一、直接導出

package com.ij34.util;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

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;

/** 
* @author Admin
* @date 創建時間：2017年8月30日 上午11:49:42 
* @version 1.0
*@type_name Test03
*/
public class Test03 {

    public static void main(String[] args) throws FileNotFoundException, IOException {
        // TODO Auto-generated method stub

        HSSFWorkbook wb= new HSSFWorkbook();
          HSSFSheet sheet=wb.createSheet("table04");
          Object[][] datas={{"ID","Name","age"},{1,"大B",18},{2,"小A",19},{3,"小C",21}};
          HSSFRow row;
          HSSFCell cell;
          for(int i=0;i<datas.length;i++){
              row=sheet.createRow(i);
              for(int j=0;j<datas[i].length;j++){
                  cell=row.createCell(j);
                  cell.setCellValue(String.valueOf(datas[i][j]));
              }
          }
          wb.write(new FileOutputStream("table04.xls"));
          System.out.println("導出xls成功!");
    }
    }

 二、導出資料庫的數據

package com.ij34.util;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.NamingException;
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;

/** 
* @author Admin
* @date 創建時間：2017年8月29日 上午11:35:28 
* @version 1.0
*@type_name Test01
*從資料庫里導出Excel文件
*/
public class Test01 {
  public static void main(String[] args) throws FileNotFoundException, IOException, SQLException, NamingException, ClassNotFoundException {

        Class.forName("oracle.jdbc.OracleDriver"); 
      Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "lyx", "123456");
      String sqlStr ="select * from student";
      Statement stmt=conn.createStatement();
      ResultSet rs=stmt.executeQuery(sqlStr);
      HSSFWorkbook wb= new HSSFWorkbook();
      HSSFSheet sheet=wb.createSheet("table03");
      HSSFRow row;
      int i=0;
      HSSFCell cell;
      while(rs.next()){
              row=sheet.createRow(i);
              cell=row.createCell(0);  //Excel里第一（A）列
              cell.setCellValue(String.valueOf(rs.getInt(1))); 
              cell=row.createCell(1);
              cell.setCellValue(String.valueOf(rs.getString(2)));
              cell=row.createCell(2);
              cell.setCellValue(String.valueOf(rs.getInt(3)));
              cell=row.createCell(3);
              cell.setCellValue(String.valueOf(rs.getInt(4)));
              cell=row.createCell(4);
              cell.setCellValue(String.valueOf(rs.getString(5)));
              i++;
}
      wb.write(new FileOutputStream("table03.xls"));
      System.out.println("導出xls成功!");
      rs.close();
      stmt.close();
      conn.close();
}
}

 添加列名

package com.ij34.util;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.NamingException;
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;

/** 
* @author Admin
* @date 創建時間：2017年8月29日 上午11:35:28 
* @version 1.0
*@type_name Test01
*從資料庫里導出Excel文件
*/
public class Test01 {
  public static void main(String[] args) throws FileNotFoundException, IOException, SQLException, NamingException, ClassNotFoundException {

        Class.forName("oracle.jdbc.OracleDriver"); 
      Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "lyx", "123456");
      String sqlStr ="select * from student";
      Statement stmt=conn.createStatement();
      ResultSet rs=stmt.executeQuery(sqlStr);
      HSSFWorkbook wb= new HSSFWorkbook();
      HSSFSheet sheet=wb.createSheet("table03");
      HSSFRow row;
      int i=0; 
      HSSFCell cell;
      //列名標柱
      row=sheet.createRow(i);
      cell=row.createCell(0);
      cell.setCellValue("序號");
      cell=row.createCell(1);
      cell.setCellValue("名字");
      cell=row.createCell(2);
      cell.setCellValue("性別0|1");
      cell=row.createCell(3);
      cell.setCellValue("年齡");
      cell=row.createCell(4);
      cell.setCellValue("地址");
      while(rs.next()){
              i++;
              row=sheet.createRow(i);
              cell=row.createCell(0);
              cell.setCellValue(String.valueOf(rs.getInt(1)));
              cell=row.createCell(1);
              cell.setCellValue(String.valueOf(rs.getString(2)));
              cell=row.createCell(2);
              cell.setCellValue(String.valueOf(rs.getInt(3)));
              cell=row.createCell(3);
              cell.setCellValue(String.valueOf(rs.getInt(4)));
              cell=row.createCell(4);
              cell.setCellValue(String.valueOf(rs.getString(5)));
}
      wb.write(new FileOutputStream("table03.xls"));
      System.out.println("導出xls成功!");
      rs.close();
      stmt.close();
      conn.close();
}
}

 附jar包