java- 综合实例-增删查改查，删除多项，分页，令牌机制

重点内容：分页、令牌机制（重定向下防止重复提交）、使用c3p0连接数据库（以及数据库连接类）

项目结构：

类：

项目展示：

数据库：

/*
SQLyog Ultimate v12.09 (64 bit)
MySQL - 5.5.53 : Database - phone_store
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`phone_store` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `phone_store`;

/*Table structure for table `phone` */

DROP TABLE IF EXISTS `phone`;

CREATE TABLE `phone` (
  `id` varchar(255) NOT NULL COMMENT '主键',
  `name` varchar(255) NOT NULL COMMENT '名称',
  `price` double NOT NULL COMMENT '价格',
  `mark` varchar(255) DEFAULT NULL COMMENT '简介'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/*Data for the table `phone` */

insert  into `phone`(`id`,`name`,`price`,`mark`) values ('9DE38AA976B34441B1511C0266B07F00','phone555555',2323.43,'1phone1mark顶顶顶顶'),('E0923B7C3CC1434B8E2BF55EB47195BE','phone555555',2323.43,'2阿达是的发送到发送的'),('13BAEC11CB0D4789BC935B47C396A81D','张三',234.322222222,'3阿达是的发送到发送的顶顶顶'),('178B12C84D6E4C1583BC71735F3683FC','phone555555',234.32,'4phone1mark顶顶顶顶'),('5DC9D361571B4B9EAD545B57819B7BE0','phone555555',21341,'5小米手机'),('9E0B9164FE564A51BC61141017792BF3','phone555555',21341,'6小米手机'),('A8936D9946B04FBFA543463F35B0A587','phone555555',2323.43,'7阿达是的发送到发送的'),('C623F1FB4A2E4D7FBBF6109BF1DE0471','张三',2323.43,'8阿达是的发送到发送的'),('6184E8770C5B471E91EDDBE6B2632DE4','phone555555',2323.43,'9phone1mark顶顶顶顶'),('9DE38AA976B34441B1511C0266B07F00','phone555555',2323.43,'1phone1mark顶顶顶顶'),('E0923B7C3CC1434B8E2BF55EB47195BE','phone555555',2323.43,'2阿达是的发送到发送的'),('13BAEC11CB0D4789BC935B47C396A81D','张三',234.322222222,'3阿达是的发送到发送的顶顶顶'),('178B12C84D6E4C1583BC71735F3683FC','phone555555',234.32,'4phone1mark顶顶顶顶'),('5DC9D361571B4B9EAD545B57819B7BE0','phone555555',21341,'5小米手机'),('9E0B9164FE564A51BC61141017792BF3','phone555555',21341,'6小米手机'),('A8936D9946B04FBFA543463F35B0A587','phone555555',2323.43,'7阿达是的发送到发送的'),('C623F1FB4A2E4D7FBBF6109BF1DE0471','张三',2323.43,'8阿达是的发送到发送的'),('6184E8770C5B471E91EDDBE6B2632DE4','phone555555',2323.43,'9phone1mark顶顶顶顶');

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

src/dao/AddDataDao.java:

package com.gordon.dao;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;

import com.gordon.domain.Phone;
import com.gordon.utils.DataSourceUtils;

public class AddDataDao {

	public void addData(Phone phone) throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "insert into phone (id, name, price, mark) values (?,?,?,?)";
		qr.update(sql, phone.getId(), phone.getName(), phone.getPrice(), phone.getMark());
	}
}

 src/dao/DeleteDataDao.java:

package com.gordon.dao;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;

import com.gordon.utils.DataSourceUtils;

public class DeleteDataDao {
	
	/**
	 * 根据id删除数据
	 * @param id
	 * @throws SQLException 
	 */
	public void deleteDataById(String id) throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "delete from phone where id = ?";
		qr.update(sql, id);
	}

}

 src/dao/GetDataDao.java:

package com.gordon.dao;

