Java springboot取消对模板的绑定。可能会产生NullPointerException
我在项目中使用springboot(2.3.1)和莴苣 滤器Java springboot取消对模板的绑定。可能会产生NullPointerException,java,spring-boot,lettuce,Java,Spring Boot,Lettuce,我在项目中使用springboot(2.3.1)和莴苣 滤器 @Slf4j @WebFilter(filterName = "requestWrapperFilter", urlPatterns = {"/*"}) public class RequestWrapperFilter implements Filter { @Resource private RedisTemplate redisTemplate; @Ove
@Slf4j
@WebFilter(filterName = "requestWrapperFilter", urlPatterns = {"/*"})
public class RequestWrapperFilter implements Filter {
@Resource
private RedisTemplate redisTemplate;
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
...
if (redisTemplate.hasKey(COMMON_HEAD_TOKEN_NAME + token)) {
redisTemplate.delete(COMMON_HEAD_TOKEN_NAME + token);
}
}
...
}
重新配置的配置如下所示:
@Configuration
@Component
public class RedisConfig {
@Bean
public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory) {
RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<>();
redisTemplate.setKeySerializer(new StringRedisSerializer());
redisTemplate.setValueSerializer(new Jackson2JsonRedisSerializer(Object.class));
redisTemplate.setConnectionFactory(connectionFactory);
return redisTemplate;
}
}
我可以忽略吗?第一个警告意味着
hasKey
方法返回一个对象包装器,但如果条件隐式地解除了它的绑定(即将调用结果转换为原始值),则在内使用它。如果由于某种原因,hasKey
方法返回null
,您将得到一个错误。为了安全起见,请按如下方式检查钥匙是否存在:
if (Boolean.TRUE.equals(redisTemplate.hasKey(COMMON_HEAD_TOKEN_NAME + token))) {
@Resource
private RedisTemplate<String, Serializable> redisTemplate;
第二个警告意味着redisTemplate
字段具有原始类型,但是redisTemplate
类是参数化的。要消除警告,请在筛选器中定义redisTemplate
字段,如下所示:
if (Boolean.TRUE.equals(redisTemplate.hasKey(COMMON_HEAD_TOKEN_NAME + token))) {
@Resource
private RedisTemplate<String, Serializable> redisTemplate;
@Resource
私有再贴现模板;