public static void makeRowBold(Workbook wb,Row row){
    CellStyle style = wb.createCellStyle();//Create style
    Font font = wb.createFont();//Create font
    font.setBold(true);//Make font bold
    style.setFont(font);//set it to bold
 
    for(int i = 0; i < row.getLastCellNum(); i++){//For each cell in the row 
        row.getCell(i).setCellStyle(style);//Set the style
    }
}

它基本上遍历传入的行中的每个单元格,将样式设置为粗体.应该导致整行被设置为所需的样式.

祝好运！

编辑

一个更完整的例子：

public static void main(String[] args) {
    Path myFile = Paths.get(System.getProperty("user.home"),"Desktop","tester.xlsx");
 
        try {
            XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(myFile.toFile()));
            XSSFSheet sheet = wb.getSheetAt(0);
            makeRowBold(wb,sheet.getRow(0));
 
            wb.write(new FileOutputStream(myFile.toFile()));
        } catch (IOException e) {
            e.printStackTrace();
        }
}
 
 
public static void makeRowBold(Workbook wb,Row row){
    CellStyle style = wb.createCellStyle();//Create style
    Font font = wb.createFont();//Create font
    font.setBold(true);//Make font bold
    style.setFont(font);//set it to bold
 
    for(int i = 0; i < row.getLastCellNum(); i++){//For each cell in the row 
        row.getCell(i).setCellStyle(style);//Set the sty;e
    }
}

这是在xlsx文件上测试的,数据在第1行,结果文件后面有粗体数据.