我尝试连接到我的API，并将一些JSON数据发布到数据库，我遵循this one 但有些如何，
Connection.connect(); //get Respone Message : Null
连接得到Null，但是我使用postman测试这个API，它工作，反复200 OK，我使用调试模式并且它在JSON中，URL是对的，请帮忙
更新：我发现this但是如果我添加Strick模式，它会显示大量错误，所以我试图在DoinBackGround中设置Click，但不确定我是否可以在后台使用click或不
更新：this工作，必须设置如下setcontentview，但数据没有发送到数据库，继续尝试......
调试模式：它停在int HttpResult = Connection.getResponseCode();而不是跳转到catch (IOException e) {继续尝试......
码
public void onClick(View v) {
HttpURLConnection Connection = null;
try {
StringBuilder sb = new StringBuilder();
JSONObject jsonObject = new JSONObject();
jsonObject.put("artist", artist.getText().toString());
jsonObject.put("weeksAtOne", week.getText().toString());
jsonObject.put("decade", year.getText().toString());
jsonObject.put("song", song.getText().toString());
String http = "http://36.224.137.68:3000/songs";
URL url = new URL(http);
Connection = (HttpURLConnection) url.openConnection();
Connection.setDoOutput(true);
Connection.setRequestMethod("POST");
Connection.setUseCaches(false);
Connection.setConnectTimeout(10000);
Connection.setReadTimeout(10000);
Connection.setRequestProperty("Content-Type", "application/json");
Connection.connect(); //null here
OutputStreamWriter out = new OutputStreamWriter(Connection.getOutputStream());
out.write(jsonObject.toString());
out.write(URLEncoder.encode(jsonObject.toString(), "UTF-8"));
out.flush();
out.close();
int HttpResult = Connection.getResponseCode();
if (HttpResult == HttpURLConnection.HTTP_OK) {
BufferedReader br = new BufferedReader(new InputStreamReader(
Connection.getInputStream(), "utf-8"));
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
br.close();
System.out.println("" + sb.toString());
} else {
System.out.println(Connection.getResponseMessage());
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}finally{
if(Connection!=null)
Connection.disconnect();
}
调试模式消息
this = {UploadJSON$1@18566}
v = {Button@18568} "android.widget.Button{3094c1bd VFED..C. ...P.... 272,364-448,460 #7f0d00f2 app:id/btUpload}"
Connection = {HttpURLConnectionImpl@18571} "com.android.okhttp.internal.http.HttpURLConnectionImpl:http://36.224.137.68:300 0/songs"
sb = {StringBuilder@18572} ""
jsonObject = {JSONObject@18573} " {"artist":"Yyyyyyy","weeksAtOne":"Ttttt","decade":"Hhhhh","song":"Ooooo"}"
http = {String@18574} "http://36.224.137.68:3000/songs"
url = {URL@18575} "http://36.224.137.68:3000/songs"
authority = {String@18585} "36.224.137.68:3000"
file = {String@18586} "/songs"
hashCode = 0
host = {String@18587} "36.224.137.68"
path = {String@18586} "/songs"
port = 3000
protocol = {String@18588} "http"
query = null
ref = null
streamHandler = {HttpHandler@18589}
userInfo = null
shadow$_klass_ = {Class@1635} "class java.net.URL"
shadow$_monitor_ = -1215925588
错误
com.addtw.aweino1 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.addtw.aweino1, PID: 4890
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
at libcore.io.IoBridge.connectErrno(IoBridge.java:154)
at libcore.io.IoBridge.connect(IoBridge.java:122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
at java.net.Socket.connect(Socket.java:882)
at com.android.okhttp.internal.Platform.connectSocket(Platform.java:174)
at com.android.okhttp.Connection.connect(Connection.java:1185)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:395)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:298)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:399)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:110)
at com.addtw.aweino1.UploadJSON$1.onClick(UploadJSON.java:74)
at android.view.View.performClick(View.java:5076)
at android.view.View$PerformClick.run(View.java:20279)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5910)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
答案 0 :(得分：0)
你可以尝试在connection.connect（）之前添加如下所示的Host属性吗？ urlConnection.setRequestProperty（“Host”，“36.224.137.68”）;