java _io_随机读取读入流RandomAccessFile

• 随机读取和写入流RandomAccessFile

• 支持读取和写入随机访问文件

• RandomAccessFile raf=new RandomAccessFile(文件对象，读写模式);r只读，rw读和写

   private File f;
   //目的地
   private String dir;
   //所有分割后的文件存储路径
   private List<String> list;
   //每块大小
   private int blockSize;
   //块数
   private int size;
  

  public n(File f,String dir,int blockSize) { this.f=f; this.dir=dir; this.blockSize=blockSize; this.list=new ArrayList<String>; }

  //初始化 private void init() { //总长度 long len=this.f.length(); //块数 this.size=(int)Math.ceil(len*1.0/blockSize); //路径: for(int i=0;i<size;i++) { this.list.add(this.dir+i+this.f.getName()); }

  } //分割:计算每一块的起始位置及大小 public void split() {

  } public void t3(int i,int first,int real) throws IOException { RandomAccessFile raf=new RandomAccessFile(this.f,"r"); RandomAccessFile raf2=new RandomAccessFile(this.list.get(i),"rw");

   raf.seek(first);//从第二个位置开始
   
   byte[] flush=new byte[1024];
   int len=-1;
   while((len=raf.read(flush))!=-1)
   {
   	if(real>1024)
   	{
   		raf2.write(flush,0,len);
   		real-=1024;
   	}else
   	{
   
   	raf2.write(flush,0,real);
   	break;  //读取指定大小，读完退出
   }
   raf2.close();
   raf.close();
  

  } } public static void main(String[]args) {

  }

  }