Helper class to write table data to a csv-file (comma separated values).
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import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
/**
* helper class to write table data to a csv-file (comma separated values).
* the first line in file is a list of fieldnames, all following lines
* are data lines.
* a descptiontion of file format can be found on: http://www.wotsit.org/
* usage: create a object using the constructor. call writeHeader
* for writing the filename header then add data with writeData.
* at the end close() closes the file.
*
*@author jeberle@users
*/
public class CSVWriter {
private String newline = System.getProperty("line.separator");
private OutputStreamWriter writer = null;
private int nbrCols = 0;
private int nbrRows = 0;
/**
* constructor.
* creates a csv file for writing data to it
* @param file the file to write data to
* @param encoding encoding to use or null (=defualt)
*/
public CSVWriter(File file, String encoding) throws IOException {
if (encoding == null) {
encoding = System.getProperty("file.encoding");
}
FileOutputStream fout = new FileOutputStream(file);
writer = new OutputStreamWriter(fout, encoding);
}
/**
* writes the csv header (fieldnames). should be called after
* construction one time.
* @param header String[] with fieldnames
*/
public void writeHeader(String[] header) throws IOException {
this.nbrCols = header.length;
doWriteData(header);
}
/**
* writes a data-record to the file. note that data[] must have
* same number of elements as the header had.
*
* @param data data to write to csv-file
*/
public void writeData(String[] data) throws IOException {
doWriteData(data);
}
/**
* closes the csv file.
*/
public void close() throws IOException {
this.writer.close();
}
private void doWriteData(String[] values) throws IOException {
for (int i = 0; i < values.length; i++) {
if (i > 0) {
this.writer.write(";");
}
if (values[i] != null) {
this.writer.write("\"");
this.writer.write(this.toCsvValue(values[i]));
this.writer.write("\"");
}
}
this.writer.write(newline);
this.nbrRows++;
}
private String toCsvValue(String str) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
sb.append(c);
switch (c) {
case '"' :
sb.append('"');
break;
}
}
return sb.toString();
}
}
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