Android Volley似乎没有发布HTTP参数 [英] Android Volley does not seem to post HTTP parameters

问题描述

我已经在StackOverflow上看到了一些这样的问题，但是我似乎无法弄清楚为什么这段代码对我不起作用.

I've seen a few of these questions on StackOverflow but I can't seem to work out why this code is not working for me.

public void postMethod(final String msg) {

    String url = "http://192.168.1.30/endpoint";

    RequestQueue queue = Volley.newRequestQueue(this);
    StringRequest sr = new StringRequest(Request.Method.POST, url, 
        new Response.Listener<String>() {

        @Override
        public void onResponse(String response) {
            // Handle response...
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            // Handle error...
        }
    }){
        @Override
        protected Map<String,String> getParams(){
            Map<String,String> params = new HashMap<String, String>();
            params.put("msg", msg);

            return params;
        }

        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String,String> params = new HashMap<String, String>();
            params.put("Content-Type","application/x-www-form-urlencoded");
            return params;
        }
    };
    queue.add(sr);
}

我正在尝试对运行python flask应用程序的服务器进行POST.如果我使用程序发出HTTP Post请求，则我的服务器应用程序可以正常运行.如果我使用AsyncTask并执行Volley试图为我做的事情，它也将正常工作.

I'm trying to make a POST to my server which is running a python flask application. If I use a program to make HTTP Post requests my server application works fine. It will also work fine if I use an AsyncTask and do what Volley is trying to do for me.

从所有示例中，我已经看到此代码应该可以正常工作，但是我的flask服务器从不接收任何POST参数.任何想法可能会发生什么?

From all of the examples I have seen this code should work fine but my flask server never receives any of the POST parameters. Any ideas what might be happening?

编辑

服务器代码:

from flask import Flask, request, abort
app = Flask(__name__)

@app.route('/endpoint', methods=['POST'])
def echo_msg():
    if request.method == 'POST':
        try:
            msg = request.form['msg']
            return msg

        except KeyError, e:
            # A required parameter is missing.
            abort(400)

推荐答案

您需要重写getBodyContentType()并返回"application/x-www-form-urlencoded; charset = UTF-8"；

You need to override getBodyContentType() and return "application/x-www-form-urlencoded; charset=UTF-8";

StringRequest jsonObjRequest = new StringRequest(Request.Method.POST,
            getResources().getString(R.string.base_url),
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {

                    MyFunctions.toastShort(LoginActivity.this, response);
                }
            }, new Response.ErrorListener() {

                @Override
                public void onErrorResponse(VolleyError error) {
                    VolleyLog.d("volley", "Error: " + error.getMessage());
                    error.printStackTrace();
                    MyFunctions.croutonAlert(LoginActivity.this,
                            MyFunctions.parseVolleyError(error));
                    loading.setVisibility(View.GONE);
                }
            }) {

        @Override
        public String getBodyContentType() {
            return "application/x-www-form-urlencoded; charset=UTF-8";
        }

        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<String, String>();
            params.put("username", etUname.getText().toString().trim());
            params.put("password", etPass.getText().toString().trim());
            return params;
        }

    };

    AppController.getInstance().addToRequestQueue(jsonObjRequest);

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