关于java：Android将发布数据发送到webservice

Android sending post data to webservice

本问题已经有最佳答案，请猛点这里访问。

嗨，我正在尝试将数据发送到Web服务

String url ="https://www.myurl.com";

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

URL urlobj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) urlobj.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

String urlParameters = GenerateUrlParameters(data);

con.setDoOutput(true);
con.setDoInput(true);

Log.i("test","hit1");

DataOutputStream wr = new DataOutputStream(con.getOutputStream());

Log.i("test","hit2");

wr.writeBytes(urlParameters);

wr.flush();
wr.close();

Hit1被击中，但它在下一行失败并且没有击中hit2。我究竟做错了什么？

我的logcat

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

10-18 09:17:33.302: D/gralloc_goldfish(2228): Emulator without GPU emulation detected.
10-18 09:17:33.322: W/TextLayoutCache(2228): computeValuesWithHarfbuzz -- need to force to single run
10-18 09:17:37.862: I/test(2228): hit1
10-18 09:17:37.872: D/AndroidRuntime(2228): Shutting down VM
10-18 09:17:37.872: W/dalvikvm(2228): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
10-18 09:17:37.912: E/AndroidRuntime(2228): FATAL EXCEPTION: main
10-18 09:17:37.912: E/AndroidRuntime(2228): java.lang.IllegalStateException: Could not execute method of the activity
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.view.View$1.onClick(View.java:3039)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.view.View.performClick(View.java:3480)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.view.View$PerformClick.run(View.java:13983)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.os.Handler.handleCallback(Handler.java:605)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.os.Handler.dispatchMessage(Handler.java:92)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.os.Looper.loop(Looper.java:137)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.app.ActivityThread.main(ActivityThread.java:4340)
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.lang.reflect.Method.invokeNative(Native Method)
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.lang.reflect.Method.invoke(Method.java:511)
10-18 09:17:37.912: E/AndroidRuntime(2228): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-18 09:17:37.912: E/AndroidRuntime(2228): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-18 09:17:37.912: E/AndroidRuntime(2228): at dalvik.system.NativeStart.main(Native Method)
10-18 09:17:37.912: E/AndroidRuntime(2228): Caused by: java.lang.reflect.InvocationTargetException
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.lang.reflect.Method.invokeNative(Native Method)
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.lang.reflect.Method.invoke(Method.java:511)
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.view.View$1.onClick(View.java:3034)
10-18 09:17:37.912: E/AndroidRuntime(2228): ... 11 more
10-18 09:17:37.912: E/AndroidRuntime(2228): Caused by: android.os.NetworkOnMainThreadException
10-18 09:17:37.912: E/AndroidRuntime(2228): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084)
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
10-18 09:17:37.912: E/AndroidRuntime(2228): at java.net.InetAddress.getAllByName(InetAddress.java:220)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:71)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:460)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:432)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:188)
10-18 09:17:37.912: E/AndroidRuntime(2228): at libcore.net.http.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:280)
10-18 09:17:37.912: E/AndroidRuntime(2228): at dk.example.epaypayment.EpayHttpRequest.MakePayment(EpayHttpRequest.java:53)
10-18 09:17:37.912: E/AndroidRuntime(2228): at dk.example.epaypayment.MainActivity.sendMessage(MainActivity.java:37)
10-18 09:17:37.912: E/AndroidRuntime(2228): ... 14 more
10-18 09:22:38.232: I/Process(2228): Sending signal. PID: 2228 SIG: 9

相关讨论

使用参数调用sendPostRequest(String username, String pass)方法。您可以从UI线程调用此方法，该请求将从另一个线程发送(AsyncTask已嵌入)。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

private void sendPostRequest(String givenUsername, String givenPassword) {

class SendPostReqAsyncTask extends AsyncTask<String, Void, String> {

@Override
protected String doInBackground(String... params) {
String paramUsername = params[0];
String paramPassword = params[1];

System.out.println("*** doInBackground ** paramUsername"
+ paramUsername +" paramPassword :" + paramPassword);

HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(
"http://lib-dm.process9.com/libertydm/ValidateUserHandler.ashx");// replace with your url
httpPost.addHeader("Content-type",
"application/x-www-form-urlencoded");
BasicNameValuePair usernameBasicNameValuePair = new BasicNameValuePair(
"UserId", paramUsername); // Make your own key value pair
BasicNameValuePair passwordBasicNameValuePAir = new BasicNameValuePair(
"Password", paramPassword);// make your own key value pair

// You can add more parameters like above

List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();
nameValuePairList.add(usernameBasicNameValuePair);
nameValuePairList.add(passwordBasicNameValuePair);

try {
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(
nameValuePairList);
httpPost.setEntity(urlEncodedFormEntity);

try {
HttpResponse httpResponse = httpClient
.execute(httpPost);
InputStream inputStream = httpResponse.getEntity()
.getContent();
InputStreamReader inputStreamReader = new InputStreamReader(
inputStream);
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
StringBuilder stringBuilder = new StringBuilder();
String bufferedStrChunk = null;
while ((bufferedStrChunk = bufferedReader.readLine()) != null) {
stringBuilder.append(bufferedStrChunk);
}

return stringBuilder.toString();

} catch (ClientProtocolException cpe) {
System.out
.println("First Exception coz of HttpResponese :"
+ cpe);
cpe.printStackTrace();
} catch (IOException ioe) {
System.out
.println("Second Exception coz of HttpResponse :"
+ ioe);
ioe.printStackTrace();
}

} catch (UnsupportedEncodingException uee) {
System.out
.println("An Exception given because of UrlEncodedFormEntity argument :"
+ uee);
uee.printStackTrace();
}
return null;
}

@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
}
}

SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
sendPostReqAsyncTask.execute(givenUsername, givenPassword);
}

尝试实现此代码，它应该工作。
如果您的Android版本高于4.0，那么您将不得不强制使用Asyn Task，因此该http请求不会在主线程上运行。否则应用程序将崩溃。
如果应用程序使用HTTPGET或HTTPPOST方法并且正在主线程上运行，它将崩溃。 Asyn TAsk是解决方案。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

HttpClient client = new DefaultHttpClient();
HttpResponse response;
JSONObject json=new JSONObject();
HttpPost post = new HttpPost(url1);

try {
json.put("Key","your value");
json.put("Key","Value");

StringEntity stringEntity = new StringEntity(json.toString());

stringEntity.setContentEncoding("UTF-8");
stringEntity.setContentType("application/json");
post.setEntity(stringEntity);

response = client.execute(post);
Log.e("RESPONSE", response.toString());
String responseBody = EntityUtils
.toString(response.getEntity());
res= responseBody.toString();

Log.e("RESPONSE BODY", responseBody);

好吧，我建议使用HttpClient在更高的抽象中做到这一点。

1
2
3
4
5

DefaultHttpClient httpClient = null;

HttpParams my_httpParams = new BasicHttpParams();

httpClient = new DefaultHttpClient(my_httpParams);

然后发送

1
2
3
4
5
6
7
8
9
10
11
12
13
14

HttpPost httpPost = new HttpPost(stringUri);
httpPost.setHeader("Content-type","application/x-www-form-urlencoded");
httpPost.setHeader("charset","utf-8");

if (!TextUtils.isEmpty(someStringToSend)) {
httpPost.setEntity(new StringEntity(someStringToSend, HTTP.UTF_8));
}

HttpResponse responsePOST = httpClient.execute(httpPost);
HttpEntity resEntity = responsePOST.getEntity();

if (resEntity != null) {
response = EntityUtils.toString(resEntity, HTTP.UTF_8);
}

我没有测试它但应该工作。