As a tripartite POI database application operating in a wide range of Excel, this article focuses on export processing large quantities of data in Excel, version 4.1.0:
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>4.1.0</version> </dependency>
HSSFWorkbook used for export, the following sample code, the code data derived 50,000 rows 20 columns, where the respective printing time, see:
package com.test.poi; 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; public class Demo { public static void main(String[] args) throws IOException { testHSSFWorkbook(); } static void testHSSFWorkbook() throws IOException { long start = System.currentTimeMillis(); HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet(); HSSFRow row = sheet.createRow(0); for (int i = 0; i < 20; i++) { HSSFCell cell = row.createCell(i); cell.setCellValue("列" + i); } System.out.println("准备完表头时间:" + (System.currentTimeMillis() - start)); for (int i = 0; i < 50000; i++) { HSSFRow rowInfo = sheet.createRow(i + 1); for (int j = 0; j < 20; j++) { HSSFCell cellInfo = rowInfo.createCell(j); cellInfo.setCellValue("列内容为" + j); } } System.out.println("准备完表内容时间:" + (System.currentTimeMillis() - start)); FileOutputStream out = new FileOutputStream("D:\\test.xlsx"); workbook.write(out); out.close(); System.out.println("Input Completion Time:" + (System.currentTimeMillis () - Start)); System.out.println ( "Finish" ); } }
The output is:
After preparing the header time: 220
to prepare a table of contents End Time: 1730
input completion time: 4471
Finish