如何使用Java将数据写入Excel工作表。（How to write data into excel sheet using Java.）

问题描述 (Problem Description)

如何使用Java将数据写入Excel工作表。

解决方案 (Solution)

以下是使用Java将数据写入Excel工作表的程序。

import java.io.File;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class WriteDataToExcel {
   public static void main(String[] args) throws Exception {
      //Create blank workbook
      XSSFWorkbook workbook = new XSSFWorkbook();
      //Create a blank sheet
      XSSFSheet spreadsheet = workbook.createSheet( " Employee Info ");
      //Create row object
      XSSFRow row;
      //This data needs to be written (Object[])
      Map < String, Object[] > empinfo = new TreeMap < String, Object[] >();
      empinfo.put( "1", new Object[] {
         "EMP ID", "EMP NAME", "DESIGNATION" });
      empinfo.put( "2", new Object[] {
         "tp01", "Gopal", "Technical Manager" });
      empinfo.put( "3", new Object[] {
         "tp02", "Manisha", "Proof Reader" });
      empinfo.put( "4", new Object[] {
         "tp03", "Masthan", "Technical Writer" });
      empinfo.put( "5", new Object[] {
         "tp04", "Satish", "Technical Writer" });
      empinfo.put( "6", new Object[] {
         "tp05", "Krishna", "Technical Writer" });
      //Iterate over data and write to sheet
      Set < String > keyid = empinfo.keySet();
      int rowid = 0;
      for (String key : keyid) {
         row = spreadsheet.createRow(rowid++);
         Object [] objectArr = empinfo.get(key);
         int cellid = 0;
         for (Object obj : objectArr){
            Cell cell = row.createCell(cellid++);
            cell.setCellValue((String)obj);
         }
      }
      //Write the workbook in file system
      FileOutputStream out = new FileOutputStream(
         new File("C:/poiexcel/Writesheet.xlsx"));
      workbook.write(out);
      out.close();
      System.out.println("Writesheet.xlsx written successfully");
   }
}

结果 (Result)