redis 分布式 session容器

分布式服务器，redis作为session共享的容器

1.redis的连接信息

redisip=xxx.xxx.xxx.xxxredisport=6379redispw=xxxxxxxxxxxredismaxIdle=100redisminIdle=10redismaxTotal=200

2.作为redis连接池，要引入额外的两个包

package com.easier.DB;import java.io.IOException;import java.util.Properties;import org.apache.log4j.LogManager;import org.apache.log4j.Logger;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;public class RedisPools {private static JedisPool jedisPool = null;static {Logger log = LogManager.getLogger(RedisPools.class);Properties properties = new Properties();try {properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("jdbc.properties"));} catch (IOException e) {e.printStackTrace();}JedisPoolConfig config = new JedisPoolConfig();// 连接耗尽时是否阻塞, false报异常,ture阻塞直到超时, 默认trueconfig.setBlockWhenExhausted(true);// 设置的逐出策略类名, 默认DefaultEvictionPolicy(当连接超过最大空闲时间,或连接数超过最大空闲连接数)config.setEvictionPolicyClassName("org.apache.commons.pool2.impl.DefaultEvictionPolicy");// 是否启用pool的jmx管理功能, 默认trueconfig.setJmxEnabled(true);// MBean ObjectName = new// ObjectName("org.apache.commons.pool2:type=GenericObjectPool,name=" +// "pool" + i); 默 认为"pool", JMX不熟,具体不知道是干啥的...默认就好.config.setJmxNamePrefix("pool");// 是否启用后进先出, 默认trueconfig.setLifo(true);// 最大空闲连接数, 默认8个config.setMaxIdle(Integer.parseInt(properties.getProperty("redismaxIdle")));// 最大连接数, 默认8个config.setMaxTotal(Integer.parseInt(properties.getProperty("redismaxTotal")));// 获取连接时的最大等待毫秒数(如果设置为阻塞时BlockWhenExhausted),如果超时就抛异常, 小于零:阻塞不确定的时间,// 默认-1config.setMaxWaitMillis(-1);// 逐出连接的最小空闲时间 默认1800000毫秒(30分钟)config.setMinEvictableIdleTimeMillis(1800000);// 最小空闲连接数, 默认0config.setMinIdle(Integer.parseInt(properties.getProperty("redisminIdle")));// 每次逐出检查时 逐出的最大数目 如果为负数就是 : 1/abs(n), 默认3config.setNumTestsPerEvictionRun(3);// 对象空闲多久后逐出, 当空闲时间>该值 且 空闲连接>最大空闲数// 时直接逐出,不再根据MinEvictableIdleTimeMillis判断 (默认逐出策略)config.setSoftMinEvictableIdleTimeMillis(1800000);// 在获取连接的时候检查有效性, 默认falseconfig.setTestOnBorrow(false);// 在空闲时检查有效性, 默认falseconfig.setTestWhileIdle(false);// 逐出扫描的时间间隔(毫秒) 如果为负数,则不运行逐出线程, 默认-1config.setTimeBetweenEvictionRunsMillis(-1);String host = properties.getProperty("redisip");int port = Integer.parseInt(properties.getProperty("redisport"));String password = properties.getProperty("redispw");jedisPool = new JedisPool(config, host, port, 3000, password);log.info("redis线程池创建成功！host:"+host+",port:"+port);}public static Jedis getJedis() {return jedisPool.getResource();}public static void close(Jedis jedis) {if (jedis != null)jedis.close();}}

