SpringBoot整合SpringCache SpringBoot整合SpringCache1、引入依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency>2、引入redis依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency>配置redis地址密码等等，可参考springboo整合redis3、默认配置自动配置// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) // package org.springframework.boot.autoconfigure.cache; import java.util.List; import java.util.stream.Collectors; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.ObjectProvider; import org.springframework.boot.autoconfigure.AutoConfigureAfter; import org.springframework.boot.autoconfigure.condition.ConditionalOnBean; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration; import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration; import org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration; import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryDependsOnPostProcessor; import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.cache.CacheManager; import org.springframework.cache.interceptor.CacheAspectSupport; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Import; import org.springframework.context.annotation.ImportSelector; import org.springframework.core.type.AnnotationMetadata; import org.springframework.orm.jpa.AbstractEntityManagerFactoryBean; import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean; import org.springframework.util.Assert; @Configuration( proxyBeanMethods = false ) @ConditionalOnClass({CacheManager.class}) @ConditionalOnBean({CacheAspectSupport.class}) @ConditionalOnMissingBean( value = {CacheManager.class}, name = {"cacheResolver"} ) @EnableConfigurationProperties({CacheProperties.class}) @AutoConfigureAfter({CouchbaseDataAutoConfiguration.class, HazelcastAutoConfiguration.class, HibernateJpaAutoConfiguration.class, RedisAutoConfiguration.class}) @Import({CacheAutoConfiguration.CacheConfigurationImportSelector.class, CacheAutoConfiguration.CacheManagerEntityManagerFactoryDependsOnPostProcessor.class}) public class CacheAutoConfiguration { public CacheAutoConfiguration() { } @Bean @ConditionalOnMissingBean public CacheManagerCustomizers cacheManagerCustomizers(ObjectProvider<CacheManagerCustomizer<?>> customizers) { return new CacheManagerCustomizers((List)customizers.orderedStream().collect(Collectors.toList())); } @Bean public CacheAutoConfiguration.CacheManagerValidator cacheAutoConfigurationValidator(CacheProperties cacheProperties, ObjectProvider<CacheManager> cacheManager) { return new CacheAutoConfiguration.CacheManagerValidator(cacheProperties, cacheManager); } static class CacheConfigurationImportSelector implements ImportSelector { CacheConfigurationImportSelector() { } public String[] selectImports(AnnotationMetadata importingClassMetadata) { CacheType[] types = CacheType.values(); String[] imports = new String[types.length]; for(int i = 0; i < types.length; ++i) { imports[i] = CacheConfigurations.getConfigurationClass(types[i]); } return imports; } } static class CacheManagerValidator implements InitializingBean { private final CacheProperties cacheProperties; private final ObjectProvider<CacheManager> cacheManager; CacheManagerValidator(CacheProperties cacheProperties, ObjectProvider<CacheManager> cacheManager) { this.cacheProperties = cacheProperties; this.cacheManager = cacheManager; } public void afterPropertiesSet() { Assert.notNull(this.cacheManager.getIfAvailable(), () -> { return "No cache manager could be auto-configured, check your configuration (caching type is '" + this.cacheProperties.getType() + "')"; }); } } @ConditionalOnClass({LocalContainerEntityManagerFactoryBean.class}) @ConditionalOnBean({AbstractEntityManagerFactoryBean.class}) static class CacheManagerEntityManagerFactoryDependsOnPostProcessor extends EntityManagerFactoryDependsOnPostProcessor { CacheManagerEntityManagerFactoryDependsOnPostProcessor() { super(new String[]{"cacheManager"}); } } }所有相关配置都在CacheProperties。