我正在为一个 Android 应用程序编写代码,该程序本应获取数据,将其打包为 Json 格式并发布到网络服务器,而网络服务器本应以 json 格式做出响应。
使用 GET 请求可以正常工作,但出于某种原因,使用 POST 请求时,所有数据似乎都被剥离了,服务器什么也收不到。
以下是代码片段:
HttpParams params = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(params, 5000);
HttpConnectionParams.setSoTimeout(params, 5000);
DefaultHttpClient httpClient = new DefaultHttpClient(params);
BasicCookieStore cookieStore = new BasicCookieStore();
httpClient.setCookieStore(cookieStore);
String uri = JSON_ADDRESS;
String result = "";
String username = "user";
String apikey = "something";
String contentType = "application/json";
JSONObject jsonObj = new JSONObject();
try {
jsonObj.put("username", username);
jsonObj.put("apikey", apikey);
} catch (JSONException e) {
Log.e(TAG, "JSONException: " + e);
}
HttpPost httpPost = new HttpPost(uri);
List<NameValuePair> postParams = new ArrayList<NameValuePair>();
postParams.add(new BasicNameValuePair("json", jsonObj.toString()));
HttpGet httpGet = null;
try {
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParams);
entity.setContentEncoding(HTTP.UTF_8);
entity.setContentType("application/json");
httpPost.setEntity(entity);
httpPost.setHeader("Content-Type", contentType);
httpPost.setHeader("Accept", contentType);
} catch (UnsupportedEncodingException e) {
Log.e(TAG, "UnsupportedEncodingException: " + e);
}
try {
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
if (httpEntity != null) {
InputStream is = httpEntity.getContent();
result = StringUtils.convertStreamToString(is);
Log.i(TAG, "Result: " + result);
}
} catch (ClientProtocolException e) {
Log.e(TAG, "ClientProtocolException: " + e);
} catch (IOException e) {
Log.e(TAG, "IOException: " + e);
}
return result;
我想我已经遵循了如何创建参数和发布参数的一般指南,但显然没有。
此时此刻,我非常欢迎任何帮助或指点(花了几个小时才发现没有发送任何发布数据)。真正的服务器是在Tomcat上运行Wicket的,但我也在一个简单的PHP页面上进行了测试,结果没有什么不同。
实际上,您可以通过以下方式以 JSON 格式发送:
// Build the JSON object to pass parameters
JSONObject jsonObj = new JSONObject();
jsonObj.put("username", username);
jsonObj.put("apikey", apikey);
// Create the POST object and add the parameters
HttpPost httpPost = new HttpPost(url);
StringEntity entity = new StringEntity(jsonObj.toString(), HTTP.UTF_8);
entity.setContentType("application/json");
httpPost.setEntity(entity);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(httpPost);
您有没有试过不使用 JSON 对象,而只传递两个基本名称对? 另外,这可能与您的服务器设置有关
更新: 这是我使用的一段代码:
InputStream is = null;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("lastupdate", lastupdate));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(connection);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.d("HTTP", "HTTP: OK");
} catch (Exception e) {
Log.e("HTTP", "Error in http connection " + e.toString());
}