JAVA项目中自定义异常
1.数据返回处理类
@Data
public class R<T> implements Serializable {
private static final long serialVersionUID = -8497670085742879369L;
@ApiModelProperty(value = "返回码", example = "200")
private Integer code=200;
@ApiModelProperty(value = "返回消息", example = "")
private String message="SUCCESS";
@ApiModelProperty(value = "返回数据", example = "")
private T data;
private R() {
}
public R(T data) {
this.data = data;
}
public R(Integer code,String message) {
this.code=code;
this.message = message;
}
}
2.新建自定义异常
@Data
@AllArgsConstructor
@NoArgsConstructor
public class GuliException extends RuntimeException{
private Integer code;
private String msg;
}
3.定义异常处理
@ControllerAdvice
public class GlobalExceptionHandler {
//指定出现什么异常执行这个方法
@ExceptionHandler(GuliException.class)
@ResponseBody //返回数据
public R error(GuliException e){
e.printStackTrace();
return new R(e.getCode(),e.getMsg());
}
}
4.不使用异常处理示例
@GetMapping("/testError")
@ApiOperation(value = "测试异常处理")
public R<UserVO> testError(@RequestParam("id") String id){
UserVO userVO=new UserVO();
SysUser byId = sysUserService.getById(id);
BeanUtils.copyProperties(byId,userVO);
return new R<>(userVO);
}
执行结果
使用自定义异常
@GetMapping("/testCheck")
@ApiOperation(value = "测试返回值正常处理")
public R<Boolean> testCheck(){
try {
int i=10/0;
}catch (Exception e){
e.printStackTrace();
throw new GuliException(1001,"错误测试");
}
return new R<>(true);
}
执行结果
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