Controller层参数注解

Controller层常用的注解

注解	作用
@Controller	处理http请求
@RestController	与@ResponseBody配合@Controller相同。用于返回Json
@PathVariable	获取url中的参数
@RequestParam	获取请求参数的值
@RequestMapping	配置url映射，需要多个时可以将value写成一个集合
@GetMapping	组合注解，相当于@RequestMapping(method = RequestMethod.GET)
@PostMapping	组合注解，相当于@RequestMapping(method = RequestMethod.POST)

---

@PathVariable

	@RequestMapping("/getuserid/{id}")
	public AjaxMessage getUser(@PathVariable("id") int id) {
    
    
		User user = userService.querUserById(id);
		if (user != null) {
    
    
			return new AjaxMessage(true, "", user);
		}else {
    
    
			return new AjaxMessage(false, "没有数据", null);
		}
	}

@RequestParam

	@RequestMapping("/getuserpwd")
	public AjaxMessage getUserPwd(@RequestParam("pwd") String password) {
    
    
		List<User> userList = userService.queryUserByPwd(password);
		if (userList != null) {
    
    
			return new AjaxMessage(true,"",userList);
		}else {
    
    
			return new AjaxMessage(false, "没有数据", new ArrayList<User>());
		}
	}

@RequestBody

@PostMapping(path = "/demo1")
public void demo1(@RequestBody Person person) {
    
    
    System.out.println(person.toString());
}

也可以是

@PostMapping(path = "/demo1")
public void demo1(@RequestBody Map<String, String> person) {
    
    
    System.out.println(person.get("name"));
}

可选参数

属性required = true/false 代表这个参数选填

• 在@PathVariable注解中，在@RequestMapping中，需列出各个url格式

	@RequestMapping(value = {
    
     "/checkidpv/{item}/{area}/{location}", "/checkidpv/{item}/{area}", "/checkidpv/{item}",
	"/checkidpv" }, method = RequestMethod.GET)
	public Object getSpotByIdPV(@PathVariable(value = "item", required = false) String item,
			@PathVariable(value = "area", required = false) String area,
			@PathVariable(value = "location", required = false) String location) {
    
    
		// function body
	}

• 在@RequestParam中，该属性写在注解中。另外，通过defaultValue属性设置默认值

	@RequestMapping(value = "/checkidrq", method = RequestMethod.GET)
	public Object getSpotByIdRP(@RequestParam(value = "item",required = false) String item, @RequestParam(value = "area",required = false) String area,
			@RequestParam(value = "location",required = false) String location) {
    
    
	  // function body
}