Java对文件的随机读写以及压缩处理操作

import java.io.*;
class ep10_12{
  public static void main(String args[]) throws IOException{
    try{
      BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
      String s=in.readLine();
      RandomAccessFile myFile=new RandomAccessFile("ep10_12.log","rw");
      myFile.seek(myFile.length()); //移动到文件结尾
      myFile.writeBytes(s+"\n"); //写入数据
      myFile.close();
    }
    catch(IOException e){}
  }
}

import java.io.*;
import java.util.*;
import java.util.zip.*;
class ep10_13{
  public static void main(String args[]) throws IOException{
    FileOutputStream a=new FileOutputStream("ep10_13.zip");
    //处理压缩文件
    ZipOutputStream out=new ZipOutputStream(new BufferedOutputStream(a));
    for(int i=0;i<args.length;i++){ //对命令行输入的每个文件进行处理
      System.out.println("Writing file"+args[i]);
      BufferedInputStream in=new BufferedInputStream(new FileInputStream(args[i]));
      out.putNextEntry(new ZipEntry(args[i])); //设置 ZipEntry 对象
      int b;
      while((b=in.read())!=-1)
        out.write(b); //从源文件读出，往压缩文件中写入
      in.close();
    }
    out.close();
    //解压缩文件并显示
    System.out.println("Reading file");
    FileInputStream d=new FileInputStream("ep10_13.zip");
    ZipInputStream inout=new ZipInputStream(new BufferedInputStream(d));
    ZipEntry z;

    while((z=inout.getNextEntry())!=null){ //获得入口
      System.out.println("Reading file"+z.getName()); //显示文件初始名
      int x;
      while((x=inout.read())!=-1)
        System.out.write(x);
      System.out.println();
    }
    inout.close();
  }
}