在我的 CountryActivity.java
中,我有一个 HttpRequest 来检索维基百科的 json 信息。
这是我使用 AsyncTask
的代码:
private class DownloadFilesTask extends AsyncTask<URL, Integer, String> {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("https://en.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro=&explaintext=&titles=Portugal");
protected String doInBackground(URL... urls) {
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpPost);
} catch (IOException e) {
e.printStackTrace();
}
HttpEntity httpEntity = httpResponse.getEntity();
try {
is = httpEntity.getContent();
} 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");
System.out.println(line);
}
is.close();
return sb.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String result) {
showDialog(Integer.parseInt("Downloaded "));
}
}
并且,为了在我的 Activity 中调用类,我使用 new DownloadFilesTask();
。
问题是,当我调试我的私有(private)类时,调试器在 HttpPost httpPost = new HttpPost("https://en.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro =&explaintext=&titles=Portugal");
它甚至无法检索 json。你知道会发生什么吗?我的应用程序没有崩溃或什么都没有...
最佳答案
使用 HttpURLConnection
打开到 url 的连接并将 setRequestMethod()
设置为 GET
URL obj = new URL("https://en.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro=&explaintext=&titles=Portugal");
HttpURLConnection http = (HttpURLConnection) obj.openConnection();
http.setRequestMethod("GET");
然后获取其输入流并通过 BufferedReader
读取到您的构建。
BufferedReader reader = new BufferedReader(new InputStreamReader(http.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
reader.close();
String json_string = sb.toString(); // your json data
检查 here full example了解击球手。
关于java - 我的程序不会通过 HttpPost,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51156312/