重点关注自动配置中的： static class CacheConfigurationImportSelector implements ImportSelector { CacheConfigurationImportSelector() { } public String[] selectImports(AnnotationMetadata importingClassMetadata) { CacheType[] types = CacheType.values(); String[] imports = new String[types.length]; for(int i = 0; i < types.length; ++i) { imports[i] = CacheConfigurations.getConfigurationClass(types[i]); } return imports; } }CacheConfigurations.getConfigurationClass(types[i]); static String getConfigurationClass(CacheType cacheType) { String configurationClassName = (String)MAPPINGS.get(cacheType); Assert.state(configurationClassName != null, () -> { return "Unknown cache type " + cacheType; }); return configurationClassName; }MAPPINGS.get(cacheType);static { Map<CacheType, String> mappings = new EnumMap(CacheType.class); mappings.put(CacheType.GENERIC, GenericCacheConfiguration.class.getName()); mappings.put(CacheType.EHCACHE, EhCacheCacheConfiguration.class.getName()); mappings.put(CacheType.HAZELCAST, HazelcastCacheConfiguration.class.getName()); mappings.put(CacheType.INFINISPAN, InfinispanCacheConfiguration.class.getName()); mappings.put(CacheType.JCACHE, JCacheCacheConfiguration.class.getName()); mappings.put(CacheType.COUCHBASE, CouchbaseCacheConfiguration.class.getName()); mappings.put(CacheType.REDIS, RedisCacheConfiguration.class.getName()); mappings.put(CacheType.CAFFEINE, CaffeineCacheConfiguration.class.getName()); mappings.put(CacheType.SIMPLE, SimpleCacheConfiguration.class.getName()); mappings.put(CacheType.NONE, NoOpCacheConfiguration.class.getName()); MAPPINGS = Collections.unmodifiableMap(mappings); }mappings.put(CacheType.REDIS, RedisCacheConfiguration.class.getName());CacheAutoConfiguration会导入RedisCacheConfiguration；// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) // package org.springframework.boot.autoconfigure.cache; import java.util.LinkedHashSet; import java.util.List; import org.springframework.beans.factory.ObjectProvider; import org.springframework.boot.autoconfigure.AutoConfigureAfter; import org.springframework.boot.autoconfigure.cache.CacheProperties.Redis; import org.springframework.boot.autoconfigure.condition.ConditionalOnBean; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration; import org.springframework.cache.CacheManager; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Conditional; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.ResourceLoader; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.cache.RedisCacheManager.RedisCacheManagerBuilder; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer; import org.springframework.data.redis.serializer.RedisSerializationContext.SerializationPair; @Configuration( proxyBeanMethods = false ) @ConditionalOnClass({RedisConnectionFactory.class}) @AutoConfigureAfter({RedisAutoConfiguration.class}) @ConditionalOnBean({RedisConnectionFactory.class}) @ConditionalOnMissingBean({CacheManager.class}) @Conditional({CacheCondition.class}) class RedisCacheConfiguration { RedisCacheConfiguration() { } @Bean RedisCacheManager cacheManager(CacheProperties cacheProperties, CacheManagerCustomizers cacheManagerCustomizers, ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration, ObjectProvider<RedisCacheManagerBuilderCustomizer> redisCacheManagerBuilderCustomizers, RedisConnectionFactory redisConnectionFactory, ResourceLoader resourceLoader) { RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory).cacheDefaults(this.determineConfiguration(cacheProperties, redisCacheConfiguration, resourceLoader.getClassLoader())); List<String> cacheNames = cacheProperties.getCacheNames(); if (!cacheNames.isEmpty()) { builder.initialCacheNames(new LinkedHashSet(cacheNames)); } if (cacheProperties.getRedis().isEnableStatistics()) { builder.enableStatistics(); } redisCacheManagerBuilderCustomizers.orderedStream().forEach((customizer) -> { customizer.customize(builder); }); return (RedisCacheManager)cacheManagerCustomizers.customize(builder.build()); } private org.springframework.data.redis.cache.RedisCacheConfiguration determineConfiguration(CacheProperties cacheProperties, ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration, ClassLoader classLoader) { return (org.springframework.data.redis.cache.RedisCacheConfiguration)redisCacheConfiguration.getIfAvailable(() -> { return this.createConfiguration(cacheProperties, classLoader); }); } private org.springframework.data.redis.cache.RedisCacheConfiguration createConfiguration(CacheProperties cacheProperties, ClassLoader classLoader) { Redis redisProperties = cacheProperties.getRedis(); org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration.defaultCacheConfig(); config = config.serializeValuesWith(SerializationPair.fromSerializer(new JdkSerializationRedisSerializer(classLoader))); if (redisProperties.getTimeToLive() != null) { config = config.entryTtl(redisProperties.getTimeToLive()); } if (redisProperties.getKeyPrefix() != null) { config = config.prefixCacheNameWith(redisProperties.getKeyPrefix()); } if (!redisProperties.isCacheNullValues()) { config = config.disableCachingNullValues(); } if (!redisProperties.isUseKeyPrefix()) { config = config.disableKeyPrefix(); } return config; } } 关注里面的方法：@Bean RedisCacheManager cacheManager(CacheProperties cacheProperties, CacheManagerCustomizers cacheManagerCustomizers, ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration, ObjectProvider<RedisCacheManagerBuilderCustomizer> redisCacheManagerBuilderCustomizers, RedisConnectionFactory redisConnectionFactory, ResourceLoader resourceLoader) { RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory).cacheDefaults(this.determineConfiguration(cacheProperties, redisCacheConfiguration, resourceLoader.getClassLoader())); List<String> cacheNames = cacheProperties.getCacheNames(); if (!cacheNames.isEmpty()) { builder.initialCacheNames(new LinkedHashSet(cacheNames)); } if (cacheProperties.getRedis().isEnableStatistics()) { builder.enableStatistics(); } redisCacheManagerBuilderCustomizers.orderedStream().forEach((customizer) -> { customizer.customize(builder); }); return (RedisCacheManager)cacheManagerCustomizers.customize(builder.build()); }相当于自动配置好了缓存管理器RedisCacheManager，cacheProperties.getCacheNames();方法会读取yml里面的配置，接着初始化缓存builder.initialCacheNames(new LinkedHashSet(cacheNames)); public RedisCacheManager.RedisCacheManagerBuilder initialCacheNames(Set<String> cacheNames) { Assert.notNull(cacheNames, "CacheNames must not be null!"); cacheNames.forEach((it) -> { this.withCacheConfiguration(it, this.defaultCacheConfiguration); }); return this; }this.withCacheConfiguration(it, this.defaultCacheConfiguration);public RedisCacheManager.RedisCacheManagerBuilder withCacheConfiguration(String cacheName, RedisCacheConfiguration cacheConfiguration) { Assert.notNull(cacheName, "CacheName must not be null!"); Assert.notNull(cacheConfiguration, "CacheConfiguration must not be null!"); this.initialCaches.put(cacheName, cacheConfiguration); return this; }RedisCacheConfiguration中默认缓存定义规则：private org.springframework.data.redis.cache.RedisCacheConfiguration createConfiguration(CacheProperties cacheProperties, ClassLoader classLoader) { Redis redisProperties = cacheProperties.getRedis(); org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration.defaultCacheConfig(); config = config.serializeValuesWith(SerializationPair.fromSerializer(new JdkSerializationRedisSerializer(classLoader))); if (redisProperties.getTimeToLive() != null) { config = config.entryTtl(redisProperties.getTimeToLive()); } if (redisProperties.getKeyPrefix() != null) { config = config.prefixCacheNameWith(redisProperties.getKeyPrefix()); } if (!redisProperties.isCacheNullValues()) { config = config.disableCachingNullValues(); } if (!redisProperties.isUseKeyPrefix()) { config = config.disableKeyPrefix(); } return config; }redisProperties也就是从yml中得到的配置。4、配置需要配置的地方：配置使用redis作为缓存spring.cache.type=redis使用缓存，官方文档 https://docs.spring.io/spring-framework/docs/5.3.18-SNAPSHOT/reference/html/integration.html#cache重点关注几个注解：@Cacheable: Triggers cache population. @CacheEvict: Triggers cache eviction. @CachePut: Updates the cache without interfering with the method execution. @Caching: Regroups multiple cache operations to be applied on a method. @CacheConfig: Shares some common cache-related settings at class-level.@Cacheable: Triggers cache population.