在開發(fā)中，如果用try catch的方式，每個(gè)方法都需要單獨(dú)實(shí)現(xiàn)，為了方便分類異常，返回給前端，采用了@ControllerAdvice注解和繼承了RuntimeException的方式來(lái)實(shí)現(xiàn)，具體實(shí)現(xiàn)內(nèi)容跟隨小編一起看看吧

背景

在開發(fā)中，如果用try catch的方式，每個(gè)方法都需要單獨(dú)實(shí)現(xiàn)，為了方便分類異常，返回給前端，采用了@ControllerAdvice注解和繼承了RuntimeException的方式來(lái)實(shí)現(xiàn)。

實(shí)現(xiàn)內(nèi)容

捕獲了三類異常
1.業(yè)務(wù)異常

BusinessException

2.系統(tǒng)異常

SystemException

3.其他異常

利用@ExceptionHandler(RuntimeException.class)去捕獲

ExceptionAdvice類捕獲以上三類異常，并返回自定義類型格式數(shù)據(jù)

實(shí)現(xiàn)代碼

業(yè)務(wù)異常BusinessException類實(shí)現(xiàn)方式，繼承RuntimeException

public class BusinessException extends  RuntimeException {
	/**
	 * 錯(cuò)誤編碼
	 */
	private String code;
 
	public BusinessException() {
		super();
	}
 
	public BusinessException(String message) {
		super(message);
	}
 
	public BusinessException(String code, String message) {
		super(message);
		this.code = code;
	}
 
	public BusinessException(Throwable cause) {
		super(cause);
	}
 
	public BusinessException(String message, Throwable cause) {
		super(message, cause);
	}
 
	public BusinessException(String message, Throwable cause,
							 boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
	}
 
	public String getCode() {
		return code;
	}
 
	public void setCode(String code) {
		this.code = code;
	}
 
	@Override
	public String getMessage() {
		return super.getMessage();
	}
 
	@Override
	public String toString() {
		return this.code + ":" + this.getMessage();
	}
}

系統(tǒng)異常SystemException類實(shí)現(xiàn)方式，繼承RuntimeException，同業(yè)務(wù)異常類的實(shí)現(xiàn)方式一樣

public class SystemException extends  RuntimeException {
	/**
	 * 錯(cuò)誤編碼
	 */
	private String code;
 
	public SystemException() {
		super();
	}
 
	public SystemException(String message) {
		super(message);
	}
 
	public SystemException(String code, String message) {
		super(message);
		this.code = code;
	}
 
	public SystemException(Throwable cause) {
		super(cause);
	}
 
	public SystemException(String message, Throwable cause) {
		super(message, cause);
	}
 
	public SystemException(String message, Throwable cause,
                           boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
	}
 
	public String getCode() {
		return code;
	}
 
	public void setCode(String code) {
		this.code = code;
	}
 
	@Override
	public String getMessage() {
		return super.getMessage();
	}
 
	@Override
	public String toString() {
		return this.code + ":" + this.getMessage();
	}
}

ExceptionAdvice類，采用增強(qiáng)Controller注解 @ControllerAdvice的方式來(lái)實(shí)現(xiàn)

1.方法名稱和返回類型都可以根據(jù)自己需要定義；

2.采用注解@ExceptionHandler，就是捕獲的異常類型，我們只需要把需要捕獲異常類型寫進(jìn)來(lái)就好

ExceptionAdvice 具體代碼實(shí)現(xiàn)如下：

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
 
@ControllerAdvice
public class ExceptionAdvice {
    public static Logger logger = LoggerFactory.getLogger(ExceptionAdvice.class);
 
    @ResponseBody
    @ExceptionHandler(SystemException.class)
    public Result handleException(Exception e) {
        logger.error("系統(tǒng)異常信息：", e);
        Result result = new Result();
        if (e instanceof BusinessException) {
            e = (BusinessException) e;
            result.setCode(((BusinessException) e).getCode());
        }
        result.setFailed(e.getMessage());
        return result;
    }
 
    @ExceptionHandler(RuntimeException.class)
    @ResponseBody
    public Result handleException(RuntimeException e) {
        logger.error("異常信息：", e.getMessage());
        Result result = new Result();
        result.setStatus(500);
        result.setMessage(e.getMessage());
        return result;
    }
 
    @ExceptionHandler(BusinessException.class)
    @ResponseBody
    public AjaxJson doBusinessException(Exception e) {
        AjaxJson ajaxJson = new AjaxJson();
        logger.error("業(yè)務(wù)異常消息：", e.getMessage());
        ajaxJson.setRet(-1);
        ajaxJson.setMsg(e.getMessage());
        return ajaxJson;
    }
 
}