背景
在开发中，如果用try catch的方式，每个方法都需要单独实现，为了方便分类异常，返回给前端，采用了@ControllerAdvice注解和继承了RuntimeException的方式来实现。
实现内容
捕获了三类异常
1.业务异常
BusinessException
2.系统异常
SystemException
3.其他异常
利用@ExceptionHandler(RuntimeException.class)去捕获
ExceptionAdvice类捕获以上三类异常，并返回自定义类型格式数据
实现代码
业务异常BusinessException类实现方式，继承RuntimeException
public class BusinessException extends RuntimeException {
/**
* 错误编码
*/
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();
}
}
系统异常SystemException类实现方式，继承RuntimeException，同业务异常类的实现方式一样
public class SystemException extends RuntimeException {
/**
* 错误编码
*/
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类，采用增强Controller注解 @ControllerAdvice的方式来实现
1.方法名称和返回类型都可以根据自己需要定义；
2.采用注解@ExceptionHandler，就是捕获的异常类型，我们只需要把需要捕获异常类型写进来就好
ExceptionAdvice 具体代码实现如下：
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("系统异常信息：", 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("异常信息：", 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("业务异常消息：", e.getMessage());
ajaxJson.setRet(-1);
ajaxJson.setMsg(e.getMessage());
return ajaxJson;
}
}
测试代码
1.我们捕获一个业务异常BusinessException，输出aaa
2.捕获系统异常
throw new SystemException("aaaa");
3.其他的try catch的异常，这个就可以捕获了
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