java.io.FilterOutputStream.write(byte[] b, int off, int len) 方法从指定的字节数组开始到当前输出流关闭写入len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 -- 源缓冲区被写入到流

• off -- 开始在数据偏移

• len -- 字节写数

返回值

此方法不返回任何值。

异常

• IOException -- 如果发生I/ O错误。

例子

下面的例子显示java.io.FilterOutputStream.write(byte[] b, int off, int len) 方法用法。

package com.yiibai;

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();
      }
   }
}

让我们编译和运行上面的程序，这将产生以下结果：

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