spring框架下redisTemplate的使用

青旅半醒 2022-05-29 10:53 208阅读 0赞

Spring的框架越来越好用；但是将来是springcloud的；

1. 配置redis本地安装后的信息,放在.properties中；如何读取这些配置文件，请自学

redis.host=127.0.0.1
    redis.port=4490
    redis.pass=yuanyirui
    redis.flag=false

2. 配置spring框架加载redis配置文件（可以理解为：spring集成redis）

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    	xmlns:mvc="http://www.springframework.org/schema/mvc"
    	xmlns:p="http://www.springframework.org/schema/websocket"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans 
    	   http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context 
           http://www.springframework.org/schema/context/spring-context.xsd  
           http://www.springframework.org/schema/mvc 
           http://www.springframework.org/schema/mvc/spring-mvc.xsd 
           http://www.springframework.org/schema/websocket 
           http://www.springframework.org/schema/websocket/spring-websocket.xsd">
     	
    	<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
    		<property name="maxIdle" value="300" />
    		<property name="maxActive" value="3000" />
    		<property name="maxWait" value="10000" />
    		<property name="testOnBorrow" value="true" />
    	</bean>
    
    	<bean id="connectionFactory"  class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
    		<property name="hostName" value="${redis.host}" />
    		<property name="port" value="${redis.port}" />
    		<property name="password" value="${redis.pass}" />
    		<property name="poolConfig" ref="poolConfig" />
    	</bean>
    
    	<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
    		<property name="connectionFactory" ref="connectionFactory" />
    	</bean>
    
    </beans>

3.编写java代码

import java.io.Serializable;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.serializer.RedisSerializer;
    
    public abstract class RedisTempl<K extends Serializable, V extends Serializable> {
    	@Autowired
    	protected RedisTemplate<K , V> redisTemplate;
    
    	public void setRedisTemplate(RedisTemplate<K , V> redisTemplate) {
    		this.redisTemplate = redisTemplate;
    	}
    
    	protected RedisSerializer<String> getRedisSerializer() {
    		return redisTemplate.getStringSerializer();
    	}
    
    }

4.写个增删查询的例子

4.1 接口：为什么要使用接口，这是一个面试考点

public interface IRedis {
        /**
         * 插入
         */
    	boolean put(final String keyId, final String entity);
    	/**
    	 * 删除
    	 */
    	void remove(final String keyId);
    	/**
    	 * 查询
    	 */
    	String get(final String keyId);
    	
    	Set<String> getKeys(final String pattern) ;
    	
    }

4.2 实现

@Service
    public class RedisImpl extends RedisTempl<String , String> implements IRedis{
    
    	@Override
    	public boolean put(final String keyId, final String entity) {
    		boolean result = redisTemplate.execute(new RedisCallback<Boolean>() {
    			public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
    				RedisSerializer<String> serializer = getRedisSerializer();
    				byte[] key = serializer.serialize(keyId) ;
    				byte[] value = serializer.serialize(entity) ;
    				return connection.setNX(key, value);
    			}
    		});
    		return result;
    	}
    
    	@Override
    	public void remove(String key) {
    		redisTemplate.delete(key) ;
    	}
    
    	@Override
    	public String get(final String keyId) {
    		String entity = redisTemplate.execute(new RedisCallback<String>() {  
    			public String doInRedis(RedisConnection connection) throws DataAccessException {  
    		        RedisSerializer<String> serializer = getRedisSerializer();  
    		        byte[] key = serializer.serialize(keyId);  
    		        byte[] value = connection.get(key);  
    		        if (value == null) {  
    		          return null;  
    		        }  
    		        return serializer.deserialize(value);  
    		      }  
    		    });  
    		return entity ;  
    	}
    
    	@Override
    	public Set<String> getKeys(String pattern) {
    		return redisTemplate.keys("*"+pattern+"*") ;
    	}
    
    }

4.3 依赖

<dependency>    
        <groupId>redis.clients</groupId>     
        <artifactId>jedis</artifactId>    
        <version>2.9.0</version>    
    </dependency>      
    <dependency>      
      <groupId>org.springframework.data</groupId>      
      <artifactId>spring-data-redis</artifactId>      
      <version>1.7.2.RELEASE</version>      
    </dependency>