首先自定义2个拦截器MyHandlerInterceptor1和MyHandlerInterceptor2
MyHandlerInterceptor1.java
//拦截器
public class MyHandlerInterceptor1 implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("MyHandlerInterceptor1 preHandle handler = "+handler);
return false;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("MyHandlerInterceptor1 postHandle handler = "+handler+ " modelAndView = "+ modelAndView);
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("MyHandlerInterceptor1 afterCompletion handler = "+handler+" ex = "+ex);
}
}
MyHandlerInterceptor2.java
//拦截器
public class MyHandlerInterceptor2 implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("MyHandlerInterceptor2 preHandle handler = "+handler);
return false;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("MyHandlerInterceptor2 postHandle handler = "+handler+ " modelAndView = "+ modelAndView);
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("MyHandlerInterceptor2 afterCompletion handler = "+handler+" ex = "+ex);
}
}
在dispatcher-servlet.xml配置文件中配置拦截器
两个自定义的拦截器的执行情况
关于拦截器放行的问题 第一种情况：MyHandlerInterceptor1 放行 MyHandlerInterceptor2 放行 MyHandlerInterceptor1 preHandle return true MyHandlerInterceptor2 preHandle return true MyHandlerInterceptor2 postHandle MyHandlerInterceptor1 postHandle MyHandlerInterceptor2 afterCompletion MyHandlerInterceptor1 afterCompletion 第二种情况：MyHandlerInterceptor1 放行 MyHandlerInterceptor2 不放行 MyHandlerInterceptor1 preHandle return true MyHandlerInterceptor2 preHandle return false MyHandlerInterceptor1 afterCompletion 第三种情况：MyHandlerInterceptor1 不放行 MyHandlerInterceptor2 不放行 MyHandlerInterceptor1 preHandle return false
对于第二种情况的底层代码解析
为什么会执行MyHandlerInterceptor1 afterCompletion
所以会出现情况二的情况
不足之处敬请谅解！！！
