spring-boot异常处理-蒲公英云

spring-boot异常处理

迷南。 2024-02-19 21:57 189阅读 0赞

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Spring-boot异常处理
如果你在src/main/resource/templates目录下新建了error.html。那么当服务器出现异常的时候都会跳转到error.html。但是这样的方法，不适合我们开发
讲下另外一种方法
1.配置依pom.xml

<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>1.5.10.RELEASE</version>
  </parent>
  <groupId>com.bjsxt</groupId>
  <artifactId>18-spring-boot-exception5</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <properties>
  <java.version>1.7</java.version>
  <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
  <thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.version>
  </properties>
  <dependencies>
      <!-- springBoot的启动器 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- springBoot的启动器 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
  </dependencies>
</project>

2.在启动器的子目录下新建Exception类，类实现HandlerExceptionResolver接口。重写resolveException方法

package cn.zds.ecception;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;
/**
 * 通过实现HandlerExceptionResolver接口做全局异常处理
 *
 *
 */
@Configuration//标记异常处理类
public class GlobalException implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
            Exception ex) {
        ModelAndView mv = new ModelAndView();
        //判断不同异常类型，做不同视图跳转
        if(ex instanceof ArithmeticException){//如果是算术异常
            mv.setViewName("error1");//设置ModelAndView的跳转路径视图（error1.html）
        }
        if(ex instanceof NullPointerException){//空指针异常
            mv.setViewName("error2");设置ModelAndView的跳转路径视图（error2.html）
        }
        mv.addObject("error", ex.toString());//将异常对象添加到ModelAndView
        return mv;
    }
}

3.在视图中可输出异常信息

error1.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
出错了  1
<span th:text="${error}"></span>
</body>
</html>

error2.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
出错了  2
<span th:text="${error}"></span>
</body>
</html>

4.启动器App.java：

package cn.zds;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
 * 
 *SpringBoot处理异常方式一：自定义错误页面
 *
 */
@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

5.测试：
编写controller

package cn.zds.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class ExceptionController {
    //除0错误
    @RequestMapping("error1")
    public String error1(){
        int a=10/0;
        return "add";
    }
    //空指针错误
        @RequestMapping("error2")
        public String error2(){
            String string=null;
            string.contains("aa");
            return "add";
        }
}