简易商品模块实现

了解了数据库，和java的简单操作，我们简单是实现一个商品窗口；

三次架构：　持久层:完成内存数据和磁盘数据的转换；

　　　　　　业务层：将表现层提供数据处理后，交由持久层完成数据保存

　　　　　　表现层：完成数据的提供和展示，并完成流程控制　　　　　　　　　　

以下为实现代码

建立商品类，属性对应数据库中商品表格的列

package com.project.bean;

import java.sql.Date;

public class ProductBean {
    /** 商品编号 */
    private int id;
    /** 商品名 */
    private String name;
    /** 商品单价 */
    private int price;
    /** 商品产地 */
    private String address;
    /** 商品日期 */
    private Date createDate;
    
    
    public ProductBean() {
        super();
        
    }
    public ProductBean(String name, int price, String address, Date createDate) {
        super();
        this.name = name;
        this.price = price;
        this.address = address;
        this.createDate = createDate;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public Date getCreateDate() {
        return createDate;
    }
    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }
    @Override
    public String toString() {
        return "ProductBean [id=" + id + ", name=" + name + ", price=" + price + ", address=" + address
                + ", createDate=" + createDate + "]
";
    }
    
}

package com.project.dao;

import java.sql.Date;
import java.util.List;

import com.project.bean.ProductBean;

/**
 * 商品持久接口
 * 
 * @author Administrator
 *
 */
public interface IProductDao {

    /**
     * 商品添加
     * 
     * @param bean
     *            商品对象
     */
    public void add(ProductBean bean);

    /**
     * 按id删除商品
     * 
     * @param id
     *            商品id
     */
    public void del(int id);

    /**
     * 按id号修改单价
     * 
     * @param id
     *            商品id
     * @param price
     *            商品单价
     */
    public void update(int id, int price);

    /**
     * 按id做查询
     * 
     * @param id
     *            商品id
     * @return 商品对象
     */
    public ProductBean findById(int id);

    /**
     * 动态查询
     * 
     * @param name
     *            商品名
     * @param startDate
     *            商品起始日期
     * @param endDate
     *            商品结束日期
     * @return 商品集合
     */
    public List<ProductBean> findByItem(String name, Date startDate, Date endDate);
}

package com.project.dao.impl;

import java.sql.Date;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.project.bean.ProductBean;
import com.project.dao.IProductDao;

package com.project.dao.impl;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**链接类，为父类，方便，商品接口实现类，完成数据库和Java的链接，和数据实现
public class BaseDao {
    /** 连接对象 */
    protected Connection con;
    /** 预编译SQL语句执行对象 */
    protected PreparedStatement ps;
    /** 结果集对象 */
    protected ResultSet rs;

    /**
     * 建立连接
     */
    public void setConnection() {
        try {
            Class.forName("org.gjt.mm.mysql.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/admin?characterEncoding=utf-8", "root",
                    "lovo");
        } catch (Exception e) {

            e.printStackTrace();
        }
    }

    /**
     * 关闭连接
     */
    public void closeConnection() {
        try {
            if (rs != null) {
                rs.close();
            }
            if (ps != null) {
                ps.close();
            }
            if (con != null) {
                con.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }

}

 

/**
 * 商品持久接口实现类
 * 
 * @author Administrator
 *
 */
public class ProductDaoImpl extends BaseDao implements IProductDao {

    public static void main(String[] args) {
        ProductDaoImpl dao = new ProductDaoImpl();
        dao.add(new ProductBean("皮皮虾", 20, "广东",
        Date.valueOf("2017-05-12")));
        // dao.del(7);
        // dao.update(5, 150);
        // ProductBean bean=dao.findById(1);
        // System.out.println(bean);
//        List<ProductBean> list = dao.findByItem("机", Date.valueOf("2016-01-01"), Date.valueOf("2016-12-31"));
//        System.out.println(list);
    }

