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公司要求redis配置密码使用密文，但是程序使用的是spring默认的redisTemplate，那么就需要修改配置实现密码加解密。
先搞个加密工具类：

public class SM2Encryptor {// 加密，使用公钥public static String encryptText(String publicKey, String originalText) throws Exception {//...为null判断return Sm2.doEncrypt(originalText, publicKey);}//解密，使用私钥public static String decryptText(String privateKey, String cipherText) throws Exception {//...为null判断return Sm2.doDecrypt(cipherText, privateKey);}// 生成密钥对方法//...
}

1. Redis默认配置

最简单的使用其实开箱即可用，添加依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

本机启动redis，一切采用默认的配置 （host:127.0.0.1, port:6379, 无密码)

然后就可以直接注入redisTemplate实例，进行各种读写操作

@SpringBootApplication
public class Application {public Application(RedisTemplate<String, String> redisTemplate) {redisTemplate.opsForValue().set("hello", "world");String ans = redisTemplate.opsForValue().get("hello");Assert.isTrue("world".equals(ans));}public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}

2. 自定义配置参数

前面是默认的配置参数，在实际的使用中，一般都会修改这些默认的配置项，如果我的应用中，只有一个redis，那么完全可以只修改默认的配置参数
修改配置文件: application.yml

spring:redis:host: 127.0.0.1port: 6379password:database: 0lettuce:pool:max-active: 32max-wait: 300msmax-idle: 16min-idle: 8

使用和前面没有什么区别，直接通过注入RedisTemplate来操作即可，需要额外注意的是设置了连接池的相关参数，需要额外引入依赖

<dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId>
</dependency>

3. 多redis配置

依赖多个不同的redis，也就是说我的项目需要从多个redis实例中获取数据，这种时候，就不能直接使用默认的，需要我们自己来声明ConnectionFactory和 RedisTemplate

spring:redis:host: 127.0.0.1port: 6379password:lettuce:pool:max-active: 32max-wait: 300max-idle: 16min-idle: 8database: 0local-redis:host: 127.0.0.1port: 6379database: 0password:lettuce:pool:max-active: 16max-wait: 100max-idle: 8min-idle: 4

对应的配置类，采用Lettuce，基本设置如下，套路都差不多，先读取配置，初始化ConnectionFactory，然后创建RedisTemplate实例，设置连接工厂

@Configuration
public class RedisAutoConfig {@Beanpublic LettuceConnectionFactory defaultLettuceConnectionFactory(RedisStandaloneConfiguration defaultRedisConfig,GenericObjectPoolConfig defaultPoolConfig) {LettuceClientConfiguration clientConfig =LettucePoolingClientConfiguration.builder().commandTimeout(Duration.ofMillis(100)).poolConfig(defaultPoolConfig).build();return new LettuceConnectionFactory(defaultRedisConfig, clientConfig);}@Beanpublic RedisTemplate<String, String> defaultRedisTemplate(LettuceConnectionFactory defaultLettuceConnectionFactory) {RedisTemplate<String, String> redisTemplate = new RedisTemplate<>();redisTemplate.setConnectionFactory(defaultLettuceConnectionFactory);redisTemplate.afterPropertiesSet();return redisTemplate;}@Bean@ConditionalOnBean(name = "localRedisConfig")public LettuceConnectionFactory localLettuceConnectionFactory(RedisStandaloneConfiguration localRedisConfig,GenericObjectPoolConfig localPoolConfig) {LettuceClientConfiguration clientConfig =LettucePoolingClientConfiguration.builder().commandTimeout(Duration.ofMillis(100)).poolConfig(localPoolConfig).build();return new LettuceConnectionFactory(localRedisConfig, clientConfig);}@Bean@ConditionalOnBean(name = "localLettuceConnectionFactory")public RedisTemplate<String, String> localRedisTemplate(LettuceConnectionFactory localLettuceConnectionFactory) {RedisTemplate<String, String> redisTemplate = new RedisTemplate<>();redisTemplate.setConnectionFactory(localLettuceConnectionFactory);redisTemplate.afterPropertiesSet();return redisTemplate;}@Configuration@ConditionalOnProperty(name = "host", prefix = "spring.local-redis")public static class LocalRedisConfig {@Value("${spring.local-redis.host:127.0.0.1}")private String host;@Value("${spring.local-redis.port:6379}")private Integer port;@Value("${spring.local-redis.password:}")private String password;@Value("${spring.local-redis.database:0}")private Integer database;@Value("${spring.local-redis.lettuce.pool.max-active:8}")private Integer maxActive;@Value("${spring.local-redis.lettuce.pool.max-idle:8}")private Integer maxIdle;@Value("${spring.local-redis.lettuce.pool.max-wait:-1}")private Long maxWait;@Value("${spring.local-redis.lettuce.pool.min-idle:0}")private Integer minIdle;@Beanpublic GenericObjectPoolConfig localPoolConfig() {GenericObjectPoolConfig config = new GenericObjectPoolConfig();config.setMaxTotal(maxActive);config.setMaxIdle(maxIdle);config.setMinIdle(minIdle);config.setMaxWaitMillis(maxWait);return config;}@Beanpublic RedisStandaloneConfiguration localRedisConfig() {RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();config.setHostName(host);config.setPassword(RedisPassword.of(password));config.setPort(port);config.setDatabase(database);return config;}}@Configurationpublic static class DefaultRedisConfig {@Value("${spring.redis.host:127.0.0.1}")private String host;@Value("${spring.redis.port:6379}")private Integer port;@Value("${spring.redis.password:}")private String password;@Value("${spring.redis.database:0}")private Integer database;@Value("${spring.redis.lettuce.pool.max-active:8}")private Integer maxActive;@Value("${spring.redis.lettuce.pool.max-idle:8}")private Integer maxIdle;@Value("${spring.redis.lettuce.pool.max-wait:-1}")private Long maxWait;@Value("${spring.redis.lettuce.pool.min-idle:0}")private Integer minIdle;private static final String PRIVATEKEY = "4334f34t2t2t54ytw4erg3y245g45wt4qf4";@Beanpublic GenericObjectPoolConfig defaultPoolConfig() {GenericObjectPoolConfig config = new GenericObjectPoolConfig();config.setMaxTotal(maxActive);config.setMaxIdle(maxIdle);config.setMinIdle(minIdle);config.setMaxWaitMillis(maxWait);return config;}@Beanpublic RedisStandaloneConfiguration defaultRedisConfig() {RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();config.setHostName(host);// config.setPassword(RedisPassword.of(password));config.setPassword(SM2Encryptor.decryptText(PRIVATEKEY, password)); // 此处密文需要解密config.setPort(port);config.setDatabase(database);return config;}}
}