触发将数据保存到缓存的操作@CacheEvict: Triggers cache eviction.触发将数据从缓存删除的操作@CachePut: Updates the cache without interfering with the method execution.不影响方法执行更新缓存@Caching: Regroups multiple cache operations to be applied on a method.组合以上多个操作@CacheConfig: Shares some common cache-related settings at class-level.在类级别共享缓存的相同配置5、自定义规则第一步、启动类上开启缓存功能：@EnableCaching第二部、只需要注解就能完成缓存操作@Cacheable：1、代表当前方法的结果需要缓存，如果缓存中有，方法不用调用。如果缓存中没有，会调用方法，最后将方法的结果放入缓存。2、每一个需要缓存的数据我们都来指定要翻到那个名字的缓存【缓存的分区，推荐按照业务类型分】。3、key默认自动生成，value默认是使用jdk默认序列化机制。默认时间是-1，永不过期。因此需要我们自定义规则：自定义规则/** * @description: Cache redis数据格式配置 * @date: 2022/2/17 21:59 * @version: 1.0 */ import com.alibaba.fastjson.support.spring.GenericFastJsonRedisSerializer; import org.springframework.boot.autoconfigure.cache.CacheProperties; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.cache.annotation.EnableCaching; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.cache.RedisCacheConfiguration; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.RedisSerializationContext; import org.springframework.data.redis.serializer.StringRedisSerializer; @EnableConfigurationProperties(CacheProperties.class) @Configuration @EnableCaching public class MyCacheConfig { @Bean RedisCacheConfiguration redisCacheConfiguration(CacheProperties cacheProperties){ RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig(); config = config.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer())); config = config.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericFastJsonRedisSerializer())); CacheProperties.Redis redisProperties = cacheProperties.getRedis(); if (redisProperties.getTimeToLive() != null) { config = config.entryTtl(redisProperties.getTimeToLive()); } // if (redisProperties.getKeyPrefix() != null) { // config = config.prefixCacheNameWith(redisProperties.getKeyPrefix()); // } if (!redisProperties.isCacheNullValues()) { config = config.disableCachingNullValues(); } if (!redisProperties.isUseKeyPrefix()) { config = config.disableKeyPrefix(); } return config; } }6、使用示例// 使用缓存注解方式，key：为方法名 @Override @Cacheable(value = {"record"},key = "#root.method.name") public RecordEntity getRecordAllInfoById(Long id) { //未使用注解缓存方案 // RecordEntity recordEntity = null; // // ValueOperations<String, String> forValue = redisTemplate.opsForValue(); // String recordData = forValue.get("RecordData"); // if(recordData==null){ // System.out.println("缓存没数据,执行查询数据库方法。。。。"); // recordEntity = getEntityByIdByFbsRedisson(id); // }else{ // System.out.println("从缓存中获取数据。。。。。"); // recordEntity = JSON.parseObject(recordData, new TypeReference<RecordEntity>() { // }); // } //使用注解缓存后 RecordEntity recordEntity = getEntityById(id); if(recordEntity!=null){ Long categoryId = recordEntity.getCategoryId(); Long[] catelogPath = findCatelogPath(categoryId); recordEntity.setCatelogPath(catelogPath); } return recordEntity; }key使用SPEL表达式规则可参考官网中 Using Custom Annotations使用规则。https://docs.spring.io/spring-framework/docs/5.3.18-SNAPSHOT/reference/html/integration.html#cache-annotation-stereotype

SpringBoot整合定时任务和异步任务 SpringBoot整合定时任务和异步任务一、定时任务SpringBoot整合quartz-scheduler，执行定时任务。1、开启定时任务@EnableScheduling2、开启一个定时任务@Scheduled3、编写cron表达式cron表达式格式请参考官方文档4、实例package com.yanxizhu.ifamily.booking.controller.scheduler; import lombok.extern.slf4j.Slf4j; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; /** * SpringBoot整合Scheduling定时任务 * @author: <a href="mailto:batis@foxmail.com">清风</a> * @date: 2022/3/15 20:26 * @version: 1.0 */ @Slf4j @Component @EnableScheduling public class MyScheduler { /** * cron表达式 */ @Scheduled(cron = "1/3 1/1 * * * ? ") public void sayHell(){ log.info("Hello"); } }5、定时任务总结1、@EnableScheduling 开启一个定时任务2、@Scheduled 开启一个定时任务3、编写定时规则，也就是cron表达式。6、注意事项spring中6位组成，不允许第7位的年。在周几的位置，1-7代表周一到周日，MON-SUN定时任务不应该阻塞，默认时阻塞的，应该以异步任务执行。7、解决方案解决定时任务阻塞问题：使用异步+定时任务二、异步任务执行几种方式1、异步方式提交线程池可以让业务运行以异步的方式，自己提交到线程池(CompletableFuture异步编排)。@Slf4j @Component @EnableScheduling public class MyScheduler { public static ExecutorService executorService = Executors.newFixedThreadPool(10); /** * cron表达式 */ @Scheduled(cron = "1/3 1/1 * * * ? ") public void sayHell(){ CompletableFuture.runAsync(()->{ //调用server业务方法 }, executorService); } }2、定时任务线程池支持定时任务线程池(定时任务线程池)。