POI自動調整列寬支持中文

/**
     * @Description:表格自適應寬度(中文支持)
     * @Author: 
     * @param sheet sheet
     * @param columnLength 列數
     */
    private static void setSizeColumn(HSSFSheet sheet, int columnLength) {
        for (int columnNum = 0; columnNum <= columnLength; columnNum++) {
            int columnWidth = sheet.getColumnWidth(columnNum) / 256;
            for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                HSSFRow currentRow; // 當前行未被使用過
                if (sheet.getRow(rowNum) == null) {
                    currentRow = sheet.createRow(rowNum);
                } else {
                    currentRow = sheet.getRow(rowNum);
                }
                if (currentRow.getCell(columnNum) != null) {
                    HSSFCell currentCell = currentRow.getCell(columnNum);
                    if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                        int length = currentCell.getStringCellValue().getBytes().length;
                        if (columnWidth < length) {
                            columnWidth = length;
                        }
                    }
                }
            }
            sheet.setColumnWidth(columnNum, columnWidth * 256);
        }
    }