springmvc修改session存入redis

思想：修改 session 方法，使 session 添加获取属性时，将需要存储的信息存入redis，或者从redis获取存储的信息。

 

1. 将拦截所有请求，交给sessionFilter处理

　　<!-- spring-session拦截器 -->
    <filter>
    <filter-name>sessionFilter</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>sessionFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

<bean id="sessionFilter" class="com.gtafe.util.redis.SessionFilter"></bean>

public class SessionFilter extends GenericFilterBean {

    @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;
        
        MyHttpServletRequestWrapper wrapper = new MyHttpServletRequestWrapper(re, res);
        chain.doFilter(wrapper, response);
    }

}

 

2. 修改获取 session 的方法

public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper {
    private CacheHttpSession session;
    private HttpServletResponse response;
    private HttpServletRequest myRequest;

    public MyHttpServletRequestWrapper(HttpServletRequest request, HttpServletResponse response) {
        super(request);
        this.myRequest = request;
        this.response = response;
    }

    @Override
    public HttpSession getSession(boolean create) {
        
        
        if (session != null) {
            System.out.println("  XD ============  获取 session ============== sid = " + session.getId());
            return session;
        }

        String sid = null;
        Cookie[] cookies = myRequest.getCookies();// 这样便可以获取一个cookie数组
        System.out.println("   XD cookies   ====   " + cookies);
        if(cookies != null){
            for (Cookie cookie : cookies) {
                System.out.println("  XD  key = " + cookie.getName() + "   value   =   " + cookie.getValue());
                if("mycookies".equals(cookie.getName())){
                    sid = cookie.getValue();
                }
            }
        }
        if(sid == null){
            sid =  UUID.randomUUID().toString();
        }
        System.out.println("  XD  ============  创建 session ============== sid = " + sid);
        
        writeSidToCookie(sid);
        session = new CacheHttpSession(null, sid);
        return session;
    }

    @Override
    public HttpSession getSession() {
        return getSession(false);
    }

    protected void writeSidToCookie(String sid) { // TODO 
        Cookie mycookies = new Cookie("mycookies", sid);
        mycookies.setMaxAge(-1);
        //mycookies.setDomain("locahost");
        mycookies.setPath("/");
        response.addCookie(mycookies);
    }
}

 

3. 重写的session的方法

public class CacheHttpSession extends HttpSessionWrapper {
    private String sid;

    public CacheHttpSession(HttpSession session, String sid) {
        super(session);
        this.sid = sid;
    }

    @SuppressWarnings("unchecked")
    @Override
    public Enumeration getAttributeNames() {
        return RedisUtil.getHashObjs(sid);
    }

    @SuppressWarnings("unchecked")
    @Override
    public void setAttribute(String name, Object value) {
        RedisUtil.setHObj(sid, name, value);
    }

    @Override
    public Object getAttribute(String name) {
        return RedisUtil.getHObj(sid, name);
    }

    @Override
    public void removeAttribute(String name) {
        RedisUtil.removeHObj(sid, name);
    }
    

    @Override
    public void invalidate() {
        RedisUtil.expirObj(sid);
    }
    
    @Override
    public String getId() {
        return sid;
    }
}

 

4. 默认的 session 的方法实现

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<String> 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();
      }

}