Redis集合类型(Set)常用命令演示和实践练习代码

package redis.chap01; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Random; import java.util.Set; import org.apache.commons.lang3.math.NumberUtils; import redis.clients.jedis.Jedis; public class SetLession { public static void main(String[] args) { SetLession sl = new SetLession(); sl.clear(); //添加一批商品 for(int i = 0; i< 42; i++) { Goods goods = new Goods(0, "goods" + String.format("%05d", (i + 1)), i); sl.addGoods(goods); } //读取商品总数 System.out.println("商品总数: " + sl.getTotalCount()); //删除第29件商品 sl.delGoods(29); System.out.println("删除后商品总数: " + sl.getTotalCount()); //分页显示 List<Goods> list = sl.getGoodsList(2, 20); System.out.println("第二页商品:"); for(Goods goods : list) { System.out.println(goods); } //按分类查找 List<Goods> listByTag = sl.findGoodsByTag("big", "green"); System.out.println("所有尺寸为big,颜色为green的商品:"); for(Goods goods : listByTag) { System.out.println(goods); } } private final String[] SIZE = { "small", "middle", "big" }; private final String[] COLOR = { "red", "yellow", "green" }; private Jedis jedis = null; public SetLession() { this.jedis = JedisProvider.getJedis(); } /** * 获得一个自增主键值 * @return */ private long getIncrementId() { String key = "goods:count"; return jedis.incr(key); } /** * 添加一个商品 * @param goods * @return */ public boolean addGoods(Goods goods) { long id = getIncrementId(); Map<String, String> map = new HashMap<>(); map.put("id", String.valueOf(id)); map.put("title", goods.getTitle()); map.put("price", String.valueOf(goods.getPrice())); //随机获得三个分类 String size = SIZE[new Random().nextInt(SIZE.length)]; String color = COLOR[new Random().nextInt(COLOR.length)]; String key = "goods:" + id; boolean added = jedis.hmset(key, map).equals("OK"); if(added) { jedis.rpush("goods:list", String.valueOf(id)); //记录商品所属分类 jedis.sadd("goods:" + id + ":tags", size, color); //记录每个分类下包含的商品ID jedis.sadd("tag:" + size + ":goods", String.valueOf(id)); jedis.sadd("tag:" + color + ":goods", String.valueOf(id)); } return added; } /** * 修改商品标题 * @param goods * @return */ public boolean updateTitle(long id, String title) { String key = "goods:" + id; return jedis.hset(key, "title", title) == 0; } /** * 修改商品价格 * @param id * @param price * @return */ public boolean updatePrice(long id, float price) { String key = "goods:" + id; return jedis.hset(key, "price", String.valueOf(price)) == 0; } /** * 删除商品 * @param id * @return */ public boolean delGoods(long id) { long deleted = jedis.del("goods:" + id); if(deleted == 1) { jedis.lrem("goods:list", 1, String.valueOf(id)); } return deleted == 1; } /** * 读取商品总数 * @return */ public long getTotalCount() { String key = "goods:list"; return jedis.llen(key); } /** * 读取用于分页的商品列表 * @param pageIndex 页数 * @param pageSize 每页显示行数 * @return */ public List<Goods> getGoodsList(int pageIndex, int pageSize) { int totals = (int)getTotalCount(); int from = (pageIndex - 1) * pageSize; if(from < 0) { from = 0; } else if(from > totals) { from = (totals / pageSize) * pageSize; } int to = from + pageSize - 1; if(to > totals) { to = totals; } List<Goods> goodsList = new ArrayList<>(); List<String> idList = jedis.lrange("goods:list", from, to); for(String id : idList) { String key = "goods:" + id; Map<String, String> maps = jedis.hgetAll(key); Goods goods = new Goods(); goods.setId(NumberUtils.toLong(maps.get("id"))); goods.setTitle(maps.get("title")); goods.setPrice(NumberUtils.toFloat(maps.get("price"))); //读取分类 goods.setTags(jedis.smembers("goods:" + id + ":tags")); goodsList.add(goods); } return goodsList; } /** * 查找指定尺寸的商品 * @param size * @return */ public List<Goods> findGoodsBySize(String size) { Set<String> ids = jedis.smembers("tag:" + size + ":goods"); List<Goods> goodsList = new ArrayList<>(); for(String id : ids) { String key = "goods:" + id; Map<String, String> maps = jedis.hgetAll(key); Goods goods = new Goods(); goods.setId(NumberUtils.toLong(maps.get("id"))); goods.setTitle(maps.get("title")); goods.setPrice(NumberUtils.toFloat(maps.get("price"))); //读取分类 goods.setTags(jedis.smembers("goods:" + id + ":tags")); goodsList.add(goods); } return goodsList; } /** * 查找指定尺寸和颜色的商品 * @param size * @param color * @return */ public List<Goods> findGoodsByTag(String size, String color) { Set<String> ids = jedis.sinter("tag:" + size + ":goods", "tag:" + color + ":goods"); List<Goods> goodsList = new ArrayList<>(); for(String id : ids) { String key = "goods:" + id; Map<String, String> maps = jedis.hgetAll(key); Goods goods = new Goods(); goods.setId(NumberUtils.toLong(maps.get("id"))); goods.setTitle(maps.get("title")); goods.setPrice(NumberUtils.toFloat(maps.get("price"))); //读取分类 goods.setTags(jedis.smembers("goods:" + id + ":tags")); goodsList.add(goods); } return goodsList; } public void clear() { jedis.flushDB(); } }