SpringMVC异常处理
基于配置的异常处理
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。
public interface HandlerExceptionResolver {
@Nullable
ModelAndView resolveException(
HttpServletRequest request, HttpServletResponse response, @Nullable Object handler, Exception ex);
}
HandlerExceptionResolver接口的实现类有:DefaultHandlerExceptionResolver和SimpleMappingExceptionResolver。
SpringMVC提供了自定义的异常处理器SimpleMappingExceptionResolver,springmvc.xml中配置异常处理:
<!--配置异常处理-->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<!--
properties的键表示处理器方法执行过程中出现的异常
properties的值表示若出现指定异常时,设置一个新的视图名称,跳转到指定页面
-->
<prop key="java.lang.ArithmeticException">error</prop>
</props>
</property>
<!--
exceptionAttribute属性设置一个属性名,将出现的异常信息在请求域中进行共享
-->
<property name="exceptionAttribute" value="ex"></property>
</bean>
controller中制造异常:
package com.lalala.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloController {
@RequestMapping("/")
public String index() {
return "index";
}
@RequestMapping("/testExceptionHandler")
public String testExceptionHandler() {
System.out.println(1/0);
return "success";
}
}
基于注解的异常处理
package com.lalala.controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
@ControllerAdvice
public class ExceptionController {
@ExceptionHandler(value = {ArithmeticException.class, NullPointerException.class})
public String testException(Exception ex, Model model){
model.addAttribute("ex", ex);
return "error";
}
}