Question

I have an excel file with extension xls. I want to give a background color of all the rows based on the first column value of each row . My code is not working based on my requirement .Back ground color is happening but not as per the requirement . I am using apache POI jar for implementation .

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;

public class DemoPainter {

public void colorSheet() throws IOException {

    FileInputStream fi = new FileInputStream(
            "/vobs/SampleFile.xls");
    POIFSFileSystem fs = new POIFSFileSystem(fi);
    HSSFWorkbook wb = new HSSFWorkbook(fs);
    HSSFSheet sheet = wb.getSheetAt(0);
    System.out.println("Sheet Name: " + sheet.getSheetName());
    startColor(sheet, wb);
}

public void startColor(HSSFSheet sheet, HSSFWorkbook wb) throws IOException {

    for (int rowIndex = 0; rowIndex < sheet.getPhysicalNumberOfRows(); rowIndex++){
        Row row=sheet.getRow(rowIndex);
        Cell cell=row.getCell(0);
        System.out.println(cell.getStringCellValue());
        if(cell.getStringCellValue().equals("modified")){
            setYellowColor(wb,row);
        }
        else if(cell.getStringCellValue().equals("removed")){
            setRedColor();
        }
        else {
            setGreenColor();
        }
    }
    FileOutputStream out = new FileOutputStream(new File("/vobs/SampleFile1.xls"));
    wb.write(out);
    out.close();
}

public void setYellowColor(HSSFWorkbook wb,Row row){
    CellStyle style = wb.createCellStyle();
    System.out.println("started Yellow color");
    style.setFillForegroundColor(HSSFColor.YELLOW.index);
    style.setFillPattern(CellStyle.SOLID_FOREGROUND);
    row.setRowStyle(style);
}

public void setRedColor(){

}

public void setGreenColor(){

}

}

Required Output excel sheet image中获取div中第一个孩子的值， Current Output excel sheet image based on my code behavior

有人可以帮忙吗？

Answer 1

宣传对答案的评论....

你有两个问题。问题＃1 - 单元格样式是工作簿范围，所以不要为每一行创建一个！预先创建它们，否则您将超出工作簿中Excel允许的最大样式数。

问题＃2 - 您没有在行中设置单个已完成单元格的样式。行样式是默认值，适用于Excel中添加的新单元格。它们不适用于已存在的单元格，因为在创建单元格时，它始终具有对应用样式的引用。因此，您还需要在行中的现有单元格上设置单元格样式

奖金问题＃3 - 您已在所有地方HSSF编码，因此您的代码仅适用于XLS个文件。有关如何将代码更改为常规代码以及XLSX的工作原理

，请参阅http://poi.apache.org/spreadsheet/converting.html

将您的代码更改为......

File input = new File("/vobs/SampleFile.xls");
DataFormatter formatter = new DataFormatter();
Workbook wb = WorkbookFactory.create(input);
Sheet sheet = wb.getSheetAt(0);
System.out.println("Sheet Name: " + sheet.getSheetName());

CellStyle yellow = wb.createCellStyle();
yellow.setFillForegroundColor(Color.YELLOW.index);
yellow.setFillPattern(CellStyle.SOLID_FOREGROUND);

// And Red etc

for (Row r : sheet) {
   Cell c1 = r.getCell(0);
   if (c1 == null) {
      // Empty row
      continue;
   }
   // Get cell as string
   String val = formatter.formatCellValue(c1);

   // Check
   if(val.equals("modified")) {
      r.setRowStyle(yellow);
      for (Cell c : r) {
         c.setCellStyle(yellow);
      }
    }
    else if(val.equals("removed")){
       // etc
    }
}

FileOutputStream out = new FileOutputStream(new File("/vobs/Changed.xls"));
wb.write(out);
out.close();

Not able to provide background color for a row in excel sheet

1 个答案: