问题遇到的现象和发生背景
实现HandlerInterceptor的类中的preHandle方法抛出一个异常,异常处理类中对应的处理方法没有执行
问题相关代码,请勿粘贴截图
@ControllerAdvice
public class CrowdExceptionResolver {
@ExceptionHandler(value = LoginFailedException.class)
public ModelAndView resolveLoginFailedException(
LoginFailedException exception,
HttpServletRequest request,
HttpServletResponse response
) throws IOException {
String viewName = "login";
return commonResolve(viewName, exception, request, response);
}
@ExceptionHandler(value = AccessForbiddenException.class)
public ModelAndView resolveAccessForbiddenException(
AccessForbiddenException exception,
HttpServletRequest request,
HttpServletResponse response) throws IOException {
String viewName = "login";
return commonResolve(viewName, exception, request, response);
}
@ExceptionHandler(value = LoginAcctAlreadyInUseForUpdateException.class)
public ModelAndView resolveLoginAcctAlreadyInUseForUpdateException(
LoginAcctAlreadyInUseForUpdateException exception,
HttpServletRequest request,
HttpServletResponse response) throws IOException {
String viewName = "edit";
return commonResolve(viewName, exception, request, response);
}
// @ExceptionHandler将一个具体的异常类型和一个方法关联起来
private ModelAndView commonResolve(
// 异常处理完成后要去的页面
String viewName,
// 实际捕获到的异常类型
Exception exception,
// 当前请求对象
HttpServletRequest request,
// 当前响应对象
HttpServletResponse response) throws IOException {
// 1.判断当前请求类型
boolean judgeResult = CrowdUtil.judgeRequestType(request);
// 2.如果是Ajax请求
if(judgeResult) {
// 3.创建ResultEntity对象
ResultEntity<Object> resultEntity = ResultEntity.failed(exception.getMessage());
// 4.创建Gson对象
Gson gson = new Gson();
// 5.将ResultEntity对象转换为JSON字符串
String json = gson.toJson(resultEntity);
// 6.将JSON字符串作为响应体返回给浏览器
response.getWriter().write(json);
// 7.由于上面已经通过原生的response对象返回了响应,所以不提供ModelAndView对象
return null;
}
// 8.如果不是Ajax请求则创建ModelAndView对象
ModelAndView modelAndView = new ModelAndView();
// 9.将Exception对象存入模型
modelAndView.addObject("exception", exception);
// 10.设置对应的视图名称
modelAndView.setViewName(viewName);
// 11.返回modelAndView对象
return modelAndView;
}
}
public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
HttpSession session = httpServletRequest.getSession();
Admin admin =(Admin) session.getAttribute("admin");
if(admin==null){
throw new AccessForbiddenException(CrowdConstant.MESSAGE_ACCESS_FORBIDEN);
}else{
return true;
}
}
@Override
public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle");
}
@Override
public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
System.out.println("afterCompletion");
}
}
运行结果及报错内容
后端报错:
24-Jul-2022 08:26:51.850 严重 [http-apr-8080-exec-6] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [springDispatcherServlet] in context with path [/webui] threw exception [Request processing failed; nested exception is com.huanghu.crowd.exception.AccessForbiddenException: 请登录以后再访问!] with root cause
com.huanghu.crowd.exception.AccessForbiddenException: 请登录以后再访问!
at com.huanghu.crowd.interceptor.LoginInterceptor.preHandle(LoginInterceptor.java:26)
at org.springframework.web.servlet.HandlerExecutionChain.applyPreHandle(HandlerExecutionChain.java:133)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:962)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2508)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2497)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
前端报错:
我的解答思路和尝试过的方法
service层抛出的异常可以处理
我想要达到的结果
发生异常后执行异常处理类中方法,跳到指定页面