Question

以前，我可以远程访问php中的字符串。我一开始觉得很难，但AsyncTask为我做了工作。现在，我可以访问从php到sql server的查询结果。但我想从我的java类传递一个字符串到php，当我搜索一些信息时，我看到了一些JSON帖子并获取代码，但我无法清楚地理解它们。这是我的代码：

protected String doInBackground(Void... params) {

            BufferedReader br = null;
            StringBuilder sb = new StringBuilder();
            String url = "http://122.2.8.226/MITBookstore/sqlconnect.php";
            HttpURLConnection urlConnection = null;

            String line;

            try {
                urlConnection = (HttpURLConnection) new URL(url).openConnection();
                InputStream in = urlConnection.getInputStream();

                br = new BufferedReader(new InputStreamReader(in));
                while ((line = br.readLine()) != null) {
                    sb.append(line);
                }
            }
            catch (Exception e) {
               e.printStackTrace();
            }
            finally {
                if (br != null) {
                    try {
                        br.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }

            return sb.toString();

该字符串包含在“sb.toString（）”中。现在我如何在我的代码中添加一个JSON来将字符串从java发送到php，并且还从php获取结果字符串到java。提前感谢您的帮助。

Answer 1

如果从服务器收到JSON格式的响应，请首先将json字符串设为JSONObject。然后阅读json数据供您使用。

try {
    JSONObject obj = new JSONObject(sb.toString());   // make string to json obj

    Iterator iter = obj.keys();     // get all keys from json obj and iterating
    while(iter.hasNext()){
        String key = (String)iter.next();
        String str = obj.get(key).toString();

       // write your code
    }
} catch(Exception e) {
    e.printStackTrace();
}

您的代码已包含您问题的答案。在创建url连接之后，只需添加用于使用OutputStreamWriter将数据发送到服务器的参数，就像使用InpustStreamReader接收响应一样。

        BufferedReader br = null;
        StringBuilder sb = new StringBuilder();
        String url = "http://122.2.8.226/MITBookstore/sqlconnect.php";
        HttpURLConnection urlConnection = null;

        String line;
        try {
            urlConnection = (HttpURLConnection) new URL(url).openConnection();

            // wrtie params
            OutputStreamWriter we = new OutputStreamWriter(urlConnection.getOutPutStream());
            wr.write(data);       // data (make json obj to 'key=value' string)
            wr.flush();
            wr.close();
            // read response
            InputStream in = urlConnection.getInputStream();

            br = new BufferedReader(new InputStreamReader(in));
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
        }
        catch (Exception e) {
           e.printStackTrace();
        }
        finally {
            if (br != null) {
                try {
                    br.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }enter code here

如何使用JSON传递和读取从android到sql的字符串

1 个答案: