redistemplate下opsForHash操作示例

redisTemplate.opsForHash().put("hashValue","map1","map1-1");  
redisTemplate.opsForHash().put("hashValue","map2","map2-2");

List<Object> hashList = redisTemplate.opsForHash().values("hashValue");  
System.out.println("通过values(H key)方法获取变量中的hashMap值:" + hashList);

Map<Object,Object> map = redisTemplate.opsForHash().entries("hashValue");  
System.out.println("通过entries(H key)方法获取变量中的键值对:" + map);

Object mapValue = redisTemplate.opsForHash().get("hashValue","map1");  
System.out.println("通过get(H key, Object hashKey)方法获取map键的值:" + mapValue);

boolean hashKeyBoolean = redisTemplate.opsForHash().hasKey("hashValue","map3");  
System.out.println("通过hasKey(H key, Object hashKey)方法判断变量中是否存在map键:" + hashKeyBoolean);

Set<Object> keySet = redisTemplate.opsForHash().keys("hashValue");  
System.out.println("通过keys(H key)方法获取变量中的键:" + keySet);

long hashLength = redisTemplate.opsForHash().size("hashValue");  
System.out.println("通过size(H key)方法获取变量的长度:" + hashLength);

double hashIncDouble = redisTemplate.opsForHash().increment("hashInc","map1",3);  
System.out.println("通过increment(H key, HK hashKey, double delta)方法使变量中的键以值的大小进行自增长:" + hashIncDouble);

long hashIncLong = redisTemplate.opsForHash().increment("hashInc","map2",6);  
System.out.println("通过increment(H key, HK hashKey, long delta)方法使变量中的键以值的大小进行自增长:" + hashIncLong);

List<Object> list = new ArrayList<Object>();  
list.add("map1");  
list.add("map2");  
List mapValueList = redisTemplate.opsForHash().multiGet("hashValue",list);  
System.out.println("通过multiGet(H key, Collection<HK> hashKeys)方法以集合的方式获取变量中的值:"+mapValueList);

Map newMap = new HashMap();  
newMap.put("map3","map3-3");  
newMap.put("map5","map5-5");  
redisTemplate.opsForHash().putAll("hashValue",newMap);  
map = redisTemplate.opsForHash().entries("hashValue");  
System.out.println("通过putAll(H key, Map<? extends HK,? extends HV> m)方法以map集合的形式添加键值对:" + map);

redisTemplate.opsForHash().putIfAbsent("hashValue","map6","map6-6");  
map = redisTemplate.opsForHash().entries("hashValue");  
System.out.println("通过putIfAbsent(H key, HK hashKey, HV value)方法添加不存在于变量中的键值对:" + map);

Cursor<Map.Entry<Object,Object>> cursor = redisTemplate.opsForHash().scan("hashValue",ScanOptions.scanOptions().match("map1").build());  
//Cursor<Map.Entry<Object,Object>> cursor = redisTemplate.opsForHash().scan("hashValue",ScanOptions.NONE);  
while (cursor.hasNext()){  
    Map.Entry<Object,Object> entry = cursor.next();  
    System.out.println("通过scan(H key, ScanOptions options)方法获取匹配键值对:" + entry.getKey() + "---->" + entry.getValue());  
}

redisTemplate.opsForHash().delete("hashValue","map1","map2");  
map = redisTemplate.opsForHash().entries("hashValue");  
System.out.println("通过delete(H key, Object... hashKeys)方法删除变量中的键值对后剩余的:" + map);

public List<Menu> selectMenus() throws Exception {
Collection<String> menujsons = redisTemplate.opsForHash().entries("menuList").values();
    //查看缓存是否存在菜单
    if (menujsons != null && menujsons.size() != 0) {
        List<Menu> menuList = new ArrayList<>();
        menujsons.forEach(a -> menuList.add(JSONObject.parseObject(a, Menu.class)));
        //缓存取出数据排序
        Collections.sort(menuList, Comparator.comparing(BaseEntity::getId));
        return menuList;
    }
    //不存在 数据库中查询并存入缓存 返回
    List<Menu> allMenu = getMapper().selectMenus();
    if(CollectionUtils.isNotEmpty(allMenu)){
        allMenu.forEach(m -> redisTemplate.opsForHash().put("menuList", m.getId().toString(), JSONObject.toJSONString(m)));
    }
    return allMenu;
}