Exposing data from spring, hibernate application as restful - json

Question

The work has been derived from this link
http://www.javacodegeeks.com/2013/04/spring-mvc-hibernate-maven-crud-operations-example.html. I have tried made an attempt of releasing the data of the application in a json format for which I have made further modifications in controller class
#Controller
#RequestMapping(value="/team")
public class TeamController {
#Autowired
private TeamService teamService;
#RequestMapping(value="/add", method=RequestMethod.GET)
public ModelAndView addTeamPage() {
ModelAndView modelAndView = new ModelAndView("add-team-form");
modelAndView.addObject("team", new Team());
return modelAndView;
}
#RequestMapping(value="/add", method=RequestMethod.POST)
public ModelAndView addingTeam(#ModelAttribute Team team) {
ModelAndView modelAndView = new ModelAndView("home");
teamService.addTeam(team);
String message = "Team was successfully added.";
modelAndView.addObject("message", message);
return modelAndView;
}
#RequestMapping(value="/list")
public ModelAndView listOfTeams() {
ModelAndView modelAndView = new ModelAndView("list-of-teams");
List<Team> teams = teamService.getTeams();
modelAndView.addObject("teams", teams);
return modelAndView;
}
#RequestMapping(value="/edit/{id}", method=RequestMethod.GET)
public ModelAndView editTeamPage(#PathVariable Integer id) {
ModelAndView modelAndView = new ModelAndView("edit-team-form");
Team team = teamService.getTeam(id);
modelAndView.addObject("team",team);
return modelAndView;
}
#RequestMapping(value="/edit/{id}", method=RequestMethod.POST)
public ModelAndView edditingTeam(#ModelAttribute Team team, #PathVariable Integer id) {
ModelAndView modelAndView = new ModelAndView("home");
teamService.updateTeam(team);
String message = "Team was successfully edited.";
modelAndView.addObject("message", message);
return modelAndView;
}
#RequestMapping(value="/delete/{id}", method=RequestMethod.GET)
public ModelAndView deleteTeam(#PathVariable Integer id) {
ModelAndView modelAndView = new ModelAndView("home");
teamService.deleteTeam(id);
String message = "Team was successfully deleted.";
modelAndView.addObject("message", message);
return modelAndView;
}
#RequestMapping(value = "/api/team", method = RequestMethod.GET)
// public #ResponseBody String listUsersJson (ModelMap model) throws JSONException {
public #ResponseBody
String listTeamJson () throws JSONException {
JSONArray userArray = new JSONArray();
for (Team team : teamService.getTeams()) {
JSONObject userJSON = new JSONObject();
userJSON.put("id", team.getId());
userJSON.put("Name", team.getName());
userJSON.put("Rating", team.getRating());
userArray.put(userJSON);
}
return userArray.toString();
}
}
But This code is showing error 404. How can I implement my application in order to release the data in json format?

Answer 1

Change your JSON code to following:
#RequestMapping(value = "/api/team", method = RequestMethod.GET)
public #ResponseBody List<TEAMS_OBJECT_TYPE>listTeamJson () throws JSONException {
return teamService.getTeams();
}
}
NOTE: TEAMS_OBJECT_TYPE needs to be replaced by the type that teamService.getTeams() returns.
#ResponseBody will automatically convert it into JSON, so all you need to do is read it properly on client side.