struts2自定义拦截器
用于拦截用户是否已登录的拦截器,若用户已登录则允许进行文件上传,否则提示“你无权进行此操作”
PermissionInterceptor.java:
package blog.interceptor; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.Interceptor; public class PermissionInterceptor implements Interceptor { private static final long serialVersionUID = -1792781021079451671L; @Override public void destroy() { } @Override public void init() { } @Override public String intercept(ActionInvocation invocation) throws Exception { Object user = ActionContext.getContext().getSession().get("user"); if(user != null) return invocation.invoke();//如果已经登录了,返回的是视图的结果(action当中的result) ActionContext.getContext().getSession().put("message", "你没有权限进行此操作"); return "message"; } }
struts-fileUpload.xml:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="interceptor" extends="struts-default" namespace="/control/permission"> <interceptors> <interceptor name="permission" class="blog.interceptor.PermissionInterceptor"></interceptor> <interceptor-stack name="permissionStack"> <interceptor-ref name="defaultStack"/> <interceptor-ref name="permission"/> </interceptor-stack> </interceptors> <default-interceptor-ref name="permissionStack"></default-interceptor-ref> <action name="interceptor_*" class="blog.action.MultiFileUpload" method="{1}"> <result name="message">/WEB-INF/page/message.jsp</result> <result name="success">/WEB-INF/page/multiFileUpload.jsp</result> </action> </package> </struts>
如果既想使用默认拦截器又要在某个action当中显示的使用某一个拦截器,则需要同时在action中使用这两个拦截器:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="interceptor" extends="struts-default" namespace="/control/permission"> <interceptors> <interceptor name="permission" class="blog.interceptor.PermissionInterceptor"></interceptor> <interceptor-stack name="permissionStack"> <interceptor-ref name="defaultStack"/> <interceptor-ref name="permission"/> </interceptor-stack> </interceptors> <default-interceptor-ref name="permissionStack"></default-interceptor-ref> <action name="interceptor_*" class="blog.action.MultiFileUpload" method="{1}"> <interceptor-ref name="permissionStack"></interceptor-ref> <interceptor-ref name="otherIntercepter"></interceptor-ref> <result name="message">/WEB-INF/page/message.jsp</result> <result name="success">/WEB-INF/page/multiFileUpload.jsp</result> </action> </package> </struts>