java代码如何获取post返回数据呢?

可使用Servlet中的request对象请求
   并获取POST请求

    BufferedReader reader = request.getReader();
    StringBuilder sb = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
        sb.append(line);
    }
    String postData = sb.toString();    

POST请求为表单数据

    String parameterValue = request.getParameter("parameterName");    

POST请求为JSON数据

    ObjectMapper objectMapper = new ObjectMapper();
    Map<String, Object> postDataMap = objectMapper.readValue(postData, new TypeReference<Map<String,Object>>(){});