Question

在我的应用程序中使用HttpPost像这样解析json

`

HttpClient httpClient = new DefaultHttpClient();
HttpParams httpParameters = httpClient.getParams();
HttpConnectionParams.setTcpNoDelay(httpParameters, true);
 HttpContext localContext = new BasicHttpContext();

  String url="http://ashishva.comxa.com/getdata_shoplistl_f.php?route="+sroute+"&shop_type="+sshoptype;
 HttpPost httpGet = new HttpPost(url);
  HttpResponse response = httpClient.execute(httpGet, localContext);
   BufferedReader reader = new BufferedReader(new  InputStreamReader(response.getEntity().getContent()`

我的清单文件已正确设置为可访问互联网

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

我在我的浏览器中获取了json，但是只在我的Android手机和模拟器中获得了结果。为什么会这样呢？为什么有时候得到而不是后来。

虽然我没有得到任何数据，但我得到了例外

"java.net.UnknownHostException: Unable to resolve host "ashishva.comxa.com": No address associated with hostname"

Answer 1

实际上我找到了解决方案。这一行

HttpPost httpGet = new HttpPost(url);

必须用HttpGet替换为

 HttpGet httpGet = new HttpGet(url);

Answer 2

我发现的最好的一个是Android开发人员培训，下面是链接

http://developer.android.com/training/basics/network-ops/connecting.html

连接并下载数据


    // Given a URL, establishes an HttpUrlConnection and retrieves
    // the web page content as a InputStream, which it returns as a string.

    private String downloadUrl(String myurl) throws IOException {
        InputStream is = null;
        // Only display the first 500 characters of the retrieved
        // web page content.
        int len = 500;

        try {
            URL url = new URL(myurl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(10000 /* milliseconds */);
            conn.setConnectTimeout(15000 /* milliseconds */);
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            // Starts the query
            conn.connect();
            int response = conn.getResponseCode();
            Log.d(DEBUG_TAG, "The response is: " + response);
            is = conn.getInputStream();

            // Convert the InputStream into a string
            String contentAsString = readIt(is, len);
            return contentAsString;

        // Makes sure that the InputStream is closed after the app is
        // finished using it.
        } finally {
            if (is != null) {
                is.close();
            } 
        }
    }

将InputStream转换为String


    // Reads an InputStream and converts it to a String.
    public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException {
        Reader reader = null;
        reader = new InputStreamReader(stream, "UTF-8");        
        char[] buffer = new char[len];
        reader.read(buffer);
        return new String(buffer);

}

Android无法使用HttpPost解析主机 - java.net.UnknownHostException

2 个答案: