Java：通过Parse.com REST API将JSON对象作为JSONObject发送 [英] Java: Send Date Object as JSONObject through Parse.com REST API
问题描述
我正在使用HttpsUrlConnection通过Parse的REST API在Parse.com数据库中创建一个新对象。他们的REST API只接受JSON。我已经得到了一切工作，数据库将接受新的对象条目 - 除了当我尝试包括一个Date字段时。当我通过日期时，服务器完全拒绝对象。
我在他们的文档中找到了这个描述，以便在使用时如何在对象中添加一个Date字段REST API：
Parse手机客户端库还支持日期，二进制数据和关系数据。在REST API中，这些值被编码为JSON散列，__type字段设置为指示其类型，因此如果使用正确的编码，您可以读取或写入这些字段。
日期类型包含一个字段iso，其中包含以毫秒精度存储的ISO 8601格式的UTC时间戳记：YYYY-MM-DDTHH：MM：SS.MMMZ。
{
__type：Date，
iso：2011-08-21T18：02：52.249Z
}
所以如果我想创建一个新对象并将其传递给数据库，我假设我需要创建另一个JSONObject并在其对应的字段中传递它。但是，当我尝试的时候，它仍然拒绝它。下面是我尝试添加Date对象作为参数传递，存储在自己的JSONObject中。我究竟做错了什么？根据他们的文档，在JSON中发送Date对象的正确方法是什么？
// datePicked是一个Calendar对象
Date sendTime = datePicked.getTime（）;
SimpleDateFormat formatter = new SimpleDateFormat（yyyy-MM-dd HH：mm：ss）;
formatter.setTimeZone（TimeZone.getTimeZone（UTC））;
String sendTimeInUTC = formatter.format（sendTime）;
//将Date对象作为JSONObject存储，如指定
JSONObject dateAsObj = new JSONObject（）;
dateAsObj.put（__ type，Date）;
dateAsObj.put（iso，sendTimeInUTC）;
// jsonParam是发送到Parse的REST API的JSONObject
jsonParam.put（sendTime，dateAsObj）;
以下是http请求的完整功能，用于上下文和参考：
private void runHttpRequest（final String emailAddress，final String password，
String [] recipient，final String title，final String message）throws MalformedURLException {
//将电子邮件存储在Parse DB中，从Java servlet
String url =https://api.parse.com/1/classes/Email;
URL obj = new URL（url）;
HttpsURLConnection con = null;
try {
con =（HttpsURLConnection）obj.openConnection（）;
} catch（IOException e）{
System.out.println（无法连接到http链接）;
e.printStackTrace（）;
}
//添加请求头
try {
con.setRequestMethod（POST）;
} catch（ProtocolException e）{
System.out.println（无法设置为POST）;
e.printStackTrace（）;
}
con.setRequestProperty（X-Parse-Application-Id，*****************）;
con.setRequestProperty（X-Parse-REST-API-Key，*****************）;
con.setRequestProperty（Content-Type，application / json）;
JSONObject jsonParam = new JSONObject（）;
jsonParam.put（username，******）;
jsonParam.put（emailID，1）;
jsonParam.put（universalID，******）;
Gson converter = new Gson（）;
String recipientsInJson = converter.toJson（recipients）;
jsonParam.put（to，recipientsInJson）;
jsonParam.put（from，emailAddress）;
jsonParam.put（title，title）;
jsonParam.put（body，message）;
日期sendTime = datePicked.getTime（）;
//jsonParam.put(\"sendTime，sendTime）;
SimpleDateFormat formatter = new SimpleDateFormat（yyyy-MM-dd HH：mm：ss）;
formatter.setTimeZone（TimeZone.getTimeZone（UTC））;
String sendTimeInUTC = formatter.format（sendTime）;
System.out.println（UTC time+ sendTimeInUTC）;
JSONObject dateAsObj = new JSONObject（）;
dateAsObj.put（__ type，Date）;
dateAsObj.put（iso，sendTimeInUTC）;
System.out.println（dateAsObj.toString（））;
jsonParam.put（sendTime，dateAsObj）;
String urlParameters = jsonParam.toString（）;
//发送POST请求
con.setDoOutput（true）;
DataOutputStream wr = null;
try {
wr = new DataOutputStream（con.getOutputStream（））;
} catch（IOException e1）{
System.out.println（无法获取输出流）;
e1.printStackTrace（）;
}
try {
wr.writeBytes（urlParameters）;
} catch（IOException e）{
System.out.println（无法连接发送到Parse对象作为参数）;
e.printStackTrace（）;
}
try {
wr.flush（）;
} catch（IOException e）{
e.printStackTrace（）;
}
try {
wr.close（）;
} catch（IOException e）{
System.out.println（无法连接到关闭数据流连接）;
e.printStackTrace（）;
}
int responseCode = 0;
try {
responseCode = con.getResponseCode（）;
} catch（IOException e）{
System.out.println（无法连接以获取响应代码）;
e.printStackTrace（）;
}
System.out.println（\\\
Sending'POST'请求到URL：+ url）;
System.out.println（Post parameters：+ urlParameters）;
System.out.println（Response Code：+ responseCode）;
BufferedReader in = null;
尝试{
in = new BufferedReader（
new InputStreamReader（con.getInputStream（）））;
} catch（IOException e）{
System.out.println（无法获取输入流）;
e.printStackTrace（）;
}
String inputLine;
StringBuffer response = new StringBuffer（）;
尝试{
while（（inputLine = in.readLine（））！= null）{
response.append（inputLine）;
}
} catch（IOException e）{
System.out.println（无法读取行）;
e.printStackTrace（）;
}
try {
in.close（）;
} catch（IOException e）{
System.out.println（无法关闭输入流）;
e.printStackTrace（）;
}
//打印结果
System.out.println（response.toString（））;
}
任何帮助或输入都不胜感激。
您的格式与他们所需的格式不符。例如：
他们的：2011-08-21T18：02：52.249Z
你的：2011-08-21 18：02：52.249
你缺少 T 和 Z 。
所以尝试将您的格式更改为：
SimpleDateFormat formatter = new SimpleDateFormat（yyyy-MM-dd'THH：mm：ss'Z）;说实话，如果这个没有自动处理，我会感到惊讶 - 你试过了吗？只是 dateAsObj.put（iso，sendTime）？
I am trying to create a new object in my Parse.com database through Parse's REST API, using an HttpsUrlConnection. Their REST API only accepts JSON. I have gotten everything to work, where the database would accept the new object entry - except for when I attempt to include a Date field. When I do pass in a Date, the server rejects the object entirely.
