如何序列化 ObservableList [英] How to serialize ObservableList

问题描述

我正在开发一个 javaFx 项目，我们必须使用 ObservableList 来添加 Listner.ObservableList 包括人的模型.但是我想通过序列化将整个 ObservableList 对象存储到一个文件中.但它给了我一个例外.我还在对象模型上实现了序列化，但没有运气.有没有序列化ObservableList的方法?

I am working on a javaFx project where we have to use ObservableList to add Listners. ObservableList includes Model of persons. But I want to store the whole ObservableList Object in a file through serialization. But it gives me an Exception. I also implimented Serialization on the object Model but no luck. Is there any method to serialize ObservableList?

package com.company.Model;

import javax.persistence.*;
import java.io.Serializable;

/**
 * Created by Sunny on 1/8/2016.
 */
@Entity
@Table(name = "Employee", schema = "", catalog = "PUBLIC")
public class EmployeeEntity implements Serializable {
    private String empId;
    private String empAddress;
    private String empNumber;
    private String empFirstName;
    private String empLastName;

    public EmployeeEntity(String empId, String empAddress, String empNumber, String empFirstName, String empLastName) {
        this.empId = empId;
        this.empAddress = empAddress;
        this.empNumber = empNumber;
        this.empFirstName = empFirstName;
        this.empLastName = empLastName;
    }

    public EmployeeEntity() {

    }

    @Id
    @Column(name = "emp_ID")
    public String getEmpId() {
        return empId;
    }

    public void setEmpId(String empId) {
        this.empId = empId;
    }

    @Basic
    @Column(name = "emp_address")
    public String getEmpAddress() {
        return empAddress;
    }

    public void setEmpAddress(String empAddress) {
        this.empAddress = empAddress;
    }

    @Basic
    @Column(name = "emp_number")
    public String getEmpNumber() {
        return empNumber;
    }

    public void setEmpNumber(String empNumber) {
        this.empNumber = empNumber;
    }

    @Basic
    @Column(name = "emp_firstName")
    public String getEmpFirstName() {
        return empFirstName;
    }

    public void setEmpFirstName(String empFirstName) {
        this.empFirstName = empFirstName;
    }

    @Basic
    @Column(name = "emp_lastName")
    public String getEmpLastName() {
        return empLastName;
    }

    public void setEmpLastName(String empLastName) {
        this.empLastName = empLastName;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        EmployeeEntity that = (EmployeeEntity) o;

        if (empId != null ? !empId.equals(that.empId) : that.empId != null) return false;
        if (empAddress != null ? !empAddress.equals(that.empAddress) : that.empAddress != null) return false;
        if (empNumber != null ? !empNumber.equals(that.empNumber) : that.empNumber != null) return false;
        if (empFirstName != null ? !empFirstName.equals(that.empFirstName) : that.empFirstName != null) return false;
        if (empLastName != null ? !empLastName.equals(that.empLastName) : that.empLastName != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = empId != null ? empId.hashCode() : 0;
        result = 31 * result + (empAddress != null ? empAddress.hashCode() : 0);
        result = 31 * result + (empNumber != null ? empNumber.hashCode() : 0);
        result = 31 * result + (empFirstName != null ? empFirstName.hashCode() : 0);
        result = 31 * result + (empLastName != null ? empLastName.hashCode() : 0);
        return result;
    }
}

序列化

 public void write(ObservableList<EmployeeEntity> personObservalble) {
        try {
            // write object to file
            FileOutputStream fos = new FileOutputStream("Objectsavefile.ser");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(personsObservable);
            oos.close();


        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

例外

java.io.NotSerializableException: com.sun.javafx.collections.ObservableListWrapper
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
    at FileWriter.write(FileWriter.java:14)
    at Main.main(Main.java:12)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Process finished with exit code 0

推荐答案

ObservableList 实现不是 Serializable(本质上没有合理的方法来定义序列化监听器的行为，并且根本不序列化侦听器与序列化具有相同数据的不可观察列表相同，我认为这是您在这里要做的.)假设您的 Person 类是 Serializable(并且实例实际上可以被序列化)，你可以这样做:

ObservableList implementations are not Serializable (Essentially there's no sensible way to define the behavior for serializing the listeners, and not serializing the listeners at all is just the same as serializing a non-observable list with the same data, which I think is what you want to do here.) Assuming your Person class is Serializable (and that instances can actually be serialized), you can do:

 public void write(ObservableList<EmployeeEntity> personObservalble) {
    try {
        // write object to file
        FileOutputStream fos = new FileOutputStream("Objectsavefile.ser");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(new ArrayList<EmployeeEntity>(personsObservable));
        oos.close();


    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

要读回它，你会这样做:

To read it back in, you would do:

ObjectInputStream ois = ... ;
List<EmployeeEntity> list = (List<EmployeeEntity>) ois.readObject();
personsObservable = FXCollections.observableList(list);

这是一个完整的测试.我运行了它并且它起作用了(我删除了持久性注释，因为我的测试环境中的类路径上没有 javax.persistence，但这应该没有区别).

Here is a complete test. I ran this and it worked (I removed the persistence annotations, as I didn't have javax.persistence on the classpath in my test environment, but that should make no difference).

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;

public class SerializeObservableListTest {

    public static void main(String[] args) throws IOException {
        EmployeeEntity bill = new EmployeeEntity("1000", "Seattle, WA", "1000", "Bill", "Gates");
        EmployeeEntity tim = new EmployeeEntity("2000", "Mobile, AL", "2000", "Tim", "Cook");

        ObservableList<EmployeeEntity> staff = FXCollections.observableArrayList(bill, tim);

        Path temp = Files.createTempFile("employees", "ser");
        write(staff, temp);

        ObservableList<EmployeeEntity> listFromFile = read(temp);
        System.out.println("Lists equal? "+listFromFile.equals(staff));
    }

    private static void write(ObservableList<EmployeeEntity> employees, Path file) {
        try {

            // write object to file
            OutputStream fos = Files.newOutputStream(file);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(new ArrayList<EmployeeEntity>(employees));
            oos.close();


        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private static ObservableList<EmployeeEntity> read(Path file) {
        try {
            InputStream in = Files.newInputStream(file);
            ObjectInputStream ois = new ObjectInputStream(in);
            List<EmployeeEntity> list = (List<EmployeeEntity>) ois.readObject() ;

            return FXCollections.observableList(list);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return FXCollections.emptyObservableList();
    }
}

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