poi处理大量数据

使用的pom.xml文件如下所示：

       <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.8</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.8-beta3</version>
        </dependency>
注意这里的poi-ooxml版本，一定是3.8-beta3版本，因为3.8正式版还没有。其中使用的写excel操作与常规的写法是一样的。

 java代码：

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hslf.model.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(new File("D://result.xlsx"));
			Workbook writeWB = new SXSSFWorkbook(500);  //读取500行后会缓到磁盘
	        org.apache.poi.ss.usermodel.Sheet writeSheet = writeWB.createSheet("1");
	        for (int i=0; i<1000000;i++) {  
	            Row writeRow = writeSheet.createRow(i);  
	            for (int j = 0; j < 10; j++) {  
	                writeRow.createCell(j).setCellValue("中国");  
	            }  
	        }  
	        writeWB.write(out);  
	        out.flush();
	        out.close();
	        System.out.println("测试成功！");
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}  
	}
}