Exception Handler

1
2
3
4
5
6
7
8
9

package org.springframeowork.web.servlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public interface HandlerExceptionResolver {
  ModelAndView resolveException(HttpServletRequest request,
                                HttpServletResponse response,
                                Object handler,
                                Exception ex);
}

• Dispatcher servlet会查找application context里的所有实现了HandlerExceptionResolver接口的Bean。
• 如果有多个ExceptionResolver实现，在有异常出现时，Dispatcher Servlet会一次调用，直到viewname被返回或者response被写入。
• 如果异常没有被处理，那么异常会重新抛出。

Spring提供的HandlerExceptionResolver实现

• AnnotationMethodHandlerExceptionResolver
• ExceptionHandlerExceptionResolver
• DefaultHandlerExceptionResolver
• ResponseStatusExceptionResolver
• SimpleMappingExceptionResolver
• HandlerExceptionResolverComposite