AngularJS http POST到Servlet [英] AngularJS http POST to Servlet
问题描述
我经历了很多StackOverflow的答案并且搜索了很多但仍然无法找到我的帖子请求无效的原因。
I went through a lot of StackOverflow answers and googled a lot but still could not find why my post request is not working.
这是我的jsp:
<div class="container">
<form class="form-signin" ng-controller="MyController">
<h2 class="form-signin-heading">Please sign in</h2>
<label for="username" class="sr-only">Username</label>
<input type="text" id="username" ng-model="user.name" class="form-control" placeholder="Username" required autofocus>
<label for="password" class="sr-only">Password</label>
<input type="password" ng-model="user.password" id="password" class="form-control" placeholder="Password" required>
<button class="btn btn-lg btn-primary btn-block" ng-click="login()" type="submit">Sign in</button>
</form>
</div>
这是我的控制器:
app.controller('MyController', function($scope, $http) {
$scope.login = function() {
console.log($scope.user);
$http({
method : 'POST',
url : 'login',
data : $scope.user,
headers: {
'Content-Type': 'application/json'
}
}).success(function(data) {
console.log(data);
}).error(function(data) {
console.log(data);
});
console.log("POST done");
};
});
我的servlet:
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("inside do POST");
Gson gson = new Gson();
JsonParser parser = new JsonParser();
JsonObject obj = (JsonObject) parser
.parse(request.getParameter("data"));
Iterator it = (Iterator) obj.entrySet();
while (it.hasNext()) {
System.out.println(it.next());
}
System.out.println("over");
}
我一直得到这个Null指针异常
I keep getting this Null pointer exception
java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:50)
at com.google.gson.JsonParser.parse(JsonParser.java:45)
at com.zookeeperUI.controller.Login.doPost(Login.java:40)
请告诉我这里我做错了什么。
Please tell me what am I doing wrong here .
推荐答案
您的要求不包含名为data的URL参数,因此request.getParameter(data)返回null并且您获得NullPointerException。
Your request does not contain a URL parameter named "data", therefore request.getParameter("data") returns null and you get the NullPointerException.
您尝试发送Javascript对象通过URL参数,这些参数与非浅层对象不相符。
You try to send a Javascript object via URL parameters which does not go well with non-shallow objects.
我建议将数据作为请求有效载荷发送:
I would recommend to send the data as request payload:
JsonObject obj = (JsonObject) parser.parse(request.getReader());
在客户端,您需要确保将数据作为正确的JSON发送:
On the client you need to make sure that your data is sent as proper JSON:
$http({
method : 'POST',
url : 'login',
contentType: 'application/json',
data : JSON.stringify($scope.user),
})...
这篇关于AngularJS http POST到Servlet的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!