404错误

404错误是不经过Controller的，所以使用@ControllerAdvice或@RestControllerAdvice无法获取到404错误

springboot2处理404错误的两种方式

第一种：直接配置

#出现错误时, 直接抛出异常

spring.mvc.throw-exception-if-no-handler-found=true

这种方式不太适用实际开发，比如和swagger集成时，访问/swagger-ui.html会出现404异常

第二种：继承ErrorController来处理错误

import org.springframework.boot.web.servlet.error.ErrorController;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@Controller

public class MyErrorController implements ErrorController {

    @RequestMapping("/error")

    public String handleError(HttpServletRequest request){

        //获取statusCode:401,404,500

        Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");

        if(statusCode == 500){

            return "/error/500";

        }else if(statusCode == 404){

            //对应的是/error/404.html、/error/404.jsp等，文件位于/templates下面

            return "/error/404";

        }else if(statusCode == 403){

            return "/403";

        }else{

            return "/500";

        }

    }

    @Override

    public String getErrorPath() {

        return "/error";

    }

}

import com.bettn.common.util.Result;

import com.bettn.common.util.WebUtils;

import org.apache.shiro.ShiroException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.http.HttpStatus;

import org.springframework.web.bind.annotation.ExceptionHandler;

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

import org.springframework.web.bind.annotation.RestControllerAdvice;

import org.springframework.web.method.HandlerMethod;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.NoHandlerFoundException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

/**

 * 全局异常捕获处理

 */

@RestControllerAdvice

public class ExceptionControllerAdvice {

    private static final Logger logger= LoggerFactory.getLogger(ExceptionControllerAdvice.class);

    // 捕捉shiro的异常

    @ExceptionHandler(ShiroException.class)

    public Result handle401() {

        return new Result(401,"您没有权限访问！",null);

    }

    // 捕捉其他所有异常

    @ExceptionHandler(Exception.class)

    public Object globalException(HttpServletRequest request, HandlerMethod handlerMethod, Throwable ex) {

        if(WebUtils.isAjax(handlerMethod)){

            return new Result(getStatus(request).value(), "访问出错，无法访问: " + ex.getMessage(), null);

        }else {

            ModelAndView modelAndView = new ModelAndView();

            modelAndView.setViewName("/error/500"); //这里需要在templates文件夹下新建一个/error/500.html文件用作错误页面

            modelAndView.addObject("errorMsg",ex.getMessage());

            return modelAndView;

        }

    }

    /**

     * 判断是否是Ajax请求

     *

     * @param request

     * @return

     */

    public boolean isAjax(HttpServletRequest request) {

        return (request.getHeader("X-Requested-With") != null &&

                "XMLHttpRequest".equals(request.getHeader("X-Requested-With").toString()));

    }

//    @ExceptionHandler(Exception.class)

//    public Result globalException(HttpServletRequest request, Throwable ex) {

//        return new Result(getStatus(request).value(),"访问出错，无法访问: " + ex.getMessage(),null);

//    }

    /**

     * 获取响应状态码

     * @param request

     * @return

     */

    private HttpStatus getStatus(HttpServletRequest request) {

        Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");

        if (statusCode == null) {

            return HttpStatus.INTERNAL_SERVER_ERROR;

        }

        return HttpStatus.valueOf(statusCode);

    }

    /**

     * 捕捉404异常,这个方法只在配置

     * spring.mvc.throw-exception-if-no-handler-found=true来后起作用

     *

     */

    @ResponseStatus(HttpStatus.NOT_FOUND)

    @ExceptionHandler(NoHandlerFoundException.class)

    public Result handle(HttpServletRequest request,NoHandlerFoundException e) {

        System.out.println(12);

        return new Result(404,"没有【"+request.getMethod()+"】"+request.getRequestURI()+"方法可以访问",null);

    }

}

这个异常类与ExceptionControllerAdvice连用，ExceptionControllerAdvice类除了不能处理404异常以外，其他异常都可以处理，其中

globalException异常这个方法会捕获500错误，导致MyErrorController无法捕获到500错误，从而跳转到500页面,也就是说MyErrorController在这个项目中