3.自定义的redissession容器

package com.easier.support;import java.util.HashMap;import java.util.Map;import com.alibaba.fastjson.JSONObject;public class RedisSession {private String id;private Map<String, String> map;private long creationTime;//创建时间private long lastAccessedTime;//上一次登录时间private int maxInactiveInterval=3600;//最大失效时间，单位（秒）public boolean invalidate(){return System.currentTimeMillis()<lastAccessedTime+(maxInactiveInterval*1000)?true:false;}public String getAttribute(String name) {return map.get(name);}public void setAttribute(String name, String value) {        if(map==null)        {        map = new HashMap<String, String>();        }map.put(name, value);}public String getId() {return id;}public void setId(String id) {this.id = id;}public long getCreationTime() {return creationTime;}public void setCreationTime(long creationTime) {this.creationTime = creationTime;}public long getLastAccessedTime() {return lastAccessedTime;}public void setLastAccessedTime(long lastAccessedTime) {this.lastAccessedTime = lastAccessedTime;}public int getMaxInactiveInterval() {return maxInactiveInterval;}public void setMaxInactiveInterval(int maxInactiveInterval) {this.maxInactiveInterval = maxInactiveInterval;}public Map<String, String> getMap() {return map;}public void setMap(Map<String, String> map) {this.map = map;}@Overridepublic String toString() {return "RedisSession [id=" + id + ", map=" + map + ", creationTime="+ creationTime + ", lastAccessedTime=" + lastAccessedTime+ ", maxInactiveInterval=" + maxInactiveInterval + "]";}/*public static void main(String[] args) {        RedisSession redisSession = new RedisSession();        redisSession.setAttribute("user", "kiddie");        redisSession.setCreationTime(System.currentTimeMillis());        redisSession.setId("redisid255");        redisSession.setLastAccessedTime(System.currentTimeMillis());        redisSession.setMaxInactiveInterval(3600);        String result = JSONObject.toJSONString(redisSession);System.out.println(result);RedisSession rs = JSONObject.parseObject(result, RedisSession.class);System.out.println(rs);}*/}

4.redisSesionUtils，用于各种redissession的操作

package com.easier.utils;import redis.clients.jedis.Jedis;import com.alibaba.fastjson.JSONObject;import com.easier.DB.RedisPools;import com.easier.support.RedisSession;public class RedisSessionUtils {public static RedisSession getRedisSession(String id) {RedisSession redisSession = null;Jedis jedis = RedisPools.getJedis();if (jedis.exists(id)) {String jsonResult = jedis.get(id);redisSession = JSONObject.parseObject(jsonResult,RedisSession.class);}RedisPools.close(jedis);return redisSession;}public static RedisSession addOrUpdateRedisSession(RedisSession redisSession) {Jedis jedis = RedisPools.getJedis();String result = JSONObject.toJSONString(redisSession);jedis.setex(redisSession.getId(),redisSession.getMaxInactiveInterval(),result);RedisPools.close(jedis);return redisSession;}private static String createRedisSessionID() {return MD5Utils.toMD5(System.currentTimeMillis() + "");}public static RedisSession createRedisSession() {RedisSession redisSession = new RedisSession();redisSession.setId(createRedisSessionID());redisSession.setCreationTime(System.currentTimeMillis());redisSession.setLastAccessedTime(System.currentTimeMillis());redisSession.setMaxInactiveInterval(Integer.parseInt(PropertiesUtils.get("sessiontime")));return redisSession;}public static void main(String[] args) {String id = "foo";Jedis jedis = RedisPools.getJedis();System.out.println(jedis.exists(id));}}package com.easier.utils;import redis.clients.jedis.Jedis;import com.alibaba.fastjson.JSONObject;import com.easier.DB.RedisPools;import com.easier.support.RedisSession;public class RedisSessionUtils {<span style="white-space:pre"></span>public static RedisSession getRedisSession(String id) {<span style="white-space:pre"></span>RedisSession redisSession = null;<span style="white-space:pre"></span>Jedis jedis = RedisPools.getJedis();//从线程池得到redis连接<span style="white-space:pre"></span>if (jedis.exists(id)) {//如果key存在<span style="white-space:pre"></span>String jsonResult = jedis.get(id);//得到key的json的value<span style="white-space:pre"></span>redisSession = JSONObject.parseObject(jsonResult,<span style="white-space:pre"></span>RedisSession.class);//将得到的json格式数据变成redisSession对象<span style="white-space:pre"></span>}<span style="white-space:pre"></span>RedisPools.close(jedis);//关闭连接<span style="white-space:pre"></span>return redisSession;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public static RedisSession addOrUpdateRedisSession(RedisSession redisSession) {<span style="white-space:pre"></span>Jedis jedis = RedisPools.getJedis();//从线程池得到redis连接<span style="white-space:pre"></span>String result = JSONObject.toJSONString(redisSession);<span style="white-space:pre"></span>jedis.setex(redisSession.getId(),<span style="white-space:pre"></span>redisSession.getMaxInactiveInterval(),result);<span style="white-space:pre"></span>RedisPools.close(jedis);<span style="white-space:pre"></span>return redisSession;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>private static String createRedisSessionID() {<span style="white-space:pre"></span>return MD5Utils.toMD5(System.currentTimeMillis() + "");<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public static RedisSession createRedisSession() {<span style="white-space:pre"></span>RedisSession redisSession = new RedisSession();<span style="white-space:pre"></span>redisSession.setId(createRedisSessionID());//得到随机的sessionid<span style="white-space:pre"></span>redisSession.setCreationTime(System.currentTimeMillis());//创建时间<span style="white-space:pre"></span>redisSession.setLastAccessedTime(System.currentTimeMillis());//上次进入时间<span style="white-space:pre"></span>redisSession.setMaxInactiveInterval(Integer.parseInt(PropertiesUtils<span style="white-space:pre"></span>.get("sessiontime")));//session失效时间<span style="white-space:pre"></span>return redisSession;<span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>public static void main(String[] args) {<span style="white-space:pre"></span>String id = "foo";<span style="white-space:pre"></span>Jedis jedis = RedisPools.getJedis();<span style="white-space:pre"></span>System.out.println(jedis.exists(id));<span style="white-space:pre"></span>}}

