百万记录poi导出日记

机器环境：
hp probook 4326s 4G AMD P340 2.20Hz
mysql 5.0.26
sts spring eclipse
jdk 1.7.09
tomcat 7.0

步骤：
JDBC访问
使用POI中的 XFFX 对象

导入jar包：
核心包：
poi-3.9-20121203.jar
poi-ooxml-3.9-20121203.jar
poi-ooxml-schemas-3.9-20121203.jar
依赖包：
commons-beanutils-1.7.0.jar
commons-collections-3.0.jar
commons-lang-2.0.jar
commons-logging-1.0.4.jar
dom4j-1.6.1.jar
standard-1.0.2.jar
stax-api-1.0.1.jar
xmlbeans-2.3.0.jar
mysql-connector-java-5.1.10-bin.jar
junit-4.8.2.jar
测试程序，从测试表中读取100万数据，轻松写入excel中。

 

package test;

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.CellStyle;
import org.apache.poi.ss.usermodel.Font;
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;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 * @Description:  poi实现输出信息到excel文件
 * @Author: nutony
 * @Date: 2013-05-15
 */
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://localhost:3306/jkmore100?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(); 
        }        
        
}