping("/test/{name}")
        public String test(@PathVariable String name){ 
            return name;
        }

（2）post请求方式  
【1】  
发送方

Student stu = new Student("陈鹏",12);
            String url = "http://localhost:8081/Test/test/";
            ResponseEntity<String> responseEntity = restTemplate.postForEntity(url,stu,String.class);
            return responseEntity.getBody();

接收方

@PostMapping("/test")
        public String test(@RequestBody Student student){ 
            return student.toString();
        }

【2】  
发送方

HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON_UTF8);//设置参数类型和编码
            Student student = new Student("陈",15);
            Map<String,Student> map = new HashMap<>();
            map.put("student",student);
            HttpEntity<Map<String,Student>> request1 = new HttpEntity<>(map, headers);//包装到HttpEntity
            //postForEntity -》 直接传递map参数
            ResponseEntity<String> respo = restTemplate.postForEntity("http://localhost:8081/Test/test", map, String.class);
            return respo.getBody();

接收方

@PostMapping("/test")
        public String test(@RequestBody Map<String, Student> map){ 
            Student student = map.get("student");
            return student.toString();
        }

**三.参考**  
[RestTemplate post请求传递map。  
][RestTemplate post_map_]  
[RestTemplate post请求传参方式  
][RestTemplate post_]  
[Spring RestTemplate中几种常见的请求方式  
][Spring RestTemplate_]  
[RestTemplate 的传参方式（Get、Put、Post）  
][RestTemplate _Get_Put_Post_]  
[RestTemplate 用法详解  
][RestTemplate _]

[RestTemplate post_map_]: https://blog.csdn.net/laolvbig/article/details/82225681
[RestTemplate post_]: https://blog.csdn.net/u014692324/article/details/98876094
[Spring RestTemplate_]: https://wangsong.blog.csdn.net/article/details/77917939
[RestTemplate _Get_Put_Post_]: https://blog.csdn.net/baidu_27414099/article/details/104439734
[RestTemplate _]: https://blog.csdn.net/jinjiniao1/article/details/100849237