Java Java.io.FilterOutputStream.write() 方法

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。

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。

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