大家都知道Serializable是一个mark interface,告诉JVM这个对象可以被转换成二进制流来传输.
Serializable 在我们实现这个接口的时候,我们可以使用4个私有方法来控制序列化的过程:
我们来看一个例子:
public class FooImpl implements java.io.Serializable{
private String message;
public String getFoo() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
private void writeObject(java.io.ObjectOutputStream out) throws IOException {
System.out.println("writeObject invoked");
out.writeObject(this.message == null ? "hohohahaha" : this.message);
}
private void readObject(java.io.ObjectInputStream in) throws IOException,
ClassNotFoundException {
System.out.println("readObject invoked");
this.message = (String) in.readObject();
}
private Object writeReplace() throws ObjectStreamException {
System.out.println("writeReplace invoked");
return this;
}
private Object readResolve() throws ObjectStreamException {
System.out.println("readResolve invoked");
return this;
}
public Object serialize() throws IOException, ClassNotFoundException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(this);
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readObject();
}
public static void main(String[] args) throws IOException,
ClassNotFoundException {
FooImpl fooimpl = new FooImpl();
fooimpl.serialize();
}
}
public class FooImpl implements java.io.Serializable{
private String message;
public String getFoo() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
private void writeObject(java.io.ObjectOutputStream out) throws IOException {
System.out.println("writeObject invoked");
out.writeObject(this.message == null ? "hohohahaha" : this.message);
}
private void readObject(java.io.ObjectInputStream in) throws IOException,
ClassNotFoundException {
System.out.println("readObject invoked");
this.message = (String) in.readObject();
}
private Object writeReplace() throws ObjectStreamException {
System.out.println("writeReplace invoked");
return this;
}
private Object readResolve() throws ObjectStreamException {
System.out.println("readResolve invoked");
return this;
}
public Object serialize() throws IOException, ClassNotFoundException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(this);
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readObject();
}
责任编辑：小草
