我正在使用以下程序将xlsx转换为csv,如果每个单元格字符串包含换行符(/ n)或分隔符,我想添加引号字符(“”)。
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class XlsxtoCSV {
static void xlsx(File inputFile, File outputFile) {
// For storing data into CSV files
StringBuffer data = new StringBuffer();
try {
FileOutputStream fos = new FileOutputStream(outputFile);
// Get the workbook object for XLSX file
XSSFWorkbook wBook = new XSSFWorkbook(new FileInputStream(inputFile));
// Get first sheet from the workbook
XSSFSheet sheet = wBook.getSheetAt(0);
Row row;
Cell cell;
// Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
row = rowIterator.next();
// For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
cell = cellIterator.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
data.append(cell.getBooleanCellValue() + ",");
break;
case Cell.CELL_TYPE_NUMERIC:
data.append(cell.getNumericCellValue() + ",");
break;
case Cell.CELL_TYPE_STRING:
data.append(cell.getStringCellValue() + ",");
break;
case Cell.CELL_TYPE_BLANK:
data.append("" + ",");
break;
default:
data.append(cell + ",");
}
}
}
fos.write(data.toString().getBytes());
fos.close();
} catch (Exception ioe) {
ioe.printStackTrace();
}
}
//testing the application
public static void main(String[] args) {
//reading file from desktop
File inputFile = new File("C:\\Users\\user69\\Desktop\\test.xlsx");
//writing excel data to csv
File outputFile = new File("C:\\Users\\user69\\Desktop\\test1.csv");
xlsx(inputFile, outputFile);
}
}
根据RFC4180 Csv规则。包含换行符(CRLF),双引号和逗号的字段应括在双引号中。因此,如果单元格数据在添加到String缓冲区之前包含换行符或分隔符(,),则必须格式化单元格数据(数字或字符串或任何其他类型)。请帮助我根据CSV规则格式化单元格数据。
答案 0 :(得分:1)
使用像commons-csv这样的库:
final Appendable out = ...;
final CSVPrinter printer = CSVFormat.DEFAULT.withHeader("H1", "H2").print(out);
...
while (rowIterator.hasNext()) {
...
while (cellIterator.hasNext()) {
...
printer.print(cell.getStringCellValue());
...
}
printer.println();
}
另见简短user-guide
答案 1 :(得分:0)
Centic的答复完全正确。只是为了扩展他的内容,这是我完整且经过测试的方法,该方法使用 Common CSV 进行实际值打印。不幸的是,我们仍然需要遍历Sheet,XSSF中没有自动CSV输出方法,但是我遵循Centic的策略进行行/单元迭代。
此示例输出到OutputStream
,但是显然File
同样容易(在FileReader
构造函数中使用CSVPrinter
)。
// Convert an XSSFWorkbook to CSV and write to provided OutputStream
private void writeWorkbookAsCSVToOutputStream(XSSFWorkbook workbook, OutputStream out) {
CSVPrinter csvPrinter = null;
try {
// Or change this to File-based constructor, if File output is required
csvPrinter = new CSVPrinter(new OutputStreamWriter(out), CSVFormat.DEFAULT);
if (workbook != null) {
XSSFSheet sheet = workbook.getSheetAt(0); // Sheet #0
Iterator<Row> rowIterator = sheet.rowIterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
csvPrinter.print(cell.getStringCellValue()); // Commons CSV prints here
}
// Newline after each row
csvPrinter.println();
}
}
}
catch (Exception e) {
log.error("Failed to write CSV file to output stream", e);
}
finally {
try {
if (csvPrinter != null) {
// Close CSVPrinter
csvPrinter.flush();
csvPrinter.close();
}
}
catch (IOException ioe) {
log.error("Error when closing CSV Printer", ioe);
}
}
}