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问题描述

我正在制作一个Android应用,该应用需要将Post请求发送到我的服务器,并且确实可以使用一些帮助!我一直在尝试使用Android Volley发出这些请求.我在这里已经阅读了许多相关的问题,以及有关android Volley的各种文档资料,但是由于我设法提出请求,因此我不可能在服务器端以正确的方式接收发布的数据,因此我一无所知我做错了什么...我尝试使用 stringRequest 覆盖 getParams()和自定义 JsonObjectRequest ,并将数据作为参数.我在两个请求的服务器端都得到了不同的结果,但是仍然无法以正确的方式捕获它.

I am making an android app that needs to send Post requests to my server and could really use some help!I've been trying to make these requests using android Volley. I've read a lot of related questions here and all kind of documenttion sources about android Volley but as I manage to make my requests, it's been impossible for me to receive the posted data the right way on server side and I have no clue about what I'm doing wrong...I've tried with stringRequest overriding getParams() and custom JsonObjectRequest with my data as a parameter. I get diferent results on server side with both requests but I'm still not able to catch it the right way.

在服务器端,我的调试 PHP文件如下所示:

On my server side my debug PHP file goes like this:

$content = file_get_contents("php://input");
$string = 'fileGetContents: ';
$json = json_decode($content, TRUE);
$string = 'fileGetContents: ';
$string .= $content;
$string .= ' -- json encoded: ';
$string .= json_encode($json);
$string .= ' -- Request Method: ';
$string .= $_SERVER['REQUEST_METHOD'];
$string .= ' -- $_REQUEST: ';
$string .= json_encode($_REQUEST);
$string .= ' -- $_POST: ';
$string .= json_encode($_POST);
$string .= ' -- user: ';
$string .= json_encode($_POST["user"]);
$string .= ' -- $_GET: ';
$string .= json_encode($_GET);
$string .= ' -- $_FORM: ';
$string .= json_encode($_FORM);
$array["ans"] = $string;
echo json_encode($array);

由于收到的响应始终为空,因此我也尝试将请求发送到 http://httpbin.org/post ,它为我提供了有趣的信息.

and as the response I get is always empty I've also tried sending my requests to http://httpbin.org/post which gives me interesting information.

因此,我将第一个 stringRequest 设置为:

So with the first stringRequest that I make like this:

    RequestQueue requestQueue = Volley.newRequestQueue(this);
    StringRequest stringRequest = new StringRequest(Request.Method.POST, "myServer.com/postRequest.php",
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    displayTheResponse(response);
                 }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(RegisterActivity.this,error.toString(),Toast.LENGTH_LONG).show();
                }
            }){
        @Override
        protected Map<String,String> getParams(){
            Map<String,String> params = new HashMap<String, String>();
            params.put("user", "test");
            params.put("pass", "passtest");
            return params;
        }

    };
    requestQueue.add(stringRequest);

我从服务器上得到了这个答案:

I get this answer from my server:

{"ans":"fileGetContents:  -- json encoded: null -- Request Method: GET -- $_REQUEST: [] -- $_POST: [] -- user: null -- $_GET: []"}

从httpbin.org我得到:

And from httpbin.org i get:

{   "args": {},
    "data": "",
    "files": {},
    "form": {     "pass": "passtest",      "user": "test"   },
    "headers": {     "Accept-Encoding": "gzip",      "Content-Length": "24",      "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",      "Host": "httpbin.org",      "User-Agent": "Dalvik/2.1.0 (Linux; U; Android 7.1; Android SDK built for x86 Build/NPF26K)"   },
    "json": null,
    "origin": "104.221.22.144",
    "url": "http://httpbin.org/post"
}

我可以看到信息实际上是发送的,但不是作为POST数据接收的,而是作为Form数据接收的,我实际上并不知道它是什么或如何从PHP接收它...

I can see that the information is actually sent but not received as POST data but as Form data which I don't really know what it is or how to receive it from PHP...

