readrandomaccessfile.java

精通Java核心技术源代码

import java.io.*;

   public class ReadRandomAccessFile 
  {
 	    public static void main(String[] args) 
       {
	        try {
	            long dataPosition = 0;
	            int data = 0;
               RandomAccessFile raf = new RandomAccessFile("datafile", "r");
               dataPosition = raf.readLong();// 获得欲读数据的位置
               raf.seek(dataPosition);      
               data = raf.readInt();        // 读数据
               raf.close();
               System.out.println("The data is: " + data);
           }
  	        catch (FileNotFoundException e) {
	            System.err.println("This shouldn't happen: " + e);
           } 
           catch (IOException e) {
	            System.err.println("Writing error: " + e);
	        }
       }
   }