spring 整合redis集群中使用@autowire无效问题的解决办法

1、视频参考黑马32期宜立方商城第6课

redis对于的代码

我们先变向一个redis客户端的接口文件

package com.test;
public interface JedisClient {

    String set(String key, String value);
    String get(String key);
    Boolean exists(String key);
    Long expire(String key, int seconds);
    Long ttl(String key);
    Long incr(String key);
    Long hset(String key, String field, String value);
    String hget(String key, String field);
    Long hdel(String key, String... field);
}

单机版:

package com.test;


import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

public class JedisClientPool implements JedisClient {
    

    public JedisPool getJedisPool() {
        return jedisPool;
    }

    public void setJedisPool(JedisPool jedisPool) {
        this.jedisPool = jedisPool;
    }

    private JedisPool jedisPool;

    @Override
    public String set(String key, String value) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.set(key, value);
        jedis.close();
        return result;
    }

    @Override
    public String get(String key) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.get(key);
        jedis.close();
        return result;
    }

    @Override
    public Boolean exists(String key) {
        Jedis jedis = jedisPool.getResource();
        Boolean result = jedis.exists(key);
        jedis.close();
        return result;
    }

    @Override
    public Long expire(String key, int seconds) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.expire(key, seconds);
        jedis.close();
        return result;
    }

    @Override
    public Long ttl(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.ttl(key);
        jedis.close();
        return result;
    }

    @Override
    public Long incr(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.incr(key);
        jedis.close();
        return result;
    }

    @Override
    public Long hset(String key, String field, String value) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hset(key, field, value);
        jedis.close();
        return result;
    }

    @Override
    public String hget(String key, String field) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.hget(key, field);
        jedis.close();
        return result;
    }

    @Override
    public Long hdel(String key, String... field) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hdel(key, field);
        jedis.close();
        return result;
    }

}

集群版:

package com.test;



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

import redis.clients.jedis.JedisCluster;

public class JedisClientCluster implements JedisClient {
    

    
    @Autowired
    private JedisCluster jedisCluster;

    @Override
    public String set(String key, String value) {
        return jedisCluster.set(key, value);
    }

    @Override
    public String get(String key) {
        return jedisCluster.get(key);
    }

    @Override
    public Boolean exists(String key) {
        return jedisCluster.exists(key);
    }

    @Override
    public Long expire(String key, int seconds) {
        return jedisCluster.expire(key, seconds);
    }

    @Override
    public Long ttl(String key) {
        return jedisCluster.ttl(key);
    }

    @Override
    public Long incr(String key) {
        return jedisCluster.incr(key);
    }

    @Override
    public Long hset(String key, String field, String value) {
        return jedisCluster.hset(key, field, value);
    }

    @Override
    public String hget(String key, String field) {
        return jedisCluster.hget(key, field);
    }

    @Override
    public Long hdel(String key, String... field) {
        return jedisCluster.hdel(key, field);
    }
    

}

我们编写一个applicationContext-redis.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
    http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
    http://www.springfamework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">

   <bean class="com.test.JedisClientCluster"></bean>
    
    
    <bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
     <constructor-arg>
         <set>
           <bean class="redis.clients.jedis.HostAndPort">
              <constructor-arg name="host" value="192.168.25.111"></constructor-arg>
              <constructor-arg name="port" value="7001"></constructor-arg>
           </bean>
           
             <bean class="redis.clients.jedis.HostAndPort">
              <constructor-arg name="host" value="192.168.25.111"></constructor-arg>
              <constructor-arg name="port" value="7002"></constructor-arg>
           </bean>
             <bean class="redis.clients.jedis.HostAndPort">
              <constructor-arg name="host" value="192.168.25.111"></constructor-arg>
              <constructor-arg name="port" value="7003"></constructor-arg>
           </bean>
             <bean class="redis.clients.jedis.HostAndPort">
              <constructor-arg name="host" value="192.168.25.111"></constructor-arg>
              <constructor-arg name="port" value="7004"></constructor-arg>
           </bean>
             <bean class="redis.clients.jedis.HostAndPort">
              <constructor-arg name="host" value="192.168.25.111"></constructor-arg>
              <constructor-arg name="port" value="7005"></constructor-arg>
           </bean>
             <bean class="redis.clients.jedis.HostAndPort">
              <constructor-arg name="host" value="192.168.25.111"></constructor-arg>
              <constructor-arg name="port" value="7006"></constructor-arg>
           </bean>
         
         </set>
     </constructor-arg>
    </bean>
</beans>

 

我们编写一个测试代码来进行测试

package com.e3mall.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.test.JedisClientCluster;

public class TestRedis {

    @Test
    public void testRedis(){
     ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-redis.xml");
     JedisClientCluster clientCluster =applicationContext.getBean(JedisClientCluster.class);
     clientCluster.hset("jjj", "sdjj", "111");
     String hget = clientCluster.hget("jjj", "sdjj");
     System.out.println(hget);
    }
}

 

运行的时候出现下面的情况

出现了jedisCluster这个对象为null,

说明

    @Autowired
    private JedisCluster jedisCluster;
这个注入没有起到效果
为啥出现这个情况了
https://blog.csdn.net/bluetjs/article/details/45368769

在基于主机方式配置Spring的配置文件中,你可能会见到<context:annotation-config/>这样一条配置,他的作用是式地向 Spring 容器注册

AutowiredAnnotationBeanPostProcessor、CommonAnnotationBeanPostProcessor、

PersistenceAnnotationBeanPostProcessor 以及 RequiredAnnotationBeanPostProcessor 这 4 个BeanPostProcessor。

注册这4个 BeanPostProcessor的作用,就是为了你的系统能够识别相应的注解。

例如:

如果你想使用@Autowired注解,那么就必须事先在 Spring 容器中声明 AutowiredAnnotationBeanPostProcessor Bean。传统声明方式如下:


  1. <bean class="org.springframework.beans.factory.annotation. AutowiredAnnotationBeanPostProcessor "/> 

如果想使用@ Resource 、@ PostConstruct、@ PreDestroy等注解就必须声明CommonAnnotationBeanPostProcessor

如果想使用@PersistenceContext注解,就必须声明PersistenceAnnotationBeanPostProcessor的Bean。

如果想使用 @Required的注解,就必须声明RequiredAnnotationBeanPostProcessor的Bean。同样,传统的声明方式如下:


  1. <bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor"/> 

一般来说,这些注解我们还是比较常用,尤其是Antowired的注解,在自动注入的时候更是经常使用,所以如果总是需要按照传统的方式一条一条配置显得有些繁琐和没有必要,于是spring给我们提供<context:annotation-config/>的简化配置方式,自动帮你完成声明。

   不过,呵呵,我们使用注解一般都会配置扫描包路径选项


  1. <context:component-scan base-package=”XX.XX”/> 

    该配置项其实也包含了自动注入上述processor的功能,因此当使用 <context:component-scan/> 后,就可以将 <context:annotation-config/> 移除了。

本文出自 “苦逼coder” 博客,请务必保留此出处http://mushiqianmeng.blog.51cto.com/3970029/723880

为了解决上面的问题:

我们需要在xml文件中配置:

方法一:<context:annotation-config/>

方法2:添加包扫描:

  1. <context:component-scan base-package=”XX.XX”/> 

posted on 2018-06-12 14:31  luzhouxiaoshuai  阅读(410)  评论(0编辑  收藏  举报

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