如何解决类反序列化-Jython和Java之间的区别
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,我遇到一个我无法解决的错误。
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)
错误在objFromDatabase = deSerializeJavaObjectFromDB(connection)
行,尤其是在deSerializedObject = objectIn.readObject()
上,错误如下:
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
好奇的事实是,如果将frame = MyFrame()
行替换为frame = JFrame()
,则该函数可以正确地序列化而不会出错。
反序列化函数似乎不接受python类(反过来扩展了JFrame)。
我应该怎么做以jython语言反序列化我的MyFrame
类?预先感谢!
解决方法
您需要使用org.python.util.PythonObjectInputStream
而不是java.io.ObjectInputStream
。
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