RestTemplate对象，进行get和post简单用法

如果只是针对纯Rest接口处理的话，我们可以使用restTemplate对象来操作，简单方便，可以不需要手写httpClient代码了。

我们看下基本的用法，如下：

1.getForObject

client:
@RestController
@RequestMapping("restTemp")
public class RestTemplateController { @GetMapping("getTest1") public void getTest1(){ String url = "http://具体iP地址/demo/demoTest?name={name}&email={email}"; Map<String,String> params = new HashMap<>(); params.put("name","yyc"); params.put("email","12306"); RestTemplate restTemplate = new RestTemplate(); String request = restTemplate.getForObject(url,String.class,params); //String request = restTemplate.getForObject(url,String.class,"yyc","email"); System.out.println(request); } }

server:

@GetMapping(value = "demoTest", produces = MediaType.APPLICATION_JSON_VALUE)
public String demoTest(@RequestParam String name,@RequestParam String email){ System.out.println(name); System.out.println(email); return "success";
}

2.getForEntity

client:

@GetMapping("getTest2")
    public void getTest2(){ String url = "http://具体iP地址:8080/demo/demoTest?name={name}&email={email}"; HttpHeaders headers = new HttpHeaders(); headers.set("phone","123456"); Map<String,Object> params = new HashMap<>(); params.put("name","yyc"); params.put("email","12306"); RestTemplate restTemplate = new RestTemplate(); HttpEntity httpEntity = new HttpEntity(headers); ResponseEntity<String> request = restTemplate.getForEntity(url,String.class,httpEntity,params); System.out.println(request.getBody()); }

server:

@GetMapping(value = "demoTest1", produces = MediaType.APPLICATION_JSON_VALUE)
    public String demoTest1(@RequestParam String name, @RequestParam String email, @RequestHeader String phone){ System.out.println(name); System.out.println(email); System.out.println(phone); return "success"; }

3.postForObject

这里的User类是实体类，在此本人不写了，请自行创建 User Entity。

server:

@PostMapping(value = "demoTest2", consumes = MediaType.APPLICATION_JSON_VALUE,produces = MediaType.APPLICATION_JSON_VALUE)
    public String demoTest2(@RequestBody User user, @RequestHeader String phone){ System.out.println(user.getName()); System.out.println(user.getEmail()); System.out.println(phone); return "success"; }

client:

@PostMapping("postTest1")
    public void postTest1() { String url = "http://IP:8080/demo/demoTest2"; HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); headers.set("phone", "123456"); Map<String, Object> params = new HashMap<>(); params.put("name", "yyc"); params.put("email", "12306"); RestTemplate restTemplate = new RestTemplate(); HttpEntity httpEntity = new HttpEntity(params,headers); ResponseEntity<String> request = restTemplate.postForEntity(url, httpEntity,String.class); System.out.println(request.getBody()); }

当所有传递的数据类型为复杂数据类型： headers.setContentType(MediaType.MULTIPART_FORM_DATA);

并且需要接受的参数不再实体类中进行映射。

MultiValueMap来进行传递。

server:

@PostMapping(value = "demoTest3",produces = MediaType.APPLICATION_JSON_VALUE)
    public String demoTest3(@RequestParam String name,String email, @RequestHeader String phone){ System.out.println(name); System.out.println(email); System.out.println(phone); return "success"; }

client:

@PostMapping("postTest2")
    public void postTest2() { String url = "http://ip:8080/demo/demoTest3"; HttpHeaders headers = new HttpHeaders(); headers.set("phone", "1234567"); MultiValueMap<String, Object> params = new LinkedMultiValueMap<>(); params.add("name", "yyc"); params.add("email", "123067"); RestTemplate restTemplate = new RestTemplate(); HttpEntity httpEntity = new HttpEntity(params, headers); ResponseEntity<String> request = restTemplate.postForEntity(url, httpEntity, String.class); System.out.println(request.getBody()); }



既有实体类，又有普通的参数
server:

@PostMapping(value = "demoTest4",produces = MediaType.APPLICATION_JSON_VALUE)
    public String demoTest4(@RequestBody User user,String sex, @RequestHeader String phone){ System.out.println(user.getName()); System.out.println(user.getEmail()); System.out.println(sex); System.out.println(phone); return "success"; }

client:

@PostMapping("postTest3")
    public void postTest3() { String url = "http://ip:8080/demo/demoTest4?sex={sex}"; HttpHeaders headers = new HttpHeaders(); headers.set("phone", "1234567"); Map<String, Object> params = new HashMap<>(); params.put("name", "yyc"); params.put("email", "123067"); Map<String,Object> other = new HashMap<>(); other.put("sex","男"); RestTemplate restTemplate = new RestTemplate(); HttpEntity httpEntity = new HttpEntity(params, headers); ResponseEntity<String> request = restTemplate.postForEntity(url, httpEntity, String.class,other); System.out.println(request.getBody()); }