如何为Volley请求设置自定义标头?目前,已经有一种方式来设置POST请求的主体内容。我有一个简单的GET请求,但我需要传递自定义标头。我不知道JsonRequest类是否支持这样做。它是否可能实现?
如何为Volley请求设置自定义标头?目前,已经有一种方式来设置POST请求的主体内容。我有一个简单的GET请求,但我需要传递自定义标头。我不知道JsonRequest类是否支持这样做。它是否可能实现?
使用getParams()方法得到的答案是用于设置POST请求体数据的,但是标题中提出的问题是如何设置HTTP头信息,例如User-Agent。正如CommonsWare所说,您需要重写getHeaders()方法。以下是一些示例代码,它将User-Agent设置为“Nintendo Gameboy”,将Accept-Language设置为“fr”:
public void requestWithSomeHttpHeaders() {
RequestQueue queue = Volley.newRequestQueue(this);
String url = "http://www.somewebsite.com";
StringRequest getRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
// response
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
Log.d("ERROR","error => "+error.toString());
}
}
) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("User-Agent", "Nintendo Gameboy");
params.put("Accept-Language", "fr");
return params;
}
};
queue.add(getRequest);
}
看起来你覆盖了public Map<String, String> getHeaders()
,定义在Request
中的方法,以返回你所需的HTTP标头。
如果你需要在不使用URL添加信息的情况下发布数据。
public Request post(String url, String username, String password,
Listener listener, ErrorListener errorListener) {
JSONObject params = new JSONObject();
params.put("user", username);
params.put("pass", password);
Request req = new Request(
Method.POST,
url,
params.toString(),
listener,
errorListener
);
return req;
}
如果你想编辑请求头,这就是你需要做的:// could be any class that implements Map
Map<String, String> mHeaders = new ArrayMap<String, String>();
mHeaders.put("user", USER);
mHeaders.put("pass", PASSWORD);
Request req = new Request(url, postBody, listener, errorListener) {
public Map<String, String> getHeaders() {
return mHeaders;
}
}
getHeaders()
中设置必要的头信息。
public class StringRequest extends com.android.volley.toolbox.StringRequest {
private final Map<String, String> _params;
/**
* @param method
* @param url
* @param params
* A {@link HashMap} to post with the request. Null is allowed
* and indicates no parameters will be posted along with request.
* @param listener
* @param errorListener
*/
public StringRequest(int method, String url, Map<String, String> params, Listener<String> listener,
ErrorListener errorListener) {
super(method, url, listener, errorListener);
_params = params;
}
@Override
protected Map<String, String> getParams() {
return _params;
}
/* (non-Javadoc)
* @see com.android.volley.toolbox.StringRequest#parseNetworkResponse(com.android.volley.NetworkResponse)
*/
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
// since we don't know which of the two underlying network vehicles
// will Volley use, we have to handle and store session cookies manually
MyApp.get().checkSessionCookie(response.headers);
return super.parseNetworkResponse(response);
}
/* (non-Javadoc)
* @see com.android.volley.Request#getHeaders()
*/
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = super.getHeaders();
if (headers == null
|| headers.equals(Collections.emptyMap())) {
headers = new HashMap<String, String>();
}
MyApp.get().addSessionCookie(headers);
return headers;
}
MyApp类:
代码如下:
public class MyApp extends Application {
private static final String SET_COOKIE_KEY = "Set-Cookie";
private static final String COOKIE_KEY = "Cookie";
private static final String SESSION_COOKIE = "sessionid";
private static MyApp _instance;
private RequestQueue _requestQueue;
private SharedPreferences _preferences;
public static MyApp get() {
return _instance;
}
@Override
public void onCreate() {
super.onCreate();
_instance = this;
_preferences = PreferenceManager.getDefaultSharedPreferences(this);
_requestQueue = Volley.newRequestQueue(this);
}
public RequestQueue getRequestQueue() {
return _requestQueue;
}
/**
* Checks the response headers for session cookie and saves it
* if it finds it.
