loginaction.java

采用Struts框架做的网上啤酒买卖系统

package com.cavaness.beer4all.security;

import java.util.Locale;
import javax.servlet.http.*;
import javax.servlet.ServletContext;
import org.apache.struts.action.*;
import org.apache.struts.util.MessageResources;
import com.cavaness.beer4all.common.view.UserView;
import com.cavaness.beer4all.framework.UserContainer;
import com.cavaness.beer4all.framework.Beer4AllBaseAction;
import com.cavaness.beer4all.util.Constants;
import com.cavaness.beer4all.service.Beer4AllService;
import com.cavaness.beer4all.common.exceptions.InvalidLoginException;
import org.apache.commons.logging.*;

//这个类处理一个注册用户登录的功能
public class LoginAction extends Beer4AllBaseAction {
  //获取一个映射，在配置中是转发至index.jsp
  public ActionForward execute( ActionMapping mapping,
                                ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response )
  throws Exception{

    //从用户输入获得用户名
    String username = ((LoginForm)form).getUsername();
    //从用户输入获得用户密码
    String password = ((LoginForm)form).getPassword();

     //创建一个服务工厂
    Beer4AllService serviceImpl = this.getBeer4AllService();

    //从工厂获得一个注册用户登录的服务
    UserView  userView = serviceImpl.authenticate(username, password);
    //从请求对象获得用户信息库
    UserContainer existingContainer = getUserContainer(request);
    //将用户信息放到信息库中
    existingContainer.setUserView( userView );
    //返回一个成功状态的映射
    return mapping.findForward(Constants.SUCCESS_KEY);
  }
}