    @Override
    public void add(ProductBean bean) {
        this.setConnection();

        try {
            ps = con.prepareStatement("INSERT INTO t_product(pname,price,createAddress,createDate)VALUES(?,?,?,?)");
            ps.setString(1, bean.getName());
            ps.setInt(2, bean.getPrice());
            ps.setString(3, bean.getAddress());
            ps.setDate(4, bean.getCreateDate());
            ps.executeUpdate();

        } catch (SQLException e) {

            e.printStackTrace();
        } finally {
            this.closeConnection();
        }

    }

    @Override
    public void del(int id) {
        this.setConnection();

        try {
            ps = con.prepareStatement("DELETE FROM t_product WHERE id=?");
            ps.setInt(1, id);
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            this.closeConnection();
        }

    }

    @Override
    public void update(int id, int price) {
        this.setConnection();

        try {
            ps = con.prepareStatement("UPDATE t_product SET price=? WHERE id=?");
            ps.setInt(1, price);
            ps.setInt(2, id);
            ps.executeUpdate();

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            this.closeConnection();
        }
    }

    @Override
    public ProductBean findById(int id) {
        ProductBean bean = null;
        this.setConnection();

        try {
            ps = con.prepareStatement("SELECT*FROM t_product WHERE id=?");
            ps.setInt(1, id);
            rs = ps.executeQuery();
            if (rs.next()) {
                bean = new ProductBean();
                bean.setId(rs.getInt("id"));
                bean.setName(rs.getString("pname"));
                bean.setPrice(rs.getInt("price"));
                bean.setAddress(rs.getString("createAddress"));
                bean.setCreateDate(rs.getDate("createDate"));

            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            this.closeConnection();
        }

        return bean;
    }

    @Override
    public List<ProductBean> findByItem(String name, Date startDate, Date endDate) {
        List<ProductBean> list = new ArrayList<ProductBean>();
        //拼接字符串，满足sql语句当有名字或者日期是输出相对应的查找语句
        String sql = "SELECT*FROM t_product WHERE 1=1 ";
        if (name != null && name.length() != 0) {
            sql += " and pname like '%" + name + "%' ";
        }
        if (startDate != null) {
            sql += " and createDate >='" + startDate + "' ";
        }
        if (endDate != null) {
            sql += " and createDate <='" + endDate + "' ";
        }
        this.setConnection();

        try {
            ps = con.prepareStatement(sql);
            rs = ps.executeQuery();
            while (rs.next()) {
                ProductBean bean = new ProductBean();
                bean.setId(rs.getInt("id"));
                bean.setName(rs.getString("pname"));
                bean.setPrice(rs.getInt("price"));
                bean.setAddress(rs.getString("createAddress"));
                bean.setCreateDate(rs.getDate("createDate"));
                list.add(bean);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            this.closeConnection();
        }

        return list;
    }

}

package com.project.service;

import java.sql.Date;
import java.util.List;

import com.project.bean.ProductBean;
/**
 * 业务持久接口
 * @author Administrator
 *
 */
public interface IProductService {
    /**
     * 添加商品
     * @param bean商品对象
     */
    public void add(ProductBean bean);
    
    /**
     *删除商品 
     * @param id商品id
     */
    public void del(int id);
    
    /**
     * 按id查询商品
     * @param id商品id
     * @return 商品对象
     */
    public ProductBean findById(int id);
    
    /**
     * 按id修改商品单价
     * @param id 商品id
     * @param price 商品新单价
     */
    public void update(int id,int price);
    /**
     * 动态条件查询商品
     * @param name 商品名
     * @param startDate 起始生产日期
     * @param endDate    结束生产日期
     * @return  商品集合
     */
    public List<ProductBean> findByItem(String name,Date startDate,Date endDate);
    
}
package com.project.service.Impl;

import java.sql.Date;
import java.util.List;

import com.project.bean.ProductBean;
import com.project.dao.IProductDao;
import com.project.dao.impl.ProductDaoImpl;
import com.project.service.IProductService;
/**
 * 业务持久接口实现类
 * @author Administrator
 *
 */
public class ProductSreviceImpl implements IProductService {
private  IProductDao dao=new ProductDaoImpl();

