Android JSON HttpClient 使用 HttpResponse 将数据发送到 PHP 服务器

Question

我目前正在尝试将一些数据从 Android 应用程序发送到 php 服务器（两者都由我控制）。

在应用程序的一个表单上收集了很多数据，这些数据被写入数据库。这一切都有效。

在我的主要代码中，首先我创建了一个 JSONObject（我在此示例中已将其删减）：

JSONObject j = new JSONObject();
j.put("engineer", "me");
j.put("date", "today");
j.put("fuel", "full");
j.put("car", "mine");
j.put("distance", "miles");

接下来我将对象传递给发送，并接收响应：

String url = "http://www.server.com/thisfile.php";
HttpResponse re = HTTPPoster.doPost(url, j);
String temp = EntityUtils.toString(re.getEntity());
if (temp.compareTo("SUCCESS")==0)
{
    Toast.makeText(this, "Sending complete!", Toast.LENGTH_LONG).show();
}

HTTPPoster 类：

public static HttpResponse doPost(String url, JSONObject c) throws ClientProtocolException, IOException 
{
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost request = new HttpPost(url);
    HttpEntity entity;
    StringEntity s = new StringEntity(c.toString());
    s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
    entity = s;
    request.setEntity(entity);
    HttpResponse response;
    response = httpclient.execute(request);
    return response;
}

这会得到响应，但服务器正在返回 403 - Forbidden 响应。

我尝试稍微更改 doPost 函数（这实际上更好一点，正如我所说的，我有很多要发送的，基本上是 3 个具有不同数据的相同表单 - 所以我创建了 3 个 JSONObjects，每个表单条目一个- 条目来自数据库，而不是我正在使用的静态示例）。

首先我稍微改变了调用：

String url = "http://www.myserver.com/ServiceMatalan.php";
Map<String, String> kvPairs = new HashMap<String, String>();
kvPairs.put("vehicle", j.toString());
// Normally I would pass two more JSONObjects.....
HttpResponse re = HTTPPoster.doPost(url, kvPairs);
String temp = EntityUtils.toString(re.getEntity());
if (temp.compareTo("SUCCESS")==0)
{
    Toast.makeText(this, "Sending complete!", Toast.LENGTH_LONG).show();
}

好的，对 doPost 函数的更改：

public static HttpResponse doPost(String url, Map<String, String> kvPairs) throws ClientProtocolException, IOException 
{
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(url);
    if (kvPairs != null && kvPairs.isEmpty() == false) 
    {
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(kvPairs.size());
        String k, v;
        Iterator<String> itKeys = kvPairs.keySet().iterator();
        while (itKeys.hasNext()) 
        {
            k = itKeys.next();
            v = kvPairs.get(k);
            nameValuePairs.add(new BasicNameValuePair(k, v));
        }             
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
    }
    HttpResponse response;
    response = httpclient.execute(httppost);
    return response;
}

Ok 所以这会返回响应 200

int statusCode = re.getStatusLine().getStatusCode();

但是，服务器上接收到的数据无法解析为 JSON 字符串。我认为它的格式很糟糕（这是我第一次使用 JSON）：

如果在 php 文件中我对 $_POST['vehicle'] 进行回显，我会得到以下信息：

{\"date\":\"today\",\"engineer\":\"me\"}

谁能告诉我哪里出了问题，或者是否有更好的方法来实现我想要做的事情？希望以上内容有意义！

Answer 1

试试这段代码，它工作得很好

*For HttpClient class* download jar file "httpclient-4.3.6.jar" and put in libs folder then
Compile:   dependencies {compile files('libs/httpclient-4.3.6.jar')}

repositories {
        maven {
            url "https://jitpack.io"
        }
    }

然后调用 HttpClient 类这个 AsyncTask 像这样：

私有类 YourTask 扩展 AsyncTask { private String error_msg = "服务器错误！";

    private JSONObject response;



    @Override
    protected Boolean doInBackground(String... params) {
        try {
            JSONObject mJsonObject = new JSONObject();
            mJsonObject.put("user_id", "user name");
            mJsonObject.put("password", "123456");
            String URL=" Your Link"

            //Log.e("Send Obj:", mJsonObject.toString());

            response = HttpClient.SendHttpPost(URL, mJsonObject);
            boolean status = response != null && response.getInt("is_error") == 0; // response

            return status;
        } catch (JSONException | NullPointerException e) {
            e.printStackTrace();
            mDialog.dismiss();
            return false;
        }
    }

    @Override
    protected void onPostExecute(Boolean status) {
       // your code

    }
}

Answer 2

试试这个对我有用的代码

public void postData(String result,JSONObject obj) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpParams myParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(myParams, 10000);
HttpConnectionParams.setSoTimeout(myParams, 10000);

String json=obj.toString();

try {

    HttpPost httppost = new HttpPost(result.toString());
    httppost.setHeader("Content-type", "application/json");

    StringEntity se = new StringEntity(obj.toString()); 
    se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
    httppost.setEntity(se); 

    HttpResponse response = httpclient.execute(httppost);
    String temp = EntityUtils.toString(response.getEntity());
    Log.i("tag", temp);


} catch (ClientProtocolException e) {

} catch (IOException e) {
}

}

Answer 3

改变

(String url = "http://www.server.com/MainPage.php";)

到

(String url = "http://www.server.com/MainPage.php?";)

当您尝试将参数发送到 php 脚本时，末尾的问号是必需的。

Answer 4

StringEntity s = new StringEntity(c.toString());
s.setContentEncoding("UTF-8");
s.setContentType("application/json");
request.setEntity(s);

Answer 5

经过大量阅读和搜索，我发现了问题所在，我相信在服务器上启用了 magic_quotes_gpc。

因此，使用：

json_decode(stripslashes($_POST['vehicle']));

在我上面的示例中，删除了斜线并允许正确解码 JSON。

仍然不确定为什么发送 StringEntity 会导致 403 错误？