Question

为了解析JSON，我想从特定网站加载文本。我的代码适用于许多网站，例如http://api.openweathermap.org或http://stackoverflow.com。代码加载任何非json url的json文本或源代码。但是，如果我尝试从此特定URL加载文本，则代码将返回一个空字符串：https://www.instagram.com/1x/?__a=1。我不知道为什么它不起作用。

public String getJsonStringFromUrl(String url) {

    // make HTTP request
    try {

        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();

    } catch (Exception e) {
        Log.e(TAG, "Error converting result " + e.toString());
    }

    return json;
}

Answer 1

提到@DSlomer64时，问题是已弃用的 DefaultHttpClient 。它适用于okhttp

import java.io.IOException;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class GetTextFromUrl {
    OkHttpClient client = new OkHttpClient();

    String run(String url) throws IOException {
        Request request = new Request.Builder()
                .url(url)
                .build();

        try (Response response = client.newCall(request).execute()) {
            return response.body().string();
        }
    }

}

无法从特定URL加载文本

1 个答案: