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分布式session实现。基于Leopard Memcache接口实现，目前Leopard已实现基于Memcached、Redis两种实现。

There is a newer version: 0.9.12

package io.leopard.web.session;

import io.leopard.json.Json;

import java.util.Date;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Json序列化/反序列化.
 * 
 * @author 阿海
 * 
 */
public class JsonSerializer {

	private static final String SPLIT = ".class,";

	public static Object serialize(Object object) {
		if (object == null) {
			return null;
		}
		if (object instanceof String) {
			return object;
		}
		if (object instanceof Number) {
			return object;
		}
		if (object instanceof Date) {
			return object;
		}
		return JsonSerializer.toJson(object);
	}

	public static String toJson(Object obj) {
		String className = obj.getClass().getName();
		String json = Json.toJson(obj);
		String str = className + SPLIT + json;
		return str;
	}

	public static Object unserialize(Object object) {
		if (object == null) {
			return null;
		}
		if (!(object instanceof String)) {
			return object;
		}
		String jsonSerialize = (String) object;
		if (isSerialize(jsonSerialize)) {
			return toObject(jsonSerialize);
		}
		else {
			return object;
		}
	}

	/**
	 * 判断是否json序列化.
	 * 
	 * @param jsonSerialize
	 * @return
	 */
	private static boolean isSerialize(String jsonSerialize) {
		int index = jsonSerialize.indexOf(SPLIT);
		return index > -1;
	}

	public static Object toObject(String jsonSerialize) {
		if (jsonSerialize == null || jsonSerialize.length() == 0) {
			return null;
		}
		int index = jsonSerialize.indexOf(SPLIT);
		String className = jsonSerialize.substring(0, index);
		String json = jsonSerialize.substring(index + SPLIT.length());

		Class clazz = getClass(className);
		return Json.toObject(json, clazz);
	}

	private static Map> clazzCache = new ConcurrentHashMap>();

	protected static Class getClass(String className) {
		Class clazz = clazzCache.get(className);
		if (clazz != null) {
			return clazz;
		}
		try {
			clazz = Class.forName(className);
		}
		catch (ClassNotFoundException e) {
			throw new RuntimeException(e);
		}
		clazzCache.put(className, clazz);
		return clazz;
	}
}