类反序列化-Jython和Java之间的差异
我能够将自定义JFrame序列化到数据库中,并且我想对其进行反序列化类反序列化-Jython和Java之间的差异,java,serialization,jframe,deserialization,jython,Java,Serialization,Jframe,Deserialization,Jython,我能够将自定义JFrame序列化到数据库中,并且我想对其进行反序列化不幸的是,在所谓的反序列化过程中,我有一个无法解决的错误 import sys from java.io import * from java.lang import Class from java.sql import * from methods import * class MyFrame(JFrame): def __init__(self): self._title = 'Frame di
不幸的是,在所谓的反序列化过程中,我有一个无法解决的错误
import sys
from java.io import *
from java.lang import Class
from java.sql import *
from methods import *
class MyFrame(JFrame):
def __init__(self):
self._title = 'Frame di prova'
self.setTitle(self._title)
c = self.getContentPane()
self._insertN = JTextField(20)
nameLabelPane, nameFieldPane = incidentPanels(
JLabel("Nome"), [self._insertN])
firstBlock = (nameLabelPane, nameFieldPane)
firstPane = gridPane(firstBlock)
if self._title.startswith('Modifica'):
saveBtn = JButton('Modifica')
else:
saveBtn = JButton('Salva')
globalPane = JPanel()
gridBagger(globalPane, (firstPane, saveBtn))
c.add(JScrollPane(globalPane))
self.pack()
SQL_CREATE_TABLE = "create table if not exists serialized_java_objects (object_name varchar(1000), serialized_object blob)"
SQL_SERIALIZE_OBJECT = "INSERT INTO serialized_java_objects(object_name, serialized_object) VALUES (?, ?)"
SQL_DESERIALIZE_OBJECT = "SELECT serialized_object FROM serialized_java_objects limit 1"
def createTable(connection):
connection.createStatement().executeUpdate(SQL_CREATE_TABLE)
def serializeJavaObjectToDB(connection, objectToSerialize):
pstmt = connection.prepareStatement(SQL_SERIALIZE_OBJECT)
pstmt.setString(1, 'Frame di prova')
pstmt.setObject(2, objectToSerialize)
pstmt.executeUpdate()
pstmt.close()
def deSerializeJavaObjectFromDB(connection):
pstmt = connection.prepareStatement(SQL_DESERIALIZE_OBJECT)
rs = pstmt.executeQuery()
rs.next()
buf = rs.getBytes(1)
objectIn = None
if (buf != None):
objectIn = ObjectInputStream(ByteArrayInputStream(buf))
deSerializedObject = objectIn.readObject()
rs.close()
pstmt.close()
return deSerializedObject
def getMySqlConnection():
mysqlConn = None
mysqlLog_server = "localhost"
mysqlLog_username = "root"
mysqlLog_password = ""
mysqlLog_database = "tuttle"
properties = Properties()
properties.put("user", mysqlLog_username)
properties.put("password", mysqlLog_password)
url = "jdbc:mysql://" + mysqlLog_server + "/" + mysqlLog_database + \
"?user=" + mysqlLog_username + "&password=" + mysqlLog_password
mysqlConn = DriverManager.getConnection(url)
return mysqlConn
def main(args):
frame = MyFrame()
Class.forName("com.mysql.jdbc.Driver")
connection = getMySqlConnection()
createTable(connection)
serializeJavaObjectToDB(connection, frame)
objFromDatabase = deSerializeJavaObjectFromDB(connection)
objFromDatabase.setVisible(True)
if __name__ == '__main__':
main(sys.argv)
错误出现在行objFromDatabase=deSerializeJavaObjectFromDB(connection)
,特别是在deSerializedObject=objectIn.readObject()
上,如下所示:
Traceback (most recent call last):
File "provaSerializzazione.py", line 119, in <module>
main(sys.argv)
File "provaSerializzazione.py", line 113, in main
objFromDatabase = deSerializeJavaObjectFromDB(connection)
File "provaSerializzazione.py", line 74, in deSerializeJavaObjectFromDB
deSerializedObject = objectIn.readObject()
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at java.io.ObjectInputStream.resolveClass(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
java.lang.ClassNotFoundException: java.lang.ClassNotFoundException: org.python.proxies.__main__$MyFrame$3
回溯(最近一次呼叫最后一次):
文件“provaSerializzazione.py”,第119行,在
主(系统argv)
文件“provaSerializzazione.py”,第113行,主目录
objFromDatabase=反序列化JavaObjectFromDB(连接)
反序列化JavaObjectFromDB中的文件“Provaserializazione.py”,第74行
反序列化对象=objectIn.readObject()
位于java.net.URLClassLoader.findClass(未知源)
位于java.lang.ClassLoader.loadClass(未知源)
位于sun.misc.Launcher$AppClassLoader.loadClass(未知源)
位于java.lang.ClassLoader.loadClass(未知源)
位于java.lang.Class.forName0(本机方法)
位于java.lang.Class.forName(未知源)
位于java.io.ObjectInputStream.resolveClass(未知源)
位于java.io.ObjectInputStream.readNonProxyDesc(未知源)
位于java.io.ObjectInputStream.readClassDesc(未知源)
位于java.io.ObjectInputStream.ReadOrderinaryObject(未知源)
位于java.io.ObjectInputStream.readObject0(未知源)
位于java.io.ObjectInputStream.readObject(未知源)
位于java.io.ObjectInputStream.readObject(未知源)
在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处
位于sun.reflect.NativeMethodAccessorImpl.invoke(未知源)
在sun.reflect.DelegatingMethodAccessorImpl.invoke处(未知源)
位于java.lang.reflect.Method.invoke(未知源)
java.lang.ClassNotFoundException:java.lang.ClassNotFoundException:org.python.proxies.\u_umain\u_u$MyFrame$3
奇怪的是,如果将行frame=MyFrame()
替换为frame=JFrame()
函数将正确序列化,而不会出现错误反序列化函数似乎不接受python类(python类反过来扩展了JFrame)。
我应该如何用jython语言反序列化我的
MyFrame
类?提前谢谢 您需要使用org.python.util.PythonObjectInputStream
而不是java.io.ObjectInputStream
这似乎不是反序列化问题。看起来您的MyFrame类在类路径中不存在。@OnurBaştürk那么您建议我怎么做?我不使用Python。因此,我不知道如何将java对象导入python项目。也许你可以解释一下你的项目结构和导入机制,然后我会设法找到一种方法。让我先问一下。MyFrame是Java对象吗?我认为这并不是说可以将自定义JFrame对象序列化到数据库中。我认为自定义对象是MyFrame,对吗?数据库中的数据是什么样子的?它是JSON格式还是其他格式?数据库中的数据类型是BLOB
,因为它是一个序列化对象。它得救了,我为此感到自豪。该错误发生在反序列化时class MyFrame(JFrame)
是一个Python/Jython类,它扩展了Java的JFrame
类,这可能对(Java)反序列化程序没有吸引力。事实上,如果我用f=JFrame()
声明了一个JFrame eg,那么整个程序的执行就不会有问题了!但我需要班级的扩展。。。