spring boot定制Jackson ObjectMapper，为什么不生效

先说结论：

项目中定制了spring 的redisTemplate，而这个template没有使用我自定义的Jackson ObjectMapper。所以不生效。

 

下面是详细过程：

起因是spring boot项目加入了shiro，我打算使用redis去存储shiro的会话，方便以后横向扩展。

参考了网上的实现后，决定通过扩展org.apache.shiro.session.mgt.eis.AbstractSessionDAO来实现。

以下是实现代码：

  1 package com.ceiec.baseplatform.config;
  2 
  3 import com.ceiec.baseplatform.redis.StringKeyRedisTemplate;
  4 import org.apache.commons.collections.CollectionUtils;
  5 import org.apache.shiro.session.Session;
  6 import org.apache.shiro.session.UnknownSessionException;
  7 import org.apache.shiro.session.mgt.eis.AbstractSessionDAO;
  8 import org.slf4j.Logger;
  9 import org.slf4j.LoggerFactory;
 10 import org.springframework.beans.factory.annotation.Autowired;
 11 import org.springframework.stereotype.Component;
 12 
 13 import java.io.Serializable;
 14 import java.util.Collection;
 15 import java.util.concurrent.TimeUnit;
 16 
 17 @Component
 18 public class RedisSessionDAO extends AbstractSessionDAO {
 19     private static Logger logger = LoggerFactory.getLogger(RedisSessionDAO.class);
 20 
 21     @SuppressWarnings("rawtypes")
 22     @Autowired
 23     private StringKeyRedisTemplate<String, Object> redisTemplate;
 24 
 25     private static final String DEFAULT_SESSION_KEY_PREFIX = "shirosession:";
 26 
 27     private String keyPrefix = DEFAULT_SESSION_KEY_PREFIX;
 28 
 29     private long expireTime = 120000;
 30 
 31     public RedisSessionDAO() {
 32         super();
 33     }
 34 
 35     public RedisSessionDAO(long expireTime) {
 36         super();
 37         this.expireTime = expireTime;
 38     }
 39 
 40     @Override // 更新session
 41     public void update(Session session) throws UnknownSessionException {
 42         System.out.println("===============update================");
 43         if (session == null || session.getId() == null) {
 44             return;
 45         }
 46         session.setTimeout(expireTime);
 47         String key = getKey(session);
 48         redisTemplate.opsForValue().set(key, session, expireTime, TimeUnit.MILLISECONDS);
 49     }
 50 
 51     private String getKey(Session session) {
 52         return this.keyPrefix + String.valueOf(session.getId());
 53     }
 54     private String getSessionIdKey(String sessionId) {
 55         return this.keyPrefix + String.valueOf(sessionId);
 56     }
 57 
 58     @Override // 删除session
 59     public void delete(Session session) {
 60         System.out.println("===============delete================");
 61         if (null == session) {
 62             return;
 63         }
 64         redisTemplate.opsForValue().getOperations().delete(getKey(session));
 65     }
 66 
 67     @Override
 68 // 获取活跃的session，可以用来统计在线人数，如果要实现这个功能，可以在将session加入redis时指定一个session前缀，统计的时候则使用keys("session-prefix*")的方式来模糊查找redis中所有的session集合
 69     public Collection<Session> getActiveSessions() {
 70 //        System.out.println("==============getActiveSessions=================");
 71 //        return redisTemplate.keys("*");
 72         return CollectionUtils.EMPTY_COLLECTION;
 73     }
 74 
 75     @Override// 加入session
 76     protected Serializable doCreate(Session session) {
 77         System.out.println("===============doCreate================");
 78         Serializable sessionId = this.generateSessionId(session);
 79         this.assignSessionId(session, sessionId);
 80 
 81         redisTemplate.opsForValue().set(getKey(session), session, expireTime, TimeUnit.MILLISECONDS);
 82         return sessionId;
 83     }
 84 
 85     @Override// 读取session
 86     protected Session doReadSession(Serializable sessionId) {
 87         System.out.println("==============doReadSession=================");
 88         if (sessionId == null) {
 89             return null;
 90         }
 91         return (Session) redisTemplate.opsForValue().get(getSessionIdKey(String.valueOf(sessionId)));
 92     }
 93 
 94     public long getExpireTime() {
 95         return expireTime;
 96     }
 97 
 98     public void setExpireTime(long expireTime) {
 99         this.expireTime = expireTime;
100     }
101 
102 
103 }

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