![](/img/trans.png)
[英]Inserting data from arraylist in chunks in excel file using apache poi
[英]Writing to an Excel file using Apache POI a huge data from ArrayList of Strings
我有一个非常大的字符串数组列表(大约超过500k和更多项)。 是否有可能加快将此数组写入Excel文件的速度? 现在需要一段时间,我不知道我是否做了我能做的一切(也许.get方法有问题吗?)。 请参考以下代码(请不要注意细节-此类仅出于测试目的而创建):
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
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.usermodel.XSSFWorkbook;
public class Tests {
private static final String ADDRESS = "./result/file.xlsx";
public static void readAndWriteAData(int counterOfExecutions, List<String> listOfResults) throws IOException{
File file = new File(ADDRESS);
if(file.exists()&&!file.isDirectory()){
file.delete();
}
@SuppressWarnings("resource")
Workbook wb = new XSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream(ADDRESS);
wb.write(fileOut);
fileOut.close();
Sheet sheet = wb.createSheet("1");
Row row;
Cell cell;
int add = 0;
System.out.println("Start of filling excel file");
for(int i=0; i<counterOfExecutions;i++){
row = sheet.createRow(i);
for(int j=0; j<5; j++){
cell = row.createCell(j);
cell.setCellValue(listOfResults.get(j+add));
}
add+=5;
}
FileOutputStream fileOutputSecond = new FileOutputStream(file);
wb.write(fileOutputSecond);
fileOutputSecond.close();
System.out.println("File "+ADDRESS+" has been created.");
}
public static void main(String[] args) throws IOException {
System.out.println("Start of creating ArrayList");
List<String> lista = new ArrayList<>();
for(int i = 1 ; i<550000;i++){
lista.add("nic "+i);
}
System.out.println("ArrayList has been filled");
readAndWriteAData(100999, lista);
System.out.println("The End");
}
}
非常感谢您的任何提示! :)
请尝试使用SXSSFWorkbook。 为了更好地使用它,它将更加高效。尝试查看Apache POI 3.8 API
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.