Servlet处理Json请求数据包

request.setCharacterEncoding('UTF-8'); response.setContentType('text/html;charset=UTF-8');
String acceptjson = '';
BufferedReader br = new BufferedReader(new InputStreamReader( (ServletInputStream)
request.getInputStream(), 'utf-8'));
StringBuffer sb = new StringBuffer('');
String temp;
while ((temp = br.readLine()) != null)
{
    sb.append(temp);
}
br.close();
acceptjson = sb.toString();