Java实现多个文档合并输出到一个文档

package First;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.nio.channels.FileChannel;import java.nio.channels.WritableByteChannel;public class Test {    public static void main(String params[]) throws Exception {    String[] iF = new String[] {"E:/test1.txt", "E:/test2.txt", "E:/test3.txt", "E:/test4.txt" };    String oF = "E:/out.txt";        FileOutputStream output = new FileOutputStream(new File(oF));    WritableByteChannel targetChannel = output.getChannel();        for(int i =0; i<iF.length; i++){      FileInputStream input = new FileInputStream(iF[i]);      FileChannel inputChannel = input.getChannel();            inputChannel.transferTo(0, inputChannel.size(), targetChannel);            inputChannel.close();      input.close();    }    targetChannel.close();    output.close();    System.out.println("All jobs done...");      }  }