5.redissession过滤器，这一段很重要

package com.easier.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.easier.support.RedisSession;import com.easier.utils.PropertiesUtils;import com.easier.utils.RedisSessionUtils;public class RedisSessionFilter implements Filter {private static String redisSessionKey = "REDISSESSIONID";//用于cookies的key@Overridepublic void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {HttpServletRequest httpServletRequest = (HttpServletRequest) request;HttpServletResponse httpServletResponse = (HttpServletResponse) response;String redisSessionId = null;Cookie[] cookies = httpServletRequest.getCookies();if (cookies != null) {//cookies有可能没有带cookies过来，防止空指针报错for (Cookie cookie : cookies) {if (redisSessionKey.equalsIgnoreCase(cookie.getName())) {redisSessionId = cookie.getValue();//根据客户端传过来的key值得到id值break;}}}if (redisSessionId != null) {//如果redisSessionId不为空，则可以从redis数据库拿到sessionRedisSession redisSession = RedisSessionUtils.getRedisSession(redisSessionId);if (redisSession != null) {//如果不为空，就把session存入request以便Controller调用httpServletRequest.setAttribute(PropertiesUtils.get("session"),redisSession);}}chain.doFilter(httpServletRequest, httpServletResponse);//过滤器放行RedisSession redisSession = (RedisSession) httpServletRequest.getAttribute(PropertiesUtils.get("session"));//从request中得到redisSessionif (redisSession != null) {//如果不为空，则向客户端写入cookies并且更新过期的时间redisSession.setLastAccessedTime(System.currentTimeMillis());//更新最后操作时间RedisSessionUtils.addOrUpdateRedisSession(redisSession);Cookie cookie = new Cookie(redisSessionKey, redisSession.getId());cookie.setMaxAge(redisSession.getMaxInactiveInterval());//设置过期时间httpServletResponse.addCookie(cookie);}}@Overridepublic void destroy() {}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}}