我正在尝试从Api获取数据，但是发生了错误。 我有类似的参数：
oauth_consumer_key- String --Your API key when you registered as a developer
oauth_signature_method- String-- The method used to generate the signature (only HMAC-SHA1 is supported)
oauth_timestamp -Int --The date and time, expressed in the number of seconds since January 1, 1970 00:00:00 GMT. The timestamp value must be a positive integer and must be equal or greater than the timestamp used in previous requests
oauth_nonce -String-- A randomly generated string for a request that can be combined with the timestamp to produce a unique value
oauth_version -String --MUST be "1.0"
oauth_signature- String-- The signature, a consistent reproducible concatenation of the request elements into a single string. The string is used as an input in hashing or signing algorithms.
method -String --MUST be "recipes.search"
我的班级看上去就像我在使用Volley库来获取数据的地方：
final static private String APP_METHOD = "GET";
final static private String APP_KEY = "app key is here";
final static private String APP_SECRET = "secret key is here&";
final static private String APP_URL = "http://platform.fatsecret.com/rest/server.api";
private static final String HMAC_SHA1_ALGORITHM = "HMAC-SHA1";
private static String paramify(String[] params) {
String[] p = Arrays.copyOf(params, params.length);
Arrays.sort(p);
return join(p, "&");
}
private static String join(String[] array, String separator) {
StringBuilder b = new StringBuilder();
for (int i = 0; i < array.length; i++) {
if (i > 0)
b.append(separator);
b.append(array[i]);
}
return b.toString();
}
//generating nonce value
private static String nonce() {
Random r = new Random();
StringBuilder n = new StringBuilder();
for (int i = 0; i < r.nextInt(8) + 2; i++)
n.append(r.nextInt(26) + 'a');
return n.toString();
}
//timestamp
Long tsLong = System.currentTimeMillis() / 1000;
int ts = Integer.parseInt(tsLong.toString());
private static String[] generateOauthParams(int page) {
return new String[]{
"oauth_consumer_key=" + APP_KEY,
"oauth_signature_method=HMAC-SHA1",
"oauth_timestamp=" +
Long.valueOf(System.currentTimeMillis() * 2).toString(),
"oauth_nonce=" + nonce(),
"oauth_version=1.0",
"format=json"};
}
private static String signature(String[] params) {
String[] p = {RecipeActivity.APP_METHOD, Uri.encode(RecipeActivity.APP_URL), Uri.encode(paramify(params))};
String s = join(p, "&");
SecretKey sk = new SecretKeySpec(APP_SECRET.getBytes(), HMAC_SHA1_ALGORITHM);
try {
Mac m = Mac.getInstance(HMAC_SHA1_ALGORITHM);
m.init(sk);
haang = Uri.encode(new String(Base64.encode(m.doFinal(s.getBytes()), Base64.DEFAULT)).trim());
return haang;
} catch (java.security.NoSuchAlgorithmException | java.security.InvalidKeyException e) {
Log.w("FatSecret_TEST FAIL", e.getMessage());
return null;
}
}
//signature method
//is is never used
public JSONObject searchRecipes(String searchRecipes, int page) {
List<String> params = new ArrayList<>(Arrays.asList(generateOauthParams(page)));
String[] template = new String[1];
params.add("method=recipes.search");
params.add("search_expression=" + Uri.encode(searchRecipes));
params.add("oauth_signature=" + signature(params.toArray(template)));
JSONObject foods = null;
try {
URL url = new URL(APP_URL + "?" + paramify(params.toArray(template)));
URLConnection api = url.openConnection();
String line;
StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(api.getInputStream()));
while ((line = reader.readLine()) != null) builder.append(line);
JSONObject food = new JSONObject(builder.toString()); // { first
foods = food.getJSONObject("recipes"); // { second
} catch (Exception exception) {
Log.e("Json error", exception.toString());
exception.printStackTrace();
}
return foods;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipe);
System.out.println("haang"+haang);
final RequestQueue requestQueue = Volley.newRequestQueue(RecipeActivity.this);
StringRequest stringRequest=new StringRequest(Request.Method.GET, APP_URL, new com.android.volley.Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.i("success", response);
}
}, new com.android.volley.Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.i("error",error.getMessage());
}
});
requestQueue.add(stringRequest);
}
}
但是我遇到了错误。我正试图以Xml格式获取数据。这是我的日志。我是这个概念的新手，不知道我在做什么错。
<error xmlns="http://platform.fatsecret.com/api/1.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://platform.fatsecret.com/api/1.0/ http://platform.fatsecret.com/api/1.0/fatsecret.xsd">
<code>2</code>
<message>Missing required oauth parameter: oauth_signature_method</message>
</error>
为什么我遇到此错误。请指导我。