1、文件所在位置： 2、需要Guava依赖：

        <dependency>
            <groupId>com.google.guavagroupId>
            <artifactId>guavaartifactId>
            <version>23.0version>
        dependency>

3、启动时就读取放入缓存的代码：

@Service
@AllArgsConstructor
@Slf4j
public class SensitiveCheckService {

    private static final Cache<String, String> SENSITIVE_WORDS_CACHE = CacheBuilder.newBuilder()
            // 设置缓存容量数
            .maximumSize(1)
            .build();

    static {
        try {
            ClassLoader classLoader = DemoApplication.class.getClassLoader();
            Enumeration<URL> resources = classLoader.getResources("static/sensitive/敏感词库.txt");
            List<String> allSensitiveList = new ArrayList<>();
            while (resources.hasMoreElements()) {
                URL resource = resources.nextElement();
                BufferedReader reader = new BufferedReader(new InputStreamReader(resource.openStream(), "utf-8"));
                String line;
                while ((line = reader.readLine()) != null) {
                    // 一行行读取
                    allSensitiveList.add(line);
                }
                SENSITIVE_WORDS_CACHE.put(RedisKeyConstant.ALL_SENSITIVE_WORDS, JSON.toJSONString(allSensitiveList));
            }
        } catch (Exception e) {
            log.error("加载敏感词失败", e);
        }
    }

    public List<String> getSensitiveWordsCache() {
        return JSON.parseArray(SENSITIVE_WORDS_CACHE.getIfPresent(RedisKeyConstant.ALL_SENSITIVE_WORDS), String.class);
    }

}

Guava的缓存类似于redis。比起Redis，Guava的缓存优势在于更轻更快，而Redis的优势在于支持分布式