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[英]JAVA - Process HttpClient request for Content-Type: application/json
[英]Java HttpClient changing content-type?
我正在为我的Android手机构建一个小应用程序,使用非常基本的REST界面将文本消息转发到Web服务器。
我正在使用android 4.0.3 SDK。 我使用Django和Django restframework包在python中开发了webservice。 设置完全开箱即用。 基本上有一个端点接收包含消息信息(发送者,正文,日期)的JSON对象的POST。 我使用cURL使用以下命令测试了该服务:
curl -X POST -H 'Content-Type: application/json' --data '{"sender":"+xxxxxxxx", "body": "test", "send_date":"2011-03-20 16:32:02"}' http://[...]/messages.json
一切正常,我得到了预期的响应:
{"body": "test", "send_date": "2011-03-20T16:32:02", "id": 25, "sender": "+xxxxxxxxxx"}
现在我设置了Android应用程序。 它是一个简单的BroadcastReceiver子类,包含一个私有的AsyncTask类:
private class httpPost extends AsyncTask<String, Void, JSONObject> {
protected JSONObject doInBackground(String... args) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpParams myParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(myParams, 10000);
HttpConnectionParams.setSoTimeout(myParams, 10000);
String url = args[0];
String json=args[1];
JSONObject JSONResponse = null;
InputStream contentStream = null;
String resultString = "";
try {
HttpPost httppost = new HttpPost(url);
httppost.setHeader("Content-Type", "application/json");
httppost.setHeader("Accept", "application/json");
StringEntity se = new StringEntity(json);
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
httppost.setEntity(se);
for (int i=0;i<httppost.getAllHeaders().length;i++) {
Log.v("set header", httppost.getAllHeaders()[i].getValue());
}
HttpResponse response = httpclient.execute(httppost);
// Do some checks to make sure that the request was processed properly
Header[] headers = response.getAllHeaders();
HttpEntity entity = response.getEntity();
contentStream = entity.getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(contentStream,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
contentStream.close();
resultString = sb.toString();
}catch(Exception e){
e.printStackTrace();
}
Log.v("log", resultString);
return new JSONObject();
}
}
正如您所看到的,我刚刚开始熟悉Java和Android SDK,所以请耐心等待。 这个设置实际上在我构建的另一个应用程序中运行良好,可以将JSON字符串发送到Neo4J Web服务。
问题是,当我通过Android将消息发布到我的webservice时,在某些时候内容类型从'application / json'变为'application / json,application / json'。 header循环中的日志条目仍然为每个标头输出正确的值,但是,webservice返回以下错误消息:
{"error": "Unsupported media type in request 'application/json, application/json'."}
我很困惑,欢迎任何帮助。
改变这个:
StringEntity se = new StringEntity(json);
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
httppost.setEntity(se);
仅限于此:
httppost.setEntity(new StringEntity(json.toString(), HTTP.UTF_8));
简单 :
import org.apache.http.client.methods.HttpPost;
httppost.setEntity(new StringEntity(json.toString(), org.apache.http.entity.ContentType.APPLICATION_JSON));
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