Hello All,
I have been trying to save the user list in the basic example module into a json file but I always find the file empty.
Any help would be appreciated. Thanks !
/**
- This Source Code Form is subject to the terms of the Mozilla Public License,
- v. 2.0. If a copy of the MPL was not distributed with this file, You can
- obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
- the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
- Copyright © OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
- graphic logo is a trademark of OpenMRS Inc. */ package org.openmrs.module.gson.web.controller;
import java.util.List; import javax.servlet.http.HttpSession; import com.fasterxml.jackson.databind.ObjectMapper; import java.io.File; import java.io.IOException;
import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.openmrs.User; import org.openmrs.api.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.validation.BindingResult; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod;
/**
-
This class configured as controller using annotation and mapped with the URL of
-
‘module/gson/gsonLink.form’. */ @Controller("${rootrootArtifactId}.GsonController") @RequestMapping(value = “module/gson/gson.form”) public class GsonController {
/** Logger for this class and subclasses */ protected final Log log = LogFactory.getLog(getClass());
@Autowired UserService userService;
/** Success form view name */ private final String VIEW = “/module/gson/gson”;
/**
- Initially called after the getUsers method to get the landing form name
- @return String form view name */ @RequestMapping(method = RequestMethod.GET) public String onGet() { return VIEW; }
/**
-
All the parameters are optional based on the necessity
-
@param httpSession
-
@param anyRequestObject
-
@param errors
-
@return */ @RequestMapping(method = RequestMethod.POST) public String onPost(HttpSession httpSession, @ModelAttribute(“anyRequestObject”) Object anyRequestObject, BindingResult errors) {
if (errors.hasErrors()) { // return error view }
return VIEW; }
/**
- This class returns the form backing object. This can be a string, a boolean, or a normal java
- pojo. The bean name defined in the ModelAttribute annotation and the type can be just defined
- by the return type of this method */
@ModelAttribute(“users”) protected List getUsers() throws Exception { List users = userService.getAllUsers();
ObjectMapper mapper = new ObjectMapper(); File file = new File("users.json"); try { // Serialize Java object into JSON file. mapper.writeValue(file, users); } catch (IOException e) { e.printStackTrace(); } return users; // this object will be made available to the jsp page under the variable name // that is defined in the @ModuleAttribute tag} }