用spring的接口HandlerExceptionResolver,可以处理一些自定义个化的异常;实现步骤也比较简单:
(1)实现HandlerExceptionResolver接口,如:
public class BBS7ExceptionHandler implements HandlerExceptionResolver { private static final Logger logger = LoggerFactory.getLogger(BBS7ExceptionHandler.class); @Override public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { //做一些自定义方法,比如记log等 if (ex instanceof BBS7Exception) { // do something.. } Map<String, Object> model = new HashMap<String, Object>(); model.put("appName", appName); return new ModelAndView("/error/jsonError", model); } } }
(2)在spirng中,注入异常处理的bean,如:
<bean id="exceptionHandler" class="cn.pconline.bbs7.exceptions.BBS7ExceptionHandler" />
(3)使用的时候,在方法中抛出相应异常 :(主要是Controller层)
@RequestMapping(value = "/reply", params = {"action=reply", "tid"}) public String toPost(long tid, Model model, HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException { //判断是否登录、账号被锁、邮箱验证 JsonResult jsonResult = actionValidate.validate(request, response, new Action[]{Action.LOGIN, Action.LOCK_USER, Action.EXAM_EMAIL, Action.SECRET_FORUM}); if (!jsonResult.isSuccess()) { throw new BBS7Exception(jsonResult.getDesc()); } }
这样,在第3步抛出异常的时候,spring会自动检测到异常,就会用第1步resolveException方法处理,跳到相应的页面了。