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eson15eson15
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springmvc的异常处理
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7 files changed

+109
-5
lines changed

7 files changed

+109
-5
lines changed

‎WebRoot/WEB-INF/jsp/custom_error.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>错误页面</title>
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</head>
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<body>
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${ex}
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</body>
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</html>

‎WebRoot/WEB-INF/jsp/error.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>错误页面</title>
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</head>
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<body>
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出错啦~~
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${message }
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</body>
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</html>

‎config/spring/springmvc.xml

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@@ -110,4 +110,21 @@
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<!-- 对资源文件内容缓存时间，单位秒 -->
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<property name="cacheSeconds" value="120"/>
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</bean>
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<!-- springmvc提供的简单异常处理器 -->
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<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
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<property name="defaultErrorView" value="/WEB-INF/jsp/error.jsp"/>
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<property name="exceptionAttribute" value="ex"/>
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<property name="exceptionMappings">
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<props>
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<prop key="ssm.exception.CustomException">/WEB-INF/jsp/custom_error.jsp</prop>
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</props>
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</property>
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</bean>
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<!-- 自定义的全局异常处理器
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只要实现HandlerExceptionResolver接口就是全局异常处理器
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<bean class="ssm.exception.CustomExceptionResolver"></bean>
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-->
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</beans>

‎src/ssm/controller/ItemsController.java

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import org.springframework.web.servlet.ModelAndView;
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import ssm.controller.validation.ValidGroup1;
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import ssm.exception.CustomException;
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import ssm.po.ItemsCustom;
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import ssm.po.ItemsQueryVo;
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import ssm.service.ItemsService;
@@ -46,10 +47,12 @@ public String editItems(Model model,
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// 根据id查询对应的Items
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ItemsCustom itemsCustom = itemsService.findItemsById(items_id);
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if(itemsCustom == null) {
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throw new CustomException("修改的商品信息不存在！");
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}
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model.addAttribute("itemsCustom", itemsCustom);
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// 通过形参中的model将model数据传到页面
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// 相当于modelAndView.addObject方法
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return "/WEB-INF/jsp/items/editItems.jsp";
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}
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‎src/ssm/exception/CustomException.java

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package ssm.exception;
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//定义一个简单的异常类
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public class CustomException extends Exception {
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//异常信息
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public String message;
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public CustomException(String message) {
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super(message);
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this.message = message;
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}
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public String getMessage() {
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return message;
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}
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public void setMessage(String message) {
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this.message = message;
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}
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}

‎src/ssm/exception/CustomExceptionResolver.java

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package ssm.exception;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.springframework.web.servlet.HandlerExceptionResolver;
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import org.springframework.web.servlet.ModelAndView;
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public class CustomExceptionResolver implements HandlerExceptionResolver {
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@Override
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public ModelAndView resolveException(HttpServletRequest request,
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HttpServletResponse response, Object handler, Exception ex) {
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ex.printStackTrace();
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CustomException customException = null;
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//如果抛出的是系统自定义的异常则直接转换
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if(ex instanceof CustomException) {
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customException = (CustomException) ex;
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} else {
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//如果抛出的不是系统自定义的异常则重新构造一个未知错误异常
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customException = new CustomException("系统未知错误");
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}
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//向前台返回错误信息
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ModelAndView modelAndView = new ModelAndView();
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modelAndView.addObject("message", customException.getMessage());
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modelAndView.setViewName("/WEB-INF/jsp/error.jsp");
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return modelAndView;
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}
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}

‎src/ssm/service/impl/ItemsServiceImpl.java

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@@ -36,9 +36,12 @@ public ItemsCustom findItemsById(Integer id) throws Exception {
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// 这里根据实际情况，对商品信息进行业务处理
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// ....
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// 返回扩展类ItemsCustom
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ItemsCustom itemsCustom = new ItemsCustom();
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// 将items的属性拷贝到itemsCustom
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BeanUtils.copyProperties(items, itemsCustom);
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ItemsCustom itemsCustom = null;
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if(items != null) {
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itemsCustom = new ItemsCustom();
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// 将items的属性拷贝到itemsCustom
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BeanUtils.copyProperties(items, itemsCustom);
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}
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return itemsCustom;
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}

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