qq_37174526
Liu Zhian
2017-12-21 12:32

java socket对象流输出时序列化的问题?

5
  • java
  • 对象
  • socket

我现在需要服务端去查询数据库,得到一个Enumeration<>对象,然后该对象通过objetctOutputStream的对象传给客户端,为了序列化,我写了一个NetTransfer类。代码如下

 public class NetTransfer implements Serializable {
 Object obj; 

    public Object getObj() {
        return obj;
    }

    public void setObj(Object obj) {
        this.obj = obj;
    }
 }

服务端代码如下:

 public static void getAllUser()
    {
        try
        {
        //服务器开始在数据库查询
        Vector<User> userVec=new Vector<User>();
        rSet=stmt.executeQuery("select * from userdata");
        while(rSet.next())
        {
        //以下只是我的程序中有不同类型的人,此处为多态
            switch (rSet.getString("role")) {
            case "administrator":
                userVec.add(new Administrator(rSet.getString("name"), rSet.getString("password"), rSet.getString("role")));
                break;
            case "operator":
                userVec.add(new Operator(rSet.getString("name"), rSet.getString("password"), rSet.getString("role")));
                break;
            case "browser":
                userVec.add(new Browser(rSet.getString("name"), rSet.getString("password"), rSet.getString("role")));
                break;
            default:
                break;
            }
        }

        Enumeration<User> e  = userVec.elements();
        NetTransfer allUsers=new NetTransfer();
        allUsers.setObj(e);

        ObjectOutputStream oos=new ObjectOutputStream(client.getOutputStream());
    /*异常提示此处没序列化*/  oos.writeObject(allUsers);
        oos.flush();
        //oos.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
    }

客户端

            Enumeration<User> allUsers=null;
            //服务器返回的信息
            ObjectInputStream ois=new ObjectInputStream(clientSocket.getInputStream());
            NetTransfer allUsersTransfer=new NetTransfer();
            allUsersTransfer=(NetTransfer)ois.readObject();
            allUsers=(Enumeration<User>)allUsersTransfer.getObj();
            //ois.close();
        } catch (Exception e) {
            e.printStackTrace();
            return allUsers;
        }
        return allUsers;
    }

对序列化不是很懂,求助

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