SpringMVC 中的Interceptor 拦截器也是相当重要和相当有用的,它的主要作用是拦截用户的请求并进行相应的处理。比如通过它来进行权限验证, 登录验证, 数据签名验证,日志处理,异常处理, 性能监控等。如果后面有时间,我们可以一起分享下权限验证, 登录验证, 数据签名验证,日志处理,异常处理, 性能监控的实现源码。举例:我们在preHandle记录开始的时间,在afterCompletion记录结束的时间,就可或者整个页面生成的时间。Spring自带StopWatch工具类来实现时间跟踪,关键一点interceptor不是线程安全的。我们需要借助threadlocal来实现线程安全。
1、自定义拦截器
SpringMVC 中的Interceptor 拦截请求是通过HandlerInterceptor 来实现的。 自定义拦截器, 主要有两种方式, 一种是实现HandlerInterceptor接口,或者是继承HandlerInterceptor接口的实现类(比如继承HandlerInterceptorAdapter) ; 一种是实现WebRequestInterceptor接口,或者是继承WebRequestInterceptor的实现类。
以下是spring 3.2.x版本的结构图,可以继承和实现这些方法来自定义拦截器。
1.1 实现HandlerInterceptor接口
HandlerInterceptor 接口中定义了三个方法,我们就是通过这三个方法来对用户的请求进行拦截处理的。
(1)boolean preHandle(),在controller被调用之前调用。SpringMVC 中的Interceptor 是链式的调用的, 有多个Interceptor的时候, 每个Interceptor 的调用会依据它的声明顺序依次执行。该方法的返回值是Boolean 类型的,当它返回为false 时,表示请求结束,后续的Interceptor 和Controller 都不会再执行;当返回值为true 时就会继续调用下一个Interceptor 的preHandle 方法,如果已经是最后一个Interceptor 的时候就会是调用当前请求的Controller 方法。
(2)void postHandle (),在controller被调用之后,DispatcherServlet 进行视图返回渲染之前 调用,可在modelandview中加入数据,比如当前时间;而且只能是在当前所属的Interceptor 的preHandle 方法的返回值为true 时才能被调用。 有多个Interceptor的时候,每个Interceptor 的postHandle ()调用会依据它的声明顺序的逆序依次执行。
(3)void afterCompletion(),在整个请求结束之后,也就是在DispatcherServlet 渲染了对应的视图之后执行,可用于清理资源等。而且只能是在当前所属的Interceptor 的preHandle 方法的返回值为true 时才能被调用。 有多个Interceptor的时候,每个Interceptor 的afterCompletion()调用会依据它的声明顺序的逆序依次执行。
从下图中, 我们可以看出这三个方法在设置多个拦截器是的执行顺序。
public class TestInterceptor implements HandlerInterceptor{ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("=========preHandle()方法,开始========================================================="); StringBuffer url = request.getRequestURL(); String uri = request.getRequestURI(); if(handler instanceof BillPurchase) { } System.out.println(url); System.out.println(handler); System.out.println("======preHandle()方法,结束============================================================"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { // TODO Auto-generated method stub System.out.println("============postHandle()方法, 开始======================================================"); StringBuffer url = request.getRequestURL(); String uri = request.getRequestURI();// System.out.println(modelAndView.getModelMap().toString()); System.out.println(uri); System.out.println(handler); System.out.println("==============postHandle()方法, 结束===================================================="); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { // TODO Auto-generated method stub System.out.println("==============afterCompletion()方法, 开始===================================================="); System.out.println("==============afterCompletion()方法, 结束===================================================="); }}
1.2 继承HandlerInterceptorAdapter实现类
HandlerInterceptorAdapter实现类实现了AsyncHandlerInterceptor接口, 而AsyncHandlerInterceptor接口继承自HandlerInterceptor接口, 它增加了一个方法:afterConcurrentHandlingStarted().
