springBoot配置全局异常处理器

一.自定义自己的异常类MyException.java

public class MyException extends RuntimeException {
    private int code;

    public MyException( int code, String message ) {
        super(message);
        this.code = code;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }
}

创建自定义异常类原因：java自己的异常类只有message参数，这里我们还需要一个code参数（用来记录请求状态）。并且创建自定义异常还能和系统异常区分开来。

二.统一异常返回格式Result.java

public class Result implements Serializable {
    private int code;
    private String msg;
    private Object data;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }
}

三.编写全局异常处理器MyExceptionHandle.java

@ControllerAdvice
public class MyExceptionHandle {
    private static final Logger logger = LoggerFactory.getLogger(MyExceptionHandle.class);

    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public Result handle(Exception e) {
        if(e instanceof MyException) {
            MyException myException = (MyException)e;
            return ResultUtil.error(myException.getCode(),myException.getMessage());
        }else{
            logger.error("系统异常",e);
            return ResultUtil.error(ResultEnum.UNKNOWN_ERROR.getCode(),ResultEnum.UNKNOWN_ERROR.getMsg());
        }
    }

}

四.其它类

ResultEnum.java：作用：规范错误码code极其具体表示含义。方便维护。

public enum ResultEnum {

    UNKNOWN_ERROR(500,"未知错误"),
    SUCCESS(200,"操作成功"),
    ERROR_1(111,"未成年1"),
    ERROR_2(112,"未成年2");

    private int code;
    private String msg;

    ResultEnum(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}

ResultUtil.java：作用：方便生成Result.java而已

public class ResultUtil {

    public static Result error(int code,String msg) {
        Result result = new Result();
        result.setCode(code);
        result.setMsg(msg);
        result.setData(null);
        return result;
    }

    public static Result success(Object obj) {
        Result result = new Result();
        result.setCode(200);
        result.setMsg("成功");
        result.setData(obj);
        return result;
    }

    public static Result success() {
        Result result = new Result();
        result.setCode(200);
        result.setMsg("成功");
        result.setData(null);
        return result;
    }

}

HelloController.java

@RestController
public class HelloController {

    @GetMapping("/aa")
    public Result aa(Girl girl) throws Exception {
        if(girl.getId() < 18) {
            throw new MyException(ResultEnum.ERROR_1.getCode(),ResultEnum.ERROR_1.getMsg());
        }else if(girl.getId() < 20) {
            throw new MyException(ResultEnum.ERROR_2.getCode(),ResultEnum.ERROR_2.getMsg());
        }
        return ResultUtil.success("aaa");
    }

}