SpringBoot 全局异常错误页面（使用继承ErrorController方法）

SpringBoot 全局异常错误页面（使用继承ErrorController方法）

1. 建立项目，依赖Web 和 thymeleaf

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

2. 准备两个异常错误页面

在template中建立error文件夹，在error文件夹中建立4xx.html 和 5xx.html

3.准备自定义错误处理类

com.zhl.springbootexceptionjunit.controller.MyBasicErrorController

• SpringBoot 出现异常时会查找 /error 视图， 若是没有则会根据错误码查找对应 error/400.html 之类的错误静态页面
• 此处重写ErrorController，实现/error 视图，根据错误类型，跳转至对应的视图，因为使用视图技术，需引用模板引擎（本例用thymeleaf）

 

package com.zhl.springbootexceptionjunit.controller;

import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.context.request.WebRequest;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * 定制ErrorController，目的是能使SpringBoot找到本身定制的错误页面
 * 大部分的代码BasicController一致，关键点是修改错误页面的路径
 */
@Controller
@RequestMapping(value = "/error")
public class MyBasicErrorController implements ErrorController {


    @RequestMapping(produces = {"text/html"})//返回给浏览器
    public String handlerError(HttpServletRequest request, Model model){
        WebRequest webRequest = new ServletWebRequest(request);//对request进行包装，目的是能操做更多的方法
        HttpStatus status = this.getStatus(request);//获取status

        String path = (String) webRequest.getAttribute("javax.servlet.error.request_uri", 0);
        String message = (String) webRequest.getAttribute("javax.servlet.error.message", 0);
        if(message.equals("")){
            message = "No Available Message";
        }

        //携带错误数据信息
        model.addAttribute("timestamp", new Date());
        model.addAttribute("statusCode", status.value());
        model.addAttribute("error", status.getReasonPhrase());
        model.addAttribute("message", message);
        model.addAttribute("path", path);

        int i = status.value() / 100;//判断是4xx仍是5xx错误
        if(i == 4){
            return "error/4xx";//使用本身定制的错误页面
        }else if(i == 5){
            return "error/5xx";//使用本身定制的错误页面
        }
        return null;
    }

    @RequestMapping//返回给客户端
    public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
        WebRequest webRequest = new ServletWebRequest(request);//对request进行包装，目的是能操做更多的方法
        HttpStatus status = this.getStatus(request);//获取status
        Map<String, Object> map = new HashMap<>();

        if (status == HttpStatus.NO_CONTENT) {
            return new ResponseEntity(status);
        } else {

            String path = (String) webRequest.getAttribute("javax.servlet.error.request_uri", 0);
            String message = (String) webRequest.getAttribute("javax.servlet.error.message", 0);

            map.put("timestamp", new Date());
            map.put("statusCode", status.value());
            map.put("error", status.getReasonPhrase());
            map.put("message", message);
            map.put("path", path);

            return new ResponseEntity(map, status);
        }
    }



    protected HttpStatus getStatus(HttpServletRequest request) {
        Integer statusCode = (Integer)request.getAttribute("javax.servlet.error.status_code");
        if (statusCode == null) {
            return HttpStatus.INTERNAL_SERVER_ERROR;
        } else {
            try {
                return HttpStatus.valueOf(statusCode);
            } catch (Exception var4) {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }
        }
    }

    @Override
    public String getErrorPath() {
        return "null";
    }
}

4.测试 代码

com.zhl.springbootexceptionjunit.controller.UsersController

@Controller
public class UsersController {
    @RequestMapping("showinfo")
    public String showinfo(){
        String str=null;
        str.length();
        return "ok";
    }
}

测试1，运行时错误：

测试2：无资源的状况

 

参考： https://blog.csdn.net/qq_40634846/article/details/107710404