在springboot项目,报错有着默认的提示,这篇文章介绍一下如何统一处理异常。
新建项目,pom文件如下:
<?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> <groupId>com.dalaoyang</groupId> <artifactId>springboot_error</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot_error</name> <description>springboot_error</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <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>
创建一个IndexController,里面写两个方法,index方法正常跳转,test方法是故意写的一个nullpoint的错误的方法。 代码如下:
package com.dalaoyang.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.Map; /** * @author dalaoyang * @Description * @project springboot_learn * @package com.dalaoyang.Controller * @email yangyang@dalaoyang.cn * @date 2018/4/28 */ @RestController public class IndexController { @RequestMapping("/") public String index(){ return "index"; } @RequestMapping("/test") public String test(){ Map map = null; return map.toString(); } }
启动项目访问http://localhost:8080/,如下图,没有任何问题
然后随便访问一个项目里没有的地址,比如http://localhost:8080/aaa,如下图所示,404没有找到:
访问http://localhost:8080/test,如下图500错误:
从图上可以看到,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,代码如下:
package com.dalaoyang.Controller; import org.springframework.boot.autoconfigure.web.ErrorController; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * @author dalaoyang * @Description * @project springboot_learn * @package com.dalaoyang.Controller * @email yangyang@dalaoyang.cn * @date 2018/4/28 */ @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"; } }
重启项目,在访问http://localhost:8080/aaa和http://localhost:8080/test就都返回“error”字符串了,如下:
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