public class Person implements Serializable {
private String name;
private int age;
public Person() {
System.out.println("无参构造...");
}
public Person(String name, int age) {
this.name = name;
this.age = age;
System.out.println("有参构造...");
}
@Override
public String toString() {
return "Person{" +
"name='" + name + "\'" +
", age='" + age + "\'"
"}";
}
}
public class SerializableTest {
public static void main(String[] args) throws IOException, ClassNotFoundException {
Person person = new Person("Lily", 20);
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("Person.txt"));
oos.writeObject(person);
oos.close();
}
}
public class DeserializableTest {
public static void main(String[] args) throws IOException, ClassNotFoundException {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("Person.txt"));
Pesron person = (Person)ois.readObject(ois);
System.out.println(person);
}
}
public class CustomExternal implements Externalizable {
private String name;
private int code;
public CustomExternal() {
System.out.println("无参构造...");
}
public CustomExternal(String name, int code) {
this.name = name;
this.code = code;
System.out.println("有参构造...");
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
System.out.println("执行writeExternal()方法...");
out.writeObject(name);
out.writeInt(code);
}
@Override
public void readExternal(ObjectInput in) throws IOException,ClassNotFoundException {
System.out.println("执行readExternal()方法...");
name = (String) in.readObject();
code = in.readInt();
}
@Override
public String toString() {
return "类:" + name + code;
}
public static void main(String[] args) throws IOException, ClassNotFoundException {
CustomExternal custom = new CustomeExternal("oxford", 666);
System.out.println(custom);
// 序列化
ObjectOutputStream out = new ObjectOutputStream(new FileInputStream("oxford.txt"));
System.out.println("序列化对象...");
out.writeObject(custom);
out.close();
// 反序列化
ObjectInputStream in = new ObjectInputStream(new FileInputStream("oxford.txt"));
System.out.println("反序列化对象...");
custom = (CustomExternal) in.readObject();
System.out.println(custom);
in.close();
}
}
有参构造...
类:oxford666
序列化对象...
执行writeExternal()方法...
反序列化对象...
无参构造...
执行readExternal()方法...
类:oxford666
public final Object readObject()
throws IOException, ClassNotFoundException
{
if (enableOverride) {
return readObjectOverride();
}
int outerHandle = passHandle;
try {
Object obj = readObject0(false);
handles.markDependency(outerHandle, passHandle);
ClassNotFoundException ex = handles.lookupException(passHandle);
if (ex != null) {
throw ex;
}
if (depth == 0) {
vlist.doCallbacks();
}
return obj;
} finally {
passHandle = outerHandle;
if (closed && depth == 0) {
clear();
}
}
}
private Object readObject0(boolean unshared) throws IOException {
boolean oldMode = bin.getBlockDataMode();
if (oldMode) {
int remain = bin.currentBlockRemaining();
if (remain > 0) {
throw new OptionalDataException(remain);
} else if (defaultDataEnd) {
throw new OptionalDataException(true);
}
bin.setBlockDataMode(false);
}
byte tc;
while ((tc = bin.peekByte()) == TC_RESET) {
bin.readByte();
handleReset();
}
depth++;
totalObjectRefs++;
try {
switch (tc) {
case TC_NULL:
return readNull();
case TC_REFERENCE:
return readHandle(unshared);
case TC_CLASS:
return readClass(unshared);
case TC_CLASSDESC:
case TC_PROXYCLASSDESC:
return readClassDesc(unshared);
case TC_STRING:
case TC_LONGSTRING:
return checkResolve(readString(unshared));
case TC_ARRAY:
return checkResolve(readArray(unshared));
case TC_ENUM:
return checkResolve(readEnum(unshared));
case TC_OBJECT:
return checkResolve(readOrdinaryObject(unshared));
case TC_EXCEPTION:
IOException ex = readFatalException();
throw new WriteAbortedException("writing aborted", ex);
case TC_BLOCKDATA:
case TC_BLOCKDATALONG:
if (oldMode) {
bin.setBlockDataMode(true);
bin.peek();
throw new OptionalDataException(
bin.currentBlockRemaining());
} else {
throw new StreamCorruptedException(
"unexpected block data");
}
case TC_ENDBLOCKDATA:
if (oldMode) {
throw new OptionalDataException(true);
} else {
throw new StreamCorruptedException(
"unexpected end of block data");
}
default:
throw new StreamCorruptedException(
String.format("invalid type code: %02X", tc));
}
} finally {
depth--;
bin.setBlockDataMode(oldMode);
}
}
private Object readOrdinaryObject(boolean unshared)
throws IOException
{
if (bin.readByte() != TC_OBJECT) {
throw new InternalError();
}
ObjectStreamClass desc = readClassDesc(false);
desc.checkDeserialize();
Class<?> cl = desc.forClass();
if (cl == String.class || cl == Class.class
|| cl == ObjectStreamClass.class) {
throw new InvalidClassException("invalid class descriptor");
}
Object obj;
try {
obj = desc.isInstantiable() ? desc.newInstance() : null;
} catch (Exception ex) {
throw (IOException) new InvalidClassException(
desc.forClass().getName(),
"unable to create instance").initCause(ex);
}
passHandle = handles.assign(unshared ? unsharedMarker : obj);
ClassNotFoundException resolveEx = desc.getResolveException();
if (resolveEx != null) {
handles.markException(passHandle, resolveEx);
}
if (desc.isExternalizable()) {
readExternalData((Externalizable) obj, desc);
} else {
readSerialData(obj, desc);
}
handles.finish(passHandle);
if (obj != null &&
handles.lookupException(passHandle) == null &&
desc.hasReadResolveMethod())
{
Object rep = desc.invokeReadResolve(obj);
if (unshared && rep.getClass().isArray()) {
rep = cloneArray(rep);
}
if (rep != obj) {
// Filter the replacement object
if (rep != null) {
if (rep.getClass().isArray()) {
filterCheck(rep.getClass(), Array.getLength(rep));
} else {
filterCheck(rep.getClass(), -1);
}
}
handles.setObject(passHandle, obj = rep);
}
}
return obj;
}
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