Question

我无法通过Android应用调用API。我正在使用此网站寻求帮助：http://kylewbanks.com/blog/Tutorial-Android-Parsing-JSON-with-GSON

当我尝试将URL更改为我想要使用的API时，我得到一个：“服务器响应状态代码：404”。

这是我第一次使用AsyncTask，所以我希望我能正确地做到这一点。这是我的AsyncTask类：

private class PostFetcher extends AsyncTask<Void, Void, String> {
    private static final String TAG = "PostFetcher";
    public String SERVER_URL = "https://bitpay.com/api/rates";

    @Override
    protected String doInBackground(Void... params) {
        try {
            //Create an HTTP client
            HttpClient client = new DefaultHttpClient();
            HttpPost post = new HttpPost(SERVER_URL);

            //Perform the request and check the status code
            HttpResponse response = client.execute(post);
            StatusLine statusLine = response.getStatusLine();
            if(statusLine.getStatusCode() == 200) {
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();

                try {
                    //Read the server response and attempt to parse it as JSON
                    Reader reader = new InputStreamReader(content);

                    Log.i(TAG, "Connected");

                    content.close();

                } catch (Exception ex) {
                    Log.e(TAG, "Failed to parse JSON due to: " + ex);
                    failedLoadingPosts();
                }
            } else {
                Log.e(TAG, "Server responded with status code: " + statusLine.getStatusCode());
                failedLoadingPosts();
            }
        } catch(Exception ex) {
            Log.e(TAG, "Failed to send HTTP POST request due to: " + ex);
            failedLoadingPosts();
        }
        return null;
    } 
}

在onCreate上，我打电话给： PostFetcher fetcher = new PostFetcher（）; fetcher.execute（）;

关于为什么我收到404错误代码的任何想法，即使网站功能正常？谢谢！

Answer 1

也许您需要使用HTTP GET代替POST。

Answer 2

您是否设置了权限

     <uses-permission android:name="android.permission.INTERNET" />

并尝试这种方式

class PostFetcher extends AsyncTask<Void, Void, String> {
private static final String TAG = "PostFetcher";
public String SERVER_URL = "https://bitpay.com/api/rates";

@Override
protected String doInBackground(Void... params) {
    try {
        String result ="";

        URL myUrl = new URL(SERVER_URL);

        HttpURLConnection conn = (HttpURLConnection) myUrl
                .openConnection();

        //conn.setRequestMethod("POST"); //if you need set POST
        conn.setDoInput(true);
        conn.setDoOutput(true);

        conn.connect();

        InputStream is = conn.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();
        String lineJSON = null;
        while ((lineJSON = reader.readLine()) != null) {
            sb.append(lineJSON + "\n");
        }
        result = sb.toString();
        Log.d(TAG, result);


    } catch(Exception ex) {
        Log.e(TAG, "Failed to send HTTP POST request due to: " + ex);
        //failedLoadingPosts();
    }
    return null;
} 
}

祝你好运！

API的HttpClient问题：错误代码404

2 个答案: