目录
一、基于xml配置的异常处理
二、基于注解的异常处理
1.ControllerAdvice 源码
2.ExceptionHandler 源码
3.控制层方法
一、基于xml配置的异常处理
SpringMVC提供了一个处理控制器方法执行过程中所出现的异常的接口：HandlerExceptionResolver
HandlerExceptionResolver的源码
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package org.springframework.web.servlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.lang.Nullable;
public interface HandlerExceptionResolver {
@Nullable
ModelAndView resolveException
(HttpServletRequest var1,
HttpServletResponse var2,
@Nullable Object var3,
Exception var4);
}
HandlerExceptionResolver接口的实现类有：
- DefaultHandlerExceptionResolver
- SimpleMappingExceptionResolver
SpringMVC提供了自定义的异常处理器SimpleMappingExceptionResolver，使用方式
@Controller
public class TestController {
@RequestMapping("/test/hello")
public String testHello(){
System.out.println(1/0);
return "success";
}
}
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<!--key设置要处理的异常，value设置出现该异常时要跳转的页面对应的逻辑视图-->
<prop key="java.lang.ArithmeticException">error</prop>
</props>
</property>
<!--设置共享在请求域中的异常信息的属性名-->
<property name="exceptionAttribute" value="ex"></property>
</bean>
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>错误</title>
</head>
<body>
<h1>error.html</h1>
<p th:text="${ex}"></p>
</body>
</html>
二、基于注解的异常处理
1.ControllerAdvice 源码
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface ControllerAdvice {
@AliasFor("basePackages")
String[] value() default {};
@AliasFor("value")
String[] basePackages() default {};
Class<?>[] basePackageClasses() default {};
Class<?>[] assignableTypes() default {};
Class<? extends Annotation>[] annotations() default {};
}
2.ExceptionHandler 源码
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ExceptionHandler {
Class<? extends Throwable>[] value() default {};
}
3.控制层方法
package com.atguigu.controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
//将当前类标识为异常处理的组件
@ControllerAdvice
public class ExceptionController {
//设置要处理的异常信息
@ExceptionHandler(ArithmeticException.class)
public String handleException(Throwable ex,Model model){
//将异常信息共享到请求域，ex表示控制器方法出现的异常
model.addAttribute("ex",ex);
return "error";
}
}
运行效果：
提供CDN加速