SpringBoot 统一处理异常

前言

当项目出错时，如何统一处理异常。

1、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 http://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>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.huzh</groupId>
    <artifactId>springboot-error</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>springboot-error</name>
    <description>springboot-error</description>

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

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

        <!-- 调试热启动 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

2、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();
    }
}

3、访问项目，分析结果

访问http://localhost:8080/aa, 如下

图片.png

访问http://localhost:8080/test, 如下

图片.png

4、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";
    }
}

图片.png