测试类如下，简单的演示下两个template的读写

@SpringBootApplication
public class Application {public Application(RedisTemplate<String, String> localRedisTemplate, RedisTemplate<String, String>defaultRedisTemplate)throws InterruptedException {// 10s的有效时间localRedisTemplate.delete("key");localRedisTemplate.opsForValue().set("key", "value", 100, TimeUnit.MILLISECONDS);String ans = localRedisTemplate.opsForValue().get("key");System.out.println("value".equals(ans));TimeUnit.MILLISECONDS.sleep(200);ans = localRedisTemplate.opsForValue().get("key");System.out.println("value".equals(ans) + " >> false ans should be null! ans=[" + ans + "]");defaultRedisTemplate.opsForValue().set("key", "value", 100, TimeUnit.MILLISECONDS);ans = defaultRedisTemplate.opsForValue().get("key");System.out.println(ans);}public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}

重点：

• 注意 localRedisTemplate, defaultRedisTemplate 两个对象不相同（看debug窗口后面的@xxx)
• 同样两个RedisTemplate的ConnectionFactory也是两个不同的实例（即分别对应前面配置类中的两个Factory)
• 执行后输出的结果正如我们预期的redis操作
  • 塞值，马上取出没问题
  • 失效后，再查询，返回null
• 最后输出异常日志，提示如下

Description:
Parameter 0 of method redisTemplate in org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration required a single bean, but 2 were found:- defaultLettuceConnectionFactory: defined by method 'defaultLettuceConnectionFactory' in class path resource [com/git/hui/boot/redis/config/RedisAutoConfig.class]- localLettuceConnectionFactory: defined by method 'localLettuceConnectionFactory' in class path resource [com/git/hui/boot/redis/config/RedisAutoConfig.class]Action:
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

上面表示说有多个ConnectionFactory存在，然后创建默认的RedisTemplate就不知道该选择哪一个了，有两种方法解决：
方法一：指定默认的ConnectionFactory
借助@Primary来指定默认的连接工厂，然后在使用工程的时候，通过@Qualifier注解来显示指定，我需要的工厂是哪个（主要是localRedisTemplate这个bean的定义，如果不加，则会根据defaultLettuceConnectionFactory这个实例来创建Redis连接了）

@Bean
@Primary
public LettuceConnectionFactory defaultLettuceConnectionFactory(RedisStandaloneConfiguration defaultRedisConfig,GenericObjectPoolConfig defaultPoolConfig) {// ...
}@Bean
public RedisTemplate<String, String> defaultRedisTemplate(@Qualifier("defaultLettuceConnectionFactory") LettuceConnectionFactory defaultLettuceConnectionFactory) {// ....
}@Bean
@ConditionalOnBean(name = "localRedisConfig")
public LettuceConnectionFactory localLettuceConnectionFactory(RedisStandaloneConfiguration localRedisConfig,GenericObjectPoolConfig localPoolConfig) {// ...
}@Bean
@ConditionalOnBean(name = "localLettuceConnectionFactory")
public RedisTemplate<String, String> localRedisTemplate(@Qualifier("localLettuceConnectionFactory") LettuceConnectionFactory localLettuceConnectionFactory) {// ...
}

方法二：忽略默认的自动配置类
既然提示的是org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration类加载bean冲突，那么就不加载这个配置即可

@SpringBootApplication
@EnableAutoConfiguration(exclude = {RedisAutoConfiguration.class, RedisReactiveAutoConfiguration.class})
public class Application {// ...
}