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Java IO流操作(PipeInputStream、SequenceInputStream、BufferedInputStream)

开发者 https://www.devze.com 2024-10-29 12:21 出处:网络 作者: @一头雾水@
目录一、PipeInputStream二、SequenceInputStream三、BufferedInputStream一、PipeInputStream 1、介绍。
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。

Java IO流操作(PipeInputStream、SequenceInputStream、BufferedInputStream)

4、结果。

Java IO流操作(PipeInputStream、SequenceInputStream、BufferedInputStream)

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。

Java IO流操作(PipeInputStream、SequenceInputStream、BufferedInputStream)

4、结果。

Java IO流操作(PipeInputStream、SequenceInputStream、BufferedInputStream)

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