package com.**.commons.config.web;

import java.util.List;

import org.springframework.http.HttpStatus;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import com.**.commons.dto.Result;
import com.**.commons.exception.***;
import com.**.commons.exception.ErrorResultCode;
import com.**.commons.log.Marker;

import lombok.extern.slf4j.Slf4j;

/**
 * ClassName: MyExceptionHandler
 * Function: 全域性異常返回處理類
 * date: 
 * @author **
 * @version
 * @since JDK 1.8
 */
@Slf4j
@RestControllerAdvice(basePackages = {"com.**"})
public class MyExceptionHandler
{

    /**
     * ***
     */
    @ResponseBody
    @ExceptionHandler({***.class})
    @ResponseStatus(HttpStatus.OK)
    public Result<Object> ***Handler(*** e) {
    log.error(Marker.ERROR + e.getMessage() + ":{}", e);
    return new Result<>(e.getResultCode().getErrorCode(), e.getResultCode().getError());
}

    /**
     * MissingServletRequestParameterException
     */
    @ResponseBody
    @ExceptionHandler({MissingServletRequestParameterException.class})
    @ResponseStatus(HttpStatus.OK)
    public Result<Object> missingServletRequestParameterExceptionHandler(MissingServletRequestParameterException e) {
        log.error(Marker.ERROR + e.getMessage() + ":{}", e);
        return new Result<>(ErrorResultCode.PARAM_REQUIRED.getErrorCode(), String.format(ErrorResultCode.PARAM_REQUIRED.getError(), e.getParameterName()));
    }

    /**
     * MethodArgumentNotValidException
     */
    @ResponseBody
    @ExceptionHandler({MethodArgumentNotValidException.class})
    @ResponseStatus(HttpStatus.OK)
    public Result<Object> methodArgumentNotValidExceptionHandler(MethodArgumentNotValidException e) {
        log.error(Marker.ERROR + e.getMessage() + ":{}", e);
        return new Result<>(ErrorResultCode.PARAM_REQUIRED.getErrorCode(), String.format(ErrorResultCode.PARAM_REQUIRED.getError(), getBindingResultErrors(e.getBindingResult())));
    }

    /**
     * MethodArgumentNotValidException
     */
    @ResponseBody
    @ExceptionHandler({HttpMediaTypeNotSupportedException.class})
    @ResponseStatus(HttpStatus.OK)
    public Result<Object> httpMediaTypeNotSupportedExceptionHandler(HttpMediaTypeNotSupportedException e) {
        log.error(Marker.ERROR + e.getMessage() + ":{}", e);
        return new Result<>(ErrorResultCode.REQUEST_TYPE_ERROR.getErrorCode(), ErrorResultCode.REQUEST_TYPE_ERROR.getError());
    }

    /**
     * RuntimeException
     */
    @ResponseBody
    @ExceptionHandler({RuntimeException.class})
    @ResponseStatus(HttpStatus.OK)
    public Result<Object> runtimeExceptionHandler(RuntimeException e) {
        log.error(Marker.ERROR + e.getMessage() + ":{}", e);
        return new Result<>(ErrorResultCode.SYSTEM_ERROR.getErrorCode(), e.getClass().getName());
    }

    /**
     * Exception
     */
    @ResponseBody
    @ExceptionHandler({Exception.class})
    @ResponseStatus(HttpStatus.OK)
    public Result<Object> exceptionHandler(Exception e) {
        log.error(Marker.ERROR + e.getMessage() + ":{}", e);
        return new Result<>(ErrorResultCode.SYSTEM_ERROR.getErrorCode(), e.getClass().getName());
    }


    /**
     * 獲取valid提示
     */
    private String getBindingResultErrors(BindingResult bindingResult) {
        StringBuilder sb = new StringBuilder();
        if (bindingResult.hasErrors()) {
            List<ObjectError> list = bindingResult.getAllErrors();
            for (ObjectError error : list) {
                sb.append(error.getDefaultMessage() + ",");
            }
        }
        return sb.toString();
    }

}

部分欄位說明：
 

        *** 表示自定義異常類
        Result 表示自定義返回結構
        ErrorResultCode 表示自定義異常返回資訊類
        @ControllerAdvice/@RestControllerAdvice是controller的一個輔助類，最常用的就是作為全域性異常處理的切面類
        @ControllerAdvice/@RestControllerAdvice可以指定掃描範圍,即@RestControllerAdvice(basePackages = {"com.**"})

Marker是自定義列印日誌標記，列如：
public class Marker {
    public static final String ARROW = ">>>>>>";
    public static final String EQUAL = "======";
    public static final String QUESTION = "??????";
    public static final String EXCLAMATION = "!!!!!!";
    public static final String DEBUG = ">>>>>>";
    public static final String INFO = "======";
    public static final String WARN = "??????";
    public static final String ERROR = "!!!!!!";
    public static final String API_ERROR = "········";
    public static final String DEFAULT = "======";

    public Marker() {
    }
}