y進入maven依賴:
<!--spring boot 與redis應用基本環境配置 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-redis</artifactId> </dependency> <!--spring session 與redis應用基本環境配置,需要開啟redis后才可以使用,不然啟動Spring boot會報錯 --> <dependency> <groupId>org.springframework.session</groupId> <artifactId>spring-session-data-redis</artifactId> </dependency>
創建SessionConfig
import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.data.redis.connection.jedis.JedisConnectionFactory; import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession; //這個類用配置redis服務器的連接 //maxInactiveIntervalInSeconds為SpringSession的過期時間(單位:秒)
@Configuration @EnableRedisHttpSession(maxInactiveIntervalInSeconds = 1800) public class SessionConfig { // 冒號后的值為沒有配置文件時,制動裝載的默認值 @Value("${redis.hostname:localhost}") String HostName; @Value("${redis.port:6379}") int Port; @Bean public JedisConnectionFactory connectionFactory() { JedisConnectionFactory connection = new JedisConnectionFactory(); connection.setPort(Port); connection.setHostName(HostName); return connection; } }
初始化Session
public class SessionInitializer extends AbstractHttpSessionApplicationInitializer{ public SessionInitializer() { super(SessionConfig.class); } }
控制器層代碼
import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.SpringApplication; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class SessionController { @Value("${server.port}") private String PORT; public static void main(String[] args) { SpringApplication.run(SessionController.class, args); } @RequestMapping("/index") public String index() { return "index:" + PORT; } // @methodDesc: 功能描述:(往session存放值) @RequestMapping("/setSession") public String setSession(HttpServletRequest request, String sessionKey, String sessionValue) { HttpSession session = request.getSession(true); session.setAttribute(sessionKey, sessionValue); return "success,port:" + PORT; } // @methodDesc: 功能描述:(從Session獲取值) @RequestMapping("/getSession") public String getSession(HttpServletRequest request, String sessionKey) { HttpSession session =null; try { session = request.getSession(false); } catch (Exception e) { e.printStackTrace(); } String value=null; if(session!=null){ value = (String) session.getAttribute(sessionKey); } return "sessionValue:" + value + ",port:" + PORT; } }
配置文件
#redis配置 # Redis數據庫索引(默認為0) spring.redis.database=0 # Redis服務器地址 spring.redis.host=localhost # Redis服務器連接端口 spring.redis.port=6379 #Redis密碼 spring.redis.password=redis密碼 # 連接池最大連接數(使用負值表示沒有限制) spring.redis.pool.max-active=8 # 連接池最大阻塞等待時間(使用負值表示沒有限制) spring.redis.pool.max-wait=-1 # 連接池中的最大空閑連接 spring.redis.pool.max-idle=8 # 連接池中的最小空閑連接 spring.redis.pool.min-idle=0 # 連接超時時間(毫秒) spring.redis.timeout=0 #springboot內置tomcat的端口設置 server.port=8080
redis也可以這樣配置:
@Configuration @EnableCaching//開啟緩存注解 //maxInactiveIntervalInSeconds:session的統一過期時間,默認是1800秒過期,這里測試修改為60秒 @EnableRedisHttpSession(maxInactiveIntervalInSeconds = 60)//注解,開啟redis集中session管理 public class RedisConfig { // 以下redisTemplate自由根據場景選擇 //默認的String-String // @Bean public RedisTemplate RedisTemplate(RedisConnectionFactory factory) { StringRedisTemplate stringRedisTemplate = new StringRedisTemplate(); stringRedisTemplate.setConnectionFactory(factory); return stringRedisTemplate; } @Bean public RedisTemplate<String, Object> RedisTemplate2(RedisConnectionFactory factory) { RedisTemplate<String, Object> template = new RedisTemplate<String, Object>(); template.setConnectionFactory(factory); template.setKeySerializer(new StringRedisSerializer()); //GenericJackson2JsonRedisSerializer方便反序列化,redis中也方便查看json template.setValueSerializer(new GenericJackson2JsonRedisSerializer()); template.setHashKeySerializer(new GenericJackson2JsonRedisSerializer()); template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer()); template.afterPropertiesSet(); return template; } @Bean public RedisTemplate<Object, Object> RedisTemplate3(RedisConnectionFactory factory) { RedisTemplate<Object, Object> template = new RedisTemplate<>(); template.setConnectionFactory(factory); //使用Jackson2JsonRedisSerializer來序列化和反序列化redis的value值(默認使用JDK的序列化方式) Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class); ObjectMapper mapper = new ObjectMapper(); mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); serializer.setObjectMapper(mapper); //使用StringRedisSerializer來序列化和反序列化redis的key值 template.setKeySerializer(new StringRedisSerializer()); //使用Jackson2JsonRedisSerializer來序列化和反序列化redis的value值(默認使用JDK的序列化方式) template.setValueSerializer(serializer); // 設置hash key 和value序列化模式 template.setHashKeySerializer(new StringRedisSerializer()); template.setHashValueSerializer(serializer); template.afterPropertiesSet(); return template; } /** * redis作為緩存 * @param redisTemplate * @return */ @Bean public CacheManager cacheManager(RedisTemplate<String, Object> redisTemplate) { RedisCacheManager rcm = new RedisCacheManager(redisTemplate); // 多個緩存的名稱,目前只定義了一個 rcm.setCacheNames(Arrays.asList("user")); //設置緩存過期時間(秒) rcm.setDefaultExpiration(60); return rcm; } /** * 在springboot中使用spring-session的時候, * 在不同的域名下面需要配置cookie主域否則session共享不生效 * @return */ @Bean public CookieSerializer cookieSerializer() { DefaultCookieSerializer defaultCookieSerializer = new DefaultCookieSerializer(); //cookie名字 defaultCookieSerializer.setCookieName("sessionId"); //不同子域時設置 //defaultCookieSerializer.setDomainName("xxx.com"); //設置各web應用返回的cookiePath一致 defaultCookieSerializer.setCookiePath("/"); return defaultCookieSerializer; } }
集群配置:
spring: redis: cluster: nodes: - Centos6701:6379 - Centos6701:6380 - Centos6702:6380 - Centos6702:6379 - Centos6703:6379 - Centos6703:6380
高並發解決方案
業務數據庫 -》 數據水平分割(分區分表分庫)、讀寫分離
業務應用 -》 邏輯代碼優化(算法優化)、公共數據緩存
應用服務器 -》 反向靜態代理、配置優化、負載均衡(apache分發,多tomcat實例)
系統環境 -》 JVM調優
頁面優化 -》 減少頁面連接數、頁面尺寸瘦身
1、動態資源和靜態資源分離;
2、CDN;
3、負載均衡;
4、分布式緩存;
5、數據庫讀寫分離或數據切分(垂直或水平);
6、服務分布式部署。