只能捕获404异常

500异常捕获

500异常分为ajax和直接跳转500页面

具体的异常捕获，代码如何下：



// 捕捉其他所有异常

@ExceptionHandler(Exception.class)

public Object globalException(HttpServletRequest request, HandlerMethod handlerMethod, Throwable ex) {

    if(WebUtils.isAjax(handlerMethod)){

        return new Result(getStatus(request).value(), "访问出错，无法访问: " + ex.getMessage(), null);

    }else {

        ModelAndView modelAndView = new ModelAndView();

        modelAndView.setViewName("/error/500"); //这里需要在templates文件夹下新建一个/error/500.html文件用作错误页面

        modelAndView.addObject("errorMsg",ex.getMessage());

        return modelAndView;

    }

}

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.core.annotation.AnnotationUtils;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.method.HandlerMethod;

public class WebUtils extends org.springframework.web.util.WebUtils {

	/**

	 * 判断是否ajax请求

	 * spring ajax 返回含有 ResponseBody 或者 RestController注解

	 * @param handlerMethod HandlerMethod

	 * @return 是否ajax请求

	 */

	public static boolean isAjax(HandlerMethod handlerMethod) {

		ResponseBody responseBody = handlerMethod.getMethodAnnotation(ResponseBody.class);

		if (null != responseBody) {

			return true;

		}

		// 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类

		Class<?> beanType = handlerMethod.getBeanType();

		responseBody = AnnotationUtils.getAnnotation(beanType, ResponseBody.class);

		if (null != responseBody) {

			return true;

		}

		return false;

	}

	public static String getCookieValue(HttpServletRequest request, String cookieName) {

		Cookie cookie=getCookie(request, cookieName);

		return cookie==null?null:cookie.getValue();

	}

	public static void removeCookie(HttpServletResponse response, String cookieName) {

		setCookie(response, cookieName, null, 0);

	}

	public static void setCookie(HttpServletResponse response, String cookieName, String cookieValue,

			int defaultMaxAge) {

		Cookie cookie=new Cookie(cookieName,cookieValue);

		cookie.setHttpOnly(true);

		cookie.setPath("/");

		cookie.setMaxAge(defaultMaxAge);

		response.addCookie(cookie);

	}

}

TIP

404、500页面需要放在/templates下，且确认配置了视图，如jsp、thymeleaf等，否则也会出现找不到页面，例如集成thymeleaf

依赖

<!-- thymeleaf模板引擎和shiro框架的整合,这个是与shiro集成的，一般不整合shiro就不需要这个依赖 -->

<dependency>

    <groupId>com.github.theborakompanioni</groupId>

    <artifactId>thymeleaf-extras-shiro</artifactId>

    <version>${thymeleaf.extras.shiro.version}</version>

</dependency>

<!-- SpringBoot集成thymeleaf模板 -->

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

配置

spring:

  # 模板引擎

  thymeleaf:

    mode: HTML5

    encoding: utf-8

    # 禁用缓存

    cache: false

404、500页面地址(目录结构)

src/main/resources/templates/error/404.html

src/main/resources/templates/error/500.html

<!DOCTYPE HTML>

<html xmlns:th="http://www.thymeleaf.org">

<head>

    <title>500</title>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

</head>

<body>

<!--

直接使用${el}无法解析出el的值

${errorMsg}

-->

<h3>糟糕! 服务器出错啦~~(>_<)~~</h3>

<div>

    异常信息如下:<br/>

    <p th:text="${errorMsg}"></p>

</div>

</body>

</html>

参考：https://www.jianshu.com/p/8d41243e7fba

巴特西

springboot 2.x处理404、500等异常

404错误

第一种：直接配置

第二种：继承ErrorController来处理错误

500异常捕获

TIP

依赖

配置

404、500页面地址(目录结构)

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