java Android Volley PUT 请求

Android Volley PUT request

提问by HairyLemon

i'm new to Volley and Android in general. Below is code snippet (Android using Volley) which i'm trying to execute, however it's the server returns a 400. Using another REST Client works perfectly. It's a request to the server using PUT method.

我是 Volley 和 Android 的新手。下面是我正在尝试执行的代码片段（使用 Volley 的 Android），但是服务器返回 400。使用另一个 REST 客户端可以完美运行。这是使用 PUT 方法向服务器发出的请求。

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    sendRequest();
}

private void sendRequest() {
    RequestQueue queue = Volley.newRequestQueue(this);

    final JSONObject jsonObject = new JSONObject();
    try {
        jsonObject.put("password", "ttttt");
        jsonObject.put("username", "tester3");
        jsonObject.put("token", "blah");
    } catch (JSONException e) {
        // handle exception
    }


    JsonObjectRequest putRequest = new JsonObjectRequest(Request.Method.PUT, url, jsonObject,
            new Response.Listener<JSONObject>()
            {
                @Override
                public void onResponse(JSONObject response) {
                    // response
                    Log.d("Response", response.toString());
                }
            },
            new Response.ErrorListener()
            {
                @Override
                public void onErrorResponse(VolleyError error) {
                    // error
                    Log.d("Error.Response", error.toString());
                }
            }
    ) {

        @Override
        public Map<String, String> getHeaders()
        {
            Map<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            headers.put("Accept", "application/json");
            return headers;
        }

        @Override
        public byte[] getBody() {

            try {
                Log.i("json", jsonObject.toString());
                return jsonObject.toString().getBytes("UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            return null;
        }
    };

    queue.add(putRequest);
}

When i execute this code i always get a 400 Bad request back and i can't figure out why. Using another client like Postman, it works as expected. Here is the postman request:

当我执行这段代码时，我总是收到一个 400 Bad 请求，我不知道为什么。使用像 Postman 这样的另一个客户端，它按预期工作。这是邮递员的请求：

Raw Request:
{ "token": "blah", "password": "ttttt", "username": "tester3" }

原始请求：
{“令牌”：“废话”，“密码”：“ttttt”，“用户名”：“tester3”}

Headers: Content-Type: application/json

I can't see anything wrong with the request i'm hoping someone can point out what i'm doing wrong?

我看不出请求有什么问题，我希望有人能指出我做错了什么？

回答by Siddarth G

Sometimes , adding header "Content-Type", "application/json" in getHeaders() will not work its better to also override getBodyContentType() and return the header here.

有时，在 getHeaders() 中添加标头“Content-Type”、“application/json”不会更好地覆盖 getBodyContentType() 并在此处返回标头。

So along with ,

所以随着，

public Map<String, String> getHeaders()
    {
        Map<String, String> headers = new HashMap<String, String>();
        headers.put("Content-Type", "application/json"); 
        return headers;
    }

also add,

还补充说，

    @Override
    public String getBodyContentType() {
        return "application/json";
    }

This worked for me while using POST.

这在使用 POST 时对我有用。

回答by Andrea Motto

JsonObjectRequestadds Content-Type: application/json; charset=utf-8by default. Your headers.put("Content-Type", "application/json");adds another Content-Typeand some applications don't work with multiple Content-Typedefinitions. You should try to remove headers.put("Content-Type", "application/json");.

JsonObjectRequestContent-Type: application/json; charset=utf-8默认添加。您headers.put("Content-Type", "application/json");添加了另一个，Content-Type并且某些应用程序不适用于多个Content-Type定义。您应该尝试删除headers.put("Content-Type", "application/json");.

回答by jonathan3087

 @Override
public String getBodyContentType() {
    return "application/json";
}

This worked for me using a PUT request.

这对我使用 PUT 请求有效。

回答by bayramcicek

I was looking for Android Volley Put (JSON) with request body in Kotlin language but all answers in Java. Maybe someone looking for answers in Kotlin so I created Put with request body in Kotlin language:

我正在寻找带有 Kotlin 语言请求正文的 Android Volley Put (JSON)，但所有答案都是 Java。也许有人在 Kotlin 中寻找答案，所以我用 Kotlin 语言创建了带有请求体的 Put：

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    // let's say we have token, apiLink, val1, val2, val3 as a String
    // created a function sendPutRequest()
    sendPutRequest(token, apiLink, val1, val2, val3)
}

private fun sendPutRequest(
    token: String,
    apiLink: String,
    val1: String,
    val2: String,
    val3: String
) {

    val queue = Volley.newRequestQueue(this)
    val jsonObject = JSONObject()

    try {
        jsonObject.put("token", token)
        jsonObject.put("val1", val1)
        jsonObject.put("val2", val2)
        jsonObject.put("val3", val3)
    } catch (e: JSONException) {
        // handle exception
        Log.i("json_error: ", "$e")
    }

     val putRequest: JsonObjectRequest =
        object : JsonObjectRequest(
            Method.PUT, apiLink, jsonObject,
            Response.Listener { response ->
                // response
                Log.i("response: ", "$response")
            },
            Response.ErrorListener { error ->
                // error
                Log.i("error: ", "$error")
            }
        ) {

            override fun getHeaders(): Map<String, String> {
                val headers: MutableMap<String, String> =
                    HashMap()
                headers["Content-Type"] = "application/json"
                headers["Accept"] = "application/json"
                return headers
            }

            override fun getBody(): ByteArray {
                    Log.i("json", jsonObject.toString())
                    return jsonObject.toString().toByteArray(charset("UTF-8"))
            }

        }
    queue.add(putRequest)
}

回答by László Csiki

Just try with a StringRequest, like this:

只需尝试使用 StringRequest，如下所示：

StringRequest putRequest = new StringRequest(Request.Method.PUT, url,
        new Response.Listener<String>()
        {
@Override
public void onResponse(String response) {
        // response
        Log.d("Response", response.toString());
        }
        },
        new Response.ErrorListener()
        {
@Override
public void onErrorResponse(VolleyError error) {
        // error
        Log.d("Error.Response", error.toString());
        }
        }
        ) {

@Override
public Map<String, String> getHeaders()
        {
        Map<String, String> headers = new HashMap<String, String>();
        headers.put("Content-Type", "application/json");
        //or try with this:
        //headers.put("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");
        return headers;
        }
@Override
protected Map<String, String> getParams() {
        Map<String, String> params = new HashMap<String, String>();
        params.put("password", "ttttt");
        params.put("username", "tester3");
        params.put("token", "blah");
        return params;
        }
        };

        queue.add(putRequest);
        }

回答by rolandvitezhu

Some hosting service provider block certain request methods, such as PUT or DELETE - e.g. 000webhost blocks PUT and DELETE requests for free users. If PUT method is blocked on the host for some reason, you can substitute it with POST method. I know, this is not the best solution, but it works.

一些托管服务提供商会阻止某些请求方法，例如 PUT 或 DELETE - 例如000webhost 会阻止免费用户的 PUT 和 DELETE 请求。如果 PUT 方法由于某种原因在主机上被阻止，您可以将其替换为 POST 方法。我知道，这不是最好的解决方案，但它有效。

回答by Francisco Arriagada

I spent a lot of time looking for how to do this. What worked for me was changing

我花了很多时间寻找如何做到这一点。对我有用的东西正在改变

Request.Method.PUT

to

到

Request.Method.POST