i have some problems with angularJS and REST requests / responses. Since three weeks i playing with AngularJS and now i would like do some cool stuff. First i created a simple jersey REST service, that returns a simple list.
@Path("/hello")
public class Hello {
@GET
@Produces(MediaType.APPLICATION_JSON)
public List<Medication> sayJsonHello() {
List<Object1> objs = new ArrayList<Object1>();
objs.add(new Object1("1", "HUHU"));
objs.add(new Object1("2", "HUHU 2"));
return objs;
}
}
as you can see, there is no big magic. Here my web.xml file, to configure Jersey:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>Jersey REST Example</display-name>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>examples</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.config.feature.DisableWADL</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
After some tests, the service will return a simple JSON list:
[
{
"id": "1",
"name": "HUHU"
},
{
"id": "2",
"name": "HUHU 2"
}
]
I deploying the webservice into a Tomcat7 instance. Now i would like to get this data into my webapplication. After reading some tutorials and example i starting to create few implementations.
After starting create my first service, i and this code-snipped into my app.js:
app.config(['$httpProvider', function ($httpProvider) {
delete $httpProvider.defaults.headers.common["X-Requested-With"];
}]);
this will remove X-Request-With request-header from the header defauls.
1. Request via Service and ngResource
angular.module('helloService', ['ngResource']).
factory('hService', function ($resource) {
return $resource('http://localhost\\:8180/rest/hello',
{callback: 'JSON_CALLBACK'}, {
get: {method: 'GET', headers: [
{'Content-Type': 'application/json'},
{'Accept': 'application/json'}
]}
});
});
MyController:
function MyController($scope, hService) {
hService.get(function(result){
alert(" Result of helloService");
}, function error(response){
alert(" Error during helloService "+response.status);
});
}
if i try to load data, the get functin will always return an error and the status is always 0.
2. Trying with Restangular
After get how to use Restangular i starting to configured Restangular:
app.config(function (RestangularProvider) {
RestangularProvider.setBaseUrl('http://localhost\\:8180/rest');
});
and also add the RestangularProvider to my angular.module:
var app = angular.module("html5App", ['helloService', 'restangular', 'ngResource']);
MyController:
function MyRestangularCtr($scope, Restangular){
var all = Restangular.all('hello');
$scope.allObjects = all.getList();
all.getList().then(function (hellos) {
console.log("Result "+ hellos);
}, function errorCallback(response) {
alert("Oops error from server :( status" + response.status);
console.log("status: "+response);
});
}
Here the same: No Data, Status 0. I have no idea, why i dont get any data from my service. Additional i getting sometimes this error: "Error: $digest already in progress". Im not sure, where the problem is. If the jersey service i wrong or bad or my beginner JavaScript is wrong.
First Solution
Client Side
The Angular request should look like this:
$scope.myData = $resource('http://localhost\\:8180/rest/:action',
{action: 'hello', callback:'JSON_CALLBACK'},
{get: {method: 'JSONP'}});
$scope.datas = $scope.myData.get();
The method need to JSONP (GET will still not working ( no repsonse data because CORPS?)
Service Side
Important here is, that the server also response with a JSONP fomat and can handle callback requests.
@GET
@Produces("application/x-javascript")
public JSONWithPadding sayJsonHello(@QueryParam("callback") String callback) {
MyObjectList obList= new MyObjectList ();
obList.getObjs().add(new MyObject(1, "HUHU"));
obList.getObjs().add(new MyObject(2, "HUHU 2"));
return new JSONWithPadding(obList, callback);
}
Still unclear
Is there any way to return normal json object from server to client?