Scheduling自动配置类，默认只有1个线程。// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) // package org.springframework.boot.autoconfigure.task; import java.util.concurrent.ScheduledExecutorService; import org.springframework.beans.factory.ObjectProvider; import org.springframework.boot.LazyInitializationExcludeFilter; import org.springframework.boot.autoconfigure.AutoConfigureAfter; import org.springframework.boot.autoconfigure.condition.ConditionalOnBean; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.boot.autoconfigure.task.TaskSchedulingProperties.Shutdown; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.boot.task.TaskSchedulerBuilder; import org.springframework.boot.task.TaskSchedulerCustomizer; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.TaskScheduler; import org.springframework.scheduling.annotation.SchedulingConfigurer; import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler; @ConditionalOnClass({ThreadPoolTaskScheduler.class}) @Configuration( proxyBeanMethods = false ) @EnableConfigurationProperties({TaskSchedulingProperties.class}) @AutoConfigureAfter({TaskExecutionAutoConfiguration.class}) public class TaskSchedulingAutoConfiguration { public TaskSchedulingAutoConfiguration() { } @Bean @ConditionalOnBean( name = {"org.springframework.context.annotation.internalScheduledAnnotationProcessor"} ) @ConditionalOnMissingBean({SchedulingConfigurer.class, TaskScheduler.class, ScheduledExecutorService.class}) public ThreadPoolTaskScheduler taskScheduler(TaskSchedulerBuilder builder) { return builder.build(); } @Bean public static LazyInitializationExcludeFilter scheduledBeanLazyInitializationExcludeFilter() { return new ScheduledBeanLazyInitializationExcludeFilter(); } @Bean @ConditionalOnMissingBean public TaskSchedulerBuilder taskSchedulerBuilder(TaskSchedulingProperties properties, ObjectProvider<TaskSchedulerCustomizer> taskSchedulerCustomizers) { TaskSchedulerBuilder builder = new TaskSchedulerBuilder(); builder = builder.poolSize(properties.getPool().getSize()); Shutdown shutdown = properties.getShutdown(); builder = builder.awaitTermination(shutdown.isAwaitTermination()); builder = builder.awaitTerminationPeriod(shutdown.getAwaitTerminationPeriod()); builder = builder.threadNamePrefix(properties.getThreadNamePrefix()); builder = builder.customizers(taskSchedulerCustomizers); return builder; } }默认只有一个线程package org.springframework.boot.autoconfigure.task; import java.time.Duration; import org.springframework.boot.context.properties.ConfigurationProperties; @ConfigurationProperties("spring.task.scheduling") public class TaskSchedulingProperties { private final TaskSchedulingProperties.Pool pool = new TaskSchedulingProperties.Pool(); private final TaskSchedulingProperties.Shutdown shutdown = new TaskSchedulingProperties.Shutdown(); private String threadNamePrefix = "scheduling-"; public TaskSchedulingProperties() { } public TaskSchedulingProperties.Pool getPool() { return this.pool; } public TaskSchedulingProperties.Shutdown getShutdown() { return this.shutdown; } public String getThreadNamePrefix() { return this.threadNamePrefix; } public void setThreadNamePrefix(String threadNamePrefix) { this.threadNamePrefix = threadNamePrefix; } public static class Shutdown { private boolean awaitTermination; private Duration awaitTerminationPeriod; public Shutdown() { } public boolean isAwaitTermination() { return this.awaitTermination; } public void setAwaitTermination(boolean awaitTermination) { this.awaitTermination = awaitTermination; } public Duration getAwaitTerminationPeriod() { return this.awaitTerminationPeriod; } public void setAwaitTerminationPeriod(Duration awaitTerminationPeriod) { this.awaitTerminationPeriod = awaitTerminationPeriod; } } public static class Pool { private int size = 1; public Pool() { } public int getSize() { return this.size; } public void setSize(int size) { this.size = size; } } }配置线程池数量spring.task.scheduling.pool.size=5这样定时任务就有5个线程可以执行了，如果1个线程，定时任务就会阻塞。