Android截击贴子串入身体

Question

我正在尝试使用Volley库与我的RESTful API通信。

当我要持票人代币时，我必须在身体里贴上绳子。字符串应如下所示：grant_type=password

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

不幸的是，我不知道如何解决它...

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;
                    }
                };

我一直收到400个坏请求。我想我实际上是这样发送请求的：

grant_type:password, username:User0, password:Password0

而不是：

grant_type=password&username=Alice&password=password123

如果有人有任何想法或建议，我将不胜感激。。

Answer 1

我知道这很古老，但我遇到了同样的问题，我在这里找到了一个更干净的解决方案：如何使用带有字符串体的截击发送POST请求？

Answer 2

首先，我建议您通过打印日志或使用网络嗅探器（如wireshark或fiddler）查看发送的内容。

试着把帕拉姆放进体内怎么样？如果您仍然想要一个StringRequest，您需要扩展它并覆盖getBody（）方法（类似于JsonObjectRequest）

Answer 3

要发送带有用户名和密码等参数的普通POST请求（无JSON），通常需要覆盖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);
}

要在Volley StringRequest中发送任意字符串作为POST体数据，需要覆盖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);
}

另一方面，凌空文档是不存在的，而且StackOverflow答案的质量非常差。真不敢相信这样一个例子的答案还没有出现。