SpringBoot中使用@ControllerAdvice注解详解

/**
 * @ClassName:CustomExceptionHandler
 * @Description: 全局异常捕获
 * @Author: 
 * @Date: 2020/5/25、13:38
 */
@Slf4j
@ControllerAdvice(annotations = {Controller.class, RestController.class})
public class WebControllerAdvice {
    @ResponseBody
    @ExceptionHandler
    public Map errorHandler(Exception ex) {
        Map errorMap = new HashMap();
        errorMap.put("code", 400);
        //判断异常的类型,返回不一样的返回值
        if (ex instanceof MissingServletRequestParameterException) {
            errorMap.put("msg", "缺少必需参数：" + ((MissingServletRequestParameterException) ex).getParameterName());
        } else if (ex instanceof MyException) {
            errorMap.put("msg", "这是自定义异常");
        }
        return errorMap;
    }

/**
 * @ClassName:MyException
 * @Description: 定义异常
 * @Author: 
 * @Date: 2020/5/25、13:44
 */
public class MyException extends RuntimeException {
    private long code;
    private String msg;
    public MyException(Long code, String msg) {
        super(msg);
        this.code = code;
        this.msg = msg;
    }
    public MyException(String msg) {
        super(msg);
        this.msg = msg;
    }
}

@RestController
public class TestController {
    @RequestMapping("testException")
    public String testException() throws Exception{
        throw new MissingServletRequestParameterException("name","String");
    }
    @RequestMapping("testMyException")
    public String testMyException() throws MyException{
        throw new MyException("i am a myException");
    }

/**
 * @ClassName:MyGlobalDataHandler
 * @Description: 全局数据
 * @Author: 
 * @Date: 2020/5/25、14:01
 */
@ControllerAdvice
public class MyGlobalDataHandler {
    @ModelAttribute(name = "md")
    public Map<String,Object> getGlobalData(){
        HashMap<String, Object> map = new HashMap<>();
        map.put("age", 99);
        map.put("gender", "男");
        return map;
    }

  @GetMapping("/hello")
    public String hello(Model model) {
        Map<String, Object> map = model.asMap();
        System.out.println(map);
        int i = 1 / 0;
        return "hello controller advice";
    }

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class Book extends BaseEntity {
    private String name;
    private Long price;
}
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class Author  extends BaseEntity {
    private String name;
    private Long price;
}

@PostMapping("/book")
public void addBook(Book book, Author author) {
    System.out.println(book);
    System.out.println(author);
}

@PostMapping("/book")
public void addBook(@ModelAttribute("b") Book book, @ModelAttribute("a") Author author) {
    System.out.println(book);
    System.out.println(author);
}

@InitBinder("b")
public void b(WebDataBinder binder) {
    binder.setFieldDefaultPrefix("b.");
}
@InitBinder("a")
public void a(WebDataBinder binder) {
    binder.setFieldDefaultPrefix("a.");
}