struts2自定义拦截器的示例代码

public class Intercaptor implements Interceptor{

  public void destroy() {
  }

  public void init() {

  }

  public String intercept(ActionInvocation invocation) throws Exception {
    Object user=ActionContext.getContext().getSession().get("user");
    if(user!=null){
      return invocation.invoke();
    }
    ActionContext.getContext().put("message", "请先登陆");
    return "success";
  }
}

  
      
      Message.jsp
  

public class Action extends ActionSupport{
  private String message;
  
  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }

  public String execute() throws Exception {
    return "success";
  }
}

 
  用户状态：${user!=null&＃63;"已登陆":"未登陆"}

  用户登陆
  用户退出
  /testIntercaptor/Action">
    
  
 

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 登陆成功
  <%
  request.getSession().setAttribute("user", "user");
  response.setHeader("refresh", "1;url=index.jsp");
  %>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 退出成功
  <%
  request.getSession().removeAttribute("user");
    response.setHeader("refresh", "1;url=index.jsp");
  %>

 
  ${message }