Java InputStream在Thread中关闭

发布时间：2020-12-15 04:26:56 所属栏目：Java 来源：网络整理

导读：我试图从线程中的InputStream读取. Thread应该运行的类看起来像这样 static private class Runner implements Runnable { private InputStream fis; private OutputStream fos; public Runner(InputStream fis,OutputStream fos) throws IOException { int b

我试图从线程中的InputStream读取.

Thread应该运行的类看起来像这样

static private class Runner implements Runnable {

    private InputStream fis;
    private OutputStream fos;

    public Runner(InputStream fis,OutputStream fos) throws IOException {

        int blu = fis.available();

        System.out.println(blu);

        this.fis = fis;

        int bla = this.fis.available();

        System.out.println(bla);
        this.fos = fos;
    }

    @Override
    public void run() {

        try {
            int bla = fis.available();

            System.out.println(bla);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println(fis);
        System.out.println(fos);

    }

}

Thread就是这样创建的

final Runnable runnable = new Runner(fis,fos);
final Thread thread = new Thread(runnable);
thread.start();

并且在线程上应该运行run方法.但是一旦执行它就会得到错误

java.nio.channels.ClosedChannelException

我调试了它,InputStream设置为关闭.

为什么在Thread中关闭InputStream？有没有我应该使用的替代方案？

编辑：

我忘了提到它们是在这样的试块中打开的,之后主要功能就结束了.

try (InputStream fis = Files.newInputStream(sourcePath)) {
        try (OutputStream fos = Files.newOutputStream(sinkPath)) {

            final Runnable runnable = new Runner(fis,fos);
            final Thread thread = new Thread(runnable);
            thread.start();
        }

    }

解决方法

当块退出时,那些 try-with-resources块将关闭它们各自的流.当您只计划使用块内的流时,这很好.但是因为你想在块结束后继续在另一个线程中使用流,所以去除块.

InputStream  fis = Files.newInputStream (sourcePath);
OutputStream fos = Files.newOutputStream(sinkPath);

final Runnable runnable = new Runner(fis,fos);
final Thread   thread   = new Thread(runnable);
thread.start();

（编辑：李大同）

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