import com.google.common.base.Charsets; import com.google.common.io.CharSink; import com.google.common.io.CharSource; import com.google.common.io.Files; import java.io.File; import java.io.IOException; public class GuavaIOExample { public static void main(String[] args) { File inputFile = new File("input.txt"); File outputFile = new File("output.txt"); try { CharSource charSource = Files.asCharSource(inputFile, Charsets.UTF_8); String content = charSource.read(); CharSink charSink = Files.asCharSink(outputFile, Charsets.UTF_8); charSink.write(content); } catch (IOException e) { e.printStackTrace(); } } }