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CSV parser. It maybe work for CSV file that is exported from Excel. but it doesn’t support multiline cell.

hpackage jp.underthetree.csvparser;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CsvFile {

private List rows = new ArrayList();

// read from stream
public static CsvFile createFromStream(InputStream st) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(st));
CsvFile file = new CsvFile();
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
file.getRows().add(new CsvRow(line));
}

return file;
}

// list implementation of CsvRow
public List getRows() {
return rows;
}

// output to stream
public void writeToStream(OutputStream st) throws IOException {
BufferedWriter wri = new BufferedWriter(new OutputStreamWriter(st));

for (Iterator it = getRows().iterator(); it.hasNext();) {
wri.write(((CsvRow)it.next()).toCsvString());
}
}

public String toString() {
return rows.toString();
}

public static class CsvRow {

private List cells = new ArrayList();

public CsvRow() {}

// read from line
public CsvRow(String line) {
final StringBuffer buf = new StringBuffer();

boolean openQuot = false;
for (int i = 0; i < line.length(); i++) {
char c = line.charAt(i);
openQuot ^= (c == '"');

if (!openQuot && c == ',') {
this.cells.add(new CsvCell(buf.toString()));
buf.setLength(0);
} else {
buf.append(c);
}
}
}

// output comma separated line
public String toCsvString() {
StringBuffer buf = new StringBuffer();

Iterator it = getCells().iterator();
for (buf.append((String)it.next());
it.hasNext();
buf.append(",").append((String)it.next()));

return buf.toString();
}

// list implementation of CsvCell
public List getCells() {
return cells;
}

public String toString() {
return cells.toString();
}
}

public static class CsvCell {

public static final String QUOT_CHAR = """;
public static final String QUOT_ESCAPE = """";
private final String rawData;

public CsvCell(String data) {
rawData = data;
}

// cook cell's "
public static CsvCell createCsvCellFromFormat(String data) {
StringBuffer buf = new StringBuffer();
char lastChar = 0;
for (int i = 0; i < data.length(); i++) {
char c = data.charAt(i);
if ((lastChar != '"' && c != '"') ||
lastChar == '"' && c == '"') {
buf.append(c);
}
lastChar = c;
}

return new CsvCell(buf.toString());
}

// output escaped string of cell data
public String toCsvString() {
if (rawData.indexOf(QUOT_CHAR) > 0) {
return quote(rawData.replace(QUOT_CHAR, QUOT_ESCAPE));
} else if (rawData.indexOf(",") > 0) {
return quote(rawData);
}

return rawData;
}

// output contents text
protected String quote(String str) {
return QUOT_CHAR.concat(rawData).concat(QUOT_CHAR);
}

public String toString() {
return rawData;
}
}
}

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