Java开发中序列化与反序列化起到的作用

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基本概念:
序列化是将对象状态转换为可保持或传输的格式的过程。与序列化相对的是反序列化,它将流转换为对象。这两个过程结合起来,可以轻松地存储和传输数据。


特别在网络传输中,它的作用显得尤为重要。我们可以把一个类实现序列化,然后在另一端通过反序列化可以得到该对象


例如:我们可以序列化一个对象,不过这个对象要实现序列化方法,并生成序列化号。


这是对一个对象进行序列化和反序列化的过程:

public static byte[] serializeObj(Object object){
if (object == null) {
throw new NullPointerException("Can't serialize null");
}
byte[] rv = null;
ByteArrayOutputStream bos = null;
ObjectOutputStream os = null;
try {
bos = new ByteArrayOutputStream();
os = new ObjectOutputStream(bos);
os.writeObject(object);
os.writeObject(null);
os.close();
bos.close();
rv = bos.toByteArray();
} catch (IOException e) {
throw new IllegalArgumentException("Non-serializable object", e);
} finally {
try {
if (os != null) {
os.flush();
os.close();
}
if (bos != null) {
bos.flush();
bos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return rv;
}
@SuppressWarnings("unchecked")
public static <T>T deserializeObj(byte[] in,Class<T> clazz) {
ByteArrayInputStream bis = null;
ObjectInputStream is = null;
try {
if (in != null) {
bis = new ByteArrayInputStream(in);
is = new ObjectInputStream(bis);
while (true) {
T o = (T) is.readObject();
if (o == null) {
break;
} else {
return o;
}
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (is != null) {
is.close();
}
if (bis != null) {
bis.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}  
下面是一个扩展(对集合的序列化和反序列化):
public static <T>byte[] serializeList(List<T> value ,Class<T> clazz) {
if (value == null) {
throw new NullPointerException("Can't serialize null");
}
byte[] rv = null;
ByteArrayOutputStream bos = null;
ObjectOutputStream os = null;
try {
bos = new ByteArrayOutputStream();
os = new ObjectOutputStream(bos);
for (T t : value) {
os.writeObject(t);
}
os.writeObject(null);
os.close();
bos.close();
rv = bos.toByteArray();
} catch (IOException e) {
throw new IllegalArgumentException("Non-serializable object", e);
} finally {
try {
if (os != null) {
os.flush();
os.close();
}
if (bos != null) {
bos.flush();
bos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return rv;
}
@SuppressWarnings("unchecked")
public static <T> List<T> deserializeList(byte[] in,Class<T> clazz) {
List<T> list = new ArrayList<T>();
ByteArrayInputStream bis = null;
ObjectInputStream is = null;
try {
if (in != null) {
bis = new ByteArrayInputStream(in);
is = new ObjectInputStream(bis);
while (true) {
T o = (T) is.readObject();
if (o == null) {
break;
} else {
list.add(o);
}
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (is != null) {
is.close();
}
if (bis != null) {
bis.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}  

来自:http://blog.csdn.net/u012516914/article/details/41009403
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