SpringBoot-统一处理异常

前言

当系统发生时, spring boot会自动处理异常, 这里通过自定义统一处理异常进行处理。

pom.xml文件

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.6.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.huzhgroupId>
    <artifactId>springboot-errorartifactId>
    <version>1.0-SNAPSHOTversion>
    <name>springboot-errorname>
    <description>springboot-errordescription>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>
project>

创建一个IndexController类，定义一个正常方法和一个错误方法

@RestController
public class IndexController {

    @RequestMapping("/")
    public String indesx() {
        return "index";
    }

    @RequestMapping("/test")
    public String test() {
        Map map = null;
        return map.toString();
    }
}

访问项目，分析结果

1. 访问http://localhost:8080/aa, 如下
   

2. 访问http://localhost:8080/test, 如下
   

创建异常处理类CommonErrorController

从上图可以看到，springboot报错的时候都在找/error这个地址，这时我们新建一个CommonErrorController来统一处理异常，这个类实现了ErrorController。

@RestController
public class CommonErrorController implements ErrorController {

    private final String ERROR_PATH = "/error";

    @Override
    public String getErrorPath() {
        return ERROR_PATH;
    }

    @RequestMapping(value = ERROR_PATH)
    public String handleError() {
        System.out.println(getErrorPath());
        return "error";
    }
}