JAVA Io 缓冲输入输出流

java中提供带缓冲的输入输出流。在打开文件进行写入或读取操作时，都会加上缓冲，提高了IO读写性能。

1. BufferedInputStream 缓冲输入流

2. BufferedOutputStream 缓冲输出流

使用带缓冲的输入输出流写一个拷贝文件的操作。

package com.dcz.io;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class BufferStream {

	/**
	 * 拷贝文件带缓冲
	 *
	 * @param srcFile
	 * @param destFile
	 * @throws Exception
	 */
	public static void copyFileByBuffer(File srcFile, File destFile)
			throws Exception {

		// 缓冲输入流
		BufferedInputStream bufferInputStream = new BufferedInputStream(
				new FileInputStream(srcFile));
		// 缓冲输出流
		BufferedOutputStream bufferOutputStream = new BufferedOutputStream(
				new FileOutputStream(destFile));

		int bytes = 0;
		while ((bytes = bufferInputStream.read()) != -1) {
			bufferOutputStream.write(bytes);
			bufferOutputStream.flush();
		}
		bufferOutputStream.close();
		bufferInputStream.close();
	}

	public static void main(String[] args) throws Exception {

		BufferStream.copyFileByBuffer(new File("D:\\cglib-3.1.jar"), new File(
				"D:\\aa.jar"));
	}

}