Java 无法序列化哈希映射
我试图序列化一个Java 无法序列化哈希映射,java,android,serialization,Java,Android,Serialization,我试图序列化一个HashMap,但它抛出了NotSerializableException 我将HashMap声明为: HashMap<String, Profile> profiles = new HashMap<String, Profile>(); Profile.java 元素的初始化方式如下: Profile profile = new Profile() {{ name = "SOMETHING"; useSSL = false; /
HashMap
,但它抛出了NotSerializableException
我将HashMap
声明为:
HashMap<String, Profile> profiles = new HashMap<String, Profile>();
Profile.java
元素的初始化方式如下:
Profile profile = new Profile() {{
name = "SOMETHING";
useSSL = false;
// etc. etc.
}};
日志:
编辑
类在单独的文件中定义,而不是在内部类中定义Profile
- 下面是saveObject()和loadObject()方法
非静态嵌套类具有对其容器类的隐式引用。因此,序列化框架将尝试序列化您的MainActivity。最后,我能够解决我的问题 我将对象变量设置为:
Profile profile = new Profile() {{
name = "SOMETHING";
useSSL = false;
// etc. etc.
}};
所以我只是尝试在不使用双括号的情况下设置变量,如:
profile.name = " SOMETHING";
profile.useSSL = false;
// etc. etc.
我甚至不知道为什么会出现这个问题,但最后我已经解决了。如何编写HashMap?@Blackbelt通过objectOutput#writeObject(profiles)然后我刷新流我真的想知道为什么这个问题被否决,我就是不明白你能发布方法saveObject吗?你确定Profile不是
MainActivity
的内部类吗?如果是,则需要声明它为静态。否则,我看不出序列化框架试图序列化MainActivity
的原因。尝试从MainActivity发布更多代码。。。包含saveObjectIt是由于创建了一个内部类而导致问题的,该类具有对封闭对象的引用,该对象不可序列化。使用双括号本质上是Profile的一个匿名内部子类,即Profile不再严格属于Profile类型。也因为它是一个非静态的内部类,所以它有一个对其封闭对象的引用,这是不可序列化的;你应该避免。我曾在一些地方将其视为“整洁的技巧”,您通常应该将其视为:整洁的技巧,不适用于真正的代码(棘手的代码往往会导致棘手的bug)。“非静态内部”是一种重言式。
java.io.NotSerializableException: tk.microdroid.microirc.MainActivity
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at java.util.HashMap.writeObject(HashMap.java:1013)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1053)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at tk.microdroid.microirc.MainActivity.saveObject(MainActivity.java:168)
at tk.microdroid.microirc.MainActivity.saveDefaultProfiles(MainActivity.java:201)
at tk.microdroid.microirc.MainActivity.checkFirstStartup(MainActivity.java:70)
at tk.microdroid.microirc.MainActivity.onCreate(MainActivity.java:43)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
at android.app.ActivityThread.access$600(ActivityThread.java:127)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4448)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)
public Object loadObject(String name) {
try {
ObjectInputStream objectInput = new ObjectInputStream(openFileInput(name));
Object obj = objectInput.readObject();
objectInput.close();
Log.v("loadObject()", "Loading " + name + ".. | Type: " + obj.getClass().getName());
return obj;
} catch (Exception e) { Log.e("loadObject()", e.toString()); }
return null;
}
public void saveObject(Object obj, String name) {
try {
Log.v("saveObject()", "Saving " + name + ".. | Type: " + obj.getClass().getName());
ObjectOutputStream objectOutput = new ObjectOutputStream(openFileOutput(name, MODE_PRIVATE));
objectOutput.writeObject(obj);
objectOutput.flush();
objectOutput.close();
} catch (Exception e) { Log.e("saveObject()","Error", e); }
}
Profile profile = new Profile() {{
name = "SOMETHING";
useSSL = false;
// etc. etc.
}};
profile.name = " SOMETHING";
profile.useSSL = false;
// etc. etc.