如何在使用 API POST 数据时解决意外的响应代码 400

Question

由于我无法使用此 api 发布数据，我得到的响应代码为 400，所以你能帮我摆脱这个吗 这是我的活动

String BASE_URL = "http://74.207.233.160/api/v1/users";
StringRequest stringRequest = new StringRequest(Request.Method.POST, BASE_URL,new Response.Listener<String>() {
    @Override
    public void onResponse(String response) {
        progressBar.setVisibility(View.GONE);
        Log.d("SignupActivity", "onResponse" +response);
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        Toast.makeText(SignupActivity.this, "Error.......", Toast.LENGTH_SHORT).show();
        error.printStackTrace();
    }
}){
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        Map<String, String> params = new HashMap<String, String>();
        params.put("email", email);
        params.put("password", password);
        params.put("role", role);
        return params;
    }
};
MySingleTon.getInstance(SignupActivity.this).addToRequestQueue(stringRequest);

这是我的 SingleTon 类

public class MySingleTon {

private static MySingleTon mInstance;
private RequestQueue requestQueue;
private static Context mCtx;

private MySingleTon(Context context){
    mCtx = context;
    requestQueue = getRequestQueue();
}

public static synchronized MySingleTon getInstance(Context context){
    if (mInstance == null){
        mInstance = new MySingleTon(context);
    }
    return mInstance;
}

public RequestQueue getRequestQueue() {
    if (requestQueue == null){
        requestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
    }
    return  requestQueue;
}

public void addToRequestQueue(Request request){
    requestQueue.add(request);
}
}

这里是错误的详细信息

E/Volley: [4370] BasicNetwork.performRequest: Unexpected response code 400 for http://74.207.233.160/api/v1/users

这是我的邮递员屏幕截图 postman post data 从上面的邮递员那里，如果我使用用户 [email]，我会收到响应代码 500

Answer 1

附加的 Postman 屏幕截图使用标题来提供键值对。在您的示例中，您正在覆盖 getParams 方法，并且实际上您正在对 URL 发出 POST 请求：

http://74.207.233.160/api/v1/users?email=youremail&password=yourpassword&role=yourrole;

如果我理解正确，您应该覆盖 getHeaders 方法。

编辑： 根据 cmets，您需要的是请求正文中的 JSON 字符串。要设置适当的请求标头，请使用 JsonBodyRequest 类：

import com.android.volley.toolbox.JsonObjectRequest;
import org.json.JSONObject;
...
JSONObject body = new JSONObject();
body.put("email", "youremail");
body.put("role", "yourrole");

final String requestBody = body.toString();

String BASE_URL = "http://74.207.233.160/api/v1/users";
StringRequest stringRequest = new JsonObjectRequest(Request.Method.POST, BASE_URL,new Response.Listener<JSONObject>() {
    @Override
    public void onResponse(JSONObject response) {
        progressBar.setVisibility(View.GONE);
        Log.d("SignupActivity", "onResponse" + String.valueOf(response));
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        Toast.makeText(SignupActivity.this, "Error.......", Toast.LENGTH_SHORT).show();
        error.printStackTrace();
    }
}){
    @Override
    public byte[] getBody() {
        // Here you provide the body from the previously stringified JSON object
        return requestBody.getBytes("utf-8");
    }
};