Android：如何在不使用 PHP 或任何网络服务的情况下将数据发送到远程数据库？

Posted 2023-02-24

【中文标题】Android：如何在不使用 PHP 或任何网络服务的情况下将数据发送到远程数据库？

【英文标题】：Android : How to send data to remote database without using PHP or any webservices?

【发布时间】：2013-03-22 06:56:24

【问题描述】：

我正在尝试将数据从 android 应用程序发送到 localhost mysql 数据库。我已经在 J​​AVA 中创建了应用程序，它工作正常。但是相同的代码在android中不起作用。什么问题。下面是安卓的代码。

public class MainActivity extends Activity

private Connection conn = null;  
private String url = "jdbc:mysql://localhost:3306/";
private String dbName = "testDB";
private String driver = "com.mysql.jdbc.Driver";  
private String userName = "root"; 
private String password = "";   
@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main); 
try 
        Class.forName(driver).newInstance();
        conn = DriverManager.getConnection(url+dbName,userName,password);
        System.out.println("Connected to the database");
        Statement stmt = conn.createStatement();
        String sql = "INSERT INTO test " +
                "VALUES ('XYZ')";
        stmt.executeUpdate(sql); 

        conn.close();
        System.out.println("Disconnected from database");
     catch (Exception e) 
        e.printStackTrace();
    

我收到以下错误：

04-01 12:52:31.114: W/System.err(910): java.sql.SQLException: Unable to connect to any hosts due to exception: java.net.SocketException: java.net.ConnectException: localhost/127.0.0.1:3306 - Connection refused
04-01 12:52:31.114: W/System.err(910): ** BEGIN NESTED EXCEPTION ** 
04-01 12:52:31.114: W/System.err(910): java.net.SocketException
04-01 12:52:31.114: W/System.err(910): MESSAGE: java.net.ConnectException: localhost/127.0.0.1:3306 - Connection refused
04-01 12:52:31.114: W/System.err(910): STACKTRACE:
04-01 12:52:31.124: W/System.err(910): java.net.SocketException: java.net.ConnectException: localhost/127.0.0.1:3306 - Connection refused
04-01 12:52:31.124: W/System.err(910):  at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:143)
04-01 12:52:31.124: W/System.err(910):  at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:225)
04-01 12:52:31.124: W/System.err(910):  at com.mysql.jdbc.Connection.createNewIO(Connection.java:1805)
04-01 12:52:31.124: W/System.err(910):  at com.mysql.jdbc.Connection.<init>(Connection.java:452)
04-01 12:52:31.124: W/System.err(910):  at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:411)
04-01 12:52:31.124: W/System.err(910):  at java.sql.DriverManager.getConnection(DriverManager.java:191)
04-01 12:52:31.124: W/System.err(910):  at java.sql.DriverManager.getConnection(DriverManager.java:226)
04-01 12:52:31.124: W/System.err(910):  at com.example.getip.MainActivity.onCreate(MainActivity.java:138)
04-01 12:52:31.124: W/System.err(910):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-01 12:52:31.124: W/System.err(910):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-01 12:52:31.124: W/System.err(910):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-01 12:52:31.124: W/System.err(910):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-01 12:52:31.124: W/System.err(910):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-01 12:52:31.124: W/System.err(910):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-01 12:52:31.124: W/System.err(910):  at android.os.Looper.loop(Looper.java:123)
04-01 12:52:31.124: W/System.err(910):  at android.app.ActivityThread.main(ActivityThread.java:4627)
04-01 12:52:31.124: W/System.err(910):  at java.lang.reflect.Method.invokeNative(Native Method)
04-01 12:52:31.124: W/System.err(910):  at java.lang.reflect.Method.invoke(Method.java:521)
04-01 12:52:31.134: W/System.err(910):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-01 12:52:31.134: W/System.err(910):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-01 12:52:31.134: W/System.err(910):  at dalvik.system.NativeStart.main(Native Method)
04-01 12:52:31.134: W/System.err(910): ** END NESTED EXCEPTION **
04-01 12:52:31.144: W/System.err(910):  at com.mysql.jdbc.Connection.createNewIO(Connection.java:1875)
04-01 12:52:31.144: W/System.err(910):  at com.mysql.jdbc.Connection.<init>(Connection.java:452)
04-01 12:52:31.144: W/System.err(910):  at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:411)
04-01 12:52:31.156: W/System.err(910):  at java.sql.DriverManager.getConnection(DriverManager.java:191)
04-01 12:52:31.156: W/System.err(910):  at java.sql.DriverManager.getConnection(DriverManager.java:226)
04-01 12:52:31.156: W/System.err(910):  at com.example.getip.MainActivity.onCreate(MainActivity.java:138)
04-01 12:52:31.156: W/System.err(910):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-01 12:52:31.156: W/System.err(910):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-01 12:52:31.156: W/System.err(910):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-01 12:52:31.156: W/System.err(910):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-01 12:52:31.156: W/System.err(910):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-01 12:52:31.156: W/System.err(910):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-01 12:52:31.156: W/System.err(910):  at android.os.Looper.loop(Looper.java:123)
04-01 12:52:31.156: W/System.err(910):  at android.app.ActivityThread.main(ActivityThread.java:4627)
04-01 12:52:31.156: W/System.err(910):  at java.lang.reflect.Method.invokeNative(Native Method)
04-01 12:52:31.164: W/System.err(910):  at java.lang.reflect.Method.invoke(Method.java:521)
04-01 12:52:31.164: W/System.err(910):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-01 12:52:31.164: W/System.err(910):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-01 12:52:31.164: W/System.err(910):  at dalvik.system.NativeStart.main(Native Method)

【问题讨论】：

是您的设备/模拟器和您在同一网络上的数据库

jdbc:mysql://localhost:3306/: 这里的 localhost 是指运行程序的系统，在你的情况下是 android 设备，你需要提供安装 mysql 的系统的 ip跨度>

@Atrix1987 我正在模拟器中尝试。

@CnchalShelar 我可以给这样的 ip jdbc:mysql://xx.xx.xx.xx:3306/:

@sachi 是的，但正如你所说，你在模拟器中尝试过，它与 Mysql 是否在同一个系统上？

【参考方案1】：

我通过将 localhost 替换为 10.0.2.2 解决了