    @Override
    public void add(ProductBean bean) {
        dao.add(bean);
        
    }

    @Override
    public void del(int id) {
        dao.del(id);
        
    }

    @Override
    public ProductBean findById(int id) {
        
        return dao.findById(id);
    }

    @Override
    public void update(int id, int price) {
        dao.update(id, price);
        
    }

    @Override
    public List<ProductBean> findByItem(String name, Date startDate, Date endDate) {
        
        return dao.findByItem(name, startDate, endDate) ;
    }

}

package com.project.frame;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Date;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

import com.lovo.netCRM.component.LovoButton;
import com.lovo.netCRM.component.LovoTable;
import com.lovo.netCRM.component.LovoTxt;
import com.project.bean.ProductBean;
import com.project.service.IProductService;
import com.project.service.Impl.ProductSreviceImpl;
import com.project.util.ChangeDate;

public class MainFrame extends JFrame {
    //第一个参数表格加入的容器
    //第二个参数表头列表
    //第三个参数表头对应实体类的属性名
    //第四个参数实体类中主键属性名
    private LovoTable table=new LovoTable(this,new String []{"商品名","商品单价","商品产地","商品日期"}
            ,new String [] {"name","price","address","createDate"}, "id");
    /**商品名文本框*/
    private LovoTxt nameTxt=new LovoTxt("商品名", 400, 50, this);
    /**起始日期文本框*/
    private LovoTxt startTxt=new LovoTxt("起始日期", 400, 90, this);
    /**结束日期文本框*/
    private LovoTxt endTxt=new LovoTxt("结束日期", 400, 130, this);
    /**商品业务组件*/
    private IProductService service=new ProductSreviceImpl();
    public MainFrame() {
        this.setLayout(null);
        //调用业务方法得到全部商品
        List<ProductBean> list=service.findByItem("", null, null);
        
        table.setSizeAndLocation(50, 30, 300, 200);
        
        table.updateLovoTable(list);
        
        LovoButton findButton=new LovoButton("查找", 500, 160, this);
        findButton.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent arg0) {
                //得到文本框数据
                String name=nameTxt.getText();
                //在工具类写判断日期是否正确方法
                Date startDate=ChangeDate.getDate(startTxt.getText());
                Date endDate=ChangeDate.getDate(endTxt.getText());
                //调用业务方法得到查询结果
                List<ProductBean> list=service.findByItem(name, startDate, endDate);
                //更新表格数据
                table.updateLovoTable(list);
                
            }
        });
        LovoButton addButton=new LovoButton("添加商品", 500, 200, this);
        addButton.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent arg0) {
                MainFrame.this.dispose();
                new AddFrame();
            }
        });
        LovoButton delButton=new LovoButton("删除", 500, 240, this);
        delButton.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent arg0) {
                //得到用户选择行的id号，如果没有选择行，返回-1
                int id=table.getKey();
                if(id==-1)
                {
                    JOptionPane.showMessageDialog(null, "请选择行");
                    return;
                }
                //调用业务方法删除
                service.del(id);

                List<ProductBean> list=service.findByItem("", null, null);
                table.updateLovoTable(list);
            }
        });
        
        LovoButton updateButton=new LovoButton("修改", 500, 280, this);
        updateButton.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent arg0) {
                int id=table.getKey();
                if(id==-1)
                {
                    JOptionPane.showMessageDialog(null, "请选择行");
                    return;
                }
                MainFrame.this.dispose();
                new updateFrame(id);
            }
        });
        this.setSize(700, 400);
        this.setVisible(true);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(3);
    }
        
        
    public static void main(String[] args) {
        MainFrame m=new MainFrame();

