问题
I converted an int to a byte array using ByteBuffer's putInt() method. How do I do the opposite? So convert those bytes to an int?
Furthermore, I converted a string to an array of bytes using the String's getBytes() method. How do I convert it the other way round? The bytesArray.getString() does not return a readable string. I get things like BF@DDAD
回答1:
You can use the ByteBuffer.getInt method, specifying the offset at which the integer occurs, to convert a series of bytes into an integer. Alternatively, if you happen to know the byte ordering, you can use bitwise operators to explicitly reconstruct the 32-bit integer from its 8-bit octets.
To convert an array of bytes into a String, you can use the String(byte[]) constructor to construct a new String out of the byte array. For example:
byte[] bytes = /* ... get array of bytes ... */
String fromBytes = new String(bytes);
来源：https://stackoverflow.com/questions/7395695/how-to-convert-from-bytebuffer-to-integer-and-string