byte[] 和inputStream相互转化

1：byte[] -> InputStream 

InputStream sbs = new ByteArrayInputStream(byte[] buf); 

2：InputStream - > byte[] 

ByteArrayOutputStream swapStream = new ByteArrayOutputStream(); 

byte[] buff = new byte[100]; //buff用于存放循环读取的临时数据 

int rc = 0; 

while ((rc = inStream.read(buff, 0, 100)) > 0) { 

swapStream.write(buff, 0, rc); 

} 

byte[] in_b = swapStream.toByteArray(); //in_b为转换之后的结果