[英]how to create appendable excelsheet using java
I want to create an append-able excel sheet. 我想创建一个可附加的excel表。 Like i have four columns stream1 stream2 stream3 stream4
就像我有四列stream1 stream2 stream3 stream4
first time i am inserting data only first column(stream1) after that i want to full fill other columns one by one. 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。
this is the code which i am using: 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();
But this is not append-able code. 但这不是可追加的代码。 its inserting data row by row.
它逐行插入数据。
thx in advanced. thx in advanced。
I suppose a slight change in your code should do it. 我想你的代码应该稍微改变一下。
Try replacing 尝试更换
int i = 1;
int i = 1;
with the following: 以下内容:
int i = sheet1.getLastRowNum() + 1;
int i = sheet1.getLastRowNum()+ 1;
You would also need to change your implementation for reading and writing files a bit. 您还需要更改读取和写入文件的实现。
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