restful httpclient request中文乱码解决办法

public static String getPostJson(HttpServletRequest request){String s = "";try{ request.setCharacterEncoding("UTF-8"); ServletInputStream in = request.getInputStream(); int len = request.getContentLength(); if (len <= 0) {    return ""; } byte[] buffer = new byte[len]; in.read(buffer); s = new String(buffer,"UTF-8");}catch(Exception re){re.printStackTrace();}return s;}