Java 克隆输入流
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原文地址: http://stackoverflow.com/questions/24471089/
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Clone InputStream
提问by Jan B
I'm trying to read data from an InputStream, which could either be a FileInputStream or an ObjectInputStream. In order to achieve this I'wanted to clone the stream and try to read the Object and in case of an exception convert the stream to a String using apache commons io.
我正在尝试从 InputStream 读取数据，它可以是 FileInputStream 或 ObjectInputStream。为了实现这一点，我想克隆流并尝试读取对象，并在发生异常时使用 apache commons io 将流转换为字符串。
PipedInputStream in = new PipedInputStream();
TeeInputStream tee = new TeeInputStream(stream, new PipedOutputStream(in));
Object body;
try {
ObjectInput ois = new ObjectInputStream(tee);
body = ois.readObject();
} catch (Exception e) {
try {
body = IOUtils.toString(in, Charset.forName("UTF-8"));
} catch (Exception e2) {
throw new MarshallerException("Could not convert inputStream");
}
}
Unfortunately this does not work as the program waits for incoming data when trying to convert the stream into a String.
不幸的是，这不起作用，因为程序在尝试将流转换in为字符串时等待传入的数据。
采纳答案by Jan B
As already commented by Boris Spider, it is possible to read the whole stream e.g. to a byte array stream and then open new streams on that resource:
正如 Boris Spider 已经评论过的那样，可以将整个流读取到例如字节数组流，然后在该资源上打开新流：
byte[] byteArray = IOUtils.toByteArray(stream);
InputStream input1 = new ByteArrayInputStream(byteArray);
InputStream input2 = new ByteArrayInputStream(byteArray);
Object body;
try {
ObjectInput ois = new ObjectInputStream(input1);
body = ois.readObject();
} catch (Exception e) {
try {
body = IOUtils.toString(input2, Charset.forName("UTF-8"));
} catch (Exception e2) {
throw new MarshalException("Could not convert inputStream");
}
}
