Java Java.io.FilterOutputStream.write() 方法

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  描述

  java.io.FilterOutputStream.write(byte[] b, int off, int len)方法将指定字节数组中从offset off开始的len个字节写入此输出流。
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  声明

  以下是java.io.FilterOutputStream.write(byte[] b, int off, int len)方法的声明-

   public void write(byte[] b, int off, int len)

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  参数

  • b要写入流的源缓冲区
  • off -数据中的起始偏移量
  • len要写入的字节数
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  返回值

  此方法不返回任何值。
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  异常

  IOException如果发生I / O错误。
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  例子

  下面的示例显示java.io.FilterOutputStream.write（byte [] b，int off，int len）方法的用法。

   
  package com.jc2182;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.FilterOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  
  public class FilterOutputStreamDemo {
     public static void main(String[] args) throws Exception {
        OutputStream os = null; 
        FilterOutputStream fos = null;
        FileInputStream fis = null;
        byte[] buffer = {65, 66, 67, 68, 69};
        int i = 0;
        char c;
        
        try {
           // create output streams
           os = new FileOutputStream("C://test.txt");
           fos = new FilterOutputStream(os);
  
           // writes buffer to the output stream
           fos.write(buffer, 2, 3);
                    
           // forces byte contents to written out to the stream
           fos.flush();
           
           // create input streams
           fis = new FileInputStream("C://test.txt");
           
           while((i = fis.read())!=-1) {
           
              // converts integer to the character
              c = (char)i;
              
              // prints
              System.out.println("Character read: "+c);
           }
           
        } catch(IOException e) {
           // if any I/O error occurs
           System.out.print("Close() is invoked prior to write()");
        } finally {
           // releases any system resources associated with the stream
           if(os!=null)
              os.close();
           if(fos!=null)
              fos.close();
        }
     }
  }
  

  让我们编译并运行以上程序，这将产生以下结果-

   
  Character read: C
  Character read: D
  Character read: E