Guava Files

Examples All in One  

package guava;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;

import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import com.google.common.io.BaseEncoding;
import com.google.common.io.ByteSink;
import com.google.common.io.ByteSource;
import com.google.common.io.Closer;
import com.google.common.io.FileWriteMode;
import com.google.common.io.Files;

public class FilesExamples {

	public static void main(String[] args) throws IOException {
		File from = new File("from");
		File to = new File("to");

		// Copy File
		Files.copy(from, to);

		// Moving File
		Files.move(from, to);

		// Reading File --> List<String>
		List<String> lines = Files.readLines(from, Charset.defaultCharset());

		// Hashing File
		HashCode code = Files.hash(from, Hashing.md5());

		// Writing & Appending
		Files.write("hello world ! ".getBytes(), to);
		Files.append("appended string", to, Charset.defaultCharset());

		// Source & Sink
		ByteSource byteSource = Files.asByteSource(from);
		byte[] array = byteSource.read();

		ByteSink byteSink = Files.asByteSink(to, FileWriteMode.APPEND);
		byteSink.write(Files.toByteArray(from));

		// Copy from ByteSource --> ByteSink
		Files.asByteSource(from).copyTo(
				Files.asByteSink(to, FileWriteMode.APPEND));

		// Closer
		// Make Sure all registered closeable object is closed
		// When closer.close() is called
		Closer closer = Closer.create();
		BufferedReader reader = new BufferedReader(new FileReader(from));
		BufferedWriter writer = new BufferedWriter(new FileWriter(to));
		closer.register(reader);
		closer.register(writer);
		closer.close();

		// Base-Encoding
		BaseEncoding encoding = BaseEncoding.base64();
		encoding.encode(Files.toByteArray(from));
	}

}