将数据库中表格的数据导出到Excel表中亲测有效

好东西分享给大家，
需要引入的maven依赖

<dependencies>
        <!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
        <!--文件上传组件-->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>
        <!--读取excel文件-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>
    </dependencies>

package com.fuyuan.ssm;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;


import java.io.FileOutputStream;
import java.sql.*;

/**
 * @author supperman
 * @version 1.0
 */
public class TestPicture {
    
    

    /**
     * 将数据库dname中的表名为tname的数据表写入Excel表格
     * @param dname
     * @param tname
     */
    public static String writeDbtoExcel(String dname,String tname){
    
    


        String path="E:/axls/"+tname+".xls";

        HSSFWorkbook book=new HSSFWorkbook();
        HSSFSheet sheet=book.createSheet("表");
        try {
    
    
            Class.forName("com.mysql.cj.jdbc.Driver");
            Connection con;
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/"+dname+"?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai","root","123456");
            Statement st=con.createStatement();
            String sql="select * from "+tname;
            ResultSet rs=st.executeQuery(sql);
            //得到结果集的字段名
            ResultSetMetaData rsmd=rs.getMetaData();
            //得到数据表的结果集的字段的数量
            int c=rsmd.getColumnCount();
            //生成表单的第一行，即表头
            HSSFRow row0=sheet.createRow(0);//创建第一行
            for(int i=0;i<c;i++){
    
    
                HSSFCell cel=row0.createCell(i);//创建第一行的第i列
                cel.setCellValue(rsmd.getColumnName(i+1));
//				cel.setCellStyle(style);
            }
            //将数据表中的数据按行导入进Excel表中
            int r=1;
            while(rs.next()){
    
    
                HSSFRow row=sheet.createRow(r++);//创建非第一行的其他行
                for(int i=0;i<c;i++){
    
    //仍然是c列，导入第r行的第i列
                    HSSFCell cel=row.createCell(i);
                    //以下两种写法均可
//					cel.setCellValue(rs.getString(rsmd.getColumnName(i+1)));
                    cel.setCellValue(rs.getString(i+1));
                }
            }
            //用文件输出流类创建名为table的Excel表格
            FileOutputStream out=new FileOutputStream(path);
            book.write(out);//将HSSFWorkBook中的表写入输出流中
            book.close();
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
        return path;
    }

    public static void main(String[] args) {
    
    
        TestPicture.writeDbtoExcel("testdatabase","tb_supplier");
    }
}