【第19章】spring-mvc之全局异常处理-编程知识

【第19章】spring-mvc之全局异常处理

文章目录

前言
一、全局异常处理
- 1. 前端
- 2. 后端
二、常见错误页
- 1.增加界面
- 2.web.xml
- 3.异常处理
- 4.效果
总结

前言

例如：随着人工智能的不断发展，机器学习这门技术也越来越重要，很多人都开启了学习机器学习，本文就介绍了机器学习的基础内容。

一、全局异常处理

1. 前端

<%--Created by IntelliJ IDEA.User: 张军国001Date: 2024/5/5Time: 11:15To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>未知的错误</title>
</head>
<body>
<p>错误码:${code}</p>
<p>错误信息:${message}</p>
</body>
</html>

2. 后端

全局异常处理

package org.example.springmvc.exception;import com.alibaba.fastjson2.support.spring6.webservlet.view.FastJsonJsonView;
import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.log4j.Log4j2;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.ModelAndView;
import java.io.PrintWriter;
import java.io.StringWriter;/*** Create by zjg on 2024/5/5*/
@ControllerAdvice
@Log4j2
public class GlobalExceptionHandler {@ExceptionHandler(Exception.class)public ModelAndView exception(HttpServletRequest request,Exception exception){trace(exception);ModelAndView modelAndView ;String accept = request.getHeader("accept");if(accept.contains("application/json")){modelAndView=new ModelAndView(new FastJsonJsonView());}else{modelAndView = new ModelAndView("params/error");}modelAndView.addObject("code", HttpStatus.INTERNAL_SERVER_ERROR.value());modelAndView.addObject("message",exception.getMessage());return modelAndView;}private void trace(Exception exception){StringWriter stringWriter = new StringWriter();PrintWriter writer=new PrintWriter(stringWriter);exception.printStackTrace(writer);log.error(stringWriter);}
}

异常类

package org.example.springmvc.exception;import com.alibaba.fastjson2.JSONObject;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;/*** Create by zjg on 2024/5/5*/
@Controller
public class ExceptionController {@RequestMapping("/error01")public JSONObject error01(){int i=1/0;return new JSONObject();}@RequestMapping("/error02")public String error02(){int i=1/0;return "params/error";}
}

二、常见错误页

1.增加界面

在这里插入图片描述

2.web.xml

<error-page><error-code>400</error-code><location>/resources/error/400.html</location>
</error-page>
<error-page><error-code>404</error-code><location>/resources/error/404.html</location>
</error-page>

3.异常处理

@ExceptionHandler(HttpMessageNotReadableException.class)
public ModelAndView exception(NoResourceFoundException exception){trace(exception);ModelAndView modelAndView = new ModelAndView();modelAndView.addObject("code", HttpStatus.BAD_REQUEST.value());modelAndView.addObject("message",exception.getMessage());return modelAndView;
}
@ExceptionHandler(NoResourceFoundException.class)
public ModelAndView noResourceFoundException(NoResourceFoundException exception){trace(exception);ModelAndView modelAndView = new ModelAndView();modelAndView.addObject("code", HttpStatus.NOT_FOUND.value());modelAndView.addObject("message",exception.getMessage());return modelAndView;
}