HandlerInterceptor的使用

69 阅读 0 评论 46 点赞

我是靠谱客的博主痴情夏天，这篇文章主要介绍HandlerInterceptor的使用，现在分享给大家，希望可以做个参考。

HandlerInterceptor顾名思义：handler拦截器。
在Controller被调用前使用
案例：

复制代码

1
2
3
4
5
6
7
8
9
<bean id="handleMappingInterceptor" class="com.ainoties.core.mvc.interceptor.HandleMappingInterceptor"></bean>
<!-- HandlerMapping -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping ">
<property name="interceptors">
<list>
<ref bean="handleMappingInterceptor"/>
</list>
</property>
</bean>

BeanNameUrlHandleMapping同样支持，似乎与BeanNameUrlHandlerMapping共同使用，更有味道。
HandlerInterceptor应该实现接口：HandlerInterceptor
org.springframework.web.servlet.HandlerInterceptor

实现类

复制代码

public class HandleMappingInterceptor extends HandlerInterceptorAdapter{
/**
* This implementation always returns {@code true}.
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("preHandle---->execute");
return super.preHandle(request, response, handler);
}
/**
* This implementation is empty.
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)throws Exception {
System.out.println("postHandle--->execute");
}
/**
* This implementation is empty.
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {
System.out.println("afterCompletion--->");
}
/**
* This implementation is empty.
*/
@Override
public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {
System.out.println("afterConcurrentHandlingStarted--->");
}
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
public class HandleMappingInterceptor extends HandlerInterceptorAdapter{
/**
* This implementation always returns {@code true}.
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("preHandle---->execute");
return super.preHandle(request, response, handler);
}
/**
* This implementation is empty.
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)throws Exception {
System.out.println("postHandle--->execute");
}
/**
* This implementation is empty.
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {
System.out.println("afterCompletion--->");
}
/**
* This implementation is empty.
*/
@Override
public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {
System.out.println("afterConcurrentHandlingStarted--->");
}
}

执行顺序：

复制代码

1
2
3
4
preHandle---->execute
HomeHandler.home-->execute!//Controller中的方法，也就是我们的控制层
postHandle--->execute
afterCompletion--->

复制代码

1
2
3
HandlerInterceptor接口方法
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler);
方法说明：返回true,执行链继续执行，返回false，则不再执行。则后续的Interceptor、Controller等不再执行。