源码Gitub地址：https://github.com/heibaiying/spring-samples-for-all

一、说明

1.1 XMemcached客户端说明

XMemcached是基于java nio的memcached高性能客户端，支持完整的memcached协议，支持客户端分布并且提供了一致性哈希(consistent hash)算法的实现。

1.2 项目结构说明

1. memcached的整合配置位于com.heibaiying.config文件夹下。

1.3 依赖说明

除了spring的基本依赖外，需要导入xmemcached依赖包

 <!--memcached java 客户端-->
<dependency>
    <groupId>com.googlecode.xmemcached</groupId>
    <artifactId>xmemcached</artifactId>
    <version>2.4.5</version>
</dependency>

二、spring 整合 memcached

2.1 单机配置

@Bean
public MemcachedClient memcachedClient() {
    XMemcachedClientBuilder builder = new XMemcachedClientBuilder("192.168.200.201:11211");
    MemcachedClient memcachedClient = null;
try {
	memcachedClient = builder.build();
	} catch (IOException e) {
	e.printStackTrace();
}
	return memcachedClient;
}

2.2 集群配置

@Bean
public MemcachedClient memcachedClientForCluster() {

    List<InetSocketAddress> addressList = new ArrayList<InetSocketAddress>();
    addressList.add(new InetSocketAddress("192.168.200.201", 11211));
    addressList.add(new InetSocketAddress("192.168.200.201", 11212));
    // 赋予权重
    int[] weights = {1, 2};
    XMemcachedClientBuilder builder = new XMemcachedClientBuilder(addressList, weights);
    // 设置连接池大小
    builder.setConnectionPoolSize(10);
    // 协议工厂
    builder.setCommandFactory(new TextCommandFactory());
    // 分布策略，一致性哈希KetamaMemcachedSessionLocator或者ArraySessionLocator(默认)
    builder.setSessionLocator(new KetamaMemcachedSessionLocator());
    // 设置序列化器
    builder.setTranscoder(new SerializingTranscoder());
    MemcachedClient memcachedClient = null;
    try {
        memcachedClient = builder.build();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return memcachedClient;
}

2.3 存储基本类型测试用例

xmemcached单机版本和集群版本注入的实例是相同的；

/**
 * @author : heibaiying
 * @description : Memcached 操作基本对象
 */
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = {MemcacheConfig.class})
public class MemSamples {

    @Autowired
    private MemcachedClient memcachedClient;

    @Test
    public void operate() throws InterruptedException, MemcachedException, TimeoutException {
        memcachedClient.set("hello", 0, "Hello,cluster xmemcached");
        String value = memcachedClient.get("hello");
        System.out.println("hello=" + value);
        memcachedClient.delete("hello");
        value = memcachedClient.get("hello");
        System.out.println("hello=" + value);
    }
}

2.5 存储实体对象测试用例

/**
 * @author : heibaiying
 * @description :Memcached 序列化与反序列化
 */
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = {MemcacheConfig.class})
public class MemObjectSamples {

    @Autowired
    private MemcachedClient memcachedClient;

    @Test
    public void operate() throws InterruptedException, MemcachedException, TimeoutException {
        memcachedClient.set("programmer", 0, new Programmer("xiaoming", 12, 5000.21f, new Date()));
        Programmer programmer = memcachedClient.get("programmer");
        System.out.println("hello ," + programmer.getName());
        memcachedClient.delete("programmer");
        programmer = memcachedClient.get("programmer");
        Assert.assertNull(programmer);
    }
}

附：memcached 基本命令

命令	格式	说明
新增 set	set key flags exTime length -> value	无论什么情况，都可以插入
新增 add	add key flags exTime length -> value	只有当key不存在的情况下，才可以插入
替换 replace	replace key flags exTime length -> value	只修改已存在key的value值
追加内容append	append key flags exTime length -> value	length表示追加的长度而不是总长度
前面追加prepend	prepend key flags exTime length -> value	length表示追加的长度而不是总长度
查询操作 get	get key
检查更新 cas	cas key flags exTime length version -> value	版本正确才更新
详细获取 gets	gets key	返回的最后一个数代表 key 的 CAS 令牌
删除 delete	delete key	将数据打一个删除标记
自增 incr	incr key 增加偏移量	incr和decr只能操作能转换为数字的Value
自减 decr	decr key 减少偏移量	desr不能将数字减少至0以下
清库	flush_all

附：源码Gitub地址：https://github.com/heibaiying/spring-samples-for-all