Java IO流操作(PipeInputStream、SequenceInputStream、BufferedInputStream)
目录
- 一、PipeInputStream
- 二、SequenceInputStream
- 三、BufferedInputStream
一、PipeInputStream
1、介绍。
管道流的主要作用是可以进行两个线程间的通讯,分为管道输入流(PipeOutputStream)和管道输出流(PipeInputStream)。如果要想进行管道输出,则必须把输出流连在输入流之上
2、代码。
private static final String Pre_Path = "G:\\项目测试\\io流文件测试\\"; public static void main(String[] args) { pipedStreamTest();//进行两个线程之间的通信 } //管道--进行两个线程之间的通信 private static void pipedStreamTest() { SendPipedThread sendThread = new SendPipedThread(); sendThread.start(); ReceivePipedThread receiveThread = new ReceivePipedThread(); receiveThread.start(); try { sendThread.outputStream.connect(receiveThread.inputStream); Thread.sleep(10000);//10S sendThread.stopThread(); receiveThread.stopThread(); } catch (Exception e) { e.printStackTrace(); } } //管道--每隔500ms,输出当前时间的字节数组 static class SendPipedThread extends Thread { PipedOutputStream outputStream = new PipedOutputStream();//输出流 @Override public void run() { try { while (outputStream != null) { String writeStr = "时间:" + DateUtils.nowDateStr("yyyy-MM-dd hh:mm:ss") + " "; System.out.println("Send线程发送:" + writeStr); outputStream.write(writeStr.getBytes()); Thread.sleep(500); } } catch (Exception e) { e.printStackTrace(); } } void stopThread() { try { if (outputStream != null) { outputStream.close(); } } catch (Exception e) { e.printStackTrace(); } } } //管道--获取连接管道的字节数组 static class ReceivePipedThread extends Thread { PipedInputStream inputStream = new PipedInputStream();//输入流 @Override public void run() { try { while (inputStream != null) { byte[] readBytes = new byte[1024]; int len; while ((len = inputStream.read(readBytes)) != -1) { String readStr = new String(readBytes); System.out.println("Receive线程接收:" + readStr); } Thread.sleep(10); } } catch (Exception e) { e.printStackTrace(); } } void stopThread() { try { if (inputStream != null) { inputStream.close(); } } catch (Exception e) { e.printStackTrace(); } } }
3、结果。
Connected to the target VM, address: '127.0.0.1:58908', transport: 'socket'
Send线程发送:时间:2019-10-24 03:50:40 Send线程发送:时间:2019-10-24 03:50:40 Receive线程接收:时间:2019-10-24 03:50:40 时间:2019-10-24 03:50:40 &nb编程客栈sp;  www.devze.com; Send线程发送:时间:2019-10-24 03:50:41 Send线程发送:时间:2019-10-24 03:50:41 Receive线程接收:时间:2019-10-24 03:50:41 时间:2019-10-24 03:50:41 Send线程发送:时间:2019-10-24 03:50:42 Send线程发送:时间:2019-10-24 03:50:42 Receive线程接收:时间:2019-10-24 03:50:42 时间:2019-10-24 03:50:js42 Send线程发送:时间:2019-10-24 03:50:43 Send线程发送:时间:2019-10-24 03:50:43 Receive线程接收:时间:2019-10-24 03:50:43 时间:2019-10-24 03:50:43 Send线程发送:时间:2019-10-24 03:50:44 Send线程发送:时间:2019-10-24 03:50:44 Receive线程接收:时间:2019-10-24 03:50:44 时间:2019-10-24 03:50:44 Send线程发送:时间:2019-10-24 03:50:45 Send线程发送:时间:2019-10-24 03:50:45 Receive线程接收:时间:2019-10-24 03:50:45 时间:2019-10-24 03:50:45 Send线程发送:时间:2019-10-24 03:50:46 Send线程发送:时间:2019-10-24 03:50:46 Receive线程接收:时间:2019-10-24 03:50:46 时间:2019-10-24 03:50:46 Send线程发送:时间:2019-10-24 03:50:47 Send线程发送:时间:2019-10-24 03:50:47 Receive线程接收:时间:2019-10-24 03:50:47 时间:2019-10-24 03:50:47 Send线程发送:时间:2019-10-24 03:50:48 Send线程发送:时间:2019-10-24 03:50:48 Receive线程接收:时间:2019-10-24 03:50:48 时间:2019-10-24 03:50:48 Send线程发送:时间:2019-10-24 03:50:49 Send线程发送:时间:2019-10-24 03:50:49 Java.io.IOException: Pipe closed at