Java-Java.io.NotSerializableException:net.sourceforge.jtds.jdbc.JtdsConnection
我想分享一节课,从一个活动到另一个活动。我什么都试过了,到处都找遍了,但解决不了我的问题。最重要的是,我必须使用BusinessLogic作为整个应用程序的控制类。每个变量、方法都在其中。。谁能帮帮我吗Java-Java.io.NotSerializableException:net.sourceforge.jtds.jdbc.JtdsConnection,java,android,sql,serializable,Java,Android,Sql,Serializable,我想分享一节课,从一个活动到另一个活动。我什么都试过了,到处都找遍了,但解决不了我的问题。最重要的是,我必须使用BusinessLogic作为整个应用程序的控制类。每个变量、方法都在其中。。谁能帮帮我吗 public void ConnectSQL() { StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadP
public void ConnectSQL() {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver");
con = DriverManager.getConnection("jdbc:jtds:sqlserver://192.168.3.10;databaseName=hungary;user=stockiduser;password=Berwin1559;loginTimeout=5;socketTimeout=5");
KapcsolatAllasKijelzes(false);
} catch (Exception e) {
KapcsolatAllasKijelzes(true);
}
}
此方法位于名为BusinessLogic的类中。。。
以下是主要活动代码:
Intent intent=new Intent(this, Kiszedes.class);
intent.putExtra("bl",bl);
startActivity(intent);
Kiszedes.class是目标活动:
BusinessLogic bl = (BusinessLogic) getIntent().getSerializableExtra("bl");
下面是LogCat所说的:
proba.diszpo E/AndroidRuntime: FATAL EXCEPTION: main
Process: proba.diszpo, PID: 11721
java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = proba.diszpo.BusinessLogic)
at android.os.Parcel.writeSerializable(Parcel.java:1526)
at android.os.Parcel.writeValue(Parcel.java:1474)
at android.os.Parcel.writeArrayMapInternal(Parcel.java:723)
at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1408)
at android.os.Bundle.writeToParcel(Bundle.java:1133)
at android.os.Parcel.writeBundle(Parcel.java:763)
at android.content.Intent.writeToParcel(Intent.java:8660)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3154)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1518)
at android.app.Activity.startActivityForResult(Activity.java:4226)
at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:77)
at android.app.Activity.startActivityForResult(Activity.java:4185)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
at android.app.Activity.startActivity(Activity.java:4509)
at android.app.Activity.startActivity(Activity.java:4477)
at proba.diszpo.MainActivity.onClick(MainActivity.java:177)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22641)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
Caused by: java.io.NotSerializableException: net.sourceforge.jtds.jdbc.JtdsConnection
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1224)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1584)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1549)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1472)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1218)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at android.os.Parcel.writeSerializable(Parcel.java:1521)
at android.os.Parcel.writeValue(Parcel.java:1474)
at android.os.Parcel.writeArrayMapInternal(Parcel.java:723)
at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1408)
at android.os.Bundle.writeToParcel(Bundle.java:1133)
at android.os.Parcel.writeBundle(Parcel.java:763)
at android.content.Intent.writeToParcel(Intent.java:8660)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3154)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1518)
at android.app.Activity.startActivityForResult(Activity.java:4226)
at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:77)
at android.app.Activity.startActivityForResult(Activity.java:4185)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
at android.app.Activity.startActivity(Activity.java:4509)
at android.app.Activity.startActivity(Activity.java:4477)
at proba.diszpo.MainActivity.onClick(MainActivity.java:177)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22641)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
您的
BusinessLogic
类包含对JtdsConnection
对象的引用,该对象不可序列化。对于BusinessLogic
来说,它的所有成员(以及成员的成员等)都是可序列化的是不够的。还需要可序列化
由于JtdsConnection
不是您创建的类,因此无法使其可序列化。不管怎么说,你试图使这项工作的方式并不是真正正确的
我建议您拥有一个业务逻辑的全局实例,这样您就可以从任何活动/片段访问它
在我的项目中,我通常创建一个Conf
类,其中包含我需要的对象的static
实例。在您的情况下,您可以有如下内容:
public class Conf {
@Nullable
private static BusinessLogic businessLogic;
@NonNull
public static BusinessLogic getBusinessLogic() {
if (businessLogic == null) {
businessLogic = new BusinessLogic();
}
return businessLogic;
}
}
在您的活动中,您现在只需执行以下操作:BusinessLogic bl=Conf.getBusinessLogic()
非常感谢!解决了我的问题。:)