Struts1拦截器插件使用

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struts

Struts Spring Apache Servlet .net

最近处理以前项目的一些漏洞需要对from中的String字段做一下过滤再显示到页面，每一个action都做修改是不现实的，原本想写个servlet来处理但是考虑有些麻烦，因此搜了一下拦截器发现有人实现了struts1的拦截器，用这个比较方便，感谢这些奉献的人！

关于struts1的拦截器，一般是通过struts插件进行注册，网络上有2个开源组件的实现。
saif-0[1].1.jar和saif-spring.jar（该包依赖spring-webmvc-struts.jar包），不知2者是什么关系，本人根据比较后使用的是前者。下面详细介绍这2个组件：

现实一个action
/**
*
*/
package com.test;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
* @author Administrator
*
*/
public class TestAction extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {

System.out.println("testt ......");
return mapping.findForward("index");
}

}

struts配置：
<action-mappings>
    <action path="/browser" type="com.test.TestAction">
<forward name="index" path="/index.jsp" />
<forward name="index0" path="/index0.jsp" />
</action>
</action-mappings>

1、saif
a.实现拦截器
package com.test;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
public class DisplayInterceptor implements net.sf.struts.saif.ActionInterceptor {
public void afterAction(Action arg0, ActionMapping arg1, ActionForm arg2,
HttpServletRequest arg3, HttpServletResponse arg4)
throws IOException, ServletException {
System.out.println("after interceptor......");
}
public void beforeAction(Action arg0, ActionMapping arg1, ActionForm arg2,
HttpServletRequest arg3, HttpServletResponse arg4)
throws IOException, ServletException {
System.out.println("before interceptor......");
}
}
这里也可以继承自ComponentInterceptor类。
b.拦截器配置文件interceptor-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<interceptor-config>
    <interceptor name="displayInterceptor" type="com.test.DisplayInterceptor"/>

<default-interceptors>
<interceptor name="displayInterceptor"/>
</default-interceptors>
</interceptor-config>

c.struts配置文件中配上该插件
   <plug-in className="net.sf.struts.saif.SAIFPlugin">
      <set-property property="interceptor-config" value="/WEB-INF/interceptor-config.xml"/>
    </plug-in>
d.部署完毕有即可测试。

2、saif-spring.jar+spring-webmvc-struts.jar

a.实现拦截器

package com.test;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class DisplaySpringInterceptor implements net.sf.struts.saif.ActionHaveForwardInterceptor {
public ActionForward afterAction(Action arg0, ActionMapping arg1,
ActionForm arg2, HttpServletRequest arg3, HttpServletResponse arg4)
throws IOException, ServletException {
System.out.println("after Spring interceptor......");
return arg1.findForward("index0");
}

public ActionForward beforeAction(Action arg0, ActionMapping arg1,
ActionForm arg2, HttpServletRequest arg3, HttpServletResponse arg4)
throws IOException, ServletException {
System.out.println("before Spring interceptor......");
return arg1.findForward("index0");
}
}

b.拦截器配置文件interceptor-config1.xml
<?xml version="1.0" encoding="UTF-8"?>
<interceptor-config>
    <interceptor name="displayInterceptor1" type="com.test.DisplaySpringInterceptor"/>

   <action type="/browser">
          <interceptor name="displayInterceptor1" />
    </action>

</interceptor-config>
c.struts配置文件中配上该插件
   <plug-in className="net.sf.struts.saif.SAIFSpringPlugin">
      <set-property property="interceptor-config" value="/WEB-INF/interceptor-config1.xml"/>
    </plug-in>
d.部署完毕有即可测试。

注意：测试时要屏蔽一个插件，不能同时使用。

区别：1)前者不能针对某个action进行拦截而后者可以，但不能拦截到具体的方法；因此前者配置为默认拦截，后者可以默认也可以指定action，<action type="/browser"> 这里是action的名称。
2)前者依次执行完 beforeAction 、action和afterAction后跳转到action的ActionForward路径。后者执行beforeAction后如果该方法返回的ActionForward不为null就会执行跳转因此action将不会执行，如果为null则继续执行action；同样action的ActionForward不为null也执行跳转，afterAction则不会执行；否则就执行并跳转到afterAction的ActionForward路径。

以上执行逻辑与反编译后的代码是一致的，代码如下：
saif.jar ->net.sf.struts.saif.SAIFRequestProcessor

/*    */   protected ActionForward processActionPerform(HttpServletRequest request, HttpServletResponse response, Action action, ActionForm form, ActionMapping mapping)
/*    */     throws IOException, ServletException
/*    */   {
/* 89 */     this.helper.beforeAction(request, response, action, form, mapping);
/*    */
/* 91 */     ActionForward forward = super.processActionPerform(request, response, action, form, mapping);
/*    */
/* 94 */     this.helper.afterAction(request, response, action, form, mapping);
/*    */
/* 96 */     return forward;
/*    */   }
/*    */ }

saif-spring.jar ->net.sf.struts.saif.SAIFSpringRequestProcessor

protected ActionForward processActionPerform(HttpServletRequest request, HttpServletResponse response, Action action, ActionForm form, ActionMapping mapping)
/*    */     throws IOException, ServletException
/*    */   {
/* 58 */     ActionForward forward = this.helper.beforeAction(request, response, action, form, mapping);
/* 59 */     if (forward != null) {
/* 60 */       return forward;
/*    */     }
/* 62 */     forward = super.processActionPerform(request, response, action, form, mapping);
/* 63 */     if (forward != null) {
/* 64 */       return forward;
/*    */     }
/* 66 */     forward = this.helper.afterAction(request, response, action, form, mapping);
/*    */
/* 68 */     return forward;
/*    */   }
/*    */ }

这2个实现都继承org.apache.struts.action.RequestProcessor。

完整的工程在附件中。