更新 RedisTemplate 获取 Long的问题

朱晔 · 朱晔 · commit eb6c931b56d9 · 2020-04-14T15:32:52.000+08:00
diff --git a/src/main/java/org/geekbang/time/commonmistakes/serialization/redistemplate/CommonMistakesApplication.java b/src/main/java/org/geekbang/time/commonmistakes/serialization/redistemplate/CommonMistakesApplication.java
@@ -1,5 +1,6 @@
 package org.geekbang.time.commonmistakes.serialization.redistemplate;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -22,6 +23,7 @@ public <T> RedisTemplate<String, T> redisTemplate(RedisConnectionFactory redisCo
         redisTemplate.setConnectionFactory(redisConnectionFactory);
         Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
         ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.enable(DeserializationFeature.USE_LONG_FOR_INTS);
         //把类型信息作为属性写入Value
         objectMapper.activateDefaultTyping(objectMapper.getPolymorphicTypeValidator(), ObjectMapper.DefaultTyping.NON_FINAL);
         jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
diff --git a/src/main/java/org/geekbang/time/commonmistakes/serialization/redistemplate/RedisTemplateController.java b/src/main/java/org/geekbang/time/commonmistakes/serialization/redistemplate/RedisTemplateController.java
@@ -63,5 +63,21 @@ public void wrong2() {
         String key = "testCounter";
         countRedisTemplate.opsForValue().set(key, 1L);
         log.info("{} {}", countRedisTemplate.opsForValue().get(key), countRedisTemplate.opsForValue().get(key) instanceof Long);
+        Long l1 = getLongFromRedis(key);
+        countRedisTemplate.opsForValue().set(key, Integer.MAX_VALUE + 1L);
+        log.info("{} {}", countRedisTemplate.opsForValue().get(key), countRedisTemplate.opsForValue().get(key) instanceof Long);
+        Long l2 = getLongFromRedis(key);
+        log.info("{} {} {}", l1, l2);
+    }
+
+    private Long getLongFromRedis(String key) {
+        Object o = countRedisTemplate.opsForValue().get(key);
+        if (o instanceof Integer) {
+            return ((Integer) o).longValue();
+        }
+        if (o instanceof Long) {
+            return (Long) o;
+        }
+        return null;
     }
 }
