请问用POI生成Excel文件时,怎么能生成边框线条等?

Question

import org.apache.poi.hssf.usermodel.*;import java.io.FileOutputStream;
import java.io.IOException;/**
 * Demonstrates how to create borders around cells.
 *
 * @author Glen Stampoultzis (glens at apache.org)
 */
public class Borders
{
    public static void main(String[] args)
        throws IOException
    {
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("new sheet");        // Create a row and put some cells in it. Rows are 0 based.
        HSSFRow row = sheet.createRow((short) 1);        // Create a cell and put a value in it.
        HSSFCell cell = row.createCell((short) 1);
        cell.setCellValue(4);        // Style the cell with borders all around.
        HSSFCellStyle style = wb.createCellStyle();
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBottomBorderColor(HSSFCellStyle.BLACK);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setLeftBorderColor(HSSFCellStyle.GREEN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setRightBorderColor(HSSFCellStyle.BLUE);
        style.setBorderTop(HSSFCellStyle.BORDER_MEDIUM_DASHED);
        style.setTopBorderColor(HSSFCellStyle.AUTOMATIC);
        cell.setCellStyle(style);        // Write the output to a file
        FileOutputStream fileOut = new FileOutputStream("workbook.xls");
        wb.write(fileOut);
        fileOut.close();
    }
}