Java连接Redis

在Java程序中使用Redis之前，需要确保在机器上安装了Redis的Java驱动程序和Java环境。可以先在将Java电脑上并配置好环境。

安装

现在，让我们看看如何设置Redis Java驱动程序。

• 下载jedis.jar - http://repo1.maven.org/maven2/redis/clients/jedis/2.1.0/jedis-2.1.0-sources.jar ，确保下载的jedis.jar是最新版本。
• 将jedis.jar包含到类路径中。

Java连接到Redis服务器

请参考以下一个简单的示例代码

import redis.clients.jedis.Jedis; 

public class RedisJava { 
   public static void main(String[] args) { 
      //Connecting to Redis server on localhost 
      Jedis jedis = new Jedis("localhost"); 
      System.out.println("Connection to server sucessfully"); 
      //check whether server is running or not 
      System.out.println("Server is running: "+jedis.ping()); 
   } 
}

现在，编译并运行上面的程序来测试与Redis服务器的连接。可以根据需要更改路径。假设jedis.jar的当前版本在当前路径中可以使用。 执行上面代码，将生成以下结果 -

$javac RedisJava.java 
$java RedisJava 
Connection to server sucessfully 
Server is running: PONG

Redis Java字符串示例

import redis.clients.jedis.Jedis; 

public class RedisStringJava { 
   public static void main(String[] args) { 
      //Connecting to Redis server on localhost 
      Jedis jedis = new Jedis("localhost"); 
      System.out.println("Connection to server sucessfully"); 
      //set the data in redis string 
      jedis.set("tutorial-name", "Redis tutorial"); 
      // Get the stored data and print it 
      System.out.println("Stored string in redis:: "+ jedis.get("tutorialname")); 
   } 
}

执行上面代码，将生成以下结果 -

$javac RedisStringJava.java 
$java RedisStringJava 
Connection to server sucessfully 
Stored string in redis:: Redis tutorial

Redis Java列表示例

import redis.clients.jedis.Jedis; 

public class RedisListJava { 
   public static void main(String[] args) { 
      //Connecting to Redis server on localhost 
      Jedis jedis = new Jedis("localhost"); 
      System.out.println("Connection to server sucessfully"); 

      //store data in redis list 
      jedis.lpush("tutorial-list", "Redis"); 
      jedis.lpush("tutorial-list", "Mongodb"); 
      jedis.lpush("tutorial-list", "Mysql"); 
      // Get the stored data and print it 
      List<String> list = jedis.lrange("tutorial-list", 0 ,5); 

      for(int i = 0; i<list.size(); i++) { 
         System.out.println("Stored string in redis:: "+list.get(i)); 
      } 
   } 
}

执行上面代码，将生成以下结果 -

$javac RedisListJava.java 
$java RedisListJava 
Connection to server sucessfully 
Stored string in redis:: Redis 
Stored string in redis:: Mongodb 
Stored string in redis:: Mysql

import redis.clients.jedis.Jedis; 

public class RedisKeyJava { 
   public static void main(String[] args) { 
      //Connecting to Redis server on localhost 
      Jedis jedis = new Jedis("localhost"); 
      System.out.println("Connection to server sucessfully"); 
      //store data in redis list 
      // Get the stored data and print it 
      List<String> list = jedis.keys("*"); 

      for(int i = 0; i<list.size(); i++) { 
         System.out.println("List of stored keys:: "+list.get(i)); 
      } 
   } 
}

执行上面代码，将生成以下结果 -

$javac RedisKeyJava.java 
$java RedisKeyJava 
Connection to server sucessfully 
List of stored keys:: tutorial-name 
List of stored keys:: tutorial-list


设置redis 服务器连接对象
 /**
  * redisCoonection
  */
 @Bean(name = "shiroConnFactiory")
 public JedisConnectionFactory connectionFactory() {
  JedisConnectionFactory conn = new JedisConnectionFactory();
  conn.setDatabase(redisDatabase);
  conn.setHostName(redisHost);
  conn.setPassword(redisPassword);
  conn.setPort(redisPort);
  conn.setTimeout(redisTimeout);
  return conn;
 }



