正文中的 Android Volley POST 字符串
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Android Volley POST string in body
提问by Sandak
I'm trying to use Volley library to communicate with my RESTful API.
我正在尝试使用 Volley 库与我的 RESTful API 进行通信。
I have to POST string in the body, when I'm asking for the bearer Token. String should look like this: grant_type=password&username=Alice&password=password123 And header: Content-Type: application/x-www-form-urlencoded
当我要求不记名令牌时，我必须在正文中 POST 字符串。字符串应如下所示：grant_type=password&username=Alice&password=password123 和标题：Content-Type: application/x-www-form-urlencoded
More info about WebApi Individual Accounts: http://www.asp.net/web-api/overview/security/individual-accounts-in-web-api
有关 WebApi 个人帐户的更多信息：http: //www.asp.net/web-api/overview/security/individual-accounts-in-web-api
Unfortunately I can't figure out how can I solve it..
不幸的是，我不知道如何解决它..
I'm trying something like this:
我正在尝试这样的事情：
StringRequest req = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
VolleyLog.v("Response:%n %s", response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.e("Error: ", error.getMessage());
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("grant_type", "password");
params.put("username", "User0");
params.put("password", "Password0");
return params;
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
headers.put("Content-Type", "application/x-www-form-urlencoded");
return headers;
}
};
I'm getting 400 Bad Request all the time. I think that I'm actually sending request like this:
我一直收到 400 个错误的请求。我认为我实际上是在发送这样的请求：
grant_type:password, username:User0, password:Password0
instead of:
代替：
grant_type=password&username=Alice&password=password123
I would be very grateful if anyone has any ideas or an advice..
如果有人有任何想法或建议，我将不胜感激。
采纳答案by Itai Hanski
First thing, I advise you to see exactly what you're sending by either printing to the log or using a network sniffer like wireshark or fiddler.
首先，我建议您通过打印到日志或使用诸如wireshark 或fiddler 之类的网络嗅探器来准确查看您发送的内容。
How about trying to put the params in the body? If you still want a StringRequestyou'll need to extend it and override the getBody()method (similarly to JsonObjectRequest)
尝试将参数放入体内怎么样？如果您仍然想要 a StringRequest，则需要扩展它并覆盖该getBody()方法（类似于JsonObjectRequest）
回答by georgiecasey
To send a normal POST request (no JSON) with parameters like username and password, you'd usually override getParams()and pass a Map of parameters:
要发送带有用户名和密码等参数的普通 POST 请求（无 JSON），您通常会覆盖getParams()并传递参数映射：
public void HttpPOSTRequestWithParameters() {
RequestQueue queue = Volley.newRequestQueue(this);
String url = "http://www.somewebsite.com/login.asp";
StringRequest postRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
Log.d("ERROR","error => "+error.toString());
}
}
) {
// this is the relevant method
@Override
protected Map<String, String> getParams()
{
Map<String, String> params = new HashMap<String, String>();
params.put("grant_type", "password");
// volley will escape this for you
params.put("randomFieldFilledWithAwkwardCharacters", "{{%stuffToBe Escaped/");
params.put("username", "Alice");
params.put("password", "password123");
return params;
}
};
queue.add(postRequest);
}
And to send an arbitary string as POST body data in a Volley StringRequest, you override getBody()
并且要在 Volley StringRequest中将任意字符串作为 POST 正文数据发送，您可以覆盖getBody()
public void HttpPOSTRequestWithArbitaryStringBody() {
RequestQueue queue = Volley.newRequestQueue(this);
String url = "http://www.somewebsite.com/login.asp";
StringRequest postRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
Log.d("ERROR","error => "+error.toString());
}
}
) {
// this is the relevant method
@Override
public byte[] getBody() throws AuthFailureError {
String httpPostBody="grant_type=password&username=Alice&password=password123";
// usually you'd have a field with some values you'd want to escape, you need to do it yourself if overriding getBody. here's how you do it
try {
httpPostBody=httpPostBody+"&randomFieldFilledWithAwkwardCharacters="+URLEncoder.encode("{{%stuffToBe Escaped/","UTF-8");
} catch (UnsupportedEncodingException exception) {
Log.e("ERROR", "exception", exception);
// return null and don't pass any POST string if you encounter encoding error
return null;
}
return httpPostBody.getBytes();
}
};
queue.add(postRequest);
}
As an aside, Volley documentation is non-existent and quality of StackOverflow answers is pretty bad. Can't believe an answer with an example like this wasn't here already.
顺便说一句，Volley 文档不存在，并且 StackOverflow 答案的质量非常糟糕。无法相信像这样的例子的答案已经不存在了。
回答by Ryan Newsom
I know this is old, but I ran into this same problem and there is a much cleaner solution imo found here: How to send a POST request using volley with string body?
我知道这是旧的，但我遇到了同样的问题，在这里找到了一个更清晰的解决方案：How to send a POST request using volley with string body?
