我的第一个struct数据库程序!(三)

=============LoginAction.java===================
package com.eShop.login;

import org.apache.struts.action.Action;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForward;
import javax.servlet.ServletException;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import javax.sql.DataSource;
import java.sql.Connection;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
import javax.servlet.http.HttpSession;

public final class LoginAction extends Action {
    public ActionForward execute(ActionMapping mapping,
      ActionForm form,
      HttpServletRequest request,
      HttpServletResponse response)
      throws IOException, ServletException {
      //get userinfo
      UserForm userForm = (UserForm) form;
       //从web层获得用户名和口令
      String username = userForm.getUsername();
      String password = userForm.getPassword();
      //声明错误集对象
ActionErrors errors = new ActionErrors();
//声明数据源和连接对象
DataSource dataSource;
Connection conn=null;
//校验输入

//调用业务逻辑
      //调用业务逻辑
 if(errors.size()==0){
     String validated = "";
     try{
        //取得数据库连接
         dataSource = getDataSource(request,"dbsource");
         conn = dataSource.getConnection();

         LoginBean lb = new LoginBean(conn);
         validated = lb.validatePwd(username,password);

        if(validated.equals("match")){
         //一切正常就保存用户信息并转向成功的页面
         HttpSession session = request.getSession();
         session.setAttribute("uf", form);
       //return null;
         return mapping.findForward("success");
        }

     }
    catch(Throwable e){
    //处理可能出现的错误
    e.printStackTrace();
    ActionError error=new ActionError(e.getMessage());
    errors.add(ActionErrors.GLOBAL_ERROR,error);
    }

  }

  //如出错就转向输入页面，并显示相应的错误信息
  saveErrors(request, errors);
        return new ActionForward(mapping.getInput());

      }

}