java自定义拦截器用法实例

本文实例讲述了java自定义拦截器及其用法。分享给大家供大家参考。具体如下：

LoginInterceptor.java文件如下：

package com.tq365.util;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.tq365.vo.User;

public class LoginInterceptor extends AbstractInterceptor{
  private static final long serialVersionUID = 1406123004582563032L;
  @Override
  public String intercept(ActionInvocation invocation) throws Exception {
    HttpServletRequest request = ServletActionContext.getRequest();
    HttpSession session = ServletActionContext.getRequest().getSession();
    User user = (User)session.getAttribute("USER");
    // 请求的url
    String path = request.getServletPath();
    boolean flag = false;
    if("/loginuser.jspx".equals(path)){
      flag = true;
    }else{
      if(user!=null){
 flag = true;
      }
    }
    System.out.println(path);
    return flag ? invocation.invoke() : "error";
  }
}

struts.xml文件如下：

希望本文所述对大家的java程序设计有所帮助。