spring mvc中如何处理异常

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spring mvc中的404：

1.mappedHandler找不到

response.sendError(HttpServletResponse.SC_NOT_FOUND);

spring mvc异常机制

1.mappedHandler找不到 并且throwExceptionIfNoHandlerFound设定为true

throwExceptionIfNoHandlerFound

source:

                             if (this.throwExceptionIfNoHandlerFound) {                                        throw new NoHandlerFoundException(request.getMethod(), getRequestUri(request),                                                        new ServletServerHttpRequest(request).getHeaders());                                }                                else {                                        response.sendError(HttpServletResponse.SC_NOT_FOUND);                                }

config:

web.xml的配置Dispatcher的此参数为true

                                                                                  throwExceptionIfNoHandlerFound                                                true                                        

2.判断返回视图层之前是否发生了异常，主要有两种HandlerExceptionResolver、ModelAndViewDefiningException

3.如没有异常，则进行视图渲染

通过viewResolver找出相应的view，进行具体的模板渲染

通过不同的View实现AbstractView的renderMergedOutputModel方法

Exception if there's a problem rendering the view

如果ViewResolver匹配不到对应的View，则抛出ServletException

ServletException：if view is missing or cannot be resolved

spring mvc 异常处理

1.HandlerExceptionResolver

只能处理请求过程中抛出的异常

不处理异常处理本身所抛出的异常和视图解析过程中抛出的异常

2.@ControllerAdvice的@ExceptionHandler注解

3.1和2只能处理view之前的异常，如果是视图层渲染异常，需要另行处理

一.利用filter，捕获除了1和2之外的异常

                        public class ErrorHandlerFilter implements Filter {                          ErrorHandler errorHandler;                          @Override                          public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {                                try {                                  filterChain.doFilter(request, response);                                } catch (Exception ex) {                                  // call ErrorHandler and dispatch to error jsp                                  String errorMessage = errorHandler.handle(request, response, ex);                                  request.setAttribute("errorMessage", errorMessage);                                  request.getRequestDispatcher("/WEB-INF/jsp/error/dispatch-error.jsp").forward(request, response);                                }                          @Override                          public void init(FilterConfig filterConfig) throws ServletException {                                errorHandler = (ErrorHandler) WebApplicationContextUtils                                  .getRequiredWebApplicationContext(filterConfig.getServletContext())                                  .getBean("defaultErrorHandler");                          }                          // ...                        }

二.从写dispatchServlet再doservice时候捕获异常

                 public class DispatcherServletHandler extends DispatcherServlet {                                private static final String ERROR = "error";                                private static final String VIEW_ERROR_PAGE = "/WEB-INF/views/error/view-error.jsp";                                @Override                                protected void doService(HttpServletRequest request, HttpServletResponse response) throws Exception {                                        try{                                                super.doService(request, response);                                        } catch(Exception ex) {                                                request.setAttribute(ERROR, ex);                                                request.getRequestDispatcher(VIEW_ERROR_PAGE).forward(request, response);                                        }                                 }                        }

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