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

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import com.gordon.domain.Phone;
import com.gordon.utils.DataSourceUtils;

public class GetDataDao {

	/**
	 * 获取所有数据
	 * 
	 * @return
	 * @throws SQLException
	 */
	public List<Phone> getAllData() throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select * from phone";
		return qr.query(sql, new BeanListHandler<Phone>(Phone.class));
	}

	/**
	 * 根据id获取数据
	 * 
	 * @param id
	 * @return
	 * @throws SQLException
	 */
	public Phone getDataById(String id) throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select * from phone where id = ?";
		return qr.query(sql, new BeanHandler<Phone>(Phone.class), id);
	}

	/**
	 * 根据关键词查询信息
	 * 
	 * @param category
	 * @param keyword
	 * @return
	 * @throws SQLException
	 */
	public List<Phone> getDataByKeyword(String category, String keyword) throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select * from phone where 1 = 1 ";

		ArrayList<String> arrayList = new ArrayList<>();

		if (category != null && category.trim().length() > 0) {
			sql += " and mark like ? ";
			arrayList.add("%" + category + "%");
		}

		if (keyword != null && keyword.trim().length() > 0) {
			sql += " and mark like ? ";
			arrayList.add("%" + keyword + "%");
		}

		return qr.query(sql, new BeanListHandler<Phone>(Phone.class), arrayList.toArray());
	}

	/**
	 * 分页查询
	 * 
	 * @param start
	 * @param page_size
	 * @return
	 * @throws SQLException
	 */
	public List<Phone> getDataByLimit(int start, int page_size) throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select * from phone limit ?, ?";
		return qr.query(sql, new BeanListHandler<Phone>(Phone.class), start, page_size);
	}

	/**
	 * 获取查询数据总条数
	 * 
	 * @return
	 * @throws SQLException
	 * @throws NumberFormatException
	 */
	public int getDataTotalCount() throws NumberFormatException, SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select count(*) from phone";
		return Integer.valueOf(qr.query(sql, new ScalarHandler(1)).toString());
	}
}

 src/dao/UpdateDataDao.java:

package com.gordon.dao;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;

import com.gordon.domain.Phone;
import com.gordon.utils.DataSourceUtils;

public class UpdateDataDao {

	/**
	 * 根据id更新数据
	 * 
	 * @param phone
	 * @throws SQLException 
	 */
	public void updateDataById(Phone phone) throws SQLException {
		QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "update phone set name = ?, price = ?, mark = ? where id = ?";
		qr.update(sql, phone.getName(), phone.getPrice(), phone.getMark(), phone.getId());
	}

}

 ---------------------------------------------------------------------

 src/domain/Page.java:

package com.gordon.domain;

import java.util.List;

public class Page<T> {
	private List<T> list = null; // 存储每一页的数据
	private int curr_page = 1; // 当前页数
	private int page_size = 2; // 每一页大小
	private int total_page = 0; // 总页数
	private int total_count = 0; // 总记录条数
	
	// 显示页码时，当前页码前后要显示的页数。
	// 如，show_page=2，且当前页是第5页，则前面显示3,4 后面显示6,7其余页不显示。
	private int show_page = 3;

	public int getShow_page() {
		return show_page;
	}

	public void setShow_page(int show_page) {
		this.show_page = show_page;
	}

	public List<T> getList() {
		return list;
	}

	public void setList(List<T> list) {
		this.list = list;
	}

	public int getCurr_page() {
		return curr_page;
	}

	public void setCurr_page(int curr_page) {
		this.curr_page = curr_page;
	}

	public int getPage_size() {
		return page_size;
	}

	public void setPage_size(int page_size) {
		this.page_size = page_size;
	}

	public int getTotal_page() {
		this.total_page = (int) Math.ceil((total_count * 1.0) / page_size);
		return total_page;
	}

	public void setTotal_page(int total_page) {
		this.total_page = total_page;
	}

	public int getTotal_count() {
		return total_count;
	}

	public void setTotal_count(int total_count) {
		this.total_count = total_count;
	}
}

src/domain/Phone.java:

