源码地址
十一、异常处理器 11.1）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
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，修改配置文件SpringMVC.xml，代码如下：
error
修改 TestController.java ，代码如下：
// 异常处理器
@RequestMapping("/testExceptionHandler")
public String testExceptionHandler() {
System.out.println(1 / 0);
return "success";
}
新建错误页面 error.html ，代码如下：
Title 出现错误
修改首页 index.html ，代码如下：
测试异常处理
测试：配置Tomacat后启动工程，浏览器访问：http://localhost:8080/SpringMvcDemo5/，点击“测试异常处理”超链接，页面跳转到成功页：http://localhost:8080/SpringMvcDemo5/testExceptionHandler，页面如下：
控制台输出：
17:11:47.708 [http-nio-8080-exec-6] DEBUG org.springframework.web.servlet.DispatcherServlet - GET "/SpringMvcDemo5/testExceptionHandler", parameters={}
17:11:47.721 [http-nio-8080-exec-6] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped to com.study.mvc.controller.TestController#testExceptionHandler()
FirstInterceptor-->preHandle
SecondInterceptor-->preHandle
17:11:47.759 [http-nio-8080-exec-6] DEBUG org.springframework.web.servlet.handler.SimpleMappingExceptionResolver - Resolving to view 'error' based on mapping [java.lang.ArithmeticException]
17:11:47.759 [http-nio-8080-exec-6] DEBUG org.springframework.web.servlet.handler.SimpleMappingExceptionResolver - Resolved [java.lang.ArithmeticException: / by zero] to ModelAndView [view="error"; model={ex=java.lang.ArithmeticException: / by zero}]
17:11:47.759 [http-nio-8080-exec-6] DEBUG org.springframework.web.servlet.DispatcherServlet - Using resolved error view: ModelAndView [view="error"; model={ex=java.lang.ArithmeticException: / by zero}]
SecondInterceptor-->afterCompletion
FirstInterceptor-->afterCompletion
17:11:47.852 [http-nio-8080-exec-6] DEBUG org.springframework.web.servlet.DispatcherServlet - Completed 200 OK
11.2）基于注解的异常处理
删除上述配置，使用注解进行异常处理，新建 ExceptionController.java，代码如下：
//@ControllerAdvice：将当前类标识为异常处理的组件
@ControllerAdvice
public class ExceptionController {
@ExceptionHandler(value = {ArithmeticException.class, NullPointerException.class})
public String testException(Exception ex, Model model) {
model.addAttribute("ex", ex);
return "error";
}
}
测试：配置Tomacat后启动工程，浏览器访问：http://localhost:8080/SpringMvcDemo5/，点击“测试异常处理”超链接，页面跳转到成功页：http://localhost:8080/SpringMvcDemo5/testExceptionHandler，页面如下：
控制台输出：
17:15:33.560 [http-nio-8080-exec-7] DEBUG org.springframework.web.servlet.DispatcherServlet - GET "/SpringMvcDemo5/testExceptionHandler", parameters={}
17:15:33.566 [http-nio-8080-exec-7] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped to com.study.mvc.controller.TestController#testExceptionHandler()
FirstInterceptor-->preHandle
SecondInterceptor-->preHandle
17:15:33.592 [http-nio-8080-exec-7] DEBUG org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Using @ExceptionHandler com.study.mvc.controller.ExceptionController#testException(Exception, Model)
17:15:33.600 [http-nio-8080-exec-7] DEBUG org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Resolved [java.lang.ArithmeticException: / by zero] to ModelAndView [view="error"; model={ex=java.lang.ArithmeticException: / by zero}]
17:15:33.600 [http-nio-8080-exec-7] DEBUG org.springframework.web.servlet.DispatcherServlet - Using resolved error view: ModelAndView [view="error"; model={ex=java.lang.ArithmeticException: / by zero}]
SecondInterceptor-->afterCompletion
FirstInterceptor-->afterCompletion
17:15:33.669 [http-nio-8080-exec-7] DEBUG org.springframework.web.servlet.DispatcherServlet - Completed 200 OK
