Java使用memcached

Posted 2022-11-27 ycyk_168

1.加载commons-pool-1.5.6.jar、java_memcached-release_2.6.6.jar、slf4j-api-1.6.1.jar、slf4j-simple-1.6.1.jar

2.创建memcached工具类：

public class MemcachedUtil 

	/**
	 * memcached客户端单例
	 */
	private static MemCachedClient cachedClient = new MemCachedClient();
	
	/**
	 * 初始化连接池
	 */
	static 
		//获取连接池的实例
		SockIOPool pool = SockIOPool.getInstance();
		
		//服务器列表及其权重
		String[] servers = "127.0.0.1:11211";
		Integer[] weights = 3;
		
		//设置服务器信息
		pool.setServers(servers);
		pool.setWeights(weights);
		
		//设置初始连接数、最小连接数、最大连接数、最大处理时间
		pool.setInitConn(10);
		pool.setMinConn(10);
		pool.setMaxConn(1000);
		pool.setMaxIdle(1000*60*60);
		
		//设置连接池守护线程的睡眠时间
		pool.setMaintSleep(60);
		
		//设置TCP参数，连接超时
		pool.setNagle(false);
		pool.setSocketTO(60);
		pool.setSocketConnectTO(0);
		
		//初始化并启动连接池
		pool.initialize();
		
		//压缩设置，超过指定大小的都压缩
//		cachedClient.setCompressEnable(true);
//		cachedClient.setCompressThreshold(1024*1024);
	
	
	private MemcachedUtil()
	
	
	public static boolean add(String key, Object value) 
		return cachedClient.add(key, value);
	
	
	public static boolean add(String key, Object value, Integer expire) 
		return cachedClient.add(key, value, expire);
	
	
	public static boolean put(String key, Object value) 
		return cachedClient.set(key, value);
	
	
	public static boolean put(String key, Object value, Integer expire) 
		return cachedClient.set(key, value, expire);
	
	
	public static boolean replace(String key, Object value) 
		return cachedClient.replace(key, value);
	
	
	public static boolean replace(String key, Object value, Integer expire) 
		return cachedClient.replace(key, value, expire);
	
	
	public static Object get(String key) 
		return cachedClient.get(key);
	
	

3. 创建需要缓存的对象：

public class UserBean implements Serializable 

	private static final long serialVersionUID = 9174194101246733501L;

	private String username;
	
	private String password;
	
	public UserBean(String username, String password) 
		this.username = username;
		this.password = password;
	
	
	public String getUsername() 
		return username;
	
	
	public void setUsername(String username) 
		this.username = username;
	
	
	public String getPassword() 
		return password;
	
	
	public void setPassword(String password) 
		this.password = password;
	
	
	@Override
	public int hashCode() 
		final int prime = 31;
		int result = 1;
		result = prime * result
				+ ((password == null) ? 0 : password.hashCode());
		result = prime * result
				+ ((username == null) ? 0 : username.hashCode());
		return result;
	

	@Override
	public boolean equals(Object obj) 
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		UserBean other = (UserBean) obj;
		if (password == null) 
			if (other.password != null)
				return false;
		 else if (!password.equals(other.password))
			return false;
		if (username == null) 
			if (other.username != null)
				return false;
		 else if (!username.equals(other.username))
			return false;
		return true;
	

	@Override
	public String toString() 
		return "username:" + username + ",password:" + password;
	

4.创建测试用例：

public class MemcachedUtilTest 

	@Test
	public void testMemcached() 
		MemcachedUtil.put("hello", "world", 60);
		String hello = (String) MemcachedUtil.get("hello");
		Assert.assertEquals("world", hello);
		
		for(int i = 0; i < 10000000; ++i) 
			UserBean userBean = new UserBean("Jason" + i, "123456-" + i);
			MemcachedUtil.put("user" + i, userBean, 60);
			Object obj = MemcachedUtil.get("user" + i);
			Assert.assertEquals(userBean, obj);
		
	

5.通过spring注入memcached：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="memcachedPool" class="com.danga.MemCached.SockIOPool" 
		factory-method="getInstance" init-method="initialize">
		<constructor-arg>
			<value>neeaMemcachedPool</value>
		</constructor-arg>
		<property name="servers">
			<list>
				<value>127.0.0.1:11211</value>
			</list>
		</property>
		<property name="initConn">
			<value>20</value>
		</property>
		<property name="minConn">
			<value>10</value>
		</property>
		<property name="maxConn">
			<value>50</value>
		</property>
		<property name="nagle">
			<value>false</value>
		</property>
		<property name="socketTO">
			<value>3000</value>
		</property>
	</bean>
	<bean id="memcachedClient" class="com.danga.MemCached.MemCachedClient">
		<constructor-arg>
			<value>neeaMemcachedPool</value>
		</constructor-arg>
	</bean>
</beans>

6.创建测试用例：

 

public class MemcachedSpringTest 

	private MemCachedClient cachedClient;
	
	@Before
	public void init() 
		ApplicationContext context = new ClassPathXmlApplicationContext("com/loujinhe/config/beans.xml");
		cachedClient = (MemCachedClient)context.getBean("memcachedClient");
	
	
	@Test
	public void testMemcachedSpring() 
		UserBean user = new UserBean("lou", "jason");
		cachedClient.set("user", user);
		UserBean cachedBean = (UserBean)user;
		Assert.assertEquals(user, cachedBean);