{
  "code": 0,
  "data": {},
  "msg": "操作成功"
}

//可以使Spring自動(dòng)把要返回的對(duì)象轉(zhuǎn)化成json文本寫入到響應(yīng)體中，比如自定義的ResultBean
@ResponseBody
@ControllerAdvice
public class MyGlobalExceptionHandler 
{
    // 專門用來捕獲和處理Controller層的異常
    @ExceptionHandler(Exception.class)
    public ModelAndView customException(Exception e) 
    {
        ModelAndView mv = new ModelAndView();
        mv.addObject("message", e.getMessage());
        mv.setViewName("myerror");
        return mv;
    }
    // 專門用來捕獲和處理Controller層的空指針異常
    @ExceptionHandler(NullPointerException.class)
    public ModelAndView nullPointerExceptionHandler(NullPointerException e)
    {
        ModelAndView mv = new ModelAndView(new MappingJackson2JsonView());
        mv.addObject("success",false);
        mv.addObject("mesg","請(qǐng)求發(fā)生了空指針異常，請(qǐng)稍后再試");
        return mv;
   }
}

@RestController
public class ExceptionRest {
    @GetMapping("getNullPointerException")
    public Map<String,Object> getNullPointerException(){
        throw new NullPointerException("出現(xiàn)了空指針異常");
    }
}

@RestController
public class ExceptionRest {
    private Logger log = LoggerFactory.getLogger(ExceptionRest.class);
    @GetMapping("getNullPointerException")
    public Map<String,Object> getNullPointerException(){
        Map<String,Object> returnMap = new HashMap<String,Object>();
        try{
            throw new NullPointerException("出現(xiàn)了空指針異常");
        }catch(NullPointerException e){
            log.error("出現(xiàn)了空指針異常",e);
            returnMap.put("success",false);
            returnMap.put("mesg","請(qǐng)求發(fā)生異常，請(qǐng)稍后再試");
        }
        return returnMap;
    }
}

{
  success: false,
  mesg: "請(qǐng)求發(fā)生異常，請(qǐng)稍后再試"
}

@ControllerAdvice
public class ExceptionConfigController {
    @ExceptionHandler
    public ModelAndView exceptionHandler(Exception e){
        ModelAndView mv = new ModelAndView(new MappingJackson2JsonView());
        mv.addObject("success",false);
        mv.addObject("mesg","請(qǐng)求發(fā)生了異常，請(qǐng)稍后再試");
        return mv;
    }
}

{
success: false,
mesg: "請(qǐng)求發(fā)生了異常，請(qǐng)稍后再試"
}

@RestController
public class ExceptionController {
 
    @GetMapping("getNullPointerException")
    public Map<String, Object> getNullPointerException() {
        throw new NullPointerException("出現(xiàn)了空指針異常");
    }
 
    @GetMapping("getClassCastException")
    public Map<String, Object> getClassCastException() {
        throw new ClassCastException("出現(xiàn)了類型轉(zhuǎn)換異常");
    }
 
    @GetMapping("getIOException")
    public Map<String, Object> getIOException() throws IOException {
        throw new IOException("出現(xiàn)了IO異常");
    }
}

@ControllerAdvice
public class ExceptionConfigController 
{
    // 專門用來捕獲和處理Controller層的空指針異常
    @ExceptionHandler(NullPointerException.class)
    public ModelAndView nullPointerExceptionHandler(NullPointerException e){
        ModelAndView mv = new ModelAndView(new MappingJackson2JsonView());
        mv.addObject("success",false);
        mv.addObject("mesg","請(qǐng)求發(fā)生了空指針異常，請(qǐng)稍后再試");
        return mv;
    }
 
    // 專門用來捕獲和處理Controller層的運(yùn)行時(shí)異常
    @ExceptionHandler(RuntimeException.class)
    public ModelAndView runtimeExceptionHandler(RuntimeException e){
        ModelAndView mv = new ModelAndView(new MappingJackson2JsonView());
        mv.addObject("success",false);
        mv.addObject("mesg","請(qǐng)求發(fā)生了運(yùn)行時(shí)異常，請(qǐng)稍后再試");
        return mv;
    }
 
    // 專門用來捕獲和處理Controller層的異常
    @ExceptionHandler(Exception.class)
    public ModelAndView exceptionHandler(Exception e){
        ModelAndView mv = new ModelAndView(new MappingJackson2JsonView());
        mv.addObject("success",false);
        mv.addObject("mesg","請(qǐng)求發(fā)生了異常，請(qǐng)稍后再試");
        return mv;
    }
}

{
success: false,
mesg: "請(qǐng)求發(fā)生了空指針異常，請(qǐng)稍后再試"
}

{
success: false,
mesg: "請(qǐng)求發(fā)生了運(yùn)行時(shí)異常，請(qǐng)稍后再試"
}

{
success: false,
mesg: "請(qǐng)求發(fā)生了異常，請(qǐng)稍后再試"
}

/**
*   自定義異常的步驟：
*  （1）繼承 Exception 或 RuntimeException
*  （2）定義構(gòu)造方法
*/
public class CustomUserException extends RuntimeException {
    private Integer code;
    public CustomUserException(UserResponseEnum userResponseEnum){
        super(userResponseEnum.getDescription());
        this.code = userResponseEnum.getCode();
    }
    public Integer getCode() {
        return code;
    }
}

public enum UserResponseEnum {
    USER_NOT_FOUND(50001,"用戶不存在"),
    USER_AUTHENTICATION_ERROR(50002,"用戶密碼不正確");
    private Integer code;
    private String description;
    UserResponseEnum(Integer code, String description) {
        this.code = code;
        this.description = description;
    }
    public Integer getCode() {
        return code;
    }
    public void setCode(Integer code) {
        this.code = code;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }

@RestController
@ControllerAdvice(basePackages = {"com.hs.controller"})
public class CustomExceptionAdvice 
{
    private static final Logger logger = LoggerFactory.getLogger(CustomExceptionAdvice.class);
    /**
     * 處理與用戶相關(guān)的業(yè)務(wù)異常
     * @return
     */
    @ExceptionHandler(CustomUserException.class)
    public BaseResult UserExceptionHandler(HttpServletRequest request,CustomUserException e){
        logger.error("用戶信息異常：Host:{} invoke URL:{},錯(cuò)誤信息：{}",request.getRemoteHost(),request.getRequestURL(),e.getMessage());
        return new BaseResult(e.getCode(),false,e.getMessage());
    }
}
 

	/**
     * 根據(jù)主鍵獲取用戶實(shí)體
     * @param id
     * @return
     */
    public User selectById(String id) 
    {
        User user = userMapper.selectByPrimaryId(id);
        if (user == null) {
            throw new CustomUserException(UserResponseEnum.USER_NOT_FOUND);
        }
        return user;
    }