然后在我的第二个 JsonObjectRequest 中,如下所示:

Then in my second JsonObjectRequest that goes like this:

    Map<String, String> jsonParams = new HashMap<String, String>();
    jsonParams.put("user", "test");

    JsonObjectRequest myRequest = new JsonObjectRequest(
            Request.Method.POST,
            "myServer.com/postTest.php",
            new JSONObject(jsonParams),
            new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            try {
                displayResponse(response.toString(4));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        },
            new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(LogInActivity.this, "Error "+error.getMessage(), Toast.LENGTH_LONG).show();
            fm.popBackStack();
        }
    });
    requestQueue.add(myRequest);

从httpbin.org我得到:

From httpbin.org I get:

{     "args": {},
     "data": "{\"user\":\"test\"}",
     "files": {},
     "form": {},
     "headers": {         "Accept-Encoding": "gzip",         "Content-Length": "15",         "Content-Type": "application\/json; charset=utf-8",         "Host": "httpbin.org",         "User-Agent": "Dalvik\/2.1.0 (Linux; U; Android 7.1; Android SDK built for x86 Build\/NPF26K)"     },
     "json": {         "user": "test"     },
     "origin": "104.221.22.144",
     "url": "http:\/\/httpbin.org\/post"
}

在这里我们看到数据现在显示在数据"和"json"中,而不是在窗体"中,但是从我的服务器上我仍然得到相同的空响应,所以我认为我的问题来自服务器端PHP代码我正在使用.我还注意到"$ _SERVER ['REQUEST_METHOD']"返回"GET".

and here we see that now the data is shown in "data" and "json" instead of in "form" but from my server I still get the same empty response so I gess my problem comes from the server side PHP code I'm using. I also note that "$_SERVER['REQUEST_METHOD']" is returning "GET".

我已经尝试了许多不同的方式来提出我的Volley请求,但是我不知道该怎么办.我尝试创建一个帮助器类,自定义JsonObjectRequest,重写getHeaders(),甚至使用AppController将请求添加到队列中……我想我对Post请求的工作方式还没有足够的了解,我是一个很新的人android develloping.

I've tried a lot of diferent ways to make my Volley request but I don't know what else to do. I've tried creating a helper class, custom JsonObjectRequest, overriding getHeaders(), even adding the request to the queue with the AppController... I guess I don't have enough understanding onhow the Post requests work, I'm pretty new with android develloping.

如果能帮助我了解如何使用Volley POST方法在服务器端接收数据,我将非常感激.非常感谢您的宝贵时间!

I would really be so grateful for any help to understand how am I supposed to receive my data on server side with the Volley POST method. Thank you very much for your time!

推荐答案

以下是可用于通过android中的 Volley库发出 POST 请求的代码.假设您将库这样导入您的应用程序build.gradle文件中:

Here is code you can use to make a POST request with the Volley library in android. Assuming you import your library as such in your application build.gradle file:

dependencies{
     ....
     implementation 'com.android.volley:volley:1.1.0'
     .....
 }

下面的代码可以作为执行您的POST请求的一些常规任务放在方法中

The following code can be put in a method as some routine task to perform your POST request

String requestUrl = "http://myapi.com/api/postresource.php";
StringRequest stringRequest = new StringRequest(Request.Method.POST, requestUrl, new Response.Listener<String>() {
    @Override
    public void onResponse(String response) {
        Log.e("Volley Result", ""+response); //the response contains the result from the server, a json string or any other object returned by your server

    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        error.printStackTrace(); //log the error resulting from the request for diagnosis/debugging

    }
}){

    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        Map<String, String> postMap = new HashMap<>();
        postMap.put("param1", "value1");
        postMap.put("param2", value2);
        //..... Add as many key value pairs in the map as necessary for your request
        return postMap;
    }
};
//make the request to your server as indicated in your request url
Volley.newRequestQueue(getContext()).add(stringRequest);

这篇关于Android Volley POST请求:在服务器端获取GET请求方法(php)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!

09-01 17:24
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