500内部服务器错误GAE试图JSON字符串发送给客户端Android版？ [英] 500 Internal Server Error GAE while trying to send JSON string to client android side?
问题描述
我在谷歌应用程序引擎的工作存储data.My应用程序是一个Android应用程序，我想，当我想收到的ArrayList作为JSON文本接收来自GAE数据存储side.However DATAS，我得到错误：500内部服务器错误的消息，我无法找到有关我把我的客户端和服务器端的codeS这里的任何解决方案;
服务器端
@燮pressWarnings（串行）
公共类ReceiveLoc延伸的HttpServlet {
公共静态最后弦乐USER_ID =用户id;
公共静态最后弦乐USER_LATITUDE =纬度;
公共静态最后弦乐USER_LONGITUDE =经度;
@覆盖
保护无效的doPost（HttpServletRequest的REQ，HttpServletResponse的RESP）
抛出了ServletException，IOException异常{
// TODO自动生成方法存根
字符串USER_ID = req.getParameter（USER_ID）;
resp.setContentType（应用/ JSON）;
PrintWriter的OUT = resp.getWriter（）;
通过out.println（receiveLoc（USER_ID））;
了out.flush（）;
}
私人字符串receiveLoc（字符串USER_ID）{
// TODO自动生成方法存根
ArrayList的＆LT;地点＆gt;位置=新的ArrayList＆LT; ReceiveLoc.Location＆GT;（）;
DatastoreService数据存储= DatastoreServiceFactory.getDatastoreService（）;
过滤filterId =新的过滤器predicate（USER_ID，Query.FilterOperator.EQUAL，USER_ID）;
查询Q =新的查询（UserLoc）;
q.setFilter（filterId）; preparedQuery PQ =数据存储prepare（Q）。 为（实体结果：pq.asIterable（））{
双纬度=（双）result.getProperty（USER_LATITUDE）;
双经度=（双）result.getProperty（USER_LONGITUDE）;
locations.add（Location.newInstance（纬度，经度））;
}
类型type =新TypeToken＆LT; ArrayList的＆LT;地点＆gt;＆GT;（）{} .getType（）;
GSON GSON =新GSON（）;
JSON字符串= gson.toJson（位置，类型）;
返回JSON;
}静态类位置{
双纬度;
双经度; 公共场所（双纬度，经度双）{
this.latitude =纬度;
this.longitude =经度;
}
公共双getLatitude（）{
返回纬度;
}
公共双getLongitude（）{
返回经度;
}
公共静态的newInstance位置（双纬度，经度双）{
返回新的位置（经度，纬度）;
}
}
}
客户端
类ClientAsyncReceiveLoc扩展的AsyncTask＆LT;弦乐，太虚，字符串＆GT; {
//这个AsyncTask的类，因为该类创建从ClientAsync类不同，
//位置（双）值进行处理。
活动活动;
//构造函数。
公共ClientAsyncReceiveLoc（活动活动）{
this.activity =活动;
} @覆盖
保护字符串doInBackground（字符串... user_ID的）{
HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httpPost =新HttpPost（https://application-id.appspot.com/+ MainActivity.OPERATION_RECEIVE_LOC）;
清单＆LT;＆的NameValuePair GT; namevaluepairs中=新的ArrayList＆LT;＆GT;（1）;
nameValuePairs.add（新BasicNameValuePair（User.USER_ID，USER_ID [0]））; 尝试{
httpPost.setEntity（新UrlEn codedFormEntity（namevaluepairs中））;
HTT presponse响应= httpClient.execute（httpPost）;
Log.i（连接响应code，将String.valueOf（response.getStatusLine（）的getStatus code（）））;
如果（response.getStatusLine（）的getStatus code（）== 200）{
HttpEntity实体= response.getEntity（）;
返回EntityUtils.toString（实体）;
}
回归错误：+响应
.getStatusLine（）
.getStatus code（）++响应
。.getStatusLine（）getReasonPhrase（）;
}赶上（MalformedURLException的E）{
返回e.getMessage（）;
}赶上（UnsupportedEncodingException五）{
返回e.getMessage（）;
}赶上（IOException异常五）{
返回e.getMessage（）;
}
}
@覆盖
保护无效onPostExecute（字符串jsonResponse）{
//super.onPostExecute(s）;
Log.i（RECEIVED，jsonResponse）;
}
}
解决方案虽然我加入到GSON外部库到我的项目，我只是做了一步即 RightClickProject>构建路径>配置构建路径（库选项卡） - >添加外部JAR 的步骤，我忘了这些指令的将其放置在战争/ WEB-INF / lib下的谷歌Web项目的文件夹这就是为什么，当我想收到的感谢DATAS从GSON服务器端项目中，我得到了 500内部服务器错误作为响应消息。根据这一点，我建议大家谁得到这些问题，要小心而增加任何外部库到您的项目。
链接这是帮助我解决问题的链接。
I am working on Google App Engine to store data.My application is a android application and I want to receive datas from GAE datastore side.However when I want to receive ArrayList as a JSON text , I am getting "Error : 500 Internal Server Error" message and I could not find any solution about that I put my client and server side codes here ;
Server Side
