POI自动调整列宽支持中文

 /**
      * @Description:表格自适应宽度(中文支持)
      * @Author:
      * @param sheet sheet
      * @param columnLength 列数
      */
     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; // 当前行未被使用过
                 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);
         }
     }