java 写文件 flush_Java FileOutputStream flush()方法

Java FileOutputStream flush()方法

java.io.FilterOutputStream.flush() 用于刷新此输出流，并强制将所有缓冲的输出字节写出到该流中。

1 语法

public void flush()

2 参数

无

3 返回值

无

4 示例

package com.yiidian;

/**

* 一点教程网： http://www.yiidian.com

*/

/**

* java.io.FilterOutputStream.flush()方法的例子

*/

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FilterOutputStream;

import java.io.IOException;

import java.io.OutputStream;

public class Demo {

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("d://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("d://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();

}

}

}

输出结果为：

Character read: A

Java FileOutputStream flush()方法 java.io.FilterOutputStream.flush() 用于刷新此输出流，并强制将所有缓冲的输出字节写出到该流中。 1 语法 public void flush() 2 参数 无 3 返回值 无 4 示例 package com.yiidian; /** * 一点教程网： http://www.yiidian.com */ /** * java.io.FilterOutputStream.flush()方法的例子 */ import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FilterOutputStream; import java.io.IOException; import java.io.OutputStream; public class Demo { 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("d://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("d://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(); } } } 输出结果为： Character read: A