Spring下redis的配置

Posted 2020-10-06 程序猿001

这个项目用到redis，所以学了一下怎样在Spring框架下配置redis。

1、首先是在web.xml中添加Spring的配置文件。

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <display-name>common design</display-name>
    
    <context-param>  
        <param-name>webAppRootKey</param-name>  
        <param-value>webapp.root</param-value>  
    </context-param> 
    
    <!-- 添加Spring mybatis的配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml,classpath*:mybatis-config.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
  </servlet>

  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
     <url-pattern>/*</url-pattern>
  </servlet-mapping>

</web-app>

2、然后是redis的配置文件（redis-config.xml）文件。

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
     http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd"
    default-autowire="byName" default-lazy-init="true">

    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}" />
        <property name="maxWaitMillis" value="${redis.maxWait}" />
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />
    </bean>
    <!-- redis服务器中心 -->
    <bean id="connectionFactory"
        class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="poolConfig" ref="poolConfig" />
        <property name="port" value="${redis.port}" />
        <property name="hostName" value="${redis.host}" />
        <property name="password" value="${redis.password}" />
        <property name="timeout" value="${redis.timeout}"></property>
    </bean>
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="connectionFactory" />
        <property name="keySerializer">
            <bean
                class="org.springframework.data.redis.serializer.StringRedisSerializer" />
        </property>
        <property name="valueSerializer">
            <bean
                class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer" />
        </property>
    </bean>

    <bean id="redisUtil" class="com.zkxl.fep.redis.RedisUtil">
        <property name="redisTemplate" ref="redisTemplate" />
    </bean>

</beans>

在Spring的配置文件中引用redis的配置文件

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
     http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd"
    default-autowire="byName" default-lazy-init="true">

    <context:annotation-config/> 
    <context:component-scan base-package="com.test.fep" />
    
    <!-- 增加redis的properties文件 -->
    <context:property-placeholder location="classpath*:jdbc.properties,classpath*:redis.properties" />
    
    <import resource="datasource.xml"/>
    <!-- 导入redis的配置文件 -->
    <import resource="redis-config.xml"/>
    
</beans>

3、新建redis.properties，里面包含redis连接需要的配置信息

#redis setting  
redis.host=127.0.0.1
redis.port=6379
redis.password=123456
redis.maxIdle=100
redis.maxActive=300
redis.maxWait=1000
redis.testOnBorrow=true
redis.timeout=100000

fep.local.cache.capacity =10000

一定要注意，每行后面千万不要有空格，我就是因为这个问题卡了一两个小时= =

4、编写RedisUtil.java，里面放有redis的增删改查操作。

package com.test.fep.redis;

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

import org.springframework.data.redis.core.RedisTemplate;  
import org.springframework.data.redis.core.ValueOperations;  

public class RedisUtil {

    private RedisTemplate<Serializable, Object> 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) {
            logger.error("set cache error", e);
        }
        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) {
            logger.error("set cache error", e);
        }
        return result;
    }
    
    public long increment(final String key , long delta){
         return redisTemplate.opsForValue().increment(key, delta);
    }

    public void setRedisTemplate(RedisTemplate<Serializable, Object> redisTemplate) {
        this.redisTemplate = redisTemplate;
    }
}

5、在功能代码中调用RedisUtil类中的方法，

package com.test.fep.service.impl;

import java.math.BigDecimal;
import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import com.test.fep.domain.SysAppLoginToken;
import com.test.fep.mapper.SysAppLoginTokenMapper;
import com.test.fep.redis.RedisUtil;
import com.test.fep.service.AuthService;

import net.sf.json.JSONObject;

@Service("authService")
public class AuthServiceImpl implements AuthService{
    @Autowired
    private SysAppLoginTokenMapper sysAppLoginTokenMapper ;

    @Autowired
    private RedisUtil redisUtil;  //记得注入
    
    @Override
    public SysAppLoginToken verification(String tokenId) {
        SysAppLoginToken token = null;
        if (redisUtil.exists(tokenId)) {
            token = (SysAppLoginToken) redisUtil.get(tokenId);  //从缓存中查找token
        }else{
            token = sysAppLoginTokenMapper.selectByPrimaryKey(tokenId) ;
            redisUtil.set(tokenId, token);    //将token写入缓存 
        }
        
        return null;
    }
}

好了，到这里就在一个项目中完整地使用了redis。

还需要注意的一点是，所有保存在Redis中的接口都必须要实现Serializable接口