Struts 2 实现Action的几种方式

package com.qst.chapter03.action;public class LoginAction {    private String userName;    private String password;  public String getUserName() {    return userName;  }  public void setUserName(String userName) {    this.userName = userName;  }  public String getPassword() {    return password;  }  public void setPassword(String password) {    this.password = password;  }    public String execute() {    System.out.println("----登录的用户信息-----");    System.out.println("用户名：" + userName);    System.out.println("密码：" + password);    if (userName.startsWith("qst") && password.length() >= 6) {      // 返回成功页面      return "ok";    } else {      // 返回失败页面      return "error";    }  }}