使用IOUtils可以做到这一点。看我的例子：
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import org.apache.commons.io.IOUtils;public class SourceCodeProgram { public static void main(String[] args) throws Exception { IOCopier.joinFiles(new File("D:/d.txt"), new File[] { new File("D:/s1.txt"), new File("D:/s2.txt") }); }}class IOCopier { public static void joinFiles(File destination, File[] sources) throws IOException { OutputStream output = null; try { output = createAppendableStream(destination); for (File source : sources) { appendFile(output, source); } } finally { IOUtils.closeQuietly(output); } } private static BufferedOutputStream createAppendableStream(File destination) throws FileNotFoundException { return new BufferedOutputStream(new FileOutputStream(destination, true)); } private static void appendFile(OutputStream output, File source) throws IOException { InputStream input = null; try { input = new BufferedInputStream(new FileInputStream(source)); IOUtils.copy(input, output); } finally { IOUtils.closeQuietly(input); } }}如果您不能使用IOUtils lib，请编写自己的实现。例：
class IOUtils { private static final int BUFFER_SIZE = 1024 * 4; public static long copy(InputStream input, OutputStream output) throws IOException { byte[] buffer = new byte[BUFFER_SIZE]; long count = 0; int n = 0; while (-1 != (n = input.read(buffer))) { output.write(buffer, 0, n); count += n; } return count; } public static void closeQuietly(Closeable output) { try { if (output != null) { output.close(); } } catch (IOException ioe) { ioe.printStackTrace(); } }}
