160527、项目上线后session（远程session）

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import com.danga.MemCached.MemCachedClient;
/**
* 远程Session存放在Memcached缓存服务器里的Session
*/
public class CacheSessionProvider implements SessionProvider{
@Autowired
private MemCachedClient memCachedClient;
private int expiry = 30;//分钟
private static final String JSESSIONID = "JSESSIONID";
//放值
@Override
public void setAttribute(HttpServletRequest request,HttpServletResponse response, String name,
Serializable value) {
/* HttpSession session = request.getSession();//true Cookie JSESSIONID
session.setAttribute(name, value); */
//本地有一份
//另一份Memcached
Map<String,Serializable> session = new HashMap<String,Serializable>();
session.put(name, value);
//保存远程了
memCachedClient.set(getSessionId(request,response), session, expiry*60);
}
//取值
@SuppressWarnings("unchecked")
@Override
public Serializable getAttribute(HttpServletRequest request,HttpServletResponse response, String name) {
Map<String,Serializable> session = (Map<String, Serializable>) memCachedClient.get(getSessionId(request,response));
if(null != session){
return session.get(name);
}
return null;
}
@Override
public void logout(HttpServletRequest request,HttpServletResponse response) {
// TODO Auto-generated method stub
if(memCachedClient.keyExists(getSessionId(request, response))){
memCachedClient.delete(getSessionId(request, response));
}
//清理Cookie

}
@Override
public String getSessionId(HttpServletRequest request,HttpServletResponse response) {
//所有的Cookie
Cookie[] cookies = request.getCookies();
if(null != cookies && cookies.length > 0){
for(Cookie c : cookies){
if(JSESSIONID.equals(c.getName())){
return c.getValue();
}
}
}
//生成一个
String sessionId = UUID.randomUUID().toString().replaceAll("-", "");
Cookie cookie = new Cookie(JSESSIONID,sessionId);
cookie.setMaxAge(-1);
cookie.setPath("/");
response.addCookie(cookie);
return sessionId;
}
public void setExpiry(int expiry) {
this.expiry = expiry;
}
}
注意：平时开发的时候是本地session，上线后放在缓存里面，所以将httpsession缓存了cachesession。spring的配置文件中加上<bean id="sessionProvider" class="cn.itcast.common.web.session.CacheSessionProvider">
<property name="expiry" value="60"/>
</bean>