spring boot: GlobalDefaultExceptionHandler方法内的友好错误提示,全局异常捕获
当你的某个控制器内的某个方法报错，基本上回显示出java错误代码，非常不友好，这个时候可以通过新建GlobalDefaultExceptionHandler.java文件,
package com.muyang.boot22.config; import javax.servlet.http.HttpServletRequest; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.ResponseBody; @ControllerAdvice public class GlobalDefaultExceptionHandler { @ExceptionHandler(Exception.class) @ResponseBody public String defaultExceptionHandler(HttpServletRequest req,Exception e){ //是返回的String. //ModelAndView -- 介绍 模板引擎...? // ModelAndView mv = new ModelAndView(); // mv.setViewName(viewName); return "对不起，服务器繁忙，请稍后再试！"; } }
参考项目：
pom.xml参考代码
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <!-- spring mvc,aop,restful,fastjson --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <!-- tomcat的支持 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.15</version> </dependency> <!-- 热部署 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> <scope>true</scope> </dependency> </dependencies> <build> <plugins> <!-- 热部署 --> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <!--fork : 如果没有该项配置，呢个devtools不会起作用，即应用不会restart --> <fork>true</fork> </configuration> </plugin> </plugins> </build>
App.java参考代码
package com.muyang.boot22; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.autoconfigure.web.HttpMessageConverters; import org.springframework.context.annotation.Bean; import org.springframework.http.converter.HttpMessageConverter; import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.support.config.FastJsonConfig; import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; /** * Hello world! * */ @SpringBootApplication public class App { //fastJson配置 @Bean public HttpMessageConverters fastJsonHttpMessageConverters() { FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); FastJsonConfig fastJsonConfig = new FastJsonConfig(); fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat); fastConverter.setFastJsonConfig(fastJsonConfig); HttpMessageConverter<?> converter = fastConverter; return new HttpMessageConverters(converter); } public static void main( String[] args ) { //System.out.println( "Hello World!" ); SpringApplication.run(App.class, args); } }
HelloController.java样例
package com.muyang.boot22.controller; import java.util.Map; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class HelloController { @RequestMapping("/hello") public void index(Map<String, Object>map) { //map.put("name", "张三"); //return "hello"; int i = 1024/0; } }
运行App.java
原文：https://www.cnblogs.com/achengmu/p/9370904.html