JAVA 后台请求 返回JSON 乱码 问题解决方案

public  static ReturnMsg> tripartite(String token) throws JsonProcessingException {
   String urlTemp="url";
   ReturnMsg> returnMsg = new ReturnMsg<>(0, "请求第三方 成功）");
   StringBuilder json = new StringBuilder();
   try {
      URL httpurl= new URL(urlTemp);
      URLConnection yc = httpurl.openConnection();//打开链接
      yc.setRequestProperty("token",token);
      BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream(), "utf-8"));// 防止乱码
      String inputLine = null;
      while ((inputLine = in.readLine()) != null) {
         json.append(inputLine);
      }
      in.close();
   } catch (MalformedURLException e) {//http协议异常
   } catch (IOException e) {//读取异常
   }
   returnMsg.setData(ParseDataUtil.getObjectMapper().readValue(json.toString(), new TypeReference>() {
   }));
   return returnMsg;

}