1、put(H key, HK hashKey, HV value)
新增hashMap值redisTemplate.opsForHash().put("hashValue","map1","map1-1"); redisTemplate.opsForHash().put("hashValue","map2","map2-2"); 2、values(H key)
获取指定变量中的hashMap值。List<Object> hashList = redisTemplate.opsForHash().values("hashValue"); System.out.println("通过values(H key)办法获取变量中的hashMap值:" + hashList); 3、entries(H key)
获取变量中的键值对。Map<Object,Object> map = redisTemplate.opsForHash().entries("hashValue"); System.out.println("通过entries(H key)办法获取变量中的键值对:" + map);4、get(H key, Object hashKey)
获取变量中的指定map键是否有值,如果存在该map键则获取值，没有则返回null。Object mapValue = redisTemplate.opsForHash().get("hashValue","map1"); System.out.println("通过get(H key, Object hashKey)办法获取map键的值:" + mapValue); 5、hasKey(H key, Object hashKey)
判断变量中是否有指定的map键。boolean hashKeyBoolean = redisTemplate.opsForHash().hasKey("hashValue","map3"); System.out.println("通过hasKey(H key, Object hashKey)办法判断变量中是否存在map键:" + hashKeyBoolean); 6、keys(H key)
获取变量中的键。Set<Object> keySet = redisTemplate.opsForHash().keys("hashValue"); System.out.println("通过keys(H key)办法获取变量中的键:" + keySet); 7、size(H key)
获取变量的长度。long hashLength = redisTemplate.opsForHash().size("hashValue"); System.out.println("通过size(H key)办法获取变量的长度:" + hashLength); 8、increment(H key, HK hashKey, double delta)
使变量中的键以double值的大小进行自增长。double hashIncDouble = redisTemplate.opsForHash().increment("hashInc","map1",3); System.out.println("通过increment(H key, HK hashKey, double delta)办法使变量中的键以值的大小进行自增长:" + hashIncDouble); 9、increment(H key, HK hashKey, long delta)
使变量中的键以long值的大小进行自增长。long hashIncLong = redisTemplate.opsForHash().increment("hashInc","map2",6); System.out.println("通过increment(H key, HK hashKey, long delta)办法使变量中的键以值的大小进行自增长:" + hashIncLong); 10、multiGet(H key, Collection<HK> hashKeys)
以汇合的形式获取变量中的值。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)办法以汇合的形式获取变量中的值:"+mapValueList); 11、putAll(H key, Map<? extends HK,? extends HV> m)
以map汇合的模式增加键值对。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)办法以map汇合的模式增加键值对:" + map); 12、putIfAbsent(H key, HK hashKey, HV value)
如果变量值存在，在变量中能够增加不存在的的键值对，如果变量不存在，则新增一个变量，同时将键值对增加到该变量。redisTemplate.opsForHash().putIfAbsent("hashValue","map6","map6-6"); map = redisTemplate.opsForHash().entries("hashValue"); System.out.println("通过putIfAbsent(H key, HK hashKey, HV value)办法增加不存在于变量中的键值对:" + map); 13、scan(H key, ScanOptions options)
匹配获取键值对，ScanOptions.NONE为获取全副键对，ScanOptions.scanOptions().match("map1").build() 匹配获取键位map1的键值对,不能含糊匹配。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)办法获取匹配键值对:" + entry.getKey() + "---->" + entry.getValue()); } 14、delete(H key, Object... hashKeys)
删除变量中的键值对，能够传入多个参数，删除多个键值对。redisTemplate.opsForHash().delete("hashValue","map1","map2"); map = redisTemplate.opsForHash().entries("hashValue"); System.out.println("通过delete(H key, Object... hashKeys)办法删除变量中的键值对后残余的:" + map); 15.缓存菜单的操作
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 数据库中查问并存入缓存 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;}