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将数据输入转换为数据输入流？

发布于 2024-12-06 14:17:35 字数 58 浏览 0 评论 0原文

java中如何将DataInput转换为DataInputStream？我需要知道数据输入的大小。

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乖乖 2024-12-13 14:17:35

由于根据定义，流实际上没有开始或结束，因此没有万无一失的方法来知道有多少可用，因此您只需以固定大小的块从流中读取。听起来你最好使用普通的旧 .read() 而不是 readFully()：

    DataInputStream dis = new DataInputStream(...);
    byte[] buf = new byte[1024];
    int lastRead = 0;

    do {
        lastRead = dis.read(buf);
        //do something with 'buf' here

    } while (lastRead > 0);

Since a stream, by definition, really has no begining or end and thus no fool proof way of knowing how much is available, you just have to read from the stream in fixed sized chunks. It almost sounds like you'd be better off with plain old .read() rather than readFully():

    DataInputStream dis = new DataInputStream(...);
    byte[] buf = new byte[1024];
    int lastRead = 0;

    do {
        lastRead = dis.read(buf);
        //do something with 'buf' here

    } while (lastRead > 0);

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番薯 2024-12-13 14:17:35

当您想知道要读取多少字节时，您会遇到困难。最简单的解决方案是将其转换为 ByteArrayInputStream 并使用它的 available() 方法来了解有多少字节可供读取。

以下示例对我有用

DataInput in = (...);
ByteArrayInputStream bis = (ByteArrayInputStream) in;
byte[] buffer = new byte[bis.available()];
in.readFully(buffer);
//use buffer as your wish

You'll encounter difficulty when you want know how many bytes to be read. Simplest solution is to cast it to a ByteArrayInputStream and use it's available() method to get to know how many bytes are available for reading.

Following example worked for me

DataInput in = (...);
ByteArrayInputStream bis = (ByteArrayInputStream) in;
byte[] buffer = new byte[bis.available()];
in.readFully(buffer);
//use buffer as your wish

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