<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>22.0</version>
</dependency>

public class BlongTest {
    /**
     * 在布隆中存放100萬條數(shù)據(jù)
     */
    private static Integer size = 1000000;
    public static void main(String[] args) {
        BloomFilter<Integer> integerBloomFilter = BloomFilter.create(Funnels.integerFunnel(), size, 0.01);
        for (int i = 0; i < size; i++) {
            integerBloomFilter.put(i);
        }
        // 從布隆中查詢數(shù)據(jù)是否存在
        ArrayList<Integer> strings = new ArrayList<>();
        for (int j = size; j < size + 10000; j++) {
            if (integerBloomFilter.mightContain(j)) {
                strings.add(j);
            }
        }
        System.out.println("誤判數(shù)量:" + strings.size());
    }
}

@RequestMapping("/getOrder")
public OrderEntity getOrder(Integer orderId) {
    if (integerBloomFilter != null) {
        if (!integerBloomFilter.mightContain(orderId)) {
            System.out.println("從布隆過濾器中檢測到該key不存在");
            return null;
        }
    }
    // 1.先查詢Redis中數(shù)據(jù)是否存在
    OrderEntity orderRedisEntity = (OrderEntity) redisTemplateUtils.getObject(orderId + "");
    if (orderRedisEntity != null) {
        System.out.println("直接從Redis中返回數(shù)據(jù)");
        return orderRedisEntity;
    }
    // 2. 查詢數(shù)據(jù)庫的內(nèi)容
    System.out.println("從DB查詢數(shù)據(jù)");
    OrderEntity orderDBEntity = orderMapper.getOrderById(orderId);
    if (orderDBEntity != null) {
        System.out.println("將Db數(shù)據(jù)放入到Redis中");
        redisTemplateUtils.setObject(orderId + "", orderDBEntity);
    }
    return orderDBEntity;
}
/**
* 添加訂單id到布隆過濾器中
*/
@RequestMapping("/dbToBulong")
public String dbToBulong() {
    List<Integer> orderIds = orderMapper.getOrderIds();
    integerBloomFilter = BloomFilter.create(Funnels.integerFunnel(), orderIds.size(), 0.01);
    for (int i = 0; i < orderIds.size(); i++) {
        integerBloomFilter.put(orderIds.get(i));
    }
    return "success";
}