如何使用java创建可附加的excelsheet

Question

我想创建一个可附加的excel表.就像我有四列stream1 stream2 stream3 stream4

第一次我只插入数据第一列(stream1)之后,我想逐个完全填充其他列.

这是我正在使用的代码:

 public void createFile(Jqueue stream1, Jqueue stream2, Jqueue stream3, Jqueue stream4) {
    try {

        String filename = "path";
        boolean alreadyExists = (new File(filename)).exists();

        HSSFRow rowhead = sheet1.createRow((short) 0);
        rowhead.createCell((short) 0).setCellValue("Stream 1");
        rowhead.createCell((short) 1).setCellValue("Stream 2");
        rowhead.createCell((short) 2).setCellValue("Stream 3");
        rowhead.createCell((short) 3).setCellValue("Stream 4");


        int i = 1;
        while (!stream1.isEmpty()) {
            String urlstream1 = "";
            String urlstream2 = "";
            String urlstream3 = "";
            String urlstream4 = "";
            HSSFRow row = sheet1.createRow((short) i);
            try {
                if (stream1.size() > 0) {
                    urlstream1 = stream1.dequeue().toString();
                }
            } catch (Exception ex) {
            }
            try {
                if (stream2.size() > 0) {
                    urlstream2 = stream2.dequeue().toString();
                }
            } catch (Exception ex) {
            }
            try {
                if (stream3.size() > 0) {
                    urlstream3 = stream3.dequeue().toString();
                }
            } catch (Exception ex) {
            }
            try {
                if (stream4.size() > 0) {
                    urlstream4 = stream4.dequeue().toString();
                }
            } catch (Exception ex) {
            }
            row.createCell((short) 0).setCellValue(urlstream1);
            row.createCell((short) 1).setCellValue(urlstream2);
            row.createCell((short) 2).setCellValue(urlstream3);
            row.createCell((short) 3).setCellValue(urlstream4);
            i++;
        }

        FileOutputStream fileOut = new FileOutputStream(filename);
        hwb.write(fileOut);
        fileOut.close();

但这不是可追加的代码.它逐行插入数据.

thx in advanced.

Answer 1

我想你的代码稍微改变一下就可以了。

尝试更换

整数 i = 1;

具有以下内容：

int i =sheet1.getLastRowNum() + 1;

您还需要稍微更改一下读取和写入文件的实现。