Question

java操作poi的excel表格的线条怎么变为黑色

Answer 1

修改完需要写入，也就是保存一下的。
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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 ChangeCell {

@SuppressWarnings("deprecation")
public static void main(String[] args) {
String fileToBeRead = "C:\\exp.xls"; // excel位置
int coloum = 1; // 比如你要获取第1列
try {
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(
fileToBeRead));
HSSFSheet sheet = workbook.getSheet("Sheet1");

for (int i = 0; i <= sheet.getLastRowNum(); i++) {
HSSFRow row = sheet.getRow((short) i);
if (null == row) {
continue;
} else {
HSSFCell cell = row.getCell((short) coloum);
if (null == cell) {
continue;
} else {
System.out.println(cell.getNumericCellValue());
int temp = (int) cell.getNumericCellValue();
cell.setCellValue(temp + 1);
}
}
}
FileOutputStream out = null;
try {
out = new FileOutputStream(fileToBeRead);
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

}