package com.gordon.domain;

public class Phone {
	private String id;
	private String name;
	private Double price;
	private String mark;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Double getPrice() {
		return price;
	}

	public void setPrice(Double price) {
		this.price = price;
	}

	public String getMark() {
		return mark;
	}

	public void setMark(String mark) {
		this.mark = mark;
	}
}

 ---------------------------------------------------------------------

src/service/AddDataService.java:

package com.gordon.service;

import java.sql.SQLException;

import com.gordon.dao.AddDataDao;
import com.gordon.domain.Phone;

public class AddDataService {

	/**
	 * 添加一条数据
	 * @param phone
	 * @throws SQLException
	 */
	public void addData(Phone phone) throws SQLException {
		new AddDataDao().addData(phone);
	}
}

src/service/DeleteDataService.java:

package com.gordon.service;

import java.sql.SQLException;

import com.gordon.dao.DeleteDataDao;

public class DeleteDataService {

	/**
	 * 根据id删除数据
	 * 
	 * @param id
	 * @throws SQLException
	 */
	public void deleteDataById(String id) throws SQLException {
		new DeleteDataDao().deleteDataById(id);
	}

}

src/service/GetDataService.java:

package com.gordon.service;

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

import com.gordon.dao.GetDataDao;
import com.gordon.domain.Phone;

public class GetDataService {

	/**
	 * 获取所有数据
	 * 
	 * @return
	 * @throws SQLException
	 */
	public List<Phone> getAllData() throws SQLException {
		return new GetDataDao().getAllData();
	}

	/**
	 * 根据id获取数据
	 * 
	 * @param id
	 * @return
	 * @throws SQLException
	 */
	public Phone getDataById(String id) throws SQLException {
		return new GetDataDao().getDataById(id);
	}

	/**
	 * 根据关键词查询数据
	 * 
	 * @param category
	 * @param keyword
	 * @return
	 * @throws SQLException
	 */
	public List<Phone> getDataByKeyword(String category, String keyword) throws SQLException {
		return new GetDataDao().getDataByKeyword(category, keyword);
	}

	/**
	 * 分页查询
	 * 
	 * @param start
	 * @param page_size
	 * @return
	 * @throws SQLException
	 */

	public List<Phone> getDataByLimit(int start, int page_size) throws SQLException {
		return new GetDataDao().getDataByLimit(start, page_size);
	}

	
	/**
	 * 获取查询数据总条数
	 * @return
	 * @throws SQLException 
	 * @throws NumberFormatException 
	 */
	public int getDataTotalCount() throws NumberFormatException, SQLException {
		return new GetDataDao().getDataTotalCount();
	}
}

src/service/UpdateDataService.java:

package com.gordon.service;

import java.sql.SQLException;

import com.gordon.dao.UpdateDataDao;
import com.gordon.domain.Phone;

public class UpdateDataService {

	/**
	 * 更新数据
	 * @param phone
	 * @throws SQLException 
	 */
	public void updateDataById(Phone phone) throws SQLException {
		new UpdateDataDao().updateDataById(phone);
	}

}

 ---------------------------------------------------------------------

src/utils/DataSourceUtils.java:

package com.gordon.utils;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DataSourceUtils {
	private static ComboPooledDataSource ds=new ComboPooledDataSource();
	
	/**
	 * 获取数据源
	 * @return 连接池
	 */
	public static DataSource getDataSource(){
		return ds;
	}
	
	/**
	 * 获取连接
	 * @return 连接
	 * @throws SQLException
	 */
	public static Connection getConnection() throws SQLException{
		return ds.getConnection();
	}
	
	
	
	/**
	 * 释放资源
	 * 
	 * @param conn
	 *            连接
	 * @param st
	 *            语句执行者
	 * @param rs
	 *            结果集
	 */
	public static void closeResource(Connection conn, Statement st, ResultSet rs) {
		closeResultSet(rs);
		closeStatement(st);
		closeConn(conn);
	}

