一些搜集的实用方法

Java InputStream 转 Byte

public byte[] InputStreamToByte(InputStream iStrm) throws IOException {
ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
int ch;
while ((ch = iStrm.read()) != -1)
{
bytestream.write(ch);
}
byte imgdata[]=bytestream.toByteArray();
bytestream.close();
return imgdata;
}