package shi; import java.io.*; public class suiji { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { RandomAccessFile raf=null; File f=new File("F:/test/123.txt"); try { raf=new RandomAccessFile(f,"rw"); // seek跳过文件本身的长度,向结尾处写入 raf.seek(f.length()); byte[]b=" 外星的小EZ你好啊".getBytes(); raf.write(b); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ if(raf!=null){ raf.close(); } } } }