 /**
  * redisTemplate
  */
 @Bean(name = "redisTemplate")
 public RedisTemplate<byte[], Object> redisTemplate() {
  RedisTemplate<byte[], Object> template = new RedisTemplate<>();
  template.setConnectionFactory(connectionFactory());
  return template;
 }

 /**
  * redisCacheManager
  */
 @Bean(name = "shrioRedisCacheManager")
 @DependsOn(value = "redisTemplate")
 public ShrioRedisCacheManager redisCacheManager() {
  ShrioRedisCacheManager cacheManager = new ShrioRedisCacheManager(redisTemplate());
  return cacheManager;
 }

/**
 * 项目名：onway
 * 包名：com.pactera.commons.redis
 * 文件名：RedisUtil.java
 * 版本信息：1.0.0
 * 日期：2016年12月7日-下午7:01:40
 * Copyright (c) 2016 Pactera 版权所有
 */
 
package com.pactera.commons.redis;

import java.io.Serializable;
import java.util.Set;
import java.util.concurrent.TimeUnit;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;

/**
 * 类名称：RedisUtil
 * 类描述：redicache 工具类
 * 创建人：lee
 * 创建时间：2016年12月7日 下午7:01:40
 * @version 1.0.0
 */
@Component
public class RedisUtil {
    
    @Autowired
    private RedisTemplate redisTemplate;
    
    /**
     * 批量删除对应的value
     * 
     * @param keys
     */
    public void remove(final String... keys) {
        for (String key : keys) {
            remove(key);
        }
    }
    
    /**
     * 批量删除key
     * @param pattern
     */
    public void removePattern(final String pattern) {
        Set<Serializable> keys = redisTemplate.keys(pattern);
        if (keys.size() > 0)
        redisTemplate.delete(keys);
    }
    
    /**
     * 删除对应的value
     * @param key
     */
    public void remove(final String key) {
        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }
    
    /**
     * 判断缓存中是否有对应的value
     * 
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return redisTemplate.hasKey(key);
    }
    
    /**
     * 读取缓存
     * @param key
     * @return
     */
    public Object get(final String key) {
        Object result = null;
        ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
        result = operations.get(key);
        return result;
    }
    
    /**
     * 写入缓存
     * 
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            result = true;
        } catch (Exception e) {
        e.printStackTrace();
        }
        return result;
    }
    
    /**
     * 写入缓存
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value, Long expireTime) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

/**
 * 项目名：onway
 * 包名：com.pactera.commons.redis
 * 文件名：RedisConfig.java
 * 版本信息：1.0.0
 * 日期：2016年12月7日-下午6:57:43
 * Copyright (c) 2016 Pactera 版权所有
 */
 
package com.pactera.commons.redis;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * 类名称：RedisConfig
 * 类描述：redis 缓存管理
 * 创建人：lee
 * 创建时间：2016年12月7日 下午6:57:43
 * @version 1.0.0
 */
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
    @Bean  
    public KeyGenerator wiselyKeyGenerator(){  
        return new KeyGenerator() {  
            @Override  
            public Object generate(Object target, Method method, Object... params) {  
                StringBuilder sb = new StringBuilder();  
                sb.append(target.getClass().getName());  
                sb.append(method.getName());  
                for (Object obj : params) {  
                    sb.append(obj.toString());  
                }  
                return sb.toString();  
            }  
        };  
  
    }  
  
    @Bean(name = "springCM")
    public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {  
        return new RedisCacheManager(redisTemplate);  
    }  
  
    @Bean  
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {  
        StringRedisTemplate template = new StringRedisTemplate(factory);  
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);  
        ObjectMapper om = new ObjectMapper();  
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);  
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);  
        jackson2JsonRedisSerializer.setObjectMapper(om);  
        template.setValueSerializer(jackson2JsonRedisSerializer);  
        template.afterPropertiesSet();  
        return template;  
    }  
}

