1》导入包

jxl.jar下载地址：https://pan.baidu.com/s/10ijORF5sNdmZv3SyN8ImaQ密码：ue50

mysql的对应jar：https://pan.baidu.com/s/1ZiB3kPewCdMK\_WatNjUtiA密码：7afv

源码:

新建类

public class excelTest {
    int id;
    String name;
    String num;
    public String getNum() {
        return num;
    }
    public void setNum(String num) {
        this.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;
    }
    
}

java代码：

import java.io.File;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Random;

import org.java.team.Writeteam;
import org.java.tianbao.Tianbao;
import org.java.util.DBUtil;
import org.java.xiaowailianjie.WriteXiaowailianjie;



import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

public class a {

      public static void main(String[] args) throws RowsExceededException, WriteException, IOException {
          
          //1. 导出Excel的路径
          String filePath = "C:/export.xls";
          WritableWorkbook wwb =null;
          Connection connection=DBUtil.getConnection();
            List<excelTest> excelTests=new ArrayList<excelTest>();
            PreparedStatement preparedStatement=null;
            String sql="select * from excelTest";
            ResultSet resultSet=null;
            excelTest exce=null;
          try {
              wwb = Workbook.createWorkbook(new File(filePath));
          } catch (Exception e) {
              e.printStackTrace();
          }
           
          //创建Excel表的"学生"区域的数据
          WritableSheet sheet = wwb.createSheet("学生",0);//或者rwb.getSheet(0)获取第一个区域
          try {
              //2. 连接数据库的几行代码
              preparedStatement=connection.prepareStatement(sql);
                
                resultSet=preparedStatement.executeQuery();
              
              while(resultSet.next())
            {
                  exce=new excelTest();
                  exce.setId(resultSet.getInt("id"));
                  exce.setName(resultSet.getString("name"));
                exce.setNum(resultSet.getString("num"));
                excelTests.add(exce);
                
            }　　
               sheet.addCell(new Label(0,0,"编号"));
               sheet.addCell(new Label(1,0,"姓名"));
               sheet.addCell(new Label(2,0,"学号"));
              for(int i = 0; i<excelTests.size(); i++){
                  //Number对应数据库的int类型数据
                  sheet.addCell(new jxl.write.Number(0,i+1,excelTests.get(i).getId()));
                  //Label对应数据库String类型数据
                  sheet.addCell(new Label(1,i+1,excelTests.get(i).getName()));
                  sheet.addCell(new Label(2,i+1,excelTests.get(i).getNum()));
                  
              }
              wwb.write();
               
          } catch (SQLException e) {
              e.printStackTrace();
          }finally{
              wwb.close();
          }
           
           
      }

}

数据库截图

导出的excel表格截图