Spring MVC处理异常有3种方式:
(1)使用Spring MVC提供的简单异常处理器SimpleMappingExceptionResolver;
(2)实现Spring的异常处理接口HandlerExceptionResolver 自定义自己的异常处理器;
(3)使用@ExceptionHandler注解实现异常处理;
1. 集成异常处理
使用SimpleMappingExceptionResolver实现异常处理
1、在Spring的配置文件springMVC.xml中增加以下内容:
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<!-- 定义默认的异常处理页面,当该异常类型的注册时使用 -->
<property name="defaultErrorView" value="error"></property>
<!-- 定义异常处理页面用来获取异常信息的变量名,默认名为exception -->
<property name="exceptionAttribute" value="ex"></property>
<!-- 定义需要特殊处理的异常,用类名或完全路径名作为key,异常也页名作为值 -->
<property name="exceptionMappings">
<props>
<prop key="cn.basttg.core.exception.BusinessException">error-business</prop>
<prop key="cn.basttg.core.exception.ParameterException">error-parameter</prop>
<!-- 这里还可以继续扩展对不同异常类型的处理 -->
</props>
</property>
</bean>
2.实现HandlerExceptionResolver 接口自定义异常处理器
增加HandlerExceptionResolver 接口的实现类MyExceptionHandler,代码如下:
public class MyExceptionHandler implements HandlerExceptionResolver {
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
Exception ex) {
Map<String, Object> model = new HashMap<String, Object>();
model.put("ex", ex);
// 根据不同错误转向不同页面
if(ex instanceof BusinessException) {
return new ModelAndView("error-business", model);
}else if(ex instanceof ParameterException) {
return new ModelAndView("error-parameter", model);
} else {
return new ModelAndView("error", model);
}
}
}
2、在Spring的配置文件springMVC.xml中增加以下内容:
<bean id="exceptionHandler" class="cn.basttg.core.exception.MyExceptionHandler"/>
3.使用@ExceptionHandler注解实现异常处理
增加CrowdExceptionResolver 类,并在类中使用@ExceptionHandler注解声明异常处理,代码如下:
public class CrowdExceptionResolver {
/**
* 空指针异常
*/
@ExceptionHandler(value = NullPointerException.class)
public ModelAndView resolverNullPointerException(NullPointerException exception, HttpServletRequest request, HttpServletResponse response) throws IOException {
return commonResolver("system-error", exception,request,response);
}
/**
* 数学异常
*/
@ExceptionHandler(value = ArithmeticException.class)
public ModelAndView resolverNullPointerException(ArithmeticException e, HttpServletRequest request, HttpServletResponse response) throws IOException {
System.out.println(e.getMessage());
return commonResolver("system-error", e,request,response);
}
/**
* 通用异常处理
* @param viewName 跳转视图名字
* @param e 异常类型
* @param request 请求
* @param response 响应
* @return
* @throws IOException
*/
protected ModelAndView commonResolver(String viewName ,Exception e, HttpServletRequest request, HttpServletResponse response) throws IOException {
boolean requestJson = CrowdUtil.isRequestAjax(request);
if (requestJson){//Ajax请求
ResultEntity<Object> resultEntity = ResultEntity.failed(e.getMessage());
String json = new Gson().toJson(resultEntity);
response.getWriter().write(json);
return null;
}
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("exception",e);
modelAndView.setViewName("system-error");
return modelAndView;
}
}
2、修改代码,使所有需要异常处理的Controller都继承该类,如下所示,修改后的TestController类继承于BaseController:
public class TestController extends CrowdExceptionResolver
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