	/**
	 * 释放连接
	 * 
	 * @param conn
	 *            连接
	 */
	public static void closeConn(Connection conn) {
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			conn = null;
		}

	}

	/**
	 * 释放语句执行者
	 * 
	 * @param st
	 *            语句执行者
	 */
	public static void closeStatement(Statement st) {
		if (st != null) {
			try {
				st.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			st = null;
		}

	}

	/**
	 * 释放结果集
	 * 
	 * @param rs
	 *            结果集
	 */
	public static void closeResultSet(ResultSet rs) {
		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			rs = null;
		}

	}
}

src/utils/RandomNumber.java:

package com.gordon.utils;

import java.util.UUID;

public class RandomNumber {
	public static String getRandomId() {
		return UUID.randomUUID().toString().replace("-", "").toUpperCase();
	}
}

 ---------------------------------------------------------------------

src/web.servlet/AddDataServlet.java:

package com.gordon.web.servlet;

import java.io.IOException;

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

import org.apache.commons.beanutils.BeanUtils;

import com.gordon.domain.Phone;
import com.gordon.service.AddDataService;
import com.gordon.utils.RandomNumber;

/**
 * 添加用户数据
 */
@WebServlet("/addData")
public class AddDataServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public AddDataServlet() {
		super();
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8;");
		
		// 判断是否为重复提交
		String r_token = request.getParameter("r_token");
		String s_token = (String) request.getSession().getAttribute("s_token");
		
		//清除s_token，以便于重新生成。
		request.getSession().removeAttribute("s_token");
		
		// 判断session中是否存在Token，并且是否与客户端Token相同，不同则不是同一次请求。
		if(s_token == null || !s_token.equals(r_token)) {
			request.setAttribute("msg", "重复提交！");
			request.getRequestDispatcher("/msg.jsp").forward(request, response);
			return;
		}
		
		try {
			Phone phone = new Phone();
			BeanUtils.populate(phone, request.getParameterMap());
			BeanUtils.setProperty(phone, "id", RandomNumber.getRandomId());
			new AddDataService().addData(phone);
		} catch (Exception e) {
			e.printStackTrace();
		}

		
		/**
		 * 使用请求转发，会导致数据重复提交。
		 * 两种解决方法：
		 * 	1.使用重定向 sendRedirect()。但是不能再同意请求内传递数据，最好使用令牌技术.
		 *  2.使用令牌技术
		 */
		
		request.getRequestDispatcher("/getAllData").forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

src/web.servlet/DeleteDataByIdServlet.java:

package com.gordon.web.servlet;

import java.io.IOException;
import java.sql.SQLException;

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

import com.gordon.service.DeleteDataService;

/**
 * 根据id删除数据
 */
@WebServlet("/deleteDataById")
public class DeleteDataByIdServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public DeleteDataByIdServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		String id = request.getParameter("id");
		try {
			new DeleteDataService().deleteDataById(id);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		response.sendRedirect(request.getContextPath() + "/getAllData");
	}

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

}

src/web.servlet/DeleteMultipleDataByIdServlet.java:

package com.gordon.web.servlet;

import java.io.IOException;
import java.sql.SQLException;

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

import com.gordon.service.DeleteDataService;

/**
 * 删除多项数据
 */
@WebServlet("/deleteMultipleDataByIds")
public class DeleteMultipleDataByIdsServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public DeleteMultipleDataByIdsServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String[] ids = request.getParameterValues("ids");

		try {
			for (int i = 0; i < ids.length; i++) {
				new DeleteDataService().deleteDataById(ids[i]);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		response.sendRedirect(request.getContextPath() + "/getAllData");
	}

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

}

src/web.servlet/GetAllDataServlet.java:

package com.gordon.web.servlet;

import java.io.IOException;

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

import com.gordon.domain.Page;
import com.gordon.domain.Phone;
import com.gordon.service.GetDataService;

/**
 * 获取所有数据
 */
@WebServlet("/getAllData")
public class GetAllDataServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public GetAllDataServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");

