//service.js
authApp.factory("loginFactory", function ($http) {
    return{
        login: function(username, password) {
            var data = "username="+username+"&password="+password+"&submit=Login";
            return $http({
                method: 'POST',
                url: 'http://localhost:8080/login',
                data: data,
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded',
                }
            });
        }
    }
});

//controller
authApp.controller('LoginCtrl', ['$scope', '$location', 'loginFactory', function($scope, $location, loginFactory){
    $scope.authenticate = function() {
        loginFactory.login($scope.username, $scope.password)
        .then(function(response) {
            console.log(response.statusText);
        }, function errorCallBack(response) {
            console.log(response.statusText);
        });
    }
}]);

<div ng-controller="LoginCtrl">
            <h2>Login</h2>
            <form name="form" ng-submit="authenticate()">
                <div>
                <label for="username">Username</label>
                <input type="text" name="username" id="username" ng-model="username"/>

                <label for="password">Password</label>
                <input type="password" name="password" id="password" ng-model="password"/>
                <button type="submit">Login</button>
            </form>
        </div>