Question

vector可以存到redis中吗

List的实现类可以存到redis中吗

Answer 1

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;
}

}12345678910111213141516171819

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();
}
}
}123456789101112131415161718192021222324252627282930

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();
}
}
}12345678910111213141516171819202122

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;
}
}12345678910111213141516171819202122232425262728293031323334353637383940414243

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"));1234