3、让定时任务执行@EnableAsync 开启异步任务功能@Async 在希望异步执行的方法开启异步执行注解，普通方法也可以使用。默认线程数8异步任务自动配置类源码：// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) // package org.springframework.boot.autoconfigure.task; import java.util.concurrent.Executor; import java.util.stream.Stream; import org.springframework.beans.factory.ObjectProvider; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.boot.autoconfigure.task.TaskExecutionProperties.Pool; import org.springframework.boot.autoconfigure.task.TaskExecutionProperties.Shutdown; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.boot.task.TaskExecutorBuilder; import org.springframework.boot.task.TaskExecutorCustomizer; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Lazy; import org.springframework.core.task.TaskDecorator; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; @ConditionalOnClass({ThreadPoolTaskExecutor.class}) @Configuration( proxyBeanMethods = false ) @EnableConfigurationProperties({TaskExecutionProperties.class}) public class TaskExecutionAutoConfiguration { public static final String APPLICATION_TASK_EXECUTOR_BEAN_NAME = "applicationTaskExecutor"; public TaskExecutionAutoConfiguration() { } @Bean @ConditionalOnMissingBean public TaskExecutorBuilder taskExecutorBuilder(TaskExecutionProperties properties, ObjectProvider<TaskExecutorCustomizer> taskExecutorCustomizers, ObjectProvider<TaskDecorator> taskDecorator) { Pool pool = properties.getPool(); TaskExecutorBuilder builder = new TaskExecutorBuilder(); builder = builder.queueCapacity(pool.getQueueCapacity()); builder = builder.corePoolSize(pool.getCoreSize()); builder = builder.maxPoolSize(pool.getMaxSize()); builder = builder.allowCoreThreadTimeOut(pool.isAllowCoreThreadTimeout()); builder = builder.keepAlive(pool.getKeepAlive()); Shutdown shutdown = properties.getShutdown(); builder = builder.awaitTermination(shutdown.isAwaitTermination()); builder = builder.awaitTerminationPeriod(shutdown.getAwaitTerminationPeriod()); builder = builder.threadNamePrefix(properties.getThreadNamePrefix()); Stream var10001 = taskExecutorCustomizers.orderedStream(); var10001.getClass(); builder = builder.customizers(var10001::iterator); builder = builder.taskDecorator((TaskDecorator)taskDecorator.getIfUnique()); return builder; } @Lazy @Bean( name = {"applicationTaskExecutor", "taskExecutor"} ) @ConditionalOnMissingBean({Executor.class}) public ThreadPoolTaskExecutor applicationTaskExecutor(TaskExecutorBuilder builder) { return builder.build(); } }默认线程8package org.springframework.boot.autoconfigure.task; import java.time.Duration; import org.springframework.boot.context.properties.ConfigurationProperties; @ConfigurationProperties("spring.task.execution") public class TaskExecutionProperties { private final TaskExecutionProperties.Pool pool = new TaskExecutionProperties.Pool(); private final TaskExecutionProperties.Shutdown shutdown = new TaskExecutionProperties.Shutdown(); private String threadNamePrefix = "task-"; public TaskExecutionProperties() { } public TaskExecutionProperties.Pool getPool() { return this.pool; } public TaskExecutionProperties.Shutdown getShutdown() { return this.shutdown; } public String getThreadNamePrefix() { return this.threadNamePrefix; } public void setThreadNamePrefix(String threadNamePrefix) { this.threadNamePrefix = threadNamePrefix; } public static class Shutdown { private boolean awaitTermination; private Duration awaitTerminationPeriod; public Shutdown() { } public boolean isAwaitTermination() { return this.awaitTermination; } public void setAwaitTermination(boolean awaitTermination) { this.awaitTermination = awaitTermination; } public Duration getAwaitTerminationPeriod() { return this.awaitTerminationPeriod; } public void setAwaitTerminationPeriod(Duration awaitTerminationPeriod) { this.awaitTerminationPeriod = awaitTerminationPeriod; } } public static class Pool { private int queueCapacity = 2147483647; private int coreSize = 8; private int maxSize = 2147483647; private boolean allowCoreThreadTimeout = true; private Duration keepAlive = Duration.ofSeconds(60L); public Pool() { } public