    }

}
package com.project.frame;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Date;

import javax.swing.JFrame;

import com.lovo.netCRM.component.LovoButton;
import com.lovo.netCRM.component.LovoTxt;
import com.project.bean.ProductBean;
import com.project.service.IProductService;
import com.project.service.Impl.ProductSreviceImpl;

public class AddFrame extends JFrame {
    /** 商品名文本框 */
    private LovoTxt nameTxt = new LovoTxt("商品名", 50, 50, this);
    /** 商品价格 文本框 */
    private LovoTxt priceTxt = new LovoTxt("商品价格", 50, 100, this);
    /** 商品产地文本框 */
    private LovoTxt addressTxt = new LovoTxt("商品产地", 50, 150, this);
    /** 生产日期文本框 */
    private LovoTxt dateTxt = new LovoTxt("生产日期", 50, 200, this);
    private IProductService service=new ProductSreviceImpl();
    public AddFrame() {
        this.setLayout(null);
        LovoButton addButton = new LovoButton("添加", 100, 250, this);
        addButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                if(check()==false)
                {
                    return;
                }
                //界面数据封装成实体对象
                ProductBean bean=new ProductBean();
                System.out.println(nameTxt.getText());
                bean.setName(nameTxt.getText());
                bean.setPrice(Integer.parseInt(priceTxt.getText()));
                bean.setAddress(addressTxt.getText());
                bean.setCreateDate(Date.valueOf(dateTxt.getText()));
                //调用业务方法完成添加
                service.add(bean);
                //卸载窗体
                AddFrame.this.dispose();
                //产生新窗体
                new MainFrame();
            }
        });

        this.setSize(300, 400);
        this.setVisible(true);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(3);
    }
    private boolean check()
    {
        String info="";
        if(nameTxt.getText().matches("[\w\u4e00-\u9fa5]{2,}")==false)
        {
            info+="商品为两个以上的字母、数字、汉子
";
        }
        if(priceTxt.getText().matches("\d+")==false)
        {
            info+="单价必须为数字
";
        }
        if(addressTxt.getText().matches("[\w\u4e00-\u9fa5]{2,}")==false)
        {
            info+="产地必须为两个以上的汉子
";
        }
        if(dateTxt.getText().matches("\d{4}-\d{2}-\d{2}")==false)
        {
            info+="日期格式XXXX-XX-XX";
        }
        if(info.length()!=0)
        {
            return false;
        }
        return true;
        
    }
    
}
package com.project.frame;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;

import com.lovo.netCRM.component.LovoButton;
import com.lovo.netCRM.component.LovoLabel;
import com.lovo.netCRM.component.LovoTxt;
import com.project.bean.ProductBean;
import com.project.service.IProductService;
import com.project.service.Impl.ProductSreviceImpl;

public class updateFrame extends JFrame {
    private LovoLabel nameLabel = new LovoLabel("商品名", 50, 20, this);
    private LovoTxt priceTxt = new LovoTxt("商品单价", 50, 70, this);
    private LovoLabel addressLabel = new LovoLabel("商品产地", 50, 120, this);
    private LovoLabel dateLabel = new LovoLabel("生产日期", 50, 170, this);
    private IProductService service = new ProductSreviceImpl();
    /** 需要修改商品的id */
    private int productId;

    public updateFrame(int id) {
        this.productId = id;

        this.setLayout(null);
        this.init();
        LovoButton updataButton = new LovoButton("修改", 100, 220, this);
        updataButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                service.update(productId, Integer.parseInt(priceTxt.getText()));
                updateFrame.this.dispose();
                new MainFrame();
                
            }
        });
        this.setSize(400, 300);
        this.setVisible(true);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(3);
    }

    /**
     * 初始化
     */
    public void init() {
        // 按id得到需要修改的商品对象，将商品对象的属性值填充文本
        ProductBean bean = service.findById(productId);
        nameLabel.setText(bean.getName());
        priceTxt.setText(bean.getPrice() + "");
        addressLabel.setText(bean.getAddress());
        dateLabel.setText(bean.getCreateDate().toString());
    }

}

以上为代码实现，很多都是之前学过的并且应该掌握的知识，只要理解参透这些学过的知识，在写的时候思路清晰且明确，那么代码实现是很简单的，注意每个流程实现的细节。

以及注意三层架构数据传递的方式。