package com.javen.db;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;public class DBhepler {/*String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";String url = "jdbc:sqlserver://127.0.0.1;DatabaseName=javenforexcel";*/String driver = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://127.0.0.1:3306/javenforexcel";Connection con = null;ResultSet res = null;public void DataBase() {try {Class.forName(driver);con = DriverManager.getConnection(url, "root", "root");} catch (ClassNotFoundException e) {// TODO Auto-generated catch blockSystem.err.println("裝載 JDBC/ODBC 驅動程序失敗。" );  e.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch blockSystem.err.println("無法連接數據庫" ); e.printStackTrace();}}// 查詢public ResultSet  Search(String sql, String str[]) {DataBase();try {PreparedStatement pst =con.prepareStatement(sql);if (str != null) {for (int i = 0; i < str.length; i++) {pst.setString(i + 1, str[i]);}}res = pst.executeQuery();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return res;}// 增刪修改public int AddU(String sql, String str[]) {int a = 0;DataBase();try {PreparedStatement pst = con.prepareStatement(sql);if (str != null) {for (int i = 0; i < str.length; i++) {pst.setString(i + 1, str[i]);}}a = pst.executeUpdate();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return a;}}

package com.javen.entity;/*** @author Javen* @Email zyw205@gmail.com* */
public class StuEntity {private int id;private String name;private String sex;private int num;public StuEntity() {}public StuEntity(int id, String name, String sex, int num) {this.id = id;this.name = name;this.sex = sex;this.num = num;}@Overridepublic String toString() {return "StuEntity [id=" + id + ", name=" + name + ", sex=" + sex+ ", num=" + num + "]";}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 String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getNum() {return num;}public void setNum(int num) {this.num = num;}}

package com.javen.service;import java.io.File;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;import jxl.Sheet;
import jxl.Workbook;import com.javen.db.DBhepler;
import com.javen.entity.StuEntity;/*** @author Javen* @Email zyw205@gmail.com* */
public class StuService {/*** 查詢stu表中所有的數據* @return */public static List<StuEntity> getAllByDb(){List<StuEntity> list=new ArrayList<StuEntity>();try {DBhepler db=new DBhepler();String sql="select * from stu";ResultSet rs= db.Search(sql, null);while (rs.next()) {int id=rs.getInt("id");String name=rs.getString("name");String sex=rs.getString("sex");int num=rs.getInt("num");//System.out.println(id+" "+name+" "+sex+ " "+num);list.add(new StuEntity(id, name, sex, num));}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return list;}/*** 查詢指定目錄中電子表格中所有的數據* @param file 文件完整路徑* @return*/public static List<StuEntity> getAllByExcel(String file){List<StuEntity> list=new ArrayList<StuEntity>();try {Workbook rwb=Workbook.getWorkbook(new File(file));Sheet rs=rwb.getSheet("Test Shee 1");//或者rwb.getSheet(0)int clos=rs.getColumns();//得到所有的列int rows=rs.getRows();//得到所有的行System.out.println(clos+" rows:"+rows);for (int i = 1; i < rows; i++) {for (int j = 0; j < clos; j++) {//第一個是列數，第二個是行數String id=rs.getCell(j++, i).getContents();//默認最左邊編號也算一列 所以這里得j++String name=rs.getCell(j++, i).getContents();String sex=rs.getCell(j++, i).getContents();String num=rs.getCell(j++, i).getContents();System.out.println("id:"+id+" name:"+name+" sex:"+sex+" num:"+num);list.add(new StuEntity(Integer.parseInt(id), name, sex, Integer.parseInt(num)));}}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} return list;}/*** 通過Id判斷是否存在* @param id* @return*/public static boolean isExist(int id){try {DBhepler db=new DBhepler();ResultSet rs=db.Search("select * from stu where id=?", new String[]{id+""});if (rs.next()) {return true;}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return false;}public static void main(String[] args) {/*List<StuEntity> all=getAllByDb();for (StuEntity stuEntity : all) {System.out.println(stuEntity.toString());}*/System.out.println(isExist(1));}}

package com.javen.excel;import java.io.File;
import java.util.List;import com.javen.entity.StuEntity;
import com.javen.service.StuService;import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;public class TestDbToExcel {public static void main(String[] args) {try {WritableWorkbook wwb = null;// 創建可寫入的Excel工作簿String fileName = "D://book.xls";File file=new File(fileName);if (!file.exists()) {file.createNewFile();}//以fileName為文件名來創建一個Workbookwwb = Workbook.createWorkbook(file);// 創建工作表WritableSheet ws = wwb.createSheet("Test Shee 1", 0);//查詢數據庫中所有的數據List<StuEntity> list= StuService.getAllByDb();//要插入到的Excel表格的行號，默認從0開始Label labelId= new Label(0, 0, "編號(id)");//表示第Label labelName= new Label(1, 0, "姓名(name)");Label labelSex= new Label(2, 0, "性別(sex)");Label labelNum= new Label(3, 0, "薪水(num)");ws.addCell(labelId);ws.addCell(labelName);ws.addCell(labelSex);ws.addCell(labelNum);for (int i = 0; i < list.size(); i++) {Label labelId_i= new Label(0, i+1, list.get(i).getId()+"");Label labelName_i= new Label(1, i+1, list.get(i).getName());Label labelSex_i= new Label(2, i+1, list.get(i).getSex());Label labelNum_i= new Label(3, i+1, list.get(i).getNum()+"");ws.addCell(labelId_i);ws.addCell(labelName_i);ws.addCell(labelSex_i);ws.addCell(labelNum_i);}//寫進文檔wwb.write();// 關閉Excel工作簿對象wwb.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} }
}

package com.javen.excel;import java.util.List;import com.javen.db.DBhepler;
import com.javen.entity.StuEntity;
import com.javen.service.StuService;/*** @author Javen* @Email zyw205@gmail.com* */
public class TestExcelToDb {public static void main(String[] args) {//得到表格中所有的數據List<StuEntity> listExcel=StuService.getAllByExcel("d://book.xls");/*//得到數據庫表中所有的數據List<StuEntity> listDb=StuService.getAllByDb();*/DBhepler db=new DBhepler();for (StuEntity stuEntity : listExcel) {int id=stuEntity.getId();if (!StuService.isExist(id)) {//不存在就添加String sql="insert into stu (name,sex,num) values(?,?,?)";String[] str=new String[]{stuEntity.getName(),stuEntity.getSex(),stuEntity.getNum()+""};db.AddU(sql, str);}else {//存在就更新String sql="update stu set name=?,sex=?,num=? where id=?";String[] str=new String[]{stuEntity.getName(),stuEntity.getSex(),stuEntity.getNum()+"",id+""};db.AddU(sql, str);}}}
}