java 在原有的excel模板上追加新数据

引用

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class Test {
    private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    private static File hasFile;

    /**
     * 同步操作，防止并发。
     *
     * @param args
     * @return
     * @throws IOException
     * @throws RowsExceededException
     * @throws WriteException
     */
    public synchronized static String[] write(String[] args)
            throws IOException, RowsExceededException, WriteException {

        // 文件路径 
        // 判断文件是否存在，如果存在就不创建，追加，如果不存在则创建文件并追加。 
        WritableWorkbook book = Workbook.createWorkbook(getHasFile());
        book.setProtected(true);
        // -- 第一个参数是Sheet名，第二个参数是Sheet下标 
        // -- 下标是整数，只起标识作用，建立的时候会以create顺序建立，本例生成的EXCEL文件第一个Sheet是sheet1 
        WritableSheet sheet = book.createSheet("第一页", 1);
        sheet.setColumnView(0, 20);
        sheet.setColumnView(1, 20);
        sheet.setColumnView(2, 5);
        sheet.setColumnView(3, 20);
        sheet.setColumnView(4, 20);
        sheet.setColumnView(5, 20);
        sheet.setColumnView(6, 20);
        sheet.setColumnView(7, 20);
        sheet.setColumnView(8, 20);
        sheet.getSettings().setProtected(true);
        sheet.getSettings().setPassword("xxxx");//设置密码 
        String[] title = { "支付宝交易号", "订单号", "交易总金额", "商品名称/订单名称", "商品描述/订单备注",
                "买家支付宝账号", "交易状态", "sign", "交易时间" };
        for (int i = 0; i < title.length; i++) {
            Label lable = new Label(i, 0, title[i]);
            sheet.addCell(lable);
        }
        // 初次创建，写入一行。 
        for (int i = 0; i < title.length; i++) {
            Label lable = new Label(i, 1, args[i]);
            sheet.addCell(lable);
        }
        // 每次写入数据时，写到最后一行。 
        book.write();
        book.close();
        System.out.println("写入成功");
        return null;
    }

    /**
     * 追加excel
     *
     * @param args
     * @throws IOException
     * @throws BiffException
     * @throws WriteException
     * @throws RowsExceededException
     */
    public static void addExcel(File file, String[] args) throws BiffException,
            IOException, RowsExceededException, WriteException {
        Workbook book = Workbook.getWorkbook(file);
        Sheet sheet = book.getSheet(0);
        // 获取行 
        int length = sheet.getRows();
        System.out.println(length);
        WritableWorkbook wbook = Workbook.createWorkbook(file, book); // 根据book创建一个操作对象 
        WritableSheet sh = wbook.getSheet(0);// 得到一个工作对象 
        // 从最后一行开始加 
        for (int i = 0; i < args.length; i++) {
            Label label = new Label(i, length, args[i]);
            sh.addCell(label);
        }
        wbook.write();
        wbook.close();
    }

    /**
     * 判断文件是否已经写入
     *
     * @param filename
     * @return
     */
    public static boolean filecheck(String filename) {
        boolean flag = false;
        File file = new File(filename);
        if (file.exists()) {
            flag = true;
        }
        setHasFile(file);
        return flag;
    }

    /**
     * 不管神马类型，都转换成string
     *
     * @param obj
     * @return
     */
    public static String converToString(Object obj) {
        return "";
    }

    public static void main(String[] args) throws RowsExceededException,
            WriteException, IOException, BiffException {
        String filepath = Test.class.getResource("/").getPath()
                + sdf.format(new Date()) + ".xls";
        String[] str = { "20101020102032032", "2012203203232032032", "50",
                "100元朗识币", "这个订单没有备注", "[e-mail]", "STATU_SUCCESS",
                "hahah", sdf.format(new Date()) };
        boolean has = Test.filecheck(filepath);
        // 如果存在 
        if (has)
            addExcel(getHasFile(), str);
        else {
            write(str);
        }

    }

    /**
     * @return the hasFile
     */
    public static File getHasFile() {
        return hasFile;
    }

    /**
     * @param hasFile
     *            the hasFile to set
     */
    public static void setHasFile(File hasFile) {
        Test.hasFile = hasFile;
    }

}