Java List序列化的实现

概述
java中的序列化与反序列化都要求对象实现Serializable接口(其实就是声明一下),而对于List这种动态改变的集合默认是不实现这个接口的,也就是不能直接序列化。但是数组是可以序列化的,所以我们只需要将List集合与数组进行转换就可以实现序列化与反序列化了。

序列化
Object对象

public class TestObject implements Serializable{

private String name;
private String address;

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}

}

实例化对象,加点数据,然后执行序列化

public class Test {

public static void main(String[] args)
{
//创建要序列化的集合对象
List<TestObject> list = new ArrayList<>();
//加数据
for (int i = 0; i < 5; i++)
{
TestObject testObject = new TestObject();
testObject.setName("MJJ-"+i);
testObject.setAddress("HangZhou");
list.add(testObject);
}

File file = new File("object.adt");
try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(file)))
{
//将List转换成数组
TestObject[] obj = new TestObject[list.size()];
list.toArray(obj);
//执行序列化存储
out.writeObject(obj);
}
catch (IOException e)
{
e.printStackTrace();
}
}
}


反序列化
public class Test {

public static void main(String[] args)
{
File file = new File("object.adt");
try (ObjectInputStream out = new ObjectInputStream(new FileInputStream(file)))
{
//执行反序列化读取
TestObject[] obj = (TestObject[]) out.readObject();
//将数组转换成List
List<TestObject> listObject = Arrays.asList(obj);
}
catch (IOException e)
{
e.printStackTrace();
}
catch (ClassNotFoundException e)
{
e.printStackTrace();
}
}
}


封装
利用泛型把序列化和反序列化的方法封装起来,方便使用。

工具类
public class StreamUtils {

/**
* 序列化,List
*/
public static <T> boolean writeObject(List<T> list,File file)
{
T[] array = (T[]) list.toArray();
try(ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(file)))
{
out.writeObject(array);
out.flush();
return true;
}
catch (IOException e)
{
e.printStackTrace();
return false;
}
}

/**
* 反序列化,List
*/
public static <E> List<E> readObjectForList(File file)
{
E[] object;
try(ObjectInputStream out = new ObjectInputStream(new FileInputStream(file)))
{
object = (E[]) out.readObject();
return Arrays.asList(object);
}
catch (IOException e)
{
e.printStackTrace();
}
catch (ClassNotFoundException e)
{
e.printStackTrace();
}
return null;
}
}


使用工具类
//序列化
StreamUtils.<TestObject>writeObject(list, new File("object.adt"));
//反序列化
List<TestObject> re = StreamOfByte.<TestObject>readObjectForList(new File("object.txt"));
---------------------
作者:M家杰
来源:CSDN
原文:https://blog.csdn.net/tyzlmjj/article/details/50332815
版权声明:本文为博主原创文章,转载请附上博文链接!

posted @ 2019-02-19 22:27  LZ太热  阅读(1499)  评论(0编辑  收藏  举报