Struts2拦截器

拦截器

对类的拦截：

package com.chinaosft.intercepor;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.chinasoft.entity.User;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class LoginIntercepor extendsAbstractInterceptor{

@Override

public String intercept(ActionInvocation arg0) throws Exception {

// TODO Auto-generated method stub

//对类的拦截

String result="login";

HttpSession session = ServletActionContext.getRequest().getSession();

User user= (User) session.getAttribute("user");

if(user!=null){

result=arg0.invoke();

}

return result;

}

}

对方法的拦截：

package com.chinaosft.intercepor;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.chinasoft.entity.User;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

public class SingerMIntercepor extendsMethodFilterInterceptor{

@Override

protected StringdoIntercept(ActionInvocation arg0) throwsException{

// TODO Auto-generated method stub

//对方法的拦截

String result="login";

HttpSession session = ServletActionContext.getRequest().getSession();

User user= (User) session.getAttribute("user");

if(user!=null){

result=arg0.invoke();

}

return result;

}

}

注意区分

<!--动态方法调用开启 -->

<constant name="struts.enable.DynamicMethodInvocation" value="true" />

<package name="musicpackage" namespace="/" extends="struts-default">

<!--定义拦截器 -->

<interceptors>

<!-- 对类的拦截 -->

<interceptor name="loginint" class="com.chinaosft.intercepor.LoginIntercepor"></interceptor>

<!-- 对方法的拦截 -->

<interceptor name="methodint" class="com.chinaosft.intercepor.SingerMIntercepor"></interceptor>

</interceptors>

<!-- 动态方法调用 -->

<action name="singer" class="com.chinaosft.action.SingerAction">

<!-- 绑定拦截器 对整个 ACTION 的拦截-->

<!-- <interceptor-ref name="loginint"></interceptor-ref>

<interceptor-ref name="defaultStack"></interceptor-ref>

<result name="login">/login.jsp</result> -->

<result name="select">/singer.jsp</result>

<result name="delete" type="redirectAction">

<param name="actionName">singer</param>

<param name="method">selectSinger</param>

</result>

<result name="selectOne">updateSinger.jsp</result>

<result name="update" type="redirectAction">

<param name="actionName">singer</param>

<param name="method">selectSinger</param>

</result>

<result name="add" type="redirectAction">

<param name="actionName">singer</param>

<param name="method">selectSinger</param>

</result>

<!-- 对指定方法的拦截 -->

<interceptor-ref name="methodint">

<param name="includeMethods">deleteSinger</param>

</interceptor-ref>

<interceptor-ref name="defaultStack"></interceptor-ref>

<result name="login">/login.jsp</result>

</action>

</package>

------------------------------------------------------------------

在一个页面点击登录，登录成功之后回到当前页面

核心代码 （Struts2_Test_3）

//保存访问的地址（获取上次访问的URL链接）

String url = ServletActionContext.getRequest().getHeader("Referer");

session.setAttribute("url", url);

public String login(){

//登录成功后保存登录信息

HttpSession session = ServletActionContext.getRequest().getSession();

session.setAttribute("user", user);

//判断是否有之前的页面

Object url = session.getAttribute("url");

if(url != null){

try {

ServletActionContext.getResponse().sendRedirect(url.toString());

return null;

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return "success";

}

点击一个操作之后需先登录，登陆后执行点击的操作，添加核心代码 （Struts2_Test_4）

package com.chinasoft.intercepor;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.chinasoft.entity.User;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

public class SingerMIntercepor extends MethodFilterInterceptor {

@Override

protected String doIntercept(ActionInvocation arg0) throws Exception {

// TODO Auto-generated method stub

// 对方法的拦截

String result = "login";

HttpSession session = ServletActionContext.getRequest().getSession();

User user = (User) session.getAttribute("user");

if (user != null) {

result = arg0.invoke();

}else{

//保存访问的地址

String url = ServletActionContext.getRequest().getRequestURL().toString();

//保存访问地址的参数

String queryString = ServletActionContext.getRequest().getQueryString();

System.out.println(url);

if(queryString!=null){

System.out.println(queryString);

url += "?"+queryString;

}

session.setAttribute("url", url);

}

return result;

}

}

与Struts2_Test配套使用