11. SpringMVC-常用注解

1) springMVC常用注解

注解	作用域	说明
`@Controller	类	Controller标识
`@RequestMapping	类/方法	URL映射
`@ResponseBody	类/方法	以Json方式返回
`@RequestParam	参数	按名字接收参数
`@RequestBody	参数	接收Json参数
`@PathVariable	参数	接收URL中的参数

2) 组合注解

1. @RestController = @Controller + @ResponseBody
2. @GetMapping = @RequestMapping(method = RequestMethod.GET)
3. @PostMapping = @RequestMapping(method = RequestMethod.POST)
4. @PutMapping = @RequestMapping(method = RequestMethod.PUT)
5. @PatchMapping = @RequestMapping(method = RequestMethod.PATCH)
6. @DeleteMapping = @RequestMapping(method = RequestMethod.DELETE)

3) 接收参数

1. @RequestParam 属性
   • name: String 参数名称，默认取后续定义的变量名称
   • value: String name属性别名
   • required: boolean 是否必传
   • defaultValue: String 参数默认值

@ApiOperation("Hello Spring Boot 方法")
    @GetMapping("/")
    public String hello(@RequestParam(required = false) @ApiParam("名字")
                        String name) {
        if (!StringUtils.isEmpty(name)) {
            return String.format("Hello %s", name);
        }
        return "Hello Spring Boot";
    }

2. @PathVariable方式
   • name: String 参数名称，默认取后续参数定义的名称
   • value: String name属性别名
   • required: boolean 制是否必传

@ApiOperation(value = "@PathVariable方式")
@GetMapping("/pathvariable/{name}/{age}")
public User PathVariable(@PathVariable String name,@PathVariable int age) {
      ...
      return user;
}

3. @RequestBody方式
   • required: boolean 是否必传

@ApiOperation(value = "@RequestBody方式")
@PostMapping("/requestbody")
public User RequestBody(@RequestBody User user) {
    return user;
}