Java EE project from 0 build (11): Integrate Redis in the project, for data storage or caching _redis

First, Redis installation

Already installed Redis can go directly to the next step, no can be installed first: Linux (CentOS 7) Redis installation

Second, pom dependency: Jedis is a redis Java version of the client implementation

		<dependency>
			<groupId>org.springframework.data</groupId>
			<artifactId> spring-data-redis</artifactid>
			<version>1.5.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactid>jedis</ artifactid>
			<version>2.6.1</version>
		</dependency>

Third, spring configuration

Create a new redis.properties in the Resources directory:

#redis setting
redis.hostname =192.168.240.131
redis.port=6379
redis.timeout=15000
redis.usepool =true
redis.password=buildmavenweb

#jedis setting
jedis.maxidle=6
jedis.minevictableidletimemillis=300000
jedis.numtestsperevictionrun=3
jedis.timebetweenevictionrunsmillis=60000

Create a Spring-redis.xml file again:

<?xml version= "1.0" encoding= "UTF-8"?> <beans "xmlns=" xmlns:
	Xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns:context= "Http://www.springframework.org/schema/context" Xmlns:mvc= "Http://www.springframework.org/schema/mvc" xsi:schemalocation= "Http://www.springframework.org/schema /MVC http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd 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 "default-lazy-init= true" > <context: Component-scan base-package= "Com.spring.demo.redis"/> <!--introduced Redis profile--> <context: Property-placeholder location= "Classpath:redis.properties"/> <!--connection Pool configuration--> <bean id= "Jedispoolconfig" cl ass= "Redis.clients.jedis.JedisPoolConfig" > <!--the maximum number of idle connections in the connection pool--> <property name= "Maxidle" vaLue= "${jedis.maxidle}" ></property> <!--the minimum time that a connection is idle, the idle connection may be removed when this value is reached. A negative value (-1) means no removal. --> <property name= "Minevictableidletimemillis" value= "${jedis.minevictableidletimemillis}" ></ Property> <!--the number of linked resources per detection for the free link detection thread. The default is 3--> <property name= "Numtestsperevictionrun" value= "${jedis.numtestsperevictionrun}" ></property > <!--"free link" detection thread, the period of detection, the number of milliseconds. A negative value indicates that the detect thread is not running. The default is-1. --> <property name= "Timebetweenevictionrunsmillis" value= "${jedis.timebetweenevictionrunsmillis}" ></ Property> </bean> <!--spring provides Redis connection factory--> <bean id= "Jedisconnectionfactory" class= Amework.data.redis.connection.jedis.JedisConnectionFactory "destroy-method=" Destroy > <!--connection pool configuration--> < Property Name= "Poolconfig" ref= "Jedispoolconfig" ></property> <!--Redis Service host--> <property name= "hos Tname "value=" ${redis.hostname} "></property> <!--Redis service port number--> <property NAMe= "Port" value= "${redis.port}" ></property> <!--even timeout setting--> <property name= "Timeout" value=. Timeout} "></property> <!--whether to use connection pooling--> <property name=" Usepool "value=" ${redis.usepool} "></ property> <!--redis Service connection password--> <property name= "password" value= "${redis.password}" ></property> & Lt;/bean> <!--spring provides access to Redis classes--> <bean id= "Redistemplate" Org.springframework.data.redis.core.RedisTemplate "> <!--redis connection factory--> <property name=" ConnectionFactory "ref=" jedisconnectionfactory "></property> <property name=" Keyserializer "> < Bean class= "Org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> <!-- Jdkserializationredisserializer supports serialization of all classes that implement serializable--> <property name= "ValueSerializer" > <bean class= "Org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/> </property&Gt
 </bean> </beans>

PS: The following section is taken from: http://shift-alt-ctrl.iteye.com/blog/1887370

Spring-data-redis offers a variety of serializer strategies that are very handy for developers who use Jedis. The SDR provides 4 built-in Serializer:jdkserializationredisserializer: A serialization tool using JDK (Serializable interface, Objectinputstrean, ObjectOutputStream), data stored in byte stream stringredisserializer: string encoding, data stored in string Jacksonjsonredisserializer:json format Oxmserializer:xml Format Storage

Among them, Jdkserializationredisserializer and Stringredisserializer are the most basic serialization strategies, in which "Jacksonjsonredisserializer" and " Oxmserializer "are all based on stirng storage, so they are more" advanced "serialization (eventually using string parsing and building Java objects).

