package firstREST;
import org.restlet.Application;
import org.restlet.Component;
import org.restlet.Restlet;
import org.restlet.data.Protocol;
import org.restlet.routing.Router;
public class Faculty extends Application {
public static void main(String[] args) {
Component comp = new Component();
comp.getServers().add(Protocol.HTTP, 8080);
Application app = new Faculty();
comp.getDefaultHost().attach(app);
try {
comp.start();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public Restlet createInboundRoot() {
Router router = new Router(getContext());
router.attach("/attendance/faculty/select", Faculty_Get.class);
router.attach("/attendance/faculty/insert", Faculty_Insert.class);
return router;
}
}
приведенный выше код не работает. после запуска сервера, когда я открываю URL-адрес http://localhost:8080/attendance/faculty/select
, он не будет работать. Как я могу сделать эту работу? любой может помочь?Использование маршрутизатора в Rest API - java
Faculty_Get Класс:
package firstREST;
import org.restlet.resource.Get;
import org.restlet.resource.ServerResource;
import org.json.JSONArray;
import org.json.JSONObject;
import java.sql.*;
public class Faculty_Get extends ServerResource {
@Get ("json")
public String present(String name) throws Exception {
// Values.
String getName = null;
String getPost = null;
String getCourse = null;
String getDepartment = null;
String getPresents = null;
String getAbsents = null;
// Get values.
String jSonString = getQuery().getValues("data");
// Decode jSon.
JSONArray mJsonArray = new JSONArray(jSonString);
JSONObject mJsonObject = new JSONObject();
for (int i = 0; i < mJsonArray.length(); i++) {
mJsonObject = mJsonArray.getJSONObject(i);
getName = mJsonObject.getString("name");
}
// Database.
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection myconn = DriverManager.getConnection("jdbc:mysql://localhost:3306/attendance", "root", "");
PreparedStatement ps = myconn.prepareStatement("SELECT * FROM faculty where name = '" + getName + "'");
ResultSet rs = ps.executeQuery();
while(rs.next())
{
getName = rs.getString("name");
getPost = rs.getString("post");
getCourse = rs.getString("course");
getDepartment = rs.getString("department");
getPresents = rs.getString("presents");
getAbsents = rs.getString("absents");
}
return "name="+getName+"&post="+getPost+"&course="+getCourse+"&department="+getDepartment+"&presents="+getPresents+"&absents="+getAbsents;
}
catch(Exception e)
{
throw e;
}
}
}
Ошибка:
May 18, 2015 6:17:10 PM org.restlet.resource.UniformResource doCatch
WARNING: Exception or error caught in resource
java.lang.NullPointerException
at java.io.StringReader.<init>(Unknown Source)
at org.json.JSONTokener.<init>(JSONTokener.java:83)
at org.json.JSONArray.<init>(JSONArray.java:145)
at firstREST.Faculty_Get.present(Faculty_Get.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.restlet.resource.ServerResource.doHandle(ServerResource.java:449)
at org.restlet.resource.ServerResource.get(ServerResource.java:648)
at org.restlet.resource.ServerResource.doHandle(ServerResource.java:530)
at org.restlet.resource.ServerResource.doNegotiatedHandle(ServerResource.java:590)
at org.restlet.resource.ServerResource.doConditionalHandle(ServerResource.java:302)
at org.restlet.resource.ServerResource.handle(ServerResource.java:849)
at org.restlet.resource.Finder.handle(Finder.java:513)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Router.doHandle(Router.java:500)
at org.restlet.routing.Router.handle(Router.java:740)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.engine.application.StatusFilter.doHandle(StatusFilter.java:154)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.engine.ChainHelper.handle(ChainHelper.java:114)
at org.restlet.engine.application.ApplicationHelper.handle(ApplicationHelper.java:75)
at org.restlet.Application.handle(Application.java:391)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Router.doHandle(Router.java:500)
at org.restlet.routing.Router.handle(Router.java:740)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Router.doHandle(Router.java:500)
at org.restlet.routing.Router.handle(Router.java:740)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.engine.application.StatusFilter.doHandle(StatusFilter.java:154)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.engine.ChainHelper.handle(ChainHelper.java:114)
at org.restlet.Component.handle(Component.java:391)
at org.restlet.Server.handle(Server.java:491)
at org.restlet.engine.http.connector.BaseServerHelper.handle(BaseServerHelper.java:161)
at org.restlet.engine.http.connector.BaseServerHelper.handleInbound(BaseServerHelper.java:170)
at org.restlet.engine.http.connector.BaseHelper.handleNextInbound(BaseHelper.java:421)
at org.restlet.engine.http.connector.Connection.readMessages(Connection.java:698)
at org.restlet.engine.http.connector.Controller$2.run(Controller.java:98)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
May 18, 2015 6:17:10 PM org.restlet.engine.log.LogFilter afterHandle
INFO: 2015-05-18 18:17:10 127.0.0.1 - - 8080 GET /attendance/faculty/select - 500 486 0 30 http://localhost:8080 Mozilla/5.0 (Windows NT 6.1; rv:40.0) Gecko/20100101 Firefox/40.0 -
Это ошибка, я получаю, когда я обновить свой браузер. Я не знаю, что вызывает эту проблему.
Сообщение всей трассировки стека, и 'Faculty_ *' классы –
@Anders Р. Bystrup я отправил выше –
является 'GetQuery(). GetValues ("данные")' возвращение что-нибудь? – isalgueiro