		Page<Phone> page_phone = new Page<Phone>();
		
		try {
			// 当前页，不存在默认为 1
			int curr_page = (request.getParameter("page") == null) ? 1 : Integer.valueOf(request.getParameter("page"));
			page_phone.setCurr_page(curr_page);

			// 总条数
			page_phone.setTotal_count(new GetDataService().getDataTotalCount());
			
			// 开始位置&每页大小
			int start = (Integer.valueOf(curr_page) - 1) * page_phone.getPage_size();
			int pagesize = page_phone.getPage_size();
			
			// 设置获取的结果集
			page_phone.setList(new GetDataService().getDataByLimit(start, pagesize));
		} catch (Exception e) {
			e.printStackTrace();
		}

		// 向域中传递Page&list对象
		request.setAttribute("list", page_phone.getList()); // 数据集
		request.setAttribute("page", page_phone);	//page对象
		
		request.getRequestDispatcher("/show_data.jsp").forward(request, response);
	}

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

src/web.servlet/GetDataByIdServlet.java:

package com.gordon.web.servlet;

import java.io.IOException;
import java.sql.SQLException;

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

import com.gordon.domain.Phone;
import com.gordon.service.GetDataService;

/**
 * 根据id获取数据，并转发到修改数据页面
 */
@WebServlet("/getDataById")
public class GetDataByIdServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public GetDataByIdServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		
		String id = request.getParameter("id");
		
		Phone phone = null;
		try {
			phone = new GetDataService().getDataById(id);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		request.setAttribute("phone", phone);
		
		request.getRequestDispatcher("/update_data.jsp").forward(request, response);
	}

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

}

src/web.servlet/GetDataByKeyword.java:

package com.gordon.web.servlet;

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

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

import com.gordon.domain.Phone;
import com.gordon.service.GetDataService;

/**
 * 根据关键字查询数据库
 */
@WebServlet("/getDataByKeyword")
public class GetDataByKeywordServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public GetDataByKeywordServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		
		String category = request.getParameter("category");
		String keyword = request.getParameter("keyword");
		
		List<Phone> plist = null;
		try {
			plist = new GetDataService().getDataByKeyword(category, keyword);
		} catch (SQLException e) {
			e.printStackTrace();
		}

		request.setAttribute("list", plist);
		
		request.getRequestDispatcher("/show_data.jsp").forward(request, response);
	}

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

}

src/web.servlet/UpdateDataByIdServlet.java:

package com.gordon.web.servlet;

import java.io.IOException;

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

import org.apache.commons.beanutils.BeanUtils;

import com.gordon.domain.Phone;
import com.gordon.service.UpdateDataService;

/**
 * 修改数据
 */
@WebServlet("/updateDataById")
public class UpdateDataByIdServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public UpdateDataByIdServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");
		try {
			Phone phone = new Phone();
			BeanUtils.populate(phone, request.getParameterMap());

			new UpdateDataService().updateDataById(phone);
		} catch (Exception e) {
			e.printStackTrace();
		}

		response.sendRedirect(request.getContextPath() + "/getAllData");

	}

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

}

---------------------------------------------------------------------

c3po-config.xml

<c3p0-config>
	<!-- 默认配置，如果没有指定则使用这个配置 -->
	<default-config>
		<!-- 基本配置 -->
		<property name="driverClass">com.mysql.jdbc.Driver</property>
		<property name="jdbcUrl">jdbc:mysql://localhost:3306/phone_store</property>
		<property name="user">root</property>
		<property name="password">root</property>
	
		<!--扩展配置-->
		<property name="checkoutTimeout">30000</property>
		<property name="idleConnectionTestPeriod">30</property>
		<property name="initialPoolSize">10</property>
		<property name="maxIdleTime">30</property>
		<property name="maxPoolSize">100</property>
		<property name="minPoolSize">10</property>
		<property name="maxStatements">200</property>
	</default-config> 
	