@SuppressWarnings("serial") public class ReceiveLoc extends HttpServlet{ public static final String USER_ID = "userId"; public static final String USER_LATITUDE = "latitude"; public static final String USER_LONGITUDE = "longitude"; @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub String user_id = req.getParameter(USER_ID); resp.setContentType("application/json"); PrintWriter out = resp.getWriter(); out.println(receiveLoc(user_id)); out.flush(); } private String receiveLoc(String user_id) { // TODO Auto-generated method stub ArrayList<Location> locations = new ArrayList<ReceiveLoc.Location>(); DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(); Filter filterId = new FilterPredicate(USER_ID, Query.FilterOperator.EQUAL,user_id); Query q = new Query("UserLoc"); q.setFilter(filterId); PreparedQuery pq = datastore.prepare(q); for(Entity result: pq.asIterable()){ double latitude = (double) result.getProperty(USER_LATITUDE); double longitude = (double) result.getProperty(USER_LONGITUDE); locations.add(Location.newInstance(latitude, longitude)); } Type type = new TypeToken<ArrayList<Location>>() {}.getType(); Gson gson = new Gson(); String json = gson.toJson(locations,type); return json; }static class Location { double latitude; double longitude; public Location(double latitude,double longitude){ this.latitude = latitude; this.longitude = longitude; } public double getLatitude() { return latitude; } public double getLongitude() { return longitude; } public static Location newInstance(double latitude,double longitude){ return new Location(latitude, longitude); } } }
Client Side
class ClientAsyncReceiveLoc extends AsyncTask<String,Void,String> { //This ASYNCTASK class created different from ClientAsync class because in that class, //locations(double) values are processed. Activity activity; //constructor. public ClientAsyncReceiveLoc(Activity activity) { this.activity = activity; } @Override protected String doInBackground(String... user_id) { HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost("https://application-id.appspot.com/" + MainActivity.OPERATION_RECEIVE_LOC); List<NameValuePair> nameValuePairs = new ArrayList<>(1); nameValuePairs.add(new BasicNameValuePair(User.USER_ID, user_id[0])); try { httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = httpClient.execute(httpPost); Log.i("Connection Response Code",String.valueOf(response.getStatusLine().getStatusCode())); if (response.getStatusLine().getStatusCode() == 200) { HttpEntity entity = response.getEntity(); return EntityUtils.toString(entity); } return "Error : " + response .getStatusLine() .getStatusCode() + " " + response .getStatusLine().getReasonPhrase(); } catch (MalformedURLException e) { return e.getMessage(); } catch (UnsupportedEncodingException e) { return e.getMessage(); } catch (IOException e) { return e.getMessage(); } } @Override protected void onPostExecute(String jsonResponse) { //super.onPostExecute(s); Log.i("RECEIVED",jsonResponse); } }
解决方案While I am adding to GSON external library to my project , I just did step which is RightClickProject>Build Path>Configure Build Path(Libraries Tab)->Add External JARs steps and I forgot these instructions place it in the war/WEB-INF/lib folder of your google web project that's why , when I want to receive datas thanks to gson from serverside project , I got the 500 Internal Server Error as a response message. According to this, I suggest everybody who got these problem , be careful while adding any external library to your project.
Link which is help to me to solve problem is LINK .
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