详细集成Redis （一）

1.添加依赖

    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
    </dependency>
    
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.38</version>
    </dependency>

2.在application.properties中配置redis

#redis
redis.host=192.168.220.128
redis.port=6379
redis.timeout=3
redis.password=123456
redis.poolMaxTotal=10
redis.poolMaxIdle=10
redis.poolMaxWait=3

3.创建RedisConfig类 对应application.properties中的配置

@Component
@ConfigurationProperties(prefix="redis")
public class RedisConfig {
    private String host;
    private int port;
    private int timeout;//秒
    private String password;
    private int poolMaxTotal;
    private int poolMaxIdle;
    private int poolMaxWait;//秒
    public String getHost() {
        return host;
    }
    public void setHost(String host) {
        this.host = host;
    }
    public int getPort() {
        return port;
    }
    public void setPort(int port) {
        this.port = port;
    }
    public int getTimeout() {
        return timeout;
    }
    public void setTimeout(int timeout) {
        this.timeout = timeout;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getPoolMaxTotal() {
        return poolMaxTotal;
    }
    public void setPoolMaxTotal(int poolMaxTotal) {
        this.poolMaxTotal = poolMaxTotal;
    }
    public int getPoolMaxIdle() {
        return poolMaxIdle;
    }
    public void setPoolMaxIdle(int poolMaxIdle) {
        this.poolMaxIdle = poolMaxIdle;
    }
    public int getPoolMaxWait() {
        return poolMaxWait;
    }
    public void setPoolMaxWait(int poolMaxWait) {
        this.poolMaxWait = poolMaxWait;
    }
}

4.创建RedisServer

@Service
public class RedisService {
    
    @Autowired
    JedisPool jedisPool;
    
    /**
     * 获取当个对象
     * */
    public <T> T get(KeyPrefix prefix, String key,  Class<T> clazz) {
         Jedis jedis = null;
         try {
             jedis =  jedisPool.getResource();
             //生成真正的key
             String realKey  = prefix.getPrefix() + key;
             String  str = jedis.get(realKey);
             T t =  stringToBean(str, clazz);
             return t;
         }finally {
              returnToPool(jedis);
         }
    }
    
    /**
     * 设置对象
     * */
    public <T> boolean set(KeyPrefix prefix, String key,  T value) {
         Jedis jedis = null;
         try {
             jedis =  jedisPool.getResource();
             String str = beanToString(value);
             if(str == null || str.length() <= 0) {
                 return false;
             }
            //生成真正的key
             String realKey  = prefix.getPrefix() + key;
             int seconds =  prefix.expireSeconds();
             if(seconds <= 0) {
                 jedis.set(realKey, str);
             }else {
                 jedis.setex(realKey, seconds, str);
             }
             return true;
         }finally {
              returnToPool(jedis);
         }
    }
    
    /**
     * 判断key是否存在
     * */
    public <T> boolean exists(KeyPrefix prefix, String key) {
         Jedis jedis = null;
         try {
             jedis =  jedisPool.getResource();
            //生成真正的key
             String realKey  = prefix.getPrefix() + key;
            return  jedis.exists(realKey);
         }finally {
              returnToPool(jedis);
         }
    }
    
    /**
     * 增加值
     * */
    public <T> Long incr(KeyPrefix prefix, String key) {
         Jedis jedis = null;
         try {
             jedis =  jedisPool.getResource();
            //生成真正的key
             String realKey  = prefix.getPrefix() + key;
            return  jedis.incr(realKey);
         }finally {
              returnToPool(jedis);
         }
    }
    
    /**
     * 减少值
     * */
    public <T> Long decr(KeyPrefix prefix, String key) {
         Jedis jedis = null;
         try {
             jedis =  jedisPool.getResource();
            //生成真正的key
             String realKey  = prefix.getPrefix() + key;
            return  jedis.decr(realKey);
         }finally {
              returnToPool(jedis);
         }
    }
    
    private <T> String beanToString(T value) {
        if(value == null) {
            return null;
        }
        Class<?> clazz = value.getClass();
        if(clazz == int.class || clazz == Integer.class) {
             return ""+value;
        }else if(clazz == String.class) {
             return (String)value;
        }else if(clazz == long.class || clazz == Long.class) {
            return ""+value;
        }else {
            return JSON.toJSONString(value);
        }
    }

    @SuppressWarnings("unchecked")
    private <T> T stringToBean(String str, Class<T> clazz) {
        if(str == null || str.length() <= 0 || clazz == null) {
             return null;
        }
        if(clazz == int.class || clazz == Integer.class) {
             return (T)Integer.valueOf(str);
        }else if(clazz == String.class) {
             return (T)str;
        }else if(clazz == long.class || clazz == Long.class) {
            return  (T)Long.valueOf(str);
        }else {
            return JSON.toJavaObject(JSON.parseObject(str), clazz);
        }
    }

    private void returnToPool(Jedis jedis) {
         if(jedis != null) {
             jedis.close();
         }
    }

}

5.创建RedisPoolFactory

@Service
public class RedisPoolFactory {

    @Autowired
    RedisConfig redisConfig;
    
    @Bean
    public JedisPool JedisPoolFactory() {
        JedisPoolConfig poolConfig = new JedisPoolConfig();
        poolConfig.setMaxIdle(redisConfig.getPoolMaxIdle());
        poolConfig.setMaxTotal(redisConfig.getPoolMaxTotal());
        poolConfig.setMaxWaitMillis(redisConfig.getPoolMaxWait() * 1000);
        JedisPool jp = new JedisPool(poolConfig, redisConfig.getHost(), redisConfig.getPort(),
                redisConfig.getTimeout()*1000, redisConfig.getPassword(), 0);
        return jp;
    }
    
}

6.在controller中写一个demo

@Controller
@RequestMapping("/demo")
public class SampleController {

    @Autowired
    UserService userService;
    
    @Autowired
    RedisService redisService;
    
    @RequestMapping("/hello")
    @ResponseBody
    public Result<String> home() {
        return Result.success("Hello，world");
    }
    
    @RequestMapping("/error")
    @ResponseBody
    public Result<String> error() {
        return Result.error(CodeMsg.SESSION_ERROR);
    }
    
    @RequestMapping("/hello/themaleaf")
    public String themaleaf(Model model) {
        model.addAttribute("name", "Joshua");
        return "hello";
    }
    
    @RequestMapping("/db/get")
    @ResponseBody
    public Result<User> dbGet() {
        User user = userService.getById(1);
        return Result.success(user);
    }
    
    
    @RequestMapping("/db/tx")
    @ResponseBody
    public Result<Boolean> dbTx() {
        userService.tx();
        return Result.success(true);
    }
    
    @RequestMapping("/redis/get")
    @ResponseBody
    public Result<User> redisGet() {
        User  user  = redisService.get(UserKey.getById, ""+1, User.class);
        return Result.success(user);
    }
    
    @RequestMapping("/redis/set")
    @ResponseBody
    public Result<Boolean> redisSet() {
        User user  = new User();
        user.setId(1);
        user.setName("1111");
        redisService.set(UserKey.getById, ""+1, user);//UserKey:id1
        return Result.success(true);
    }
    
    
}