Java实现Excel导入数据库，数据库中的数据导入到Excel

连接数据库的工具类

package demo;
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 block
System.err.println("装载 JDBC/ODBC 驱动程序失败。");
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
System.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 block
e.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 block
e.printStackTrace();
}
return a;
}

}

表的实体如下

package demo;
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;
}

@Override
public 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 demo;



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;



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 block

e.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 block

e.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 block

e.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 demo;

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Workbook

               wwb = 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 block

            e.printStackTrace();

        } 

    }

}

Excel表中的数据导入到MySql数据库

package demo;

import java.util.List;



import com.javen.db.DBhepler;

import com.javen.entity.StuEntity;

import com.javen.service.StuService;

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);

            }

        }

    }

}