Java 连接 Memcached 服务

使用 Java 程序连接 Memcached，需要在你的 classpath 中添加 Memcached jar 包。

本站 jar 包下载地址：spymemcached-2.10.3.jar。

Google Code jar 包下载地址：spymemcached-2.10.3.jar（需要科学上网）。

以下程序假定 Memcached 服务的主机为 127.0.0.1，端口为 11211。

连接实例

Java 连接 Memcached

MemcachedJava.java 文件：

import net.spy.memcached.MemcachedClient;

import java.net.*;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 本地连接 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 关闭连接

mcc.shutdown();

}catch(Exception ex){

System.out.println( ex.getMessage() );

}

}

}

该程序中我们使用 InetSocketAddress 连接 IP 为 127.0.0.1 端口 为 11211 的 memcached 服务。

执行以上代码，如果连接成功会输出以下信息：

Connection to server successful.

set 操作实例

以下使用 java.util.concurrent.Future 来存储数据

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 存储数据

Future fo = mcc.set("runoob", 900, "Free Education");

// 查看存储状态

System.out.println("set status:" + fo.get());

// 输出值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex){

System.out.println( ex.getMessage() );

}

}

}

执行程序，输出结果为：

Connection to server successful.
set status:true
runoob value in cache - Free Education

add 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "Free Education");

// 打印状态

System.out.println("set status:" + fo.get());

// 输出

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 添加

fo = mcc.add("runoob", 900, "memcached");

// 打印状态

System.out.println("add status:" + fo.get());

// 添加新key

fo = mcc.add("codingground", 900, "All Free Compilers");

// 打印状态

System.out.println("add status:" + fo.get());

// 输出

System.out.println("codingground value in cache - " + mcc.get("codingground"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex){

System.out.println(ex.getMessage());

}

}

}

replace 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try {

//连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加第一个 key=》value 对

Future fo = mcc.set("runoob", 900, "Free Education");

// 输出执行 add 方法后的状态

System.out.println("add status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 添加新的 key

fo = mcc.replace("runoob", 900, "Largest Tutorials' Library");

// 输出执行 set 方法后的状态

System.out.println("replace status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex){

System.out.println( ex.getMessage() );

}

}

}

append 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "Free Education");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 对存在的key进行数据添加操作

fo = mcc.append("runoob", 900, " for All");

// 输出执行 set 方法后的状态

System.out.println("append status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("codingground"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

]

}

}

prepend 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "Education for All");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 对存在的key进行数据添加操作

fo = mcc.prepend("runoob", 900, "Free ");

// 输出执行 set 方法后的状态