关于如何提高Java String到byte []转换性能的任何建议？

I've inherited a piece of code that makes intensive use of String -> byte[] conversions and vice versa for some homegrown serialisation code. Essentially the Java objects know how to convert their constituent parts into Strings which then get converted into a byte[]. Said byte array is then passed through JNI into C++ code that reconstitutes the byte[] into C++ std::strings and uses those to bootstrap C++ objects which mirror the Java objects. There is a little more to it but this is a high level view of how this piece of code works; The communication works like this in both directions such that the C++ -> Java transition is a mirror image of the Java -> C++ transition I mentioned above.I've inherited a piece of code that makes inten