* @param headers Response Headers.
*/
public final void checkSessionCookie(Map<String, String> headers) {
if (headers.containsKey(SET_COOKIE_KEY)
&& headers.get(SET_COOKIE_KEY).startsWith(SESSION_COOKIE)) {
String cookie = headers.get(SET_COOKIE_KEY);
if (cookie.length() > 0) {
String[] splitCookie = cookie.split(";");
String[] splitSessionId = splitCookie[0].split("=");
cookie = splitSessionId[1];
Editor prefEditor = _preferences.edit();
prefEditor.putString(SESSION_COOKIE, cookie);
prefEditor.commit();
}
}
}
/**
* Adds session cookie to headers if exists.
* @param headers
*/
public final void addSessionCookie(Map<String, String> headers) {
String sessionId = _preferences.getString(SESSION_COOKIE, "");
if (sessionId.length() > 0) {
StringBuilder builder = new StringBuilder();
builder.append(SESSION_COOKIE);
builder.append("=");
builder.append(sessionId);
if (headers.containsKey(COOKIE_KEY)) {
builder.append("; ");
builder.append(headers.get(COOKIE_KEY));
}
headers.put(COOKIE_KEY, builder.toString());
}
}
}
Kotlin中,
你需要重写getHeaders()方法,例如:
val volleyEnrollRequest = object : JsonObjectRequest(GET_POST_PARAM, TARGET_URL, PAYLOAD_BODY_IF_YOU_WISH,
Response.Listener {
// Success Part
},
Response.ErrorListener {
// Failure Part
}
) {
// Providing Request Headers
override fun getHeaders(): Map<String, String> {
// Create HashMap of your Headers as the example provided below
val headers = HashMap<String, String>()
headers["Content-Type"] = "application/json"
headers["app_id"] = APP_ID
headers["app_key"] = API_KEY
return headers
}
}
ImageView mImageView;
String url = "http://i.imgur.com/7spzG.png";
mImageView = (ImageView) findViewById(R.id.myImage);
...
// Retrieves an image specified by the URL, displays it in the UI.
mRequestQueue = Volley.newRequestQueue(context);;
ImageRequest request = new ImageRequest(url,
new Response.Listener() {
@Override
public void onResponse(Bitmap bitmap) {
mImageView.setImageBitmap(bitmap);
}
}, 0, 0, null,
new Response.ErrorListener() {
public void onErrorResponse(VolleyError error) {
mImageView.setImageResource(R.drawable.image_load_error);
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new Map<String, String>();
params.put("User-Agent", "one");
params.put("header22", "two");
return params;
};
mRequestQueue.add(request);
试试这个
{
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
String bearer = "Bearer ".concat(token);
Map<String, String> headersSys = super.getHeaders();
Map<String, String> headers = new HashMap<String, String>();
headersSys.remove("Authorization");
headers.put("Authorization", bearer);
headers.putAll(headersSys);
return headers;
}
};
public class CustomVolleyRequest extends StringRequest {
public CustomVolleyRequest(int method, String url,
Response.Listener<String> listener,
Response.ErrorListener errorListener) {
super(method, url, listener, errorListener);
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<>();
headers.put("key1","value1");
headers.put("key2","value2");
return headers;
}
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
.
.
.
return params;
}
我不得不添加:
@Override
public String getBodyContentType() {
return /*(for exmaple)*/ "application/json";
}
public class CustomJsonObjectRequest extends JsonObjectRequest
{
public CustomJsonObjectRequest(int method, String url, JSONObject jsonRequest,Response.Listener listener, Response.ErrorListener errorListener)
{
super(method, url, jsonRequest, listener, errorListener);
}
@Override
public Map getHeaders() throws AuthFailureError {
Map headers = new HashMap();
headers.put("AppId", "xyz");
return headers;
}
}