java - Java套接字编程中的未知主机名

我有五个域服务器，我想在我的android应用程序中使用java套接字编程连接到该服务器。

这是我的服务器
    “ ANY1.g %%%%%%%%%。dk”
    “ ANY2.g %%%%%%%%%。dk”
    “ ANY3.g %%%%%%%%%。dk”
    “ ANY4.g %%%%%%%%%。dk”
    “ ANY5.g %%%%%%%%。dk”

因此，当我通过运行提示符中的ping命令ping到任何服务器时，它工作正常并得到响应。

但是，当我尝试使用此服务器创建套接字时，会显示“未知主机”错误。

这是我的代码：

try
{
    hostname = "ANY SERVER DOMAIN NAME";
    port = ANY;
    socket = new Socket(hostname, port);
    socket.setReceiveBufferSize(2048);
    socket.setKeepAlive(true);
    Log.e("SOCKET",socket.isConnected());
}
catch(Exception e)
{
    Log.e("ERROR",e.getMessage());
}

代码是否有问题或任何建议将被接受？

清单文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.siliconithub.android.greencall"
    android:versionCode="1"
    android:versionName="1.0" >

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.SEND_SMS" />

<supports-screens
    android:anyDensity="true"
    android:largeScreens="true"
    android:normalScreens="true"
    android:resizeable="true"
    android:smallScreens="true" />

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_app_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".GreenCall"
        android:label="@string/title_activity_green_call"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".RecentCallActivity"
        android:label="@string/title_activity_recentcall"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".RecentCallDetailActivity"
        android:label="@string/title_activity_recentcall_detail"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".FavouritesActivity"
        android:label="@string/title_activity_fovourites"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".ContactsActivity"
        android:label="@string/title_activity_contacts"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".ContactDetailsActivity"
        android:label="@string/title_activity_contactdetails"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".TelnetServerActivity"
        android:label="@string/title_activity_telnetserver"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".SettingActivity"
        android:label="@string/title_activity_setting"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.Black" >
    </activity>
    <activity
        android:name=".SearchContactsActivity"
        android:label="@string/title_activity_search_contacts"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>

    <service
        android:name=".UpdateStatusService"
        android:label="@string/title_service_update_status"
        android:icon="@drawable/ic_app_icon"
        android:enabled="true" />

    <receiver android:name=".PhoneStateBroadcastReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>
</application>
</manifest>

谢谢。

最佳答案

import java.net.Socket;
public class Main {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("%%%%.%%%%%.dk", PORT NUMBER);
            socket.setReceiveBufferSize(2048);
            socket.setKeepAlive(true);
            System.out.println("socket " + socket.isConnected());
        } catch (Exception e) {
            System.out.println("error " + e.getMessage());
        }
    }
}

这返回

socket true

在Java中（没有Android）。它也可以在Android中使用（sherpya已对其进行了测试-请参阅下面的评论）。我想您的权限有问题。你能告诉我们你的清单吗？