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(); 
request.setCharacterEncoding('UTF-8'); resp