字节缓冲流字节缓冲流结构
介绍字节缓冲流
lBufferOutputStream:实现缓冲输出流。 通过设置这样的输出流,应用程序可以将字节写入底层输出流,而不需要对每个字节进行调用
lBufferedInputStream:创建BufferedInputStream将创建内部缓冲区数组。 当从流中读取或跳过字节时,内部缓冲区将根据需要从包含的输入流中重新填充,许多字节一次
构造方法:
方法名 说明 BufferedOutputStream(OutputStream out)创建字节缓冲输出流对象BuferedInputstreamer(InputStream in)创建字节缓冲输入流对象
public class BufferStreamDemo { public static void main(String[] args) throws IOException { //字节缓冲输出流:BufferedOutputStream(OutputStream out) BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("51cto\\bos.txt")); //写数据 bos.write("hello\r\n".getBytes()); bos.write("world\r\n".getBytes()); ///释放资源 bos.close(); ///字节缓冲输入流:BufferedInputStream(InputStream in) BufferedInputStream bis = new BufferedInputStream(new FileInputStream("51cto\\bos.txt")); ///一次读取字节数据 // int by; // while ((by=bis.read())!=-1) { // System.out.print((char)by); // } ///一次读取字节数组数据 byte[] bys = new byte[1024]; int len; while ((len=bis.read(bys))!=-1) { System.out.print(new String(bys,0,len)); } ///释放资源 bis.close(); } }
使用字节流-复制视频文件把 E:\51cto.avi 复制到模块目录下
public class CopyAviDemo { public static void main(String[] args) throws IOException { //记录开始时间 long startTime = System.currentTimeMillis(); ///复制视频 // method1(); // method2(); // method3(); method4(); //记录结束时间 long endTime = System.currentTimeMillis(); System.out.println("共耗时:" + (endTime - startTime) + "毫秒"); } //字节缓冲流一次读写字节数组 public static void method4() throws IOException { BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\51cto\字节.avi")); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("myByteStream\\字节流复制图片.avi")); byte[] bys = new byte[1024]; int len; while ((len=bis.read(bys))!=-1) { bos.write(bys,0,len); } bos.close(); bis.close(); } ////字节缓冲流一次读写字节 public static void method3() throws IOException { BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\51cto\字节.avi")); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("myByteStream\\字节流复制图片.avi")); int by; while ((by=bis.read())!=-1) { bos.write(by); } bos.close(); bis.close(); } ///基本字节流一次读写字节数组 public static void method2() throws IOException { FileInputStream fis = new FileInputStream("E:\51cto\字节.avi"); FileOutputStream fos = new FileOutputStream("myByteStream\\字节流复制图片.avi"); byte[] bys = new byte[1024]; int len; while ((len=fis.read(bys))!=-1) { fos.write(bys,0,len); } fos.close(); fis.close(); } ///基本字节流一次读写一个字节 public static void method1() throws IOException { FileInputStream fis = new FileInputStream("E:\51cto\字节.avi"); FileOutputStream fos = new FileOutputStream("myByteStream\\字节流复制图片.avi"); int by; while ((by=fis.read())!=-1) { fos.write(by); } fos.close(); fis.close(); } }
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