/**
 * 项目名：onway
 * 包名：com.pactera.commons.redis
 * 文件名：RedisSessionDAO.java
 * 版本信息：1.0.0
 * 日期：2016年11月29日-下午3:11:50
 * Copyright (c) 2016 Pactera 版权所有
 */

package com.pactera.commons.redis;

import java.io.Serializable;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.shiro.session.Session;
import org.apache.shiro.session.UnknownSessionException;
import org.apache.shiro.session.mgt.eis.AbstractSessionDAO;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;

import com.pactera.commons.utils.SerializeUtils;

/**
 * 类名称：RedisSessionDAO 
 * 类描述： 
 * 创建人：heliang 
 * 创建时间：2016年11月29日 下午3:11:50
 * @version 1.0.0
 * @param <V>
 */

public class RedisSessionDAO<V> extends AbstractSessionDAO {
    private Logger logger = LogManager.getLogger(getClass());
    private RedisTemplate<byte[], V> redisTemplate;

    public RedisSessionDAO(RedisTemplate<byte[], V> redisTemplate) {
        super();
        this.redisTemplate =  redisTemplate;
    }

    @Value("${shiro.expired}")
    private Integer expired = 18000000;


    public Integer getExpired() {
        return expired;
    }


    public void setExpired(Integer expired) {
        this.expired = expired;
    }

    @Override
    public void update(Session session) throws UnknownSessionException {
        logger.debug("update Session:" + session.getId());
        this.saveSession(session);

    }

    @SuppressWarnings("unchecked")
    private void saveSession(Session session) {
        if (session == null || session.getId() == null) {
            logger.error("session or session id is null");
            return;
        }

        byte[] key = getByteKey(session.getId());
        session.setTimeout(expired);
        logger.debug("Save Session:" + session.getId());
        redisTemplate.opsForValue().set(key, (V) session);
    }

    private byte[] getByteKey(Serializable sessionId) {
        if (sessionId instanceof String) {
            String preKey = ShrioRedisCache.prefix + sessionId;
            return preKey.getBytes();
        } else {
            return SerializeUtils.serialize(sessionId);
        }
    }

    @Override
    public void delete(Session session) {
        if (session == null || session.getId() == null) {
            logger.error("session or session id is null");
            return;
        }
        logger.debug("delete Session:" + session.getId());
        redisTemplate.delete(getByteKey(session.getId()));
    }

    @Override
    public Collection<Session> getActiveSessions() {
        Set<Session> sessions = new HashSet<Session>();
        Set<byte[]> keys = redisTemplate.keys(getByteKey(ShrioRedisCache.prefix + "*"));
        if (keys != null && keys.size() > 0) {
            for (byte[] key : keys) {
                Session s = (Session) redisTemplate.opsForValue().get(key);
                sessions.add(s);
            }
        }

        return sessions;
    }

    @Override
    protected Serializable doCreate(Session session) {
        logger.debug("Session create :" + session.getId());
        Serializable sessionId = this.generateSessionId(session);
        this.assignSessionId(session, sessionId);
        this.saveSession(session);
        return sessionId;
    }

    @Override
    protected Session doReadSession(Serializable sessionId) {
        if (sessionId == null) {
            logger.error("session id is null");
            return null;
        }
        logger.debug("Session doReadSession :" + sessionId);
        byte[] key = getByteKey(sessionId);
        Session s = (Session) redisTemplate.opsForValue().get(key);
        return s;
    }

