要从java中的DataInputStream读取的未知缓冲区大小 [英] Unknown buffer size to be read from a DataInputStream in java

问题描述

我有以下声明：

DataInputStream = new DataInputStream（process.getInputStream（））;

我想打印此输入流的内容，但我不知道此流的大小。我该怎么读这个流并打印出来？

I would like to print the contents of this input stream but I dont know the size of this stream. How should I read this stream and print it?

推荐答案

所有Streams都很常见，提前知道长度。使用标准 InputStream 通常的解决方案是简单地调用读取直到 -1 被退回。

It is common to all Streams, that the length is not known in advance. Using a standard InputStream the usual solution is to simply call read until -1 is returned.

但我认为你已经用 DataInputStream包装了一个标准的 InputStream 有充分理由：解析二进制数据。 （注意：扫描仪仅用于文本数据。）

But I assume, that you have wrapped a standard InputStream with a DataInputStream for a good reason: To parse binary data. (Note: Scanner is for textual data only.)

JavaDoc for DataInputStream 向您展示，此类有两种不同的方式来指示EOF - 每种方法都返回 -1 或抛出 EOFException 。一条经验法则是：

The JavaDoc for DataInputStream shows you, that this class has two different ways to indicate EOF - each method either returns -1 or throws an EOFException. A rule of thumb is:

• 从 InputStream 继承的每个方法都使用return -1 convention，


• 每个方法 NOT 继承自 InputStream 抛出 EOFException 。

• Every method which is inherited from InputStream uses the "return -1" convention,
• Every method NOT inherited from InputStream throws the EOFException.

如果使用 readShort 例如，读取直到抛出异常，如果使用read（），则执行此操作直到 -1 返回。

If you use readShort for example, read until an exception is thrown, if you use "read()", do so until -1 is returned.

提示：在开头小心非常并从 DataInputStream中查找您使用的每个方法 - 经验法则可以打破。

Tip: Be very careful in the beginning and lookup each method you use from DataInputStream - a rule of thumb can break.

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