前些天发现了一个巨牛的人工智能学习网站，通俗易懂，风趣幽默，忍不住分享一下给大家。点击跳转到教程。
实现的功能：
Java实现Excel导入数据库，如果存在就更新数据库中的数据导入到Excel
1、添加jxl.jarmysql-connector-java.1.7-bin.jar包到项目的lib目录下
2、Excel文件目录:D://book.xls
3、数据库名：javenforexcel
4、表名:stu
5、编写类：连接mysql的字符串方法、插入的方法、实体类
表结构如下 ：
连接数据库的工具类
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("装载 JDBC/ODBC 驱动程序失败。" ); e.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch blockSystem.err.println("无法连接数据库" ); e.printStackTrace();}}// 查询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;}// 增删修改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;}}
表的实体如下
package com.javen.entity;/*** @author Javen* @Email zyw205@* */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;}}
Java实现Excel导入数据核心类读取Excel表中所有的数据、操作数据（查询、更新）
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@* */public class StuService {/*** 查询stu表中所有的数据* @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;}/*** 查询指定目录中电子表格中所有的数据* @param file 文件完整路径* @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++) {//第一个是列数，第二个是行数String id=rs.getCell(j++, i).getContents();//默认最左边编号也算一列 所以这里得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;}/*** 通过Id判断是否存在* @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));}}
数据的数据导入到Excel表
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;// 创建可写入的Excel工作簿String fileName = "D://book.xls";File file=new File(fileName);if (!file.exists()) {file.createNewFile();}//以fileName为文件名来创建一个Workbookwwb = Workbook.createWorkbook(file);// 创建工作表WritableSheet ws = wwb.createSheet("Test Shee 1", 0);//查询数据库中所有的数据List<StuEntity> list= StuService.getAllByDb();//要插入到的Excel表格的行号，默认从0开始Label labelId= new Label(0, 0, "编号(id)");//表示第Label labelName= new Label(1, 0, "姓名(name)");Label labelSex= new Label(2, 0, "性别(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);}//写进文档wwb.write();// 关闭Excel工作簿对象wwb.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} }}
Excel表中的数据导入到MySql数据库
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@* */public class TestExcelToDb {public static void main(String[] args) {//得到表格中所有的数据List<StuEntity> listExcel=StuService.getAllByExcel("d://book.xls");/*//得到数据库表中所有的数据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);}}}}
源代码下载地址/detail/zyw_java/7430807
如果觉得《Java实现Excel导入数据库 数据库中的数据导入到Excel》对你有帮助，请点赞、收藏，并留下你的观点哦！
