loginform.java

采用Struts框架做的网上啤酒买卖系统

package com.cavaness.beer4all.security;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.util.MessageResources;

public class LoginForm extends ActionForm {

  private String password = null;   //用户密码
  private String username = null;   //用户名
  //设置用户名
  public void setUsername(String username) {
    this.username = username;
  }
  //获得用户名
  public String getUsername() {
    return (this.username);
  }
  //获得用户密码
  public String getPassword() {
    return (this.password);
  }
  //设置用户密码
  public void setPassword(String password) {
    this.password = password;
  }

  //验证用户是否输入用户信息，返回错误信息，如果没有错误，返回NULL值
  public ActionErrors validate(ActionMapping mapping,
                               HttpServletRequest request) {
    //创建一个空错误列表对象
    ActionErrors errors = new ActionErrors();

    //获得系统资源信息对象(foo.out文件)
    MessageResources resources =
      (MessageResources)request.getAttribute( Action.MESSAGES_KEY );
    //当用户名为空时
    if(getUsername() == null || getUsername().length() < 1) {
    //获取资源信息中错误源的名称
    String usernameLabel = resources.getMessage( "label.username" );
      //将错误信息添加到错误列表中
      errors.add( ActionErrors.GLOBAL_ERROR,
                  new ActionError("errors.required", usernameLabel ));
    }
    //当用户密码为空时
    if(getPassword() == null || getPassword().length() < 1) {
    //获取资源信息中错误源的名称
    String passwordLabel = resources.getMessage( "label.password" );
      //将错误信息添加到错误列表中
      errors.add( ActionErrors.GLOBAL_ERROR,
                  new ActionError("errors.required", passwordLabel ));
    }
    //返回错误列表
    return errors;
  }

  //重置LoginForm
  public void reset(ActionMapping mapping,
                    HttpServletRequest request) {
    this.password = null;
    this.username = null;
  }
}