JAVA项目之增删改查

public class ProductDao {
    // 查询所有商品
    
    // BeanListHandler查询所有商品
    public List<Product> getAll() throws SQLException {
        QueryRunner qr = new QueryRunner(MyDBUtils.getDataSource());
        String sql = "select * from product";
        List<Product> arr = qr.query(sql, new BeanListHandler<Product>(Product.class));
        return arr;
    }

    // 添加商品
    public void add(Product product) throws SQLException {
        QueryRunner qr = new QueryRunner(MyDBUtils.getDataSource());
        String sql = "insert into product(pid,pname,market_price,shop_price,pdate,pdesc,is_hot,cid) values(?,?,?,?,?,?,?,?)";
        Object[] obj = { product.getPid(), product.getPname(), product.getMarket_price(), product.getShop_price(),
                product.getPdate(), product.getPdesc(), product.getIs_hot(), product.getCid() };
        // 执行sql
        qr.update(sql, obj);

    }

    // 根据pid查询商品--就一条记录--用BeanHandler
    public Product getProductById(String pid) throws SQLException {
        QueryRunner qr = new QueryRunner(MyDBUtils.getDataSource());
        String sql = "select * from product where pid = ?";
        Product product = qr.query(sql, new BeanHandler<Product>(Product.class), pid);
        return product;
    }
    //根据pid修改商品
    public void edit(Product product) throws SQLException{
        QueryRunner qr = new QueryRunner(MyDBUtils.getDataSource());
        String sql ="update product set pname = ?,market_price = ?,shop_price =?,pdesc =?,is_hot=?,cid=? where pid =?";
        Object[] obj = { product.getPname(), product.getMarket_price(), product.getShop_price(), product.getPdesc(), product.getIs_hot(), product.getCid(),product.getPid()};
        qr.update(sql,obj);
    }
    //根据pid删除商品
    public void delete(String pid) throws SQLException{
        QueryRunner qr = new QueryRunner(MyDBUtils.getDataSource());
        String sql = "delete from product where pid =?";
        qr.update(sql,pid);
    }
    
}

package com.oracle.service;

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

import com.oracle.dao.ProductDao;
import com.oracle.domain.Product;

public class ProductService {
    private ProductDao productDao = new ProductDao();
    //查询所有商品
    public List<Product> getAll(){
        List<Product> arr = null;
        try {
            arr=productDao.getAll();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return arr;
        
    }
    //添加商品
        public void add(Product product){
            try {
                productDao.add(product);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }            
        }
    //根据pid查询商品
        public Product getProductById(String pid){
            Product product = null;
            try {
                product =productDao.getProductById(pid);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return product;
        }
        //根据pid修改商品
        public void edit(Product product){
            try {
                productDao.edit(product);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        //根据pid删除商品
        public void delete(String pid){
            try {
                productDao.delete(pid);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
}

package com.oracle.web;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

import com.oracle.domain.Product;
import com.oracle.service.ProductService;
//增加
public class AddProductServlet extends HttpServlet {
    private ProductService productService =new ProductService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //解决乱码
        request.setCharacterEncoding("UTF-8");
        //获取所有参数的map
        Map<String,String[]> map = request.getParameterMap();
        //创建product对象
        Product product = new Product();
        //用BeanUtils进行封装
        try {
            BeanUtils.populate(product, map);
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //设置pid
        //uuid是个类，--返回36位的不重复的字母加数字--转成字符串
        product.setPid(UUID.randomUUID().toString());
        //设置pdate
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String d = sdf.format(date);
        product.setPdate(d);
        //调用Service方法
        productService.add(product);
        response.sendRedirect(request.getContextPath()+"/AdminProductListServlet");
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

package com.oracle.web;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oracle.service.ProductService;
//删除
public class DeleteProductServlet extends HttpServlet {
private ProductService productService=new ProductService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取pid
        String pid =request.getParameter("pid");
        //调用service方法
        productService.delete(pid);
        //重定向
        response.sendRedirect(request.getContextPath() + "/AdminProductListServlet");
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

package com.oracle.web;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

import com.oracle.domain.Product;
import com.oracle.service.ProductService;
//修改
public class AdiminEditProductServlet extends HttpServlet {
    private ProductService productService = new ProductService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //解决乱码
        request.setCharacterEncoding("UTf-8");
        //获取所有参数MAP
        Map<String,String[]> map = request.getParameterMap();
        //创建product对象
        Product product = new Product();
        //用BeanUtils进行封装
        try {
            BeanUtils.populate(product, map);
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //调用service方法
        productService.edit(product);
        //这时候已经修改完了，不需要调数据了，只是去页面上查看下数据修改完后的样子
        //重定向
        response.sendRedirect(request.getContextPath()+"/AdminProductListServlet");
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

package com.oracle.web;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oracle.domain.Product;
import com.oracle.service.ProductService;
//查
public class AdminProductListServlet extends HttpServlet {
    // 后台的商品列表页面
    private ProductService productService = new ProductService();

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取商品列表
        List<Product> list = productService.getAll();
        // 向域中存list
        request.setAttribute("ProductList", list);
        // 请求转发
        request.getRequestDispatcher("/admin/product/list.jsp").forward(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

 

来源：oschina

链接：https://my.oschina.net/u/4373914/blog/3466640