Java ObjectInputStream skipBytes()用法及代码示例

ObjectInputStream类skipBytes()方法

• skipBytes() 方法可在java.io包。
• skipBytes() 方法用于从流中跳过给定数量的字节。
• skipBytes() 方法是一个非静态方法，它只能通过类对象访问，如果我们尝试使用类名访问方法，那么我们将得到一个错误。
• skipBytes() 方法可能会在跳过字节时抛出异常。
  IOException:在执行时遇到任何输入/输出错误时可能会抛出此异常。

用法:

    public int skipBytes(int number);

参数：

• int number– 表示要跳过的字节数。

返回值：

该方法的返回类型是int，它返回跳过的确切字节数。

例：

// Java program to demonstrate the example 
// of int skipBytes(int number)
// method of ObjectInputStream

import java.io.*;

public class SkipBytesOfOIS {
 public static void main(String[] args) throws Exception {
  // Instantiates ObjectOutputStream , ObjectInputStream 
  // FileInputStream and FileOutputStream
  FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
  ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
  FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
  ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);

  // By using writeUTF() method is to write
  // the encoded string in UTF-8 to the 
  // obj_out_stm stream
  obj_out_stm.writeUTF("JAVA WORLD");

  obj_out_stm.flush();

  // By using skipBytes() method is to skip
  // bytes of data to the stream	
  int skip_byte = obj_in_stm.skipBytes(2);
  System.out.println("obj_in_stm.skipBytes(2):" + skip_byte);

  while (obj_in_stm.available() > 0) {
   // By using readByte() method is to read
   // corresponding byte from the obj_in_stm 
   byte val = (byte) obj_in_stm.readByte();
   System.out.println("obj_in_stm.readByte():" + val);
  }

  // By using close() method is to 
  // close all the streams 
  file_in_stm.close();
  file_out_stm.close();
  obj_in_stm.close();
  obj_out_stm.close();
 }
}

输出

obj_in_stm.skipBytes(2):2
obj_in_stm.readByte():74
obj_in_stm.readByte():65
obj_in_stm.readByte():86
obj_in_stm.readByte():65
obj_in_stm.readByte():32
obj_in_stm.readByte():87
obj_in_stm.readByte():79
obj_in_stm.readByte():82
obj_in_stm.readByte():76
obj_in_stm.readByte():68