java大数据导出

excel2003（xls）只支持65536条数据，poi3.9提供了海量数据导出，支持07和10版（xlsx）

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 org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

/**
 * @Description: poi实现输出信息到excel文件
 * @author dongye
 * @date 2016年8月17日 下午3:09:13
 */
public class TestMore100 {
	public static void main(String[] args) throws Exception {
		TestMore100 tm = new TestMore100();
		tm.jdbcex(true);
	}

	public void jdbcex(boolean isClose) throws InstantiationException,
			IllegalAccessException, ClassNotFoundException, SQLException,
			IOException, InterruptedException {
		String xlsFile = "d:/test100.xlsx"; // 输出文件
		Workbook wb = new SXSSFWorkbook(100); // 创建excel文件，内存只有100条记录【关键语句】
		Sheet sheet = wb.createSheet("我的第一个工作簿"); // 建立新的sheet对象

		Row nRow = null;
		Cell nCell = null;

		// 使用jdbc链接数据库
		Class.forName("com.mysql.jdbc.Driver").newInstance();

		String url = "jdbc:mysql://172.20.10.32:3306/sys?characterEncoding=UTF-8";
		String user = "root";
		String password = "root";

		Connection conn = DriverManager.getConnection(url, user, password);
		Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
				ResultSet.CONCUR_UPDATABLE);

		String sql = "select name,age,des from customer limit 1000000"; // 100万测试数据
		ResultSet rs = stmt.executeQuery(sql);

		long startTime = System.currentTimeMillis(); // 开始时间
		System.out.println("strat execute time: " + startTime);
		// context
		int rowNo = 0;
		int colNo = 0;
		while (rs.next()) {
			colNo = 0;
			nRow = sheet.createRow(rowNo++);

			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(rs.getString(colNo));

			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(rs.getString(colNo));

			if (rowNo % 100 == 0) {
				System.out.println("row no: " + rowNo);
			}

			Thread.sleep(1); // 休息一下，防止对CPU占用
		}

		long finishedTime = System.currentTimeMillis(); // 处理完成时间
		System.out.println("finished execute  time: "
				+ (finishedTime - startTime) / 1000 + "m");

		FileOutputStream fOut = new FileOutputStream(xlsFile);
		wb.write(fOut);
		fOut.flush();
		fOut.close();

		long stopTime = System.currentTimeMillis(); // 写文件时间
		System.out.println("write xlsx file time: " + (stopTime - startTime)
				/ 1000 + "m");

		if (isClose) {
			this.close(rs, stmt, conn);
		}
	}

	// close resource
	private void close(ResultSet rs, Statement stmt, Connection conn)
			throws SQLException {
		rs.close();
		stmt.close();
		conn.close();
	}