void write(byte b, int off, int len)

描述

所述java.io.FilterOutputStream.write（byte [] b，int off，int len）方法从指定的字节数组偏移量off开始此输出流写入len个字节。

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)

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

返回值

此方法不返回任何值。

异常

IOException - 如果发生I / O错误。

sl

以下示例显示了java.io.FilterOutputStream.write（byte [] b，int off，int len）方法的用法。

package com.tutorialspoint;

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();
      }
   }
}

让我们编译并运行上面的程序，这将产生以下结果

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