int getQueueCapacity() { return this.queueCapacity; } public void setQueueCapacity(int queueCapacity) { this.queueCapacity = queueCapacity; } public int getCoreSize() { return this.coreSize; } public void setCoreSize(int coreSize) { this.coreSize = coreSize; } public int getMaxSize() { return this.maxSize; } public void setMaxSize(int maxSize) { this.maxSize = maxSize; } public boolean isAllowCoreThreadTimeout() { return this.allowCoreThreadTimeout; } public void setAllowCoreThreadTimeout(boolean allowCoreThreadTimeout) { this.allowCoreThreadTimeout = allowCoreThreadTimeout; } public Duration getKeepAlive() { return this.keepAlive; } public void setKeepAlive(Duration keepAlive) { this.keepAlive = keepAlive; } } }通过配置线程池线程数spring.task.execution.pool.core-size=5 spring.task.execution.pool.max-size=50实列import lombok.extern.slf4j.Slf4j; import org.springframework.scheduling.annotation.Async; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; @Slf4j @Component @EnableAsync @EnableScheduling public class MyScheduler { public static ExecutorService executorService = Executors.newFixedThreadPool(10); /** * cron表达式 */ @Async @Scheduled(cron = "1/3 1/1 * * * ? ") public void sayHell(){ System.out.println("Hello ...."); } }要用线程池的时候，自己注入即可用了。

SpringBoot整合Sleuth+Zipkin 服务链路追踪 SpringBoot整合Sleuth+Zipkin 服务链路追踪一、整合 Sleu1、服务提供者与消费者导入依赖<!--整合 Sleut:服务提供者与消费者导入依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-sleuth</artifactId> <version>3.1.1</version> </dependency>2、打开 debug 日志logging: level: org.springframework.cloud.openfeign: debug org.springframework.cloud.sleuth: debug3、发起一次远程调用，观察控制台DEBUG [user-service,541450f08573fff5,541450f08573fff5,false]user-service：服务名 541450f08573fff5：是 TranceId，一条链路中，只有一个 TranceId 541450f08573fff5：是 spanId，链路中的基本工作单元 id false：表示是否将数据输出到其他服务，true 则会把信息输出到其他可视化的服务上观察二、整合 zipkin 可视化观察1、docker 安装 zipkin 服务器docker run --name zipkin -d -p 9411:9411 openzipkin/zipkin设置随docker启动docker update --restart=always zipkin2、导入依赖<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-zipkin</artifactId> <version>2.2.8.RELEASE</version> </dependency>因为spring-cloud-starter-zipkin中引入了spring-cloud-starter-sleuth，因此上面的spring-cloud-starter-sleuth可以不用引入。3、添加 zipkin 相关配置spring: application: name: ifamily-booking zipkin: base-url: http://127.0.0.1:9411/ # zipkin 服务器的地址 # 关闭服务发现，否则 Spring Cloud 会把 zipkin 的 url 当做服务名称 discoveryClientEnabled: false sender: type: web # 设置使用 http 的方式传输数据 sleuth: sampler: probability: 1 # 设置抽样采集率为 100%，默认为 0.1，即 10%4、查看通过http://127.0.0.1:9411即可查看链路追踪信息。三、持久化链路追踪数据到ES启动命令docker run --env STORAGE_TYPE=elasticsearch --env ES_HOSTS=192.168.56.10:9200 openzipkin/zipkin-dependencies注意：这个是openzipkin/zipkin-dependencies，改版后的。

SpringBoot整合Sentinel SpringBoot整合Sentinel1、引入依赖<dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId> </dependency>2、下载安装Sentinel可视化控制台下载自己引入sentinel对应的核心包版本，下载地址：https://github.com/alibaba/Sentinel/releases运行Sentinel可视化控制台java -jar sentinel-dashboard-1.8.1.jar注意自己的版本。打开http://127.0.0.1:8080/，默认账号密码sentinel3、微服务配置sentinelapplication.ymlspring: cloud: sentinel: transport: port: 8719 dashboard: localhost:8080port: 8719端口随意，只要不被占用，用于各微服务与控制台通讯。4、查看监控信息启动微服务，随意访问一个接口，Sentinel控制台即可看到实施监控信息。5、启用相关功能可在Sentinel控制台调整相应功能。默认所有流控设置都是保存在内存中，重启服务就没有了。6、添加监控图标引入审计start，sentinel会自动根据spring-boot-starter-actuator监控。<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> <version>2.6.1</version> </dependency>开启监控图标management.endpoints.web.exposure.include=*7、自定义流控返回提示信息import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler; import com.alibaba.csp.sentinel.slots.block.BlockException; import com.alibaba.fastjson.JSON; import com.yanxizhu.common.utils.R; import org.springframework.context.annotation.Configuration; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * @description: Sentinel流控信息提示自定i * @author: <a href="mailto:batis@foxmail.com">清风</a> * @date: 2022/3/13 20:14 * @version: 1.0 */ @Configuration public class MySentinelConfig implements BlockExceptionHandler { @Override public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, BlockException e) throws Exception { R r = R.error(10000, "自定义提示"); httpServletResponse.setContentType("application/json;charset=utf-8"); httpServletResponse.getWriter().write(JSON.toJSONString(r)); } }限流规则可参考官网限流文档。