如何通过ServletInputStream读取http请求传入的数据

/**
 * 增加数据 
 * @param module
 * @param function
 * @param system
 * @param platform
 * @param time
 * @param status
 * @return ModelAndView
 * @throws IOException 
 */
@RequestMapping("/insertOne")
public ModelAndView insertOne(HttpServletRequest req) throws IOException {
	ServletInputStream ris = req.getInputStream();
	StringBuilder content = new StringBuilder();
	byte[] b = new byte[1024];
	int lens = -1;
	while ((lens = ris.read(b)) > 0) {
		content.append(new String(b, 0, lens));
	}
	String strcont = content.toString();// 内容	
	JSONObject jsonObj = JSONObject.fromObject(strcont);
	
	DBObject obj = new BasicDBObject();
	obj.put("module", jsonObj.getString("module"));
	obj.put("function", jsonObj.getString("function"));
	obj.put("system", jsonObj.getString("system"));
	obj.put("platform", jsonObj.getString("platform"));
	obj.put("time", jsonObj.getString("time"));
	obj.put("status", jsonObj.getString("status"));
	
	Map<String, Object> map = new HashMap<String, Object>();	
	int len = ((DBManager) conn).insertOne(obj);		
	map.put("status", (len == 0)?("SUCCESS"):("ERROR"));
	return MVC.toString(map);
}

JSONObject jsonObj = JSONObject.fromObject(strcont);
System.out.println(jsonObj.getString("module"));

ServletInputStream sin=request.getInputStream();