Append data into a file using Apache Commons I/O

Question

The FileUtils.writeStringToFile(fileName, text) function of Apache Commons I/O overwrites previous text in a file. I would like to append data to my file. Is th

Answer 1

Download the latest version Commons-io 2.1

FileUtils.writeStringToFile(File,Data,append)

set append to true....

Answer 2

in version 2.5 you need to pass one extra parameter i.e, encoding.

FileUtils.writeStringToFile(file, "line to append", "UTF-8", true);

Answer 3

this little thingy should do the trick:

package com.yourpackage;

// you're gonna want to optimize these imports
import java.io.*;
import org.apache.commons.io.*;

public final class AppendUtils {

    public static void appendToFile(final InputStream in, final File f)
            throws IOException {
        IOUtils.copy(in, outStream(f));
    }

    public static void appendToFile(final String in, final File f)
            throws IOException {
        appendToFile(IOUtils.toInputStream(in), f);
    }

    private static OutputStream outStream(final File f) throws IOException {
        return new BufferedOutputStream(new FileOutputStream(f, true));
    }

    private AppendUtils() {
    }

}

---

edit: my eclipse was broken, so it didn't show me the errors earlier. fixed errors

Answer 4

Careful. That implementation seems to be leaking a file handle...

public final class AppendUtils {

    public static void appendToFile(final InputStream in, final File f) throws IOException {
        OutputStream stream = null;
        try {
            stream = outStream(f);
            IOUtils.copy(in, stream);
        } finally {
            IOUtils.closeQuietly(stream);
        }
    }

    public static void appendToFile(final String in, final File f) throws IOException {
        InputStream stream = null;
        try {
            stream = IOUtils.toInputStream(in);
            appendToFile(stream, f);
        } finally {
            IOUtils.closeQuietly(stream);
        }
    }

    private static OutputStream outStream(final File f) throws IOException {
        return new BufferedOutputStream(new FileOutputStream(f, true));
    }

    private AppendUtils() {}

}

Answer 5

Actually, version 2.4 of apache-commons-io FileUtils now has append mode for collections as well.

Here's the Javadoc

And the maven dependency:

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
    <type>jar</type>
</dependency>

Answer 6

It has been implemented in 2.1 version of Apache IO. To append string to the file just pass true as an additional parameter in functions:

• FileUtils.writeStringToFile
• FileUtils.openOutputStream
• FileUtils.write
• FileUtils.writeByteArrayToFile
• FileUtils.writeLines

ex:

    FileUtils.writeStringToFile(file, "String to append", true);