每一个微服务都有一个自己的自定义流控返回提示信息，其它配置一样，只是提示信息不同。8、熔断、降级针对Feign远程调用熔断引入Feign远程调用依赖<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>打开 Sentinel 对 Feign 的支持：feign.sentinel.enabled=true熔断实现@FeignClient(value = "renren-fast",fallback = SeckillFeignServiceFallBack.class) public interface CardFeignService { @GetMapping("/sys/user/list") public R list(@RequestParam Map<String, Object> params); }熔断回调@S1f4j @Component public class SeckillFeignServiceFallBack implements SeckillFeignService{ @Override public R getskuseckillInfo(Long skuld) { Log.info("熔断方法调用...getskuSecki11Info"); return R.error(com.yanxizhu.family.common.exception.BizCodeEnume.TOO_MWANY_REQUEST.getCode(); com.yanxizhu.family.common.exception.BizCodeEnume.TOO_MANY_REQUEST.getAsg()); } }调用方：手动指定远程服务的降级策略。远程服务被降级处理。触发我们的熔断回调方法。提供方：超大浏览的时侯，必须牺牲一些远程服务。在服务的提供方（远程服务）指定降级策略；提供方是在运行。但是不运行自己的业务逻辑，返回的是默认的降级数据（限流的数据）。@SentinelResource 注解用来标识资源是否被限流、降级。上述例子上该注解的属性 sayHello 表示资源名。@SentinelResource 还提供了其它额外的属性如 blockHandler，blockHandlerClass，fallback 用于表示限流或降级的操作（注意有方法签名要求），更多内容可以参考 Sentinel 注解支持文档。若不配置 blockHandler、fallback 等函数，则被流控降级时方法会直接抛出对应的 BlockException；若方法未定义 throws BlockException 则会被 JVM 包装一层 UndeclaredThrowableException。注：一般推荐将 @SentinelResource 注解加到服务实现上，而在 Web 层直接使用 Spring Cloud Alibaba 自带的 Web 埋点适配。Sentinel Web 适配同样支持配置自定义流控处理逻辑，参考 相关文档。9、自定义受保护的资源1）、代码try（Entry entry =SphU.entry（"seckillSkus"））（/业务逻辑catch（Execption e）（}2）、基于注解。eSentinelResource（value ="getCurrentSeckiLLSkusResource"，blockHandler ="blockHandler"）无论是1，2方式一定要配置被限流以后的默认返回注：一般推荐将 @SentinelResource 注解加到服务实现上，而在 Web 层直接使用 Spring Cloud Alibaba 自带的 Web 埋点适配。Sentinel Web 适配同样支持配置自定义流控处理逻辑，参考 相关文档。10、网关限流引入网关sentinel依赖<dependency> <groupId>com.alibaba.csp</groupId> <artifactId>sentinel-spring-cloud-gateway-adapter</artifactId> <version>x.y.z</version> </dependency>使用时只需注入对应的 SentinelGatewayFilter 实例以及 SentinelGatewayBlockExceptionHandler 实例即可（若使用了 Spring Cloud Alibaba Sentinel，则只需按照文档进行配置即可，无需自己加 Configuration）。更多网关限流可参考官方文档11、定制网关流控返回参考官方文档

Springboot整合SpringSession，解决分布式session共享问题 springboot整合SpringSession1、引入依赖<dependencies> <dependency> <groupId>org.springframework.session</groupId> <artifactId>spring-session-data-redis</artifactId> </dependency> </dependencies>2、springboot配置application.properties配置：保存类型spring.session.store-type=redis # Session store type.session过期时间：server.servlet.session.timeout= # Session timeout. If a duration suffix is not specified, seconds is used.其它配置信息可参考官网：spring.session.redis.flush-mode=on_save # Sessions flush mode. spring.session.redis.namespace=spring:session # Namespace for keys used to store sessions.连接信息配置：spring.redis.host=localhost # Redis server host. spring.redis.password= # Login password of the redis server. spring.redis.port=6379 # Redis server port.3、开启springSession主类加上注解@EnableRedisHttpSession@EnableRedisHttpSession4、使用注意：1、需要保存到redis中的数据必须序列化。2、需要实现session共享的微服务都必须整合SpringSession。5、解决子域session共享、cookie进行json序列化MySessionConfig配置package com.yanxizhu.family.booking.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.RedisSerializer; import org.springframework.session.web.http.CookieSerializer; import org.springframework.session.web.http.DefaultCookieSerializer; /** * @description: springSession配置 * @author: <a href="mailto:batis@foxmail.com">清风</a> * @date: 2022/3/10 20:11 * @version: 1.0 */ @Configuration public class MySessionConfig { @Bean public CookieSerializer cookieSerializer(){ DefaultCookieSerializer defaultCookieSerializer = new DefaultCookieSerializer(); //设置共享域名 defaultCookieSerializer.setDomainName("yanxizhu.com"); //设置session名称 defaultCookieSerializer.setCookieName("YANXIZHUSESSION"); return defaultCookieSerializer; } //session序列化机制 @Bean public RedisSerializer<Object> springSessionDefaultRedisSerializer(){ return new GenericJackson2JsonRedisSerializer(); } }注意：需要session共享的微服务都需要配置，或者抽取到公共模块。6、多系统-session共享问题(单点登录)抽取单独的认证中心微服务处理单点登录单点登录，可参考一个开源单点登录项目，许雪里/xxl-sso