java.io.PipedInputStream.read(PipedInputStream.java:307) at java.io.PipedInputStream.read(PipedInputStream.java:377) at java.io.InputStream.read(InputStream.java:101) at com.zxj.reptile.test.IOStreamTest$ReceivePipedThread.run(IOStreamTest.java:211) Send线程发送:时间:2019-10-24 03:50:50 java.io.IOException: Pipe closed at java.io.PipedInputStream.checkStateForReceive(PipedInputStream.java:260) at java.io.PipedInputStream.receive(PipedInputStream.javajavascript:226) at java.io.PipedOutputStream.write(PipedOutputStream.java:149) at java.io.OutputStream.write(OutputStream.java:75) at com.zxj.reptile.test.IOStreamTest$SendPipedThread.run(IOStreamTest.java:182) Disconnected from the target VM, address: '127.0.0.1:58908', transport: 'socket' Process finished with exit code 0
二、SequenceInputStream
1、介绍。
SequenceInputStream 可以将两个或多个其他 InputStream 合并为一个。 首先,SequenceInputStream 将读取第一个 InputStream 中的所有字节,然后读取第二个 InputStream 中的所有字节。 这就是它被称为 SequenceInputStream 的原因,因为 InputStream 实例是按顺序读取的。
2、代码。
private static final String Pre_Path = "G:\\项目测试\\io流文件测试\\"; public static void main(String[] args) { sequenceStreamTest();//将多个文件复制到同一个文件中 }
//将多个文件复制到同一个文件中 private static void sequenceStreamTest() { InputStream inputStream = null;//输入流 OutputStream outputStream = null;//输出流 try { outputStream = new FileOutputStream(Pre_Path + "sequenceStream\\输出文件.txt");//输出流 Vector<InputStream> vector = new Vector<>(); vector.add(new FileInputStream(Pre_Path + "sequenceStream\\a.txt")); vector.add(new FileInputStream(Pre_Path + "sequenceStream\\b.txt")); vector.add(new FileInputStream(Pre_Path + "sequenceStream\\c.txt")); inputStream = new SequenceInputStream(vector.elements()); //从输入流读取0 到 255数量的字节,并写入输出流中 int readByte; while ((readByte = inputStream.read()) != -1) { outputStream.write(readByte); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (inputStream != null) { inputStream.close();//SequenceInputStream的close,会将里面的各个流全部关闭 } if (outputStream != null) { outputStream.close(); } } catch (Exception e) { e.printStackTrace(); } } }
3、测试用例。
4、结果。
三、BufferedInputStream
1、介绍。
BufferedInputStream继承于FilterInputStream,提供缓冲输入流功能。缓冲输入流相对于普通输入流的优势是,它提供了一个缓冲数组,每次调用read方法的时候,它首先尝试从缓冲区里读取数据,若读取失败(缓冲区无可读数据),则选择从物理数据源(譬如文件)读取新数据(这里会尝试尽可能读取多的字节)放入到缓冲区中,最后再将缓冲区中的内容部分或全部返回给用户.由于从缓冲区里读取数据远比直接从物理数据源(譬如文件)读取速度快。
2、代码。
private static final String Pre_Path = "G:\\项目测试\\io流文件测试\\"; public static void main(String[] args) { bufferedStreamTest();//文件的复制(字节缓冲流) }
//文件的复制(字节缓冲流) private static void bufferedStreamTest() { InputStream inputStream = null;//输入流 OutputStream outputStream = null;//输出流 try { inputStream = new BufferedInputStream(new FileInputStream(Pre_Path + "bufferStream\\test1.txt")); outputStream = new BufferedOutputStream(new FileOutputStream(Pre_Path + "bufferStream\\test2.txt")); //从输入流读取0 到 255数量的字节,并写入输出流中 byte[] readBytes = new byte[1024]; int len; while ((len = inputStream.read(readBytes)) != -1) { System.out.println("读取到的字符:\n" + new String(readBytes)); outputStream.write(readBytes, 0, len); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (inputStream != null) { inputStream.close(); } if (outputStream != null) { outputStream.close(); } } catch (Exception e) { e.printStackTrace(); www.devze.com } } }
3、测试用例。
4、结果。
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