SpringMVC中的@ControllerAdvice使用场景详解

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface ControllerAdvice {
    // 控制的扫描包范围
    @AliasFor("basePackages")
    String[] value() default {};
    // 控制的扫描包范围
    @AliasFor("value")
    String[] basePackages() default {};
    // 控制的包类
    Class<?>[] basePackageClasses() default {};
    // @Controller或者@RestController的类 的数据
    Class<?>[] assignableTypes() default {};
    // 控制范围可以用注解进行配置
    Class<? extends Annotation>[] annotations() default {};
}

@ControllerAdvice(basePackages = "com.kevin.tool")
public class ExceptionHandlerController {
    /**
     * 错误后返回json
     * 如果想跳转到专门的异常界面，则可以返回{@link org.springframework.web.servlet.ModelAndView}
     *
     * @return 标准异常json
     */
    @ResponseBody
    @ExceptionHandler(Exception.class)
    public Map<String, String> handler() {
        Map<String, String> errorMap = new HashMap<String, String>(16);
        errorMap.put("code", "500");
        errorMap.put("msg", "系统异常，请稍后重试");
        return errorMap;
    }
}

@RestController
public class ControllerAdviceDemoController {
    @ResponseBody
    @RequestMapping("bindException")
    public String bindException() {
        getMessage();
        return "ok";
    }
    private void getMessage() {
        throw new RuntimeException("未知异常！");
    }
}

@ControllerAdvice(basePackages = "com.kevin.tool")
public class ExceptionHandlerController {
    @InitBinder("date")
    public void globalInitBinder(WebDataBinder binder) {
        binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd"));
    }
}

@RestController
public class ControllerAdviceDemoController {
    @ResponseBody
    @RequestMapping(value = "/initBind", method = RequestMethod.GET)
    public String detail(@RequestParam("id") long id, Date date) {
        System.out.println(date);
        System.out.println(id);
        return "ok";
    }
}

@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ModelAttribute {
    
    @AliasFor("name")
    String value() default "";
    
    @AliasFor("value")
    String name() default "";
 
    boolean binding() default true;
}

@ControllerAdvice(basePackages = "com.kevin.tool")
public class ExceptionHandlerController {
 
    @ModelAttribute
    public void addAttributes(Model model) {
        model.addAttribute("msg", "hello");
 
        HashMap<String, String> map = new HashMap<>(16);
        map.put("version", "1.0.0");
        map.put("name", "XXX平台");
        model.addAttribute("platform", map);
    }
}

@RestController
public class ControllerAdviceDemoController {
 
    @GetMapping("/modelAttributeTest")
    private String modelAttributeTest(@ModelAttribute("msg") String msg,
        @ModelAttribute("platform") Map<String, String> platform) {
 
        String result = "msg：" + msg + "<br>" + "info：" + platform;
        return result;
    }
 
}