java序列化（对象流）
序列化
目的：将对象保存到硬盘中，或者网络中传输对象机制：将Java对象转换为字节序列，序列可以保存硬盘，或网络传输代码：实现Serializable或者Externalizable接口序列化版本标识符：private static final long serialVersionUID注意：不能序列化static修饰的成员变量；对象中的任何成员变量必须实现Serializable接口
class Person implements Serializable {
private static final long serialVersionUID =
124213453255L;
private String name;
private int age;
public Person(String name,
int age) {
super();
this.name = name;
this.age = age;
}
@Override
public String
toString() {
return "Person [name=" + name +
", age=" + age +
"]";
}
}
对象流
ObjectOutputStream:将Java对象写入IO流(序列化Serialize)ObjectInputStream:从IO流中恢复Java对象注意：不能序列化static修饰的成员变量；对象中的任何成员变量必须实现Serializable接口
@Test
public void testObjectOutputStream() {
Person p1 =
new Person(
"张三",
20);
Person p2 =
new Person(
"李四",
20);
ObjectOutputStream oos =
null;
try {
oos =
new ObjectOutputStream(
new FileOutputStream(
"person.txt"));
oos.writeObject(p1);
oos.flush();
oos.writeObject(p2);
oos.flush();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (oos !=
null) {
try {
oos.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Test
public void testObjectInputStream() {
ObjectInputStream ois =
null;
try {
ois =
new ObjectInputStream(
new FileInputStream(
"person.txt"));
Person p1 = (Person)ois.readObject();
System.out.println(p1);
Person p2 = (Person)ois.readObject();
System.out.println(p2);
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (ois !=
null) {
try {
ois.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
Person [name=张三, age=20] Person [name=李四, age=20]
