How to call java web service from android app?
Question
I've made simple web service where you have to provide your name. It will return "Hello "+your_Name.
At Server Side
myWebService.java
package pkg;
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebParam;
@WebService(serviceName = "myWebService")
public class myWebService {
@WebMethod(operationName = "hello")
public String hello(@WebParam(name = "name") String txt) {
return "Hello " + txt + " !";
}
}
At Client Side
Index.jsp
<%@page import="java.io.Writer"%>
<%@page import="org.json.JSONObject"%>
<%@page import="org.json.JSONArray"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="application/json; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="#">
<input type="text" name="t1">
<input type="submit" value="CLICK"><br>
</form>
</body>
</html>
<%-- start web service invocation --%><hr/>
<%
try {
pkg.MyWebService_Service service = new pkg.MyWebService_Service();
pkg.MyWebService port = service.getMyWebServicePort();
java.lang.String name = request.getParameter("t1");
java.lang.String result = port.hello(name);
out.write(result);
} catch (Exception ex)
{
}
%>
<%-- end web service invocation --%><hr/>
Output on Browser
So Web Service works fine when I call it from Browser. But problem occurs when I try to call it from Android.
build.gradle(Module: app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.example.akshay.httpclientdemo"
minSdkVersion 14
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/license.txt'
exclude 'META-INF/NOTICE'
exclude 'META-INF/NOTICE.txt'
exclude 'META-INF/notice.txt'
exclude 'META-INF/ASL2.0'
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation files('libs/httpclient-4.5.9.jar')
implementation files('libs/httpcore-4.4.11.jar')
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.akshay.httpclientdemo">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
**activity_main.xml**
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/t1"
android:layout_width="293dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/t2"
android:layout_width="289dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/t1" />
<Button
android:id="@+id/btn"
android:layout_width="132dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/t2" />
<ProgressBar
android:id="@+id/pBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity
{
Button btn;
EditText t1,t2;
ProgressBar pBar;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button)findViewById(R.id.btn);
t1=(EditText)findViewById(R.id.t1);
t2=(EditText)findViewById(R.id.t2);
pBar=(ProgressBar)findViewById(R.id.pBar);
pBar.setVisibility(View.GONE);
btn.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
pBar.setVisibility(View.VISIBLE);
new ExecuteTask().execute();
}
});
}
class ExecuteTask extends AsyncTask<String, Integer, String>
{
StringBuffer result;
@Override
protected String doInBackground(String... params) {
try
{
String url = "http://localhost:8080/WebClient/index.jsp?t1="+t1.getText().toString();
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
HttpResponse response = client.execute(request);
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = "";
result = new StringBuffer();
while ((line = rd.readLine()) != null)
{
result.append(line);
}
t2.setText(result.toString());
}
catch(Exception ex)
{
ex.printStackTrace();
}
return result.toString();
}
@Override
protected void onPostExecute(String result) {
pBar.setVisibility(View.GONE);
t2.setText(result.toString());
}
}
}
Output
After Clicking Button, I get
Error Log
07-18 14:13:06.423 1394-1422/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 9295997 , only wrote 9295920
07-18 14:13:06.442 8162-8185/com.example.akshay.httpclientdemo D/NetworkSecurityConfig: No Network Security Config specified, using platform default
07-18 14:13:06.452 8162-8185/com.example.akshay.httpclientdemo W/System.err: org.apache.http.conn.HttpHostConnectException: Connection to http://localhost:8080 refused
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:193)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:169)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:124)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:366)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:560)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:492)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:470)
07-18 14:13:06.453 8162-8185/com.example.akshay.httpclientdemo W/System.err: at com.example.akshay.httpclientdemo.MainActivity$ExecuteTask.doInBackground(MainActivity.java:64)
at com.example.akshay.httpclientdemo.MainActivity$ExecuteTask.doInBackground(MainActivity.java:50)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
at java.net.Socket.connect(Socket.java:586)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:124)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:149)
... 14 more
--------- beginning of crash
07-18 14:13:06.454 8162-8185/com.example.akshay.httpclientdemo E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.akshay.httpclientdemo, PID: 8162
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.StringBuffer.toString()' on a null object reference
at com.example.akshay.httpclientdemo.MainActivity$ExecuteTask.doInBackground(MainActivity.java:83)
at com.example.akshay.httpclientdemo.MainActivity$ExecuteTask.doInBackground(MainActivity.java:50)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
