java实现redis数据库访问

<strong>redis是一个数据库，一个在内存中的非关系型数据库，那为啥要用它,他是key-value形式存储的 value有很多形式 string set list hash 等，jedis提供了java访问redis数据库的方法，不知道为啥csdn资源下载中redis那个demo还要10分，怎么好意思要10分呢，还要8分，怎么好意思要8分呢，分享是美德。</strong>

<strong>我先写下来，还没测试呢，不知道这么写会不会效率很低，因为每次调用方法都重新获取jedis对象，用完了释放掉，希望大家给出好的建议</strong>

package ***.**.**.**;import java.util.ResourceBundle;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;

/*** @类描述 redis 工具* @功能名 POJO* @author zxf* @date 2014年11月25日*/public final class RedisUtil {private static JedisPool jedisPool = null;/*** 初始化Redis连接池*/static {try {//加载redis配置文件ResourceBundle bundle = ResourceBundle.getBundle("redis");if (bundle == null) {throw new IllegalArgumentException("[redis.properties] is not found!");}int maxActivity = Integer.valueOf(bundle.getString("redis.pool.maxActive"));int maxIdle = Integer.valueOf(bundle.getString("redis.pool.maxIdle"));long maxWait = Long.valueOf(bundle.getString("redis.pool.maxWait"));boolean testOnBorrow = Boolean.valueOf(bundle.getString("redis.pool.testOnBorrow"));boolean onreturn = Boolean.valueOf(bundle.getString("redis.pool.testOnReturn"));//创建jedis池配置实例JedisPoolConfig config = new JedisPoolConfig();//设置池配置项值config.setMaxActive(maxActivity);config.setMaxIdle(maxIdle);config.setMaxWait(maxWait);config.setTestOnBorrow(testOnBorrow);config.setTestOnReturn(onreturn);jedisPool = new JedisPool(config, bundle.getString("redis.ip"), Integer.valueOf(bundle.getString("redis.port")));} catch (Exception e) {e.printStackTrace();}}/*** 获取Jedis实例* @return*/public synchronized static Jedis getJedis() {try {if (jedisPool != null) {Jedis resource = jedisPool.getResource();return resource;} else {return null;}} catch (Exception e) {e.printStackTrace();return null;}}/*** 释放jedis资源* @param jedis*/public static void returnResource(final Jedis jedis) {if (jedis != null) {jedisPool.returnResource(jedis);}}/*** 查询数据*/public String  find(String key,String value){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.get(key);} catch (Exception e) {e.printStackTrace();return null;}finally{jedisPool.returnResource(jedis);}}/*** 查询特定字符串*/public String findSubStr(String key,Integer startOffset,Integer endOffset){Jedis jedis = null;try {jedis = jedisPool.getResource();return jedis.getrange(key, startOffset, endOffset);} catch (Exception e) {e.printStackTrace();return null;}finally{jedisPool.returnResource(jedis);}}/*** 向缓存中设置字符串内容 新增数据|修改* @param key key* @param value value* @return* @throws Exception*/public static int add(String key,String value) throws Exception{Jedis jedis = null;try {jedis = jedisPool.getResource();jedis.set(key, value);return 0;} catch (Exception e) {e.printStackTrace();return -1;}finally{jedisPool.returnResource(jedis);}}/*** 删除缓存中得对象，根据key* @param key* @return*/public static int del(String key){Jedis jedis = null;try {jedis = jedisPool.getResource();jedis.del(key);return 0;} catch (Exception e) {e.printStackTrace();return -1;}finally{jedisPool.returnResource(jedis);}}}

用到的jar包

<img src="http://img.blog.csdn.net/20141127094609062?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZGl2ZXJzaXR5MQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="" />