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:
源码下载 :大老杨码云
个人网站:https://dalaoyang.cn