一、环境

Idea 2020.1
JDK 1.8
maven

二、目的

spring boot 异常处理controller实现方式。

gitHub地址： https://github.com/ouyushan/ouyushan-spring-boot-samples

三、步骤

3.1、点击File -> New Project -> Spring Initializer，点击next

3.2、选择Web依赖，选中Spring Web。可以选择Spring Boot版本，本次默认为2.2.6，点击Next

3.3、项目结构

四、添加文件

pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>org.ouyushan</groupId>
    <artifactId>spring-boot-error-controller</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-error-controller</name>
    <description>Error Controller project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.5.0</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

添加index.ftl

<!DOCTYPE html>
<html>
<head lang="en">
    <title>Spring Boot Demo - FreeMarker</title>

    <link href="/css/index.css" rel="stylesheet" />

</head>
<body>
<div style="text-align: center;">
    <img src="/images/springboot.jpg" />
    <h1 id="title">${title}</h1>
</div>

<script type="text/javascript" src="/webjars/jquery/3.5.0/jquery.min.js"></script>

<script>
    $(function(){
        $('#title').click(function(){
            alert('点击了');
        });
    })
</script>
</body>
</html>

添加index.css

h1{color: blue;}

配置文件application.properties

spring.freemarker.template-loader-path=classpath:/templates
spring.freemarker.suffix=.ftl

BaseErrorController.java

package org.ouyushan.springboot.error.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Description:
 * @Author: ouyushan
 * @Email: ouyushan@hotmail.com
 * @Date: 2020/5/7 13:51
 */

@Controller
@RequestMapping(value = "error")
public class BaseErrorController implements ErrorController {


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

    @Override
    public String getErrorPath() {
        logger.info("出错啦！进入自定义错误控制器");
        return "error/error";
    }

    @RequestMapping
    public String error() {
        return getErrorPath();
    }
}

UserController .java

package org.ouyushan.springboot.error.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Description:
 * @Author: ouyushan
 * @Email: ouyushan@hotmail.com
 * @Date: 2020/5/7 13:54
 */
@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/index")
    public String index(ModelMap map){
        map.put("title", "freemarker hello word");
        return "index"; // 开头不要加上/，linux下面会出错
    }

    @RequestMapping(value = "/error")
    public String error(ModelMap map) {
        throw new RuntimeException("测试异常");
    }
}