	
	<!-- 命名的配置 -->
	<named-config name="itcast">
		<property name="driverClass">com.mysql.jdbc.Driver</property>
		<property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/xxxx</property>
		<property name="user">root</property>
		<property name="password">1234</property>
		
		
		<!-- 如果池中数据连接不够时一次增长多少个 -->
		<property name="acquireIncrement">5</property>
		<property name="initialPoolSize">20</property>
		<property name="minPoolSize">10</property>
		<property name="maxPoolSize">40</property>
		<property name="maxStatements">20</property>
		<property name="maxStatementsPerConnection">5</property>
	</named-config>
</c3p0-config> 

---------------------------------------------------------------------

add_data.jsp

<%@page import="com.gordon.utils.RandomNumber"%>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		String randomToken = RandomNumber.getRandomId();
		request.getSession().setAttribute("s_token", randomToken);
	%>
	<form action="${ pageContext.request.contextPath }/addData" method="post">
		<input type="hidden" name="r_token" value="<%= randomToken %>">
		<table border="1" align="center">
			<tr>
				<td>名称：</td>
				<td><input type="text" name="name"></td>
			</tr>
			<tr>
				<td>价格：</td>
				<td><input type="text" name="price"></td>
			</tr>
			<tr>
				<td>简介：</td>
				<td><input type="text" name="mark"></td>
			</tr>
			<tr>
				<td><input type="submit" value="提交"></td>
			</tr>
		</table>
	</form>
</body>
</html>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<a href="${ pageContext.request.contextPath }/getAllData">显示所有数据</a><br/>
	<a href="${ pageContext.request.contextPath }/add_data.jsp">添加数据</a><br/>
</body>
</html>

msg.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	${ msg }
</body>
</html>

show_data.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="${ pageContext.request.contextPath }/getDataByKeyword" method="post">
		<table border="1" align="center">
			<tr>
				<td colspan="5">分类查询：<input type="text" name="category">    关键字查询：<input
					type="text" name="keyword"></td>
				<td><input type="submit" value="查询"></td>
			</tr>
		</table>
	</form>

	<br>

	<form id="deleteMultipleForm" action="${ pageContext.request.contextPath }/deleteMultipleDataByIds"
		method="post">
		<table border="1" align="center">
			<tr>
				<td><input type="checkbox" onclick="allCheck(this)"></td>
				<td>ID</td>
				<td>名称</td>
				<td>价格</td>
				<td>简介</td>
				<td>操作</td>
			</tr>
			<c:forEach items="${ list }" var="p">
				<tr>
					<td><input type="checkbox" name="ids" value="${ p.id }"></td>
					<td>${ p.id }</td>
					<td>${ p.name }</td>
					<td>${ p.price }</td>
					<td>${ p.mark }</td>
					<td><a href="${ pageContext.request.contextPath }/getDataById?id=${ p.id }">修改</a> | <a
						href="javascript:void(0);" onclick="deleteData('${ p.id }')">删除</a></td>
				</tr>
			</c:forEach>
			<tr>
				<td colspan="6"><input type="button" onclick="deleteMultiple()" value="删除"></td>
			</tr>
		</table>
	</form>

	<br>

	<table border="1" align="center">
		<tr>
			<td colspan="5">

				
				<c:choose>
					<c:when test="${ empty page.list }">
						[首页][下一页][上一页][尾页]
					</c:when>
					<c:otherwise>
					
						<!-- 首页&上一页 -->
						<c:choose>
							<c:when test="${ page.curr_page == 1 }">
								[首页] [上一页]
							</c:when>
							<c:otherwise>
								<!-- 首页 -->
								<a href="${ pageContext.request.contextPath }/getAllData">[首页]</a>
		
								<!-- 上一页  -->
								<c:choose>
									<c:when test="${ (page.curr_page - 1) <= 0 }">
										<a href="${ pageContext.request.contextPath }/getAllData">[上一页]</a>
									</c:when>
									<c:otherwise>
										<a href="${ pageContext.request.contextPath }/getAllData?page=${ page.curr_page - 1 }">[上一页]</a>
									</c:otherwise>
								</c:choose>
							</c:otherwise>
						</c:choose>
		
