我有下面的代码,它将一个列表存储到文件,然后存储到mysql blob列。是否可以从数据库中恢复该列表?
ArrayList<String> myList = new ArrayList<String>();
File tempFile = File.createTempFile("myFile.temp");
tempFile.deleteOnExit();
FileOutputStream fileOutputStream = new FileOutputStream(tempFile);
ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
objectOutputStream.writeUnshared(myList);
objectOutputStream.close();
String trailQuery = "INSERT INTO table (tempFile) VALUES (?)";
PreparedStatement preparedStatement = connection.prepareStatement(trailQuery);
preparedStatement.setObject(1, tempFile);
我试着读这个,但我得到一个filenotfoundexception
if (resultSet.next()) {
InputStream fileInputStream = resultSet.getBinaryStream("tempFile");
ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
File inner = (File) objectInputStream.readObject();
FileInputStream fileInputStreamInner = new FileInputStream(inner);
ObjectInputStream objectInputStreamInner = new ObjectInputStream(fileInputStreamInner);
ArrayList<String> myList = (ArrayList<String>) objectInputStreamInner.readObject();
System.out.println(myList.size());
}
例外
java.io.FileNotFoundException: \tmp\myFile.1708309680603860570.temp (The system cannot find the path specified)
1条答案
按热度按时间zour9fqk1#
正如@ejp提到的,java.io.file只不过是一个文件名的持有者。。。有错误的理解-所以文件的内容都不在那里。。。。