Question

java操作poi的excel表格的线条怎么变为黑色？

Answer 1

你跑下下面的代码试下吧：
public TestExcel(){
createExcelFile();
}

private void createExcelFile() {
HSSFWorkbook hwb = new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet("test sheet");
//创建一个样式
HSSFCellStyle style = hwb.createCellStyle();
//设置边框样式
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
//设置边框颜色
style.setTopBorderColor(HSSFColor.BLACK.index);
style.setBottomBorderColor(HSSFColor.BLACK.index);
style.setLeftBorderColor(HSSFColor.BLACK.index);
style.setRightBorderColor(HSSFColor.BLACK.index);

for(int j=0;j<5;j++){
HSSFRow row = sheet.createRow(j);
for(int i=0;i<10;i++){
HSSFCell cell = row.createCell(i);
cell.setCellStyle(style);
cell.setCellValue(j+"*"+i);
}
}
File file = new File("./test.xls");
try {
FileOutputStream fos = new FileOutputStream(file);
hwb.write(fos);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

Answer 2

可以试试free spire.xls.jar, 设置网格线样式和颜色：网页链接