Java中复制字节流

因为InputStream只能进行一遍完整的读过程，之后里面就没有数据了，当我们需要读不止一次时，需要先复制出来。

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());