标签:erro 统一 逻辑 mamicode web rip cat servlet lse
统一管理项目中的异常
抛出异常
显示异常
普通请求:在页面上显示异常信息
Ajax请求:返回json数据
服务器接收到用户请求过程中,如果有异常则抛出异常,SpringMVC的异常映射机制则会判断请求的类型从而响应不同的异常映射请求.
/** * @Description 判断请求是ajax还是普通请求 */ public class CrowdUtil { /** * 判断请求是否是ajax请求 * @param request * @return */ public static boolean isAjaxRequest(HttpServletRequest request) { String accept = request.getHeader("Accept"); String xRequestHeader = request.getHeader("X-Requested-With"); return ((accept!=null && accept.contains("application/json")) || (xRequestHeader != null && xRequestHeader.equals("XMLHttpRequest"))); } }
基于xml
步骤:
<!--异常映射--> <bean id="simpleMappingExceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <!--指定异常类型和逻辑视图名称的对应关系--> <property name="exceptionMappings"> <props> <!-- key表示异常类型 value表示映射的视图界面 --> <prop key="java.lang.Exception">system-error</prop> </props> </property> <!--使用exceptionAttribute可以修改异常对象存入请求域时使用的属性名--> <!--<property name="exceptionAttribute"></property>--> </bean>
然后指定映射的jsp页面即可.
基于注解
// @ControllerAdvice,表示这是一个基于注解的 异常处理类 @ControllerAdvice public class ExceptionResolver { // @ExceptionHandler 建立异常和类的映射关系 @ExceptionHandler(value = ArithmeticException.class) public ModelAndView resolverException(ArithmeticException e, HttpServletRequest request, HttpServletResponse response) throws IOException { // 判断请求的类型 boolean requestType = CrowdUtil.isAjaxRequest(request); // 如果是ajax请求 if (requestType) { // 创建ResultEntity ResultEntity<Object> failed = ResultEntity.failed(e.getMessage()); // 创建Gson Gson gson = new Gson(); // 将ResultEntity转为json String json = gson.toJson(failed); // 将json数据返还给浏览器 response.getWriter().write(json); // 因为使用了原生respones对象返回了响应,不提供ModelAndView对象 return null; } else { ModelAndView modelAndView = new ModelAndView(); modelAndView.addObject("exception", e); modelAndView.setViewName("system-error"); return modelAndView; } } /** * 提取可复用部分 * * @return */ public ModelAndView common(String viewName, Exception e, HttpServletRequest request, HttpServletResponse response) throws IOException { boolean requestType = CrowdUtil.isAjaxRequest(request); if (requestType) { ResultEntity<Object> failed = ResultEntity.failed(e.getMessage()); String json = new Gson().toJson(failed); response.getWriter().write(json); return null; } else { ModelAndView modelAndView = new ModelAndView(); modelAndView.addObject("exception", e); modelAndView.setViewName(viewName); return modelAndView; } } @ExceptionHandler(LoginFailedException.class) public ModelAndView resolverLoginFailedException(LoginFailedException e, HttpServletRequest request, HttpServletResponse response) throws IOException { String viewName = "/ad-login"; ModelAndView modelAndView = common(viewName, e, request, response); return modelAndView; } @ExceptionHandler(AccessForbidenException.class) public ModelAndView resolverAccessForbiddenException(AccessForbidenException e, HttpServletRequest request, HttpServletResponse response) throws IOException { String viewName = "/ad-login"; ModelAndView modelAndView = common(viewName, e, request, response); return modelAndView; } @ExceptionHandler(LoginAccountAlreadlyInUse.class) public ModelAndView resolverLoginAccountAlreadlyInUseException(LoginAccountAlreadlyInUse e, HttpServletRequest request, HttpServletResponse response) throws IOException { String viewName = "/add"; ModelAndView modelAndView = common(viewName, e, request, response); return modelAndView; } @ExceptionHandler(LoginAccountAlreadlyInUseForUpdate.class) public ModelAndView resolverLoginAccountAlreadlyInUseForUpdateException(LoginAccountAlreadlyInUseForUpdate e, HttpServletRequest request, HttpServletResponse response) throws IOException { String viewName = "system-error"; ModelAndView modelAndView = common(viewName, e, request, response); return modelAndView; } }
标签:erro 统一 逻辑 mamicode web rip cat servlet lse
原文地址:https://www.cnblogs.com/Adam-Ye/p/13339263.html