struts2 的拦截器的应用

 

和webwork得差不多，首先写拦截器配置文件：xwork-losbgm-default.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork 1.1.1//EN"
    "http://www.opensymphony.com/xwork/xwork-1.1.1.dtd">
<xwork>
    <include file="struts-default.xml" />
    <package name="xwork-losbgm-default" extends="struts-default">
        <interceptors>
            <interceptor name="employeeAccessInterceptor"
                class="tool.UserAccessInterceptor">
            </interceptor>
            <interceptor-stack name="losbgmStack">
                <interceptor-ref name="employeeAccessInterceptor"></interceptor-ref>
                <interceptor-ref name="defaultStack" />
            </interceptor-stack>
        </interceptors>
        <default-interceptor-ref name="losbgmStack"></default-interceptor-ref>
        <global-results>
            <result name="error">/error.jsp</result>
            <result name="index">/index.jsp</result>
        </global-results>
    </package>
</xwork>

 在写一个拦截器类：UserAccessInterceptor.java

//Source file: F:/java/Oil/src/com/xj/tools/UserAccessInterceptor.java

package tool;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class UserAccessInterceptor extends AbstractInterceptor ...{

    @Override
    public void destroy() ...{
        // TODO Auto-generated method stub
        super.destroy();
    }

    @Override
    public void init() ...{
        // TODO Auto-generated method stub
        super.init();
    }

    @Override
    public String intercept(ActionInvocation arg0) throws Exception ...{
        // TODO Auto-generated method stub
        
        return "error";
    }


}

再要实现拦截器的配置文件中先倒入文件再继承包就可以了：

<?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>
    <include file="struts-default.xml"></include>
    <include file="xwork-losbgm-default.xml"></include>
    <package name="login" namespace="/" extends="xwork-losbgm-default">
        <action name="login" class="action.LoginAction">
            <result name="success">/index.jsp</result>
        </action>
        <action name="main">
            <result>/main.jsp</result>
        </action>
        <action name="Register">
            <result>/index.jsp</result>
        </action>
        <action name="*">
            <result>/{1}.jsp</result>
        </action>
    </package>
</struts>

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struts2中的拦截器如何配置在action前后都执行呢？

 

public String intercept(ActionInvocation invocation) ...{   
  //do some job before invocation   
  //...   
  String result = invocation.invoke();   
  //do some job after invocation   
  //...   
  return result;   
}   

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