springboot + @ControllerAdvice + @ExceptionHandler 实现全局异常拦截

1.目的:实现全局异常拦截,不用在controller在写try catch,使用代码看起来更加整洁

2.不啰嗦直接上代码

2.1首先我们创建一个异常捕获处理类(@RestControllerAdvice = @ControllerAdvice + @ResponseBody)

@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {

    /**
     * 处理 Exception 异常
     *
     * @parame
     * @param e                  异常
     * @return
     */
    @ExceptionHandler(value = Exception.class)
    public ResponseEntity exceptionHandler(Exception e) {
        log.error("服务错误:", e);
        return  ResponseEntity.fail(200, "服务出错");
    }

    /**
     * 处理 BusinessException 异常
     *
     * @param  e
     * @param e                  异常
     * @return
     */
    @ExceptionHandler(value = QDSException.class)
    public ResponseEntity businessExceptionHandler(QDSException e) {
        log.error("业务异常。code:" + e.getCode() + "msg:" + e.getMsg());
        return  ResponseEntity.fail(e.getCode(), e.getMsg());
    }
}

2.2 扩展一下 @RestControllerAdvice还可以指定拦截哪些

2.3创建一个异常返回的实体bean

@Data
public class ResponseEntity implements Serializable {
    private Integer code;
    private String msg;
    private Object data;

    public ResponseEntity() {
    }


    public ResponseEntity(Integer code, String msg, Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    public ResponseEntity( String msg,Object data) {
        this.msg = msg;
        this.data = data;
    }
    public ResponseEntity( Integer code,String msg) {
        this.code = code;
        this.msg = msg;
    }

    public static ResponseEntity success(String msg,String data) {
        return SUCCESS(msg,data);
    }
    public static ResponseEntity fail(Integer code,String msg) {
        return FAIL(code,msg);
    }

    public static ResponseEntity SUCCESS(String msg,Object data) {
        return new ResponseEntity(msg,data);
    }
    public static ResponseEntity FAIL(Integer code,String msg) {
        return new ResponseEntity(code,msg);
    }
}

2.3创建一个自定义异常类

@Data
public class QDSException extends RuntimeException {
    private Integer code;
    private String msg;
    private Object data;

    public QDSException(String msg) {
        this.msg= msg;
    }
    public QDSException(Integer code,String msg) {
        this.code = code;
        this.msg= msg;
    }

    public QDSException(Integer code, String msg, Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
}

2.4 接下来我们postman测试一下就可以了

@RestController
public class MyController {

    @RequestMapping(value = "/test2")
    public ResponseEntity test2() {
        throw  new QDSException(5005,"错误");
    }
}

2.5 如果我们抛出没有拦截的异常打印出堆栈信息