Java.io.FilterOutputStream.flush() 方法

描述

java.io.FilterOutputStream.flush() 方法刷新此输出流并强制将任何缓冲的内容写出到流中。

声明

以下是 java.io.FilterOutputStream.flush() 方法的声明 −

public void flush()

参数

NA

返回值

此方法不返回任何值。

异常

IOException − 如果发生 I/O 错误。

示例

下面的例子展示了 java.io.FilterOutputStream.flush() 方法的使用。

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;
      int i = 0;
      char c;
      
      try {
         // create output streams
         os = new FileOutputStream("C://test.txt");
         fos = new FilterOutputStream(os);

         // writes byte to the output stream
         fos.write(65);
                  
         // forces byte contents to written out to the stream
         fos.flush();
         
         // create output streams
         fis = new FileInputStream("C://test.txt");
         
         // read byte
         i=fis.read();
         
         // convert integer to characters
         c = (char)i;
         
         // prints
         System.out.print("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，这将产生下面的结果 −

Close() is invoked prior to write()