本文实例讲述了Java简单实现session保存到redis的方法。分享给大家供大家参考，具体如下：
在负载均衡情况下，如果用户访问不同的机器，如果没有做session同步，用户就会被提出，这样用户体验非常不好，所以我们很有必要做session同步，把session放到reids缓存服务器就能很好的解决问题。下面是代码简单的实现。
一、配置web.xml过滤器：
sessionFilter org.springframework.web.filter.DelegatingFilterProxy sessionFilter /*
二、配置对应的过滤器名字：
三、SessionFilter的实现：
public class SessionFilter extends GenericFilterBean {
private RedisTemplate redisTemplate;
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
System.out.println("filter");
HttpServletRequest re = (HttpServletRequest)request;
HttpServletResponse res = (HttpServletResponse)response;
TerryHttpServletRequestWrapper wrapper = new TerryHttpServletRequestWrapper(re,res,redisTemplate);
chain.doFilter(wrapper, response);
}
public RedisTemplate getRedisTemplate() {
return redisTemplate;
}
public void setRedisTemplate(RedisTemplate redisTemplate) {
this.redisTemplate = redisTemplate;
}
}
四、TerryHttpServletRequestWrapper的实现：
public class TerryHttpServletRequestWrapper extends HttpServletRequestWrapper {
private CacheHttpSession session;
private HttpServletResponse response;
private RedisTemplate redisTemplate;
public TerryHttpServletRequestWrapper(HttpServletRequest request, HttpServletResponse response,RedisTemplate redisTemplate) {
super(request);
this.response = response;
this.redisTemplate = redisTemplate;
}
@Override
public HttpSession getSession(boolean create) {
if(session != null) {
return session;
}
String sid = "terry" + System.currentTimeMillis();
writeSidTocookie(sid);
session = new CacheHttpSession(null,sid,redisTemplate);
return session;
}
@Override
public HttpSession getSession() {
return getSession(false);
}
protected void writeSidTocookie(String sid) {
cookie mycookies = new cookie("terry", sid);
mycookies.setMaxAge(-1);
mycookies.setDomain("locahost");
mycookies.setPath("/");
response.addcookie(mycookies);
}
}
五、CacheHttpSession的实现：
public class CacheHttpSession extends HttpSessionWrapper {
private String sid;
private RedisTemplate redisTemplate;
private StringRedisSerializer stringSerializer = new StringRedisSerializer();
public CacheHttpSession(HttpSession session,String sid,RedisTemplate redisTemplate) {
super(session);
this.sid = sid;
this.redisTemplate = redisTemplate;
}
@SuppressWarnings("unchecked")
@Override
public Enumeration getAttributeNames() {
final byte[] key = stringSerializer.serialize(sid);
Object result = redisTemplate.execute(new RedisCallback
六、HttpSessionWrapper的实现：
public class HttpSessionWrapper implements HttpSession {
private HttpSession session;
public HttpSessionWrapper(HttpSession session) {
this.session = session;
}
@Override
public long getCreationTime() {
return this.session.getCreationTime();
}
@Override
public String getId() {
return this.session.getId();
}
@Override
public long getLastAccessedTime() {
return this.session.getLastAccessedTime();
}
@Override
public ServletContext getServletContext() {
return this.session.getServletContext();
}
@Override
public void setMaxInactiveInterval(int interval) {
this.session.setMaxInactiveInterval(interval);
}
@Override
public int getMaxInactiveInterval() {
return this.session.getMaxInactiveInterval();
}
@Override
public HttpSessionContext getSessionContext() {
return this.session.getSessionContext();
}
@Override
public Object getAttribute(String name) {
return this.session.getAttribute(name);
}
@Override
public Object getValue(String name) {
return this.session.getValue(name);
}
@Override
public Enumeration getAttributeNames() {
return this.session.getAttributeNames();
}
@Override
public String[] getValueNames() {
return this.session.getValueNames();
}
@Override
public void setAttribute(String name, Object value) {
this.session.setAttribute(name,value);
}
@Override
public void putValue(String name, Object value) {
this.session.putValue(name,value);
}
@Override
public void removeAttribute(String name) {
this.session.removeAttribute(name);
}
@Override
public void removevalue(String name) {
this.session.removevalue(name);
}
@Override
public void invalidate() {
this.session.invalidate();
}
@Override
public boolean isNew() {
return this.session.isNew();
}
}
以上代码就能把session保存到redis，当然这其中还有很多问题，比如sessionId的生成，session过去，对象序列化（测试为了方便统一用了string），等等很多问题。以后有时间再完善。
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