--------- beginning of system
07-18 14:13:06.455 1674-1829/system_process W/ActivityManager: Force finishing activity com.example.akshay.httpclientdemo/.MainActivity
07-18 14:13:06.462 1674-1829/system_process W/ActivityManager: Force finishing activity com.example.akshay.httpclientdemo/.MainActivity
Duplicate finish request for ActivityRecord{fc02510 u0 com.example.akshay.httpclientdemo/.MainActivity t92 f}
07-18 14:13:06.496 1310-2049/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 2691072
07-18 14:13:06.522 1310-1310/? E/EGL_emulation: tid 1310: eglCreateSyncKHR(1901): error 0x3004 (EGL_BAD_ATTRIBUTE)
07-18 14:13:06.667 1674-1691/system_process W/art: Long monitor contention with owner Binder:1674_2 (1686) at void com.android.server.am.ActivityManagerService.activityPaused(android.os.IBinder)(ActivityManagerService.java:6879) waiters=2 in void com.android.server.am.ActivityManagerService$3.handleMessage(android.os.Message) for 181ms
07-18 14:13:06.676 1674-2111/system_process W/art: Long monitor contention with owner Binder:1674_2 (1686) at void com.android.server.am.ActivityManagerService.activityPaused(android.os.IBinder)(ActivityManagerService.java:6879) waiters=3 in int com.android.server.am.ActivityManagerService.bindService(android.app.IApplicationThread, android.os.IBinder, android.content.Intent, java.lang.String, android.app.IServiceConnection, int, java.lang.String, int) for 188ms
07-18 14:13:06.811 6822-6839/com.example.akshay.todolist D/EGL_emulation: eglMakeCurrent: 0x997be600: ver 2 0 (tinfo 0xa6bf67e0)
07-18 14:13:06.846 8162-8178/com.example.akshay.httpclientdemo D/EGL_emulation: eglMakeCurrent: 0xb1a4e6a0: ver 2 0 (tinfo 0xa6b86880)
07-18 14:13:06.853 8162-8178/com.example.akshay.httpclientdemo D/OpenGLRenderer: endAllActiveAnimators on 0x99878300 (RippleDrawable) with handle 0x9953e240
07-18 14:13:06.872 1674-1752/system_process I/OpenGLRenderer: Initialized EGL, version 1.4
07-18 14:13:06.872 1674-1752/system_process D/OpenGLRenderer: Swap behavior 1
07-18 14:13:06.872 1674-1752/system_process W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
07-18 14:13:06.872 1674-1752/system_process D/OpenGLRenderer: Swap behavior 0
07-18 14:13:06.883 1674-1752/system_process D/EGL_emulation: eglCreateContext: 0x971032a0: maj 2 min 0 rcv 2
07-18 14:13:06.893 1674-1752/system_process D/EGL_emulation: eglMakeCurrent: 0x971032a0: ver 2 0 (tinfo 0x97d9b700)
07-18 14:13:06.902 1674-1752/system_process D/EGL_emulation: eglMakeCurrent: 0x971032a0: ver 2 0 (tinfo 0x97d9b700)
07-18 14:13:07.163 1394-1422/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 9331460 , only wrote 9331200
Not supplying enough data to HAL, expected position 9331210 , only wrote 9331200
07-18 14:13:07.181 1394-1422/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 9332030 , only wrote 9331920
07-18 14:13:07.432 1674-4893/system_process I/WindowManager: Destroying surface Surface(name=com.example.akshay.httpclientdemo/com.example.akshay.httpclientdemo.MainActivity) called by com.android.server.wm.WindowStateAnimator.destroySurface:2016 com.android.server.wm.WindowStateAnimator.destroySurfaceLocked:882 com.android.server.wm.WindowState.removeLocked:1456 com.android.server.wm.WindowManagerService.removeWindowInnerLocked:2484 com.android.server.wm.WindowManagerService.removeWindowLocked:2442 com.android.server.wm.WindowManagerService.removeWindowLocked:2311 com.android.server.wm.WindowManagerService.removeWindow:2306 com.android.server.wm.Session.remove:202
07-18 14:13:09.582 1394-1423/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 9561758 , only wrote 9447120
07-18 14:13:23.586 1674-1758/system_process D/WifiNative-HAL: Failing getSupportedFeatureset because HAL isn't started
07-18 14:13:23.587 1674-1695/system_process E/BluetoothAdapter: Bluetooth binder is null
07-18 14:13:23.588 1674-1695/system_process E/BatteryStatsService: no controller energy info supplied
07-18 14:13:23.592 1674-1695/system_process E/KernelCpuSpeedReader: Failed to read cpu-freq: /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state (No such file or directory)
07-18 14:13:23.592 1674-1695/system_process E/KernelUidCpuTimeReader: Failed to read uid_cputime: /proc/uid_cputime/show_uid_stat (No such file or directory)
07-18 14:13:23.593 1674-1695/system_process E/BatteryStatsService: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0, 0, 0, 0, 0] mRxTimeMs=0 mEnergyUsed=0}
07-18 14:14:00.138 1674-1674/system_process I/EntropyMixer: Writing entropy...
07-18 14:14:17.212 1674-1692/system_process I/ProcessStatsService: Prepared write state in 39ms
1 answers
solution1
1 ACCPTED 2019-07-18 08:57:51
You're trying to connect to localhost. Localhost is the machine the code is running on. But your server isn't on your phone (even if using an emulator, the emulator is a VM- it counts as a separate machine). So its not connecting, and not getting any data. Use the real url/ip address.
You also need to account for the case of a connection not working for some reason (for example, the server is down) and try to handle it more gracefully than a crash. Your problem here is that you depend on result being non-null in the return of doInBackground. You can fix this by moving return result.toString into the try block, and putting return null where you have it now.
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