}

/**
 * 项目名：onway
 * 包名：com.pactera.commons.redis
 * 文件名：ShrioRedisCache.java
 * 版本信息：1.0.0
 * 日期：2016年11月28日-下午3:06:06
 * Copyright (c) 2016 Pactera 版权所有
 */

package com.pactera.commons.redis;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.apache.commons.collections.CollectionUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;

import com.google.common.collect.Sets;
import com.pactera.commons.utils.SerializeUtils;


public class ShrioRedisCache<K, V> implements Cache<K, V> {
    private Logger logger = LogManager.getLogger(getClass());
    private RedisTemplate<byte[], V> redisTemplate;
    public static String prefix = "shiro_redis:";

    public ShrioRedisCache(RedisTemplate<byte[], V> redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    public ShrioRedisCache(RedisTemplate<byte[], V> redisTemplate, String prefix) {
        this(redisTemplate);
        this.prefix = prefix;
    }

    @Override
    public V get(K key) throws CacheException {
        if (logger.isDebugEnabled()) {
            logger.debug("Key: {}", key);
        }
        if (key == null) {
            return null;
        }

        byte[] bkey = getByteKey(key);
        return redisTemplate.opsForValue().get(bkey);
    }

    @Override
    public V put(K key, V value) throws CacheException {
        if (logger.isDebugEnabled()) {
            logger.debug("Key: {}, value: {}", key, value);
        }

        if (key == null || value == null) {
            return null;
        }

        byte[] bkey = getByteKey(key);
        redisTemplate.opsForValue().set(bkey, value);
        return value;
    }

    @Override
    public V remove(K key) throws CacheException {
        if (logger.isDebugEnabled()) {
            logger.debug("Key: {}", key);
        }

        if (key == null) {
            return null;
        }

        byte[] bkey = getByteKey(key);
        ValueOperations<byte[], V> vo = redisTemplate.opsForValue();
        V value = vo.get(bkey);
        redisTemplate.delete(bkey);
        return value;
    }

    @Override
    public void clear() throws CacheException {
        redisTemplate.getConnectionFactory().getConnection().flushDb();
    }

    @Override
    public int size() {
        Long len = redisTemplate.getConnectionFactory().getConnection().dbSize();
        return len.intValue();
    }

    @SuppressWarnings("unchecked")
    @Override
    public Set<K> keys() {
        byte[] bkey = (prefix + "*").getBytes();
        Set<byte[]> set = redisTemplate.keys(bkey);
        Set<K> result = Sets.newHashSet();

        if (CollectionUtils.isEmpty(set)) {
            return Collections.emptySet();
        }

        for (byte[] key : set) {
            result.add((K) key);
        }
        return result;
    }

    @Override
    public Collection<V> values() {
        Set<K> keys = keys();
        List<V> values = new ArrayList<>(keys.size());
        for (K k : keys) {
            byte[] bkey = getByteKey(k);
            values.add(redisTemplate.opsForValue().get(bkey));
        }
        return values;
    }

    private byte[] getByteKey(K key) {
        if (key instanceof String) {
            String preKey = this.prefix + key;
            return preKey.getBytes();
        } else {
            return SerializeUtils.serialize(key);
        }
    }

    public String getPrefix() {
        return prefix;
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }
}

/**
 * 项目名：onway
 * 包名：com.pactera.commons.redis
 * 文件名：ShrioRedisCacheManager.java
 * 版本信息：1.0.0
 * 日期：2016年11月28日-下午3:15:04
 * Copyright (c) 2016 Pactera 版权所有
 */

package com.pactera.commons.redis;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.shiro.cache.AbstractCacheManager;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.springframework.data.redis.core.RedisTemplate;

/**
 * 类名称：ShrioRedisCacheManager 
 * 类描述： 
 * 创建人：heliang 
 * 创建时间：2016年11月28日 下午3:15:04
 * 
 * @version 1.0.0
 */
public class ShrioRedisCacheManager extends AbstractCacheManager {
    private Logger logger = LogManager.getLogger(getClass());
    private RedisTemplate<byte[], Object> redisTemplate;

    public ShrioRedisCacheManager(RedisTemplate<byte[], Object> redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    @Override
    protected Cache<byte[], Object> createCache(String name) throws CacheException {
        return new ShrioRedisCache<byte[], Object>(redisTemplate, name);
    }

}