个人博客系统的设计与实现（十九）——异常和日志

一、NotFoundException

新建一个异常类继承于RuntimeException，用于处理各种找不到时的异常

二、ControllerExceptionHandler

发生异常时的拦截器，转发异常信息到指定错误页面

三、IndexController

首页的Controller，定义一个GetMapping测试异常，这里没有导入页面不进行测试了，之后导入页面后再进行测试

四、日志配置

代码

1.NotFoundException.java

package com.jx;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(HttpStatus.NOT_FOUND)
public class NotFoundException extends RuntimeException {

    public NotFoundException() {
    }

    public NotFoundException(String message) {
        super(message);
    }

    public NotFoundException(String message, Throwable cause) {
        super(message, cause);
    }
}

2.ControllerExceptionHandler.java

package com.jx.handler;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice
public class ControllerExceptionHandler {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());


    @ExceptionHandler(Exception.class)
    public ModelAndView exceptionHander(HttpServletRequest request, Exception e) throws Exception {
        logger.error("Requst URL : {}，Exception : {}", request.getRequestURL(), e);

        if (AnnotationUtils.findAnnotation(e.getClass(), ResponseStatus.class) != null) {
            throw e;
        }

        ModelAndView mv = new ModelAndView();
        mv.addObject("url", request.getRequestURL());
        mv.addObject("exception", e);
        mv.setViewName("error/error");
        return mv;
    }
}

3.IndexController.java

package com.jx.web;

import com.jx.NotFoundException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class IndexController {

    @GetMapping("/")
    public String index() {
        String blog = null;
        if (blog == null) {
            throw new NotFoundException("博客不存在");
        }
        return "index";
    }

    @GetMapping("/blog")
    public String blog() {
        return "blog";
    }

}

4.LogAspect.java

package com.jx.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;

@Aspect
@Component
public class LogAspect {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Pointcut("execution(* com.jx.web.*.*(..))")
    public void log() {
    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        String url = request.getRequestURL().toString();
        String ip = request.getRemoteAddr();
        String classMethod = joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName();
        Object[] args = joinPoint.getArgs();
        RequestLog requestLog = new RequestLog(url, ip, classMethod, args);
        logger.info("Request : {}", requestLog);
    }

    @After("log()")
    public void doAfter() {
//        logger.info("--------doAfter--------");
    }

    @AfterReturning(returning = "result", pointcut = "log()")
    public void doAfterRuturn(Object result) {
        logger.info("Result : {}", result);
    }

    private class RequestLog {
        private String url;
        private String ip;
        private String classMethod;
        private Object[] args;

        public RequestLog(String url, String ip, String classMethod, Object[] args) {
            this.url = url;
            this.ip = ip;
            this.classMethod = classMethod;
            this.args = args;
        }

        @Override
        public String toString() {
            return "{" +
                    "url='" + url + '\'' +
                    ", ip='" + ip + '\'' +
                    ", classMethod='" + classMethod + '\'' +
                    ", args=" + Arrays.toString(args) +
                    '}';
        }
    }

}

 

来源：CSDN

作者：XWGXF_JJX

链接：https://blog.csdn.net/XWGXF_JJX/article/details/103567564