I found this in their documentation this description for how to add a Date field in an object when using the REST API:
The Parse mobile client libraries also support dates, binary data, and relational data. In the REST API, these values are encoded as JSON hashes with the __type field set to indicate their type, so you can read or write these fields if you use the correct encoding.
The Date type contains a field iso which contains a UTC timestamp stored in ISO 8601 format with millisecond precision: YYYY-MM-DDTHH:MM:SS.MMMZ.
{
"__type": "Date",
"iso": "2011-08-21T18:02:52.249Z"
}
So if I want to create a new object and pass it to the database, I am assuming I need to create another JSONObject and pass it over in its corresponding field. However, when I tried that, it still rejected it. Below is my attempt at adding the Date object as a parameter to pass over, stored in its own JSONObject. What am I doing wrong? What is the right way of sendign a Date object in JSON, based on their docs?
//datePicked is a Calendar object
Date sendTime = datePicked.getTime();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
String sendTimeInUTC = formatter.format(sendTime);
//Storing the Date object as a JSONObject, as specified
JSONObject dateAsObj = new JSONObject();
dateAsObj.put("__type", "Date");
dateAsObj.put("iso", sendTimeInUTC);
//jsonParam is the JSONObject that is being sent over to Parse's REST API
jsonParam.put("sendTime", dateAsObj);
Here is the full function which makes the http request, for context and reference:
private void runHttpRequest(final String emailAddress, final String password,
String[] recipients, final String title, final String message) throws MalformedURLException {
//Stores email in Parse DB, from Java servlet
String url = "https://api.parse.com/1/classes/Email";
URL obj = new URL(url);
HttpsURLConnection con = null;
try {
con = (HttpsURLConnection) obj.openConnection();
} catch (IOException e) {
System.out.println("Failed to connect to http link");
e.printStackTrace();
}
//add request header
try {
con.setRequestMethod("POST");
} catch (ProtocolException e) {
System.out.println("Failed to set to POST");
e.printStackTrace();
}
con.setRequestProperty("X-Parse-Application-Id", "*****************");
con.setRequestProperty("X-Parse-REST-API-Key", "*******************");
con.setRequestProperty("Content-Type", "application/json");
JSONObject jsonParam = new JSONObject();
jsonParam.put("username", "******");
jsonParam.put("emailID", 1);
jsonParam.put("universalID", "******");
Gson converter = new Gson();
String recipientsInJson = converter.toJson(recipients);
jsonParam.put("to", recipientsInJson);
jsonParam.put("from", emailAddress);
jsonParam.put("title", title);
jsonParam.put("body", message);
Date sendTime = datePicked.getTime();
//jsonParam.put("sendTime", sendTime);
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
String sendTimeInUTC = formatter.format(sendTime);
System.out.println("UTC time" + sendTimeInUTC);
JSONObject dateAsObj = new JSONObject();
dateAsObj.put("__type", "Date");
dateAsObj.put("iso", sendTimeInUTC);
System.out.println(dateAsObj.toString());
jsonParam.put("sendTime", dateAsObj);
String urlParameters = jsonParam.toString();
// Send POST request
con.setDoOutput(true);
DataOutputStream wr = null;
try {
wr = new DataOutputStream(con.getOutputStream());
} catch (IOException e1) {
System.out.println("Failed to get output stream");
e1.printStackTrace();
}
try {
wr.writeBytes(urlParameters);
} catch (IOException e) {
System.out.println("Failed to connect to send over Parse object as parameter");
e.printStackTrace();
}
try {
wr.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
wr.close();
} catch (IOException e) {
System.out.println("Failed to connect to close datastream connection");
e.printStackTrace();
}
int responseCode = 0;
try {
responseCode = con.getResponseCode();
} catch (IOException e) {
System.out.println("Failed to connect to get response code");
e.printStackTrace();
}
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + urlParameters);
System.out.println("Response Code : " + responseCode);
BufferedReader in = null;
try {
in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
} catch (IOException e) {
System.out.println("Failed to get input stream");
e.printStackTrace();
}
String inputLine;
StringBuffer response = new StringBuffer();
try {
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
} catch (IOException e) {
System.out.println("Failed to read line");
e.printStackTrace();
}
try {
in.close();
} catch (IOException e) {
System.out.println("Failed to close input stream");
e.printStackTrace();
}
//print result
System.out.println(response.toString());
}
Any help or input would be appreciated.
解决方案 Your format doesn't match the one they've required. For example:
Theirs: 2011-08-21T18:02:52.249Z
Yours: 2011-08-21 18:02:52.249
You're missing the T and the Z.
So try changing your format to:
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
To be honest, I'd be surprised if this weren't handled automatically though - have you tried just dateAsObj.put("iso", sendTime)?
这篇关于Java：通过Parse.com REST API将JSON对象作为JSONObject发送的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
