Admin: 1 версия

2010-06-01T06:03:26Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:43Z

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== Convert lines into the canonical format, that is, terminate lines with the CRLF sequence. ==



<source lang="java">

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Convert lines into the canonical format, that is, terminate lines with the
* CRLF sequence.
*
* @author John Mani
*/
public class CRLFOutputStream extends FilterOutputStream {
protected int lastb = -1;
protected boolean atBOL = true; // at beginning of line?
private static final byte[] newline = { (byte) "\r", (byte) "\n" };
public CRLFOutputStream(OutputStream os) {
super(os);
}
public void write(int b) throws IOException {
if (b == "\r") {
writeln();
} else if (b == "\n") {
if (lastb != "\r")
writeln();
} else {
out.write(b);
atBOL = false;
}
lastb = b;
}
public void write(byte b[]) throws IOException {
write(b, 0, b.length);
}
public void write(byte b[], int off, int len) throws IOException {
int start = off;
len += off;
for (int i = start; i < len; i++) {
if (b[i] == "\r") {
out.write(b, start, i - start);
writeln();
start = i + 1;
} else if (b[i] == "\n") {
if (lastb != "\r") {
out.write(b, start, i - start);
writeln();
}
start = i + 1;
}
lastb = b[i];
}
if ((len - start) > 0) {
out.write(b, start, len - start);
atBOL = false;
}
}
/*
* Just write out a new line, something similar to out.println()
*/
public void writeln() throws IOException {
out.write(newline);
atBOL = true;
}
}

</source>



== Create LineNumberReader from FileReader ==



<source lang="java">

import java.io.FileReader;
import java.io.LineNumberReader;
class LineViewer {
public static void main(String[] args) throws Exception {
LineNumberReader lnr = null;
FileReader fr = new FileReader(args[0]);
lnr = new LineNumberReader(fr);
String s;
while ((s = lnr.readLine()) != null)
System.out.println(lnr.getLineNumber() + ": " + s);
}
}

</source>



== Line Number IO ==



<source lang="java">

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
public class LineNumberIOApp {
public static void main(String args[]) throws IOException {
FileReader inFile = new FileReader("LineNumberIOApp.java");
LineNumberReader inLines = new LineNumberReader(inFile);
String inputLine;
while ((inputLine = inLines.readLine()) != null) {
System.out.println(inLines.getLineNumber() + ". " + inputLine);
}
}
}

</source>



== Split Lines ==



<source lang="java">

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
/*
* soapUI, copyright (C) 2004-2009 eviware.ru
*
* soapUI is free software; you can redistribute it and/or modify it under the
* terms of version 2.1 of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* soapUI is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details at gnu.org.
*/

public class Utils {
public static final String NEWLINE = System.getProperty( "line.separator" );

public static boolean isNullOrEmpty( String str )
{
return str == null || str.length() == 0 || str.trim().length() == 0;
}

public static List<String> splitLines( String string )
{
try
{
ArrayList<String> list = new ArrayList<String>();
LineNumberReader reader = new LineNumberReader( new StringReader( string ) );
String s;
while( ( s = reader.readLine() ) != null )
{
list.add( s );
}
return list;
}
catch( IOException e )
{
// I don"t think this can really happen with a StringReader.
throw new RuntimeException( e );
}
}
}

</source>



== Use LineNumberReader class to read file ==



<source lang="java">

import java.io.File;
import java.io.FileReader;
import java.io.LineNumberReader;
public class Main {
public static void main(String[] args) throws Exception {
File file = new File("data.csv");
FileReader fr = new FileReader(file);
LineNumberReader lnr = new LineNumberReader(fr);
// lnr.setLineNumber(400);
String line = "";
while ((line = lnr.readLine()) != null) {
System.out.println("Line Number " + lnr.getLineNumber() + ": " + line);
}
fr.close();
lnr.close();
}
}

</source>



== Using the LineNumberReader to read a text file line by line ==



<source lang="java">

import java.io.FileReader;
import java.io.LineNumberReader;
public class Main {
public static void main(String[] args) throws Exception {
LineNumberReader r = new LineNumberReader(new FileReader("yourFile.txt"));
String line = null;
while ((line = r.readLine()) != null) {
System.out.println(r.getLineNumber() + ": " + line);
}
r.close();
}
}

</source>

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Java/File Input Output/LineNumberReader - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010