struts框架访问数据库

一 在MySQL数据库中增加一张用户表

 

二 创建domain对象

package  com.cakin.domain;

 

public  class  Users {

         private  int  user_id ;

         private  String  user_pwd ;

         private  String  user_name ;

         private  String  user_email ;

         public  int  getUser_id() {

                 return  user_id ;

        }

         public  void  setUser_id( int  user_id) {

                 this . user_id  = user_id;

        }

         public  String getUser_pwd() {

                 return  user_pwd ;

        }

         public  void  setUser_pwd(String user_pwd) {

                 this . user_pwd  = user_pwd;

        }

         public  String getUser_name() {

                 return  user_name ;

        }

         public  void  setUser_name(String user_name) {

                 this . user_name  = user_name;

        }

         public  String getUser_email() {

                 return  user_email ;

        }

         public  void  setUser_email(String user_email) {

                 this . user_email  = user_email;

        }

        

}

 

三 创建service对象

package  com.cakin.service;

 

import  java.util.ArrayList;

import  com.cakin.domain.Users;

 

public  class  UsersService {

         public  boolean  checkUser(Users user)

        {

                String sql =  "select * from users where user_name =? and user_pwd=? " ;

                 SqlHelper  sqlHelper=  new  SqlHelper ();

                String [] parameters={user.getUser_name(),user.getUser_pwd()};

                 ArrayList  al=sqlHelper.executeQuery(sql,parameters);

                 if (al.size()==1)

                {

                         return  true ;

                }

                 else

                {

                         return  false ;

                }       

        }

}

 

四 action验证用户

package com.cakin.actions;

//这是一个action（表示小队长，需要继承Action）

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import com.cakin.domain.Users;

import com.cakin.forms.UserForm;

import com.cakin.service.UsersService;

public class LoginAction extends Action {

    private int num=0;

    //我们需要重新编写一个方法：execute会被自动调用，有点类似servlet的service方法。

    @Override

    public ActionForward execute(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response)

            throws Exception {

            //把form转成对应的UserForm对象

        UserForm userForm=(UserForm)form;

        

        //使用service（士兵到数据库去验证）

        UsersService usersService =new UsersService();

        Users user = new Users();

        user.setUser_name(userForm.getUsername());

        user.setUser_pwd(userForm.getPassword());

        if(usersService.checkUser(user))

        {

            return mapping.findForward("ok");

        }

        else

        {

            return mapping.findForward("err");

        }

    }

}