1.问题描述
可以通过浏览器连接web应用,但用android studio连接报错
2.代码如下
Android端
activity_main.xml:
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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:id="@+id/et_username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入用户名 " />
<EditText
android:id="@+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入密码" />
<Button
android:onClick="click1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="get"/>
<Button
android:onClick="click2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="post"/>
</LinearLayout>
MainActivity
private EditText username;
private EditText password;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
username = (EditText) findViewById(R.id.et_username);
password = (EditText) findViewById(R.id.et_password);
}
public void click1(View v) {
new Thread() {
@Override
public void run() {
super.run();
}
}.start();
try {
String name = username.getText().toString().trim();
String pwd = password.getText().toString().trim();
String path = "http://10.0.2.2:8080/login/loginServlet?username=" + name + "&password=" + pwd + "";
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
int code = conn.getResponseCode();
if (code == 200) {
showToast("连接成功");
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void click2(View v) {
}
public void showToast(final String content) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), content, Toast.LENGTH_LONG).show();
}
});
}
}
AndroidManifest.xml
package="com.example.administrator.myapplication1">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<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>
点击按钮后的日志
05-01 04:50:39.613 9826-9826/? I/art: Not late-enabling -Xcheck:jni (already on)
05-01 04:50:39.613 9826-9826/? W/art: Unexpected CPU variant for X86 using defaults: x86
05-01 04:50:39.911 9826-9826/com.example.administrator.myapplication1 W/System: ClassLoader referenced unknown path: /data/app/com.example.administrator.myapplication1-2/lib/x86
05-01 04:50:39.933 9826-9826/com.example.administrator.myapplication1 I/InstantRun: starting instant run server: is main process
05-01 04:50:40.140 9826-9826/com.example.administrator.myapplication1 W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
05-01 04:50:40.727 9826-9852/com.example.administrator.myapplication1 I/OpenGLRenderer: Initialized EGL, version 1.4
05-01 04:50:40.727 9826-9852/com.example.administrator.myapplication1 D/OpenGLRenderer: Swap behavior 1
05-01 04:50:40.727 9826-9852/com.example.administrator.myapplication1 W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
05-01 04:50:40.727 9826-9852/com.example.administrator.myapplication1 D/OpenGLRenderer: Swap behavior 0
05-01 04:50:40.896 9826-9826/com.example.administrator.myapplication1 W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
05-01 04:51:59.575 9826-9826/com.example.administrator.myapplication1 W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
05-01 04:52:02.649 9826-9826/com.example.administrator.myapplication1 D/NetworkSecurityConfig: No Network Security Config specified, using platform default
05-01 04:52:02.651 9826-9826/com.example.administrator.myapplication1 W/System.err: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1303)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:333)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
05-01 04:52:02.652 9826-9826/com.example.administrator.myapplication1 W/System.err: at java.net.Socket.connect(Socket.java:605)
at com.android.okhttp.internal.Platform.connectSocket(Platform.java:113)
at com.android.okhttp.Connection.connectSocket(Connection.java:196)
at com.android.okhttp.Connection.connect(Connection.java:172)
at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:367)
at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:130)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:329)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:246)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:405)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:521)
at com.example.administrator.myapplication1.MainActivity.click1(MainActivity.java:44)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
05-01 04:52:02.655 9826-9826/com.example.administrator.myapplication1 W/System.err: at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)