		
						<!-- 显示页码 -->
						<c:set var="showpage" value="${ page.show_page }"></c:set>
						<!-- 计算起始位置 -->
						<c:choose>
							<c:when test="${ page.curr_page - showpage > 0}">
								<c:set var="start" value="${ page.curr_page - showpage }"></c:set>
							</c:when>
							<c:otherwise>
								<c:set var="start" value="1"></c:set>
							</c:otherwise>
						</c:choose>
						<!-- 计算结束位置 -->
						<c:choose>
							<c:when test="${ page.curr_page + showpage <= page.total_page }">
								<c:set var="end" value="${ page.curr_page + showpage }"></c:set>
							</c:when>
							<c:otherwise>
								<c:set var="end" value="${ page.total_page }"></c:set>
							</c:otherwise>
						</c:choose>
						<!-- 循环显示页码 -->
						<c:forEach begin="${ start }" end="${ end }" var="i">
							<c:choose>
								<c:when test="${ page.curr_page == i }">
									${ i }
								</c:when>
								<c:otherwise>
									<a href="${ pageContext.request.contextPath }/getAllData?page=${ i }">${ i }</a>
								</c:otherwise>
							</c:choose>
						</c:forEach>
						
						
						<!-- 下一页&尾页 -->
						<c:choose>
							<c:when test="${ page.curr_page == page.total_page }">
								[下一页] [尾页]
							</c:when>
							<c:otherwise>
								<!-- 下一页 -->
								<c:choose>
									<c:when test="${ (page.curr_page + 1) > page.total_page }">
										<a href="${ pageContext.request.contextPath }/getAllData?page=${ page.curr_page }">[下一页]
										</a>
									</c:when>
									<c:otherwise>
										<a href="${ pageContext.request.contextPath }/getAllData?page=${ page.curr_page + 1 }">[下一页]</a>
									</c:otherwise>
								</c:choose>
		
								<!-- 尾页 -->
								<a href="${ pageContext.request.contextPath }/getAllData?page=${ page.total_page }">[尾页]</a>
							</c:otherwise>
						</c:choose>
						
						
						<!-- 信息 -->
						第${ page.curr_page }页 / 共${ page.total_page }页
					</c:otherwise>
				</c:choose>
			</td>
		</tr>
	</table>


</body>
<script type="text/javascript">
	//根据id删除数据
	function deleteData(id) {
		if (confirm("确定删除吗？")) {
			window.location.href = "${ pageContext.request.contextPath }/deleteDataById?id="
					+ id;
		}
	}

	//全选/全不选
	function allCheck(this_obj) {
		var arrs = document.getElementsByName("ids");
		for (var i = 0; i < arrs.length; i++) {
			arrs[i].checked = this_obj.checked;
		}
	}

	//多选删除时，判断是否选中
	function deleteMultiple() {
		var flag = false;

		var arrs = document.getElementsByName("ids");
		for (var i = 0; i < arrs.length; i++) {
			if (arrs[i].checked) {
				flag = true;
				break;
			}
		}

		if (flag) {
			if (confirm("确定删除选中项目？")) {
				document.getElementById("deleteMultipleForm").submit();
			}
		} else {
			alert("请选择删除项目！");
		}
	}
</script>
</html>

update_data.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="${ pageContext.request.contextPath }/updateDataById" method="post">
		<input type="hidden" name="id" value="${ phone.id }">
		<table border="1" align="center">
			<tr>
				<td>名称：</td>
				<td><input type="text" name="name" value="${ phone.name }"></td>
			</tr>
			<tr>
				<td>价格：</td>
				<td><input type="text" name="price" value="${ phone.price }"></td>
			</tr>
			<tr>
				<td>简介：</td>
				<td><input type="text" name="mark" value="${ phone.mark }"></td>
			</tr>
			<tr>
				<td><input type="submit" value="修改"></td>
			</tr>
		</table>
	</form>
</body>
</html>