@RestController 注解的类,其方法返回的数据为json格式

@RestController 包含的注解

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Controller
@ResponseBody
public @interface RestController {
	String value() default "";
}

使用 @ResponseBody注解的方法返回的数据格式是json串

@RestController  = @Controller  + @ResponseBody

举例

@RestController
public class JsonController {
    @GetMapping(value = "/hello")
    public List<UserVo> hello() {
        List<UserVo> list = new ArrayList<>();
        list.add(new UserVo("周一",10));
        list.add(new UserVo("周二",20));
        return list;
    }

　　 // 无用注解
    @GetMapping(value = "/hello2")
    public @ResponseBody List<UserVo> hello2() {
        List<UserVo> list = new ArrayList<>();
        list.add(new UserVo("四",10));
        list.add(new UserVo("三",20));
        return list;
    }
}

[{"name":"四","age":10},{"name":"三","age":20}]