In Redistemplate, you need to declare 4 serializer, default to "Jdkserializationredisserializer":

1) Keyserializer: For ordinary k-v operations, key to take the serialization strategy
2) The serialization strategy adopted by Valueserializer:value
3) Hashkeyserializer: In the hash data structure, the Hash-key serialization strategy
4) serialization strategy for Hashvalueserializer:hash-value

In any case, it is recommended that Key/hashkey adopt Stringredisserializer.
Four, web.xml if the configuration file is a unified format loaded, such as: Classpath:/spring-*.xml, you are not allowed to do special loading, or you need to load the spring-redis.xml alone in

	<!--load configuration file-->
	<!--contextconfiglocation The default value in the Contextloaderlistener class is/web-inf/ Applicationcontext.xml-->
	<context-param>
		<param-name>contextconfiglocation</ param-name>
		<param-value>
			classpath:/spring-*.xml
		</param-value>
	</ Context-param>

Five, use in Java code

Create a new Redisutils.class that specializes in handling Redis related actions:

Package Com.spring.demo.redis;

Import org.springframework.beans.factory.annotation.Autowired;
Import org.springframework.data.redis.core.RedisTemplate;
Import org.springframework.stereotype.Component;

/**
 * Created by Ehsy_it on 2016/8/7.
 * *
@Component public
class Redisutils {

    @Autowired
    private redistemplate<string,object> Redistemplate;

    /**
     * Gets the specified key value of value
     * @param key *
     /public Object gets
    (String key) {
        return Redistemplate.boundvalueops (Key). get ();

    /**
     * Saves the specified key value of value
     * @param key
     * @param value *
     /public
    void Set (String key, Object value) { C23/>redistemplate.boundvalueops (Key). Set (value);

    /**
     * Delete the value of the specified key
     * @param key/public
    void del (String key) {
        redistemplate.delete (key);
    }
}

VI. Testing a new Redismain.class class, we store a string and list type from the code and get it from:

Package Com.spring.demo.redis;

Import Org.springframework.context.ApplicationContext;
Import Org.springframework.context.support.ClassPathXmlApplicationContext;

Import java.util.ArrayList;
Import java.util.List;

/**
 * Created by Ehsy_it on 2016/8/7.
 */Public
class Redismain {public

    static void Main (string[] args) {
        ApplicationContext ctx = new Classpathxml ApplicationContext ("/spring-redis.xml");
        Redisutils redisutils = (redisutils) ctx.getbean ("Redisutils");
        Redisutils.set ("China", "porcelain");
        list<string> list = new arraylist<string> ();
        List.add ("a");
        List.add ("B");
        List.add ("C");
        Redisutils.set ("list", list);
        System.out.println ("china=" + redisutils.get ("the");
        System.out.println ("list[1]=" + ((list) redisutils.get ("List")). Get (1));
    }

Vii. exception handling integration encountered problems can be viewed here Resolved: Redis Exception Summary (continuous collection); or leave a message for us to discuss together.
Eight, recommended Redis study address: http://www.redis.net.cn/
=============================================================================================================== ======= in order to facilitate everyone to learn, the project will be open source on my GitHub: Project address: Https://github.com/gubaijin/buildmavenweb
How to GitHub the project Open source channel, see my other blog post: GitHub Create project and initialize local project submit to GitHub