带 JDBC 的 Gluon 示例项目在 iOS 设备上不起作用

Question

我有简单的 Gluon + JDBC 代码。 我可以在 Android 设备上连接此代码，但不能在 Ipad 上连接。

我的 build.gradle；

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'org.javafxports:jfxmobile-plugin:1.0.6'
    }
}

apply plugin: 'org.javafxports.jfxmobile'

repositories {
    jcenter()
}
dependencies {
    compile 'mysql:mysql-connector-java:5.0.2'
    iosRuntime 'mysql:mysql-connector-java:5.0.2'
}

mainClassName = 'com.mtt8.version15'

jfxmobile {
    android {
        manifest = 'src/android/AndroidManifest.xml'
        packagingOptions {
            exclude 'META-INF/INDEX.LIST'
        }

        ios {
            infoPList = file('src/ios/Default-Info.plist')
            forceLinkClasses = ['com.mtt8.**.*', 'com.mysql.**.*']
        }
    }
}

这里是 JavaCode：

private static final String serverIP="192.168.3.188";
    private static final String DB_DRIVER = "com.mysql.jdbc.Driver";
    private static final String DB_CONNECTION = "jdbc:mysql://192.168.3.188:3306/kasse_sql?useUnicode=true&characterEncoding=UTF-8";
    private static final String DB_USER = "root";
    private static final String DB_PASSWORD = "MYPASSWORD";

    public static Connection connection = null;
    public static Statement statement = null;
    public static String SQL = null;

    public static PreparedStatement pst = null;


    public static Connection getDBConnection(){

        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        try {
            //connection = DriverManager.getConnection(DB_CONNECTION, DB_USER, DB_PASSWORD);
            connection = DriverManager.getConnection("jdbc:mysql://192.168.3.188:3306/kasse_sql?user=root&password=MYPASSWORD&useUnicode=true&characterEncoding=UTF-8");
            msg.setText("Connection is OK");
            return  connection;
        } catch (SQLException e) {
            e.printStackTrace();
            msg.setText("Dont Connection");
        }

        return connection;
    }

正如我所说，此代码适用于 Android，但不适用于我的 Ipad。

./gradlew launchIOSDevice

后出现以下错误

java.sql.SQLException: Unsupported character encoding 'Cp1252'
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
    at com.mysql.jdbc.Buffer.readString(Buffer.java:430)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2823)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:812)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3269)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1182)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2644)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at java.sql.DriverManager.getConnection(DriverManager.java:179)
    at java.sql.DriverManager.getConnection(DriverManager.java:144)
    at com.mtt8.version15.getDBConnection(version15.java:58)
    at com.mtt8.version15.start(version15.java:32)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
    at com.sun.javafx.application.LauncherImpl$$Lambda$9.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl$$Lambda$7.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
    at com.sun.javafx.application.PlatformImpl$$Lambda$19.run(Unknown Source)
    at java.security.AccessController.doPrivileged(AccessController.java:52)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
    at com.sun.javafx.application.PlatformImpl$$Lambda$6.run(Unknown Source)
    at org.robovm.apple.uikit.UIApplication.main(Native Method)
    at org.robovm.apple.uikit.UIApplication.main(UIApplication.java:384)
    at org.javafxports.jfxmobile.ios.BasicLauncher.main(BasicLauncher.java:115)
IOSWindowSystemInterface : setSwapInterval unimp
setSwapInterval(1)
ES2ResourceFactory: Prism - createStockShader: FillPgram_Color.frag
ES2ResourceFactory: Prism - createStockShader: Texture_Color.frag
ES2ResourceFactory: Prism - createStockShader: Solid_TextureRGB.frag
IOSWindowSystemInterface : setSwapInterval unimp
setSwapInterval(0)

我尝试了不同的连接字符串，但结果是一样的。

谁能告诉我为什么我的代码不能在 Ipad 上运行？

谢谢 埃尔坎卡普兰

Answer 1

连接器中使用的编码似乎发生了变化。

这是适用于 iOS 的最新版本：

dependencies {
    compile 'mysql:mysql-connector-java:3.1.12'
}

对于较新的版本（3.1.13+），我发现与您看到的相同的异常：

java.sql.SQLException: Unsupported character encoding 'Cp1252'.
at com.mysql.jdbc.StringUtils.getBytes(StringUtils.java)

最后，您的build.gradle 文件有错字：

jfxmobile {
    android {
        manifest = 'src/android/AndroidManifest.xml'
        packagingOptions {
            exclude 'META-INF/INDEX.LIST'
        }
        // typo!! iOS should be outside android!
        ios {
            infoPList = file('src/ios/Default-Info.plist')
            forceLinkClasses = ['com.mtt8.**.*', 'com.mysql.**.*']
        }
    }

}

确保这是您设置选项的方式：

jfxmobile {
    android {
        manifest = 'src/android/AndroidManifest.xml'
        packagingOptions {
            exclude 'META-INF/INDEX.LIST'
        }
    }

    ios {
        forceLinkClasses = [ 'com.gluonhq.**.*', 'com.mysql.**.*']
        infoPList = file('src/ios/Default-Info.plist')
    }
}