場景再現：SpringDataRedis小demo

專案結構：

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.lucifer</groupId>
    <artifactId>springDataRedisDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
            <version>2.0.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.10.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.5</version>
        </dependency>

    </dependencies>

</project>
 

ps:

    pom.xml需要匯入slf4j-simple包。

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.5</version>
        </dependency>

否者可能會報錯：

redisConfig.properties： 

redis.host=127.0.0.1 
redis.port=6379 
redis.pass=
redis.database=0 
redis.maxIdle=300 
redis.maxWait=3000 
redis.testOnBorrow=true 

applicationContext-redis.xml： 

<?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:p="http://www.springframework.org/schema/p" 
  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">
  
   <context:property-placeholder location="classpath*:properties/*.properties" />   
  
   <!-- redis 相關配置 --> 
   <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">  
     <property name="maxIdle" value="${redis.maxIdle}" />   
     <property name="maxWaitMillis" value="${redis.maxWait}" />  
     <property name="testOnBorrow" value="true" />
   </bean>  
  
   <bean id="JedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" 
       p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}" p:pool-config-ref="poolConfig"/>  
   
   <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">  
    	<property name="connectionFactory" ref="JedisConnectionFactory" />  
   </bean>  
      
</beans>  
 

test測試類： 

package test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import redis.clients.jedis.Jedis;

/**
 * @author: Lucifer
 * @create: 2018-10-25 22:25
 * @description:
 **/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring/applicationContext-redis.xml")
public class TestValue {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    public void setValue() {
        redisTemplate.boundValueOps("name").set("lucifer");
    }

    @Test
    public void getValue() {
        Object name = redisTemplate.boundValueOps("name").get();
        System.out.println(name);
    }

    @Test
    public void deleteValue() {
        redisTemplate.delete("name");
    }

}

問題：

當我執行test測試類第一個方法setValue()時就會報錯，錯誤如下：

部分異常截圖：

org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool

org.springframework.data.redis.core.DefaultBoundValueOperations.set(DefaultBoundValueOperations.java:110)
	
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.UnknownHostException: 127.0.0.1 
	at redis.clients.jedis.Connection.connect(Connection.java:207)
	at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
	at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
	at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)

解決：

後來我看了下配置檔案，發現我的redis配置檔案：

而我的redis本地服務沒有啟動，啟動的是我的遠端虛擬機器的redis服務，所以這裡需要改成我的虛擬機器的ip地址。

當然遠端redis需要啟動服務。

參考：win10 遠端連線虛擬機器linux Centos7上的redis

再次執行test測試類的方法：