Question

我已经序列化了几个Data和java.lang.Integer个对象，但是在使用流Data读取数据对象时，如果java.lang.Integer对象读取的值为对象，则无法正确读取对象值正确的。

Data.java

public class Data implements Serializable{
    private Integer count ;
    public void setCount(Integer count ) {
        this.count = count;
        }
    public Integer getCount() {
        return count;
    }
}

SerializationTest.java

public class SerializationTest {
    public static void main(String[] args) {
        ObjectOutputStream oos = null;
        ObjectOutputStream oosD = null;
        ObjectInputStream ois = null;
        ObjectInputStream oisD = null;
        try{
            oos = new ObjectOutputStream(new FileOutputStream(new File("integer1.dat"),false));
            oosD = new ObjectOutputStream(new FileOutputStream(new File("Data1.dat"),false));
            Data data = new Data();
            data.setCount(10);
            oos.writeObject(new Integer(10));
            oosD.writeObject(data);

            data.setCount(100);
            oos.writeObject(new Integer(100));
            oosD.writeObject(data);

            data.setCount(1000);
            oos.writeObject(new Integer(1000));
            oosD.writeObject(data);
            oos.close();
            oosD.close();

            ois = new ObjectInputStream(new FileInputStream(new File("integer1.dat")));
            System.out.println("Integer output");
            System.out.println("First Object : "+ (Integer)ois.readObject());           
            System.out.println("Second Object : "+ (Integer)ois.readObject());  
            System.out.println("Third Object : "+ (Integer)ois.readObject());
            ois.close();
            System.out.println("Data output");
            oisD = new ObjectInputStream(new FileInputStream(new File("Data1.dat")));
            System.out.println("First Object : "+ ((Data)oisD.readObject()).getCount());            
            System.out.println("Second Object : "+ ((Data)oisD.readObject()).getCount());   
            System.out.println("Third Object : "+ ((Data)oisD.readObject()).getCount());
            oisD.close();
        }
        catch(IOException ioe){ ioe.printStackTrace();  }
        catch(Exception e){ e.printStackTrace();    }
    }
}

输出：

Integer output
First Object : 10
Second Object : 100
Third Object : 1000
Data output
First Object : 10
Second Object : 10
Third Object : 10

有人可以帮我解决Data对象的问题吗？

Answer 1

您每次都在序列化相同的数据实例。 java序列化存储对象的引用，并在您尝试多次存储同一实例时引用先前的存储（这解决了循环引用问题）。每次都创建一个新的数据实例。

Answer 2

试试这个：

        Data data = null;
        data = new Data();
        data.setCount(10);
        oos.writeObject(new Integer(10));
        oosD.writeObject(data);

        data = new Data();
        data.setCount(100);
        oos.writeObject(new Integer(100));
        oosD.writeObject(data);

        data = new Data();
        data.setCount(1000);
        oos.writeObject(new Integer(1000));
        oosD.writeObject(data);
        oos.close();
        oosD.close();

读取对象时Java对象序列化问题

2 个答案: