Java中複製字節流

因爲InputStream只能進行一遍完整的讀過程，之後裏面就沒有數據了，當我們需要讀不止一次時，需要先複製出來。

ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int readLen;
try {
	while ((readLen = clientSocket.getInputStream().read(buffer)) != -1) {
	baos.write(buffer, 0 ,readLen);
} catch (IOException e) {}
InputStream ips1 = new ByteArrayInputStream(baos.toByteArray());
InputStream ips2 = new ByteByteArrayInputStream(baos.toByteArray());