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;
/**
 * 自定义的拦截器（放行登录操作和已经登录用户的操作）
 * @author archie2010
 *
 */
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：

<interceptors>
  <!-- login拦截器 -->
  <interceptor name="login" class="com.tq365.util.longinterceptor"/>
  <interceptor-stack name="myinterceptor">
 <interceptor-ref name="login"/>
 <interceptor-ref name="paramsprepareparamsstack"/>
  </interceptor-stack>
</interceptors>
<default-interceptor-ref name="myinterceptor"/>

希望本文所述对大家的java程序设计有所帮助。