void afterConcurrentHandlingStarted(), 这个方法会在Controller方法异步执行时开始执行, 而Interceptor的postHandle方法则是需要等到Controller的异步执行完才能执行。
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MyInterceptor2</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">HandlerInterceptorAdapter</span>{</span> <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">boolean</span> <span class="hljs-title" style="box-sizing: border-box;">preHandle</span>(HttpServletRequest request, HttpServletResponse response, Object handler) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------preHandle2-------"</span>); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//如果返回false,则不再调用之后的方法 </span> } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">postHandle</span>(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------postHandle2-------"</span>); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(modelAndView != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>){ <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//加入当前时间 </span> modelAndView.addObject(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"now"</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Date()); } } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">afterCompletion</span>(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------afterCompletion2-------"</span>); } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">afterConcurrentHandlingStarted</span>(HttpServletRequest request, HttpServletResponse response, Object handler) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------afterConcurrentHandlingStarted2-------"</span>); } } </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li></ul>
1.3 实现WebRequestInterceptor接口
WebRequestInterceptor 中也定义了三个方法,我们也是通过这三个方法来实现拦截的。这三个方法都传递了同一个参数WebRequest ,这个WebRequest 是Spring 定义的一个接口,它里面的方法定义都基本跟HttpServletRequest 一样,在WebRequestInterceptor 中对WebRequest 进行的所有操作都将同步到HttpServletRequest 中,然后在当前请求中一直传递。
(1 )void preHandle(WebRequest request) 方法。这个方法跟HandlerInterceptor 中的preHandle的区别在于该方法的返回值是void,一般主要用它来进行资源的准备工作,比如我们在使用Hibernate 的时候可以在这个方法中准备一个Hibernate 的Session 对象,然后利用WebRequest 的setAttribute(name, value, scope) 把它放到WebRequest 的属性中。这里可以说说这个setAttribute 方法的第三个参数scope ,该参数是一个Integer 类型的。在WebRequest 的父层接口RequestAttributes 中对它定义了三个常量:
SCOPE_REQUEST :它的值是0 ,代表只有在request 中可以访问。
SCOPE_SESSION :它的值是1 ,如果环境允许的话它代表的是一个局部的隔离的session,否则就代表普通的session,并且在该session范围内可以访问。
SCOPE_GLOBAL_SESSION :它的值是2 ,如果环境允许的话,它代表的是一个全局共享的session,否则就代表普通的session,并且在该session 范围内可以访问。
(2 )void postHandle(WebRequest request, ModelMap model) 方法。该方法将在请求处理之后,也就是在Controller 方法调用之后被调用,但是会在视图返回被渲染之前被调用,所以可以在这个方法里面通过改变数据模型ModelMap 来改变数据的展示。该方法有两个参数,WebRequest 对象是用于传递整个请求数据的,比如在preHandle 中准备的数据都可以通过WebRequest 来传递和访问;ModelMap 就是Controller 处理之后返回的Model 对象,我们可以通过改变它的属性来改变返回的Model 模型。
(3 )void afterCompletion(WebRequest request, Exception ex) 方法。该方法会在整个请求处理完成,也就是在视图返回并被渲染之后执行。所以在该方法中可以进行资源的释放操作。而WebRequest 参数就可以把我们在preHandle 中准备的资源传递到这里进行释放。Exception 参数表示的是当前请求的异常对象,如果在Controller 中抛出的异常已经被Spring 的异常处理器给处理了的话,那么这个异常对象就是是null 。
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MyInterceptor3</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">implements</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">WebRequestInterceptor</span> {</span> <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">preHandle</span>(WebRequest request) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"MyInterceptor3 ........................"</span>); request.setAttribute(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"request"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"request"</span>, WebRequest.SCOPE_REQUEST); request.setAttribute(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"session"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"session"</span>, WebRequest.SCOPE_SESSION); request.setAttribute(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"globalSession"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"globalSession"</span>, WebRequest.SCOPE_GLOBAL_SESSION); } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">postHandle</span>(WebRequest request, ModelMap map) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (String key:map.keySet()) System.out.println(key + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------------------------"</span>);; map.put(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name3"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"value3"</span>); map.put(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name1"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name1"</span>); } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">afterCompletion</span>(WebRequest request, Exception exception) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// TODO Auto-generated method stub </span> System.out.println(exception + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-=-=--=--=-=-=-=-=-=-=-=-==-=--=-=-=-="</span>); } } </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul>
2、配置自定义拦截器
<code class="hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">beans</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://www.springframework.org/schema/beans"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns:xsi</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns:context</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://www.springframework.org/schema/context"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns:mvc</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://www.springframework.org/schema/mvc"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xsi:schemaLocation</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"</span>></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">mvc:interceptors</span>></span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 使用bean定义一个Interceptor,直接定义在mvc:interceptors根下面的Interceptor将拦截所有的请求 --></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">bean</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">class</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"com.interceptor.MyInterceptor3 "</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">mvc:interceptor</span>></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">mvc:mapping</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">path</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"/test/hahah.do"</span>/></span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 定义在mvc:interceptor下面的表示是对特定的请求才进行拦截的 --></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">bean</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">class</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"com.interceptor.<span style="line-height: 26px; background-color: rgb(240, 240, 240);">TestInterceptor </span>"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">mvc:interceptor</span>></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">beans</span>></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul>
注意:
<code class="hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">mvc:mapping</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">path</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"/*"</span>/></span> </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>
这个不是说拦截所有的请求,它代表了根目录下的第一级请求。如请求路径为
http://localhost:8080/Projectnmae/path1,如上配置可以被拦截,
如果请求路径为:http://localhost:8080/Projectnmae/path1/path2呢,如上配置则不能被拦截,需要修改配置为:
<span style="background-color: rgb(255, 255, 255);"><mvc:mapping path="/*/*"/> </span>
<span style="background-color: rgb(255, 255, 255);"></span><pre name="code" class="html"><span style="white-space:pre"></span><!-- 所有流程的表单名称以do结束 如:http://localhost:8080/MyProject/interceptor/index.do-> <mvc:mapping path="/{项目名}/**/*.do"/>
本文转载于:http://blog.csdn.net/xlxxcc/article/details/51878196 0 0