struts json result乱码有关问题

struts json result乱码问题
JSONUtil.writeJSONToResponse(SerializationParams serializationParams)

...try {    out = new GZIPOutputStream(response.getOutputStream());    in = new ByteArrayInputStream(json.getBytes());    byte[] buf = new byte[1024];    int len;    while ((len = in.read(buf)) > 0) {        out.write(buf, 0, len);    }} finally {    if (in != null)        in.close();    if (out != null) {        out.finish();        out.close();    }}...

in = new ByteArrayInputStream(json.getBytes(serializationParams.getEncoding()));