RestTemplate的Post和Get請求-發送請求參數，接受請求參數

一.表單提交

Postman發送Get請求和Post請求

可以獲取

//Get請求
@GetMapping("/form/get")
public void testFormGet(User user){}
@GetMapping("/form/get")
public void testFormGet(@RequestParam String name, @RequestParam String phone, @RequestParam Integer age){}
@GetMapping("/form/get")
public void testFormGet(String name, String phone, Integer age){}
@GetMapping("/form/get")
//不管發送過來的字段是什麼類型,user都是Map<String, String>
public void testFormGet(@RequestParam Map user){
//Post請求
@PostMapping("/form/post")
public void testFormPost(User user){}
@PostMapping("/form/post")
public void testFormPost(@RequestParam String name, @RequestParam String phone, @RequestParam Integer age){}
@PostMapping("/form/post")
public void testFormPost(String name, String phone, Integer age){}
@PostMapping("/form/post")
public void testFormPost(@RequestParam Map user){}

不可以獲取

//Get請求
@GetMapping("/form/get")
public void testFormGet(@RequestParam User user){}
@GetMapping("/form/get")
public void testFormGet(Map user){}
@GetMapping("/form/get")
public void testFormGet(TreeMap user){}
@GetMapping("/form/get")
public void testFormGet(@RequestParam TreeMap user){}
//Post請求
@PostMapping("/form/post")
public void testFormPost(@RequestParam User user){}
@PostMapping("/form/post")
public void testFormPost(Map user){}
@PostMapping("/form/post")
public void testFormPost(TreeMap user){}
@PostMapping("/form/post")
public void testFormPost(@RequestParam TreeMap user){}

程序發送Post和Get請求

Post請求，controller接收請求同上。

HttpHeaders httpHeaders = new HttpHeaders();
RestTemplate restTemplate = new RestTemplate();
String url = "http://127.0.0.1:8081/api/v1/form/post";
httpHeaders.setContentType(MediaType.MULTIPART_FORM_DATA); 
//兩種方式都可以
//httpHeaders.setContentType(MediaType.MULTIPART_FORM_DATA);
MultiValueMap<String,Object> params = new LinkedMultiValueMap<>();
params.add("name", "小明");
params.add("age", 18);
params.add("phone", "135********");
HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity(params, httpHeaders);
ResponseEntity<String> responseEntity = restTemplate.exchange(url, POST, requestEntity, String.class);
System.out.println(responseEntity.getBody());

Post請求，controller接收請求同上。

RestTemplate restTemplate = new RestTemplate();
String url = "http://127.0.0.1:8081/api/v1/form/post";
MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();
params.add("name", "小明");
params.add("age", 18);
params.add("phone", "135********");
String result = restTemplate.postForObject(url, params, String.class);
System.out.println(result);

Get請求，controller接收請求同上。

RestTemplate restTemplate = new RestTemplate();
String url = "http://127.0.0.1:8081/api/v1/form/get?name={name}&age={age}&phone={phone}";
Map<String, String> map = new HashMap<>();
map.put("name","小明");
map.put("age","18");
map.put("phone", "135********");
//如果前端返回的map和實體類屬性相同，可以轉換爲實體類對象
User responseEntity = restTemplate.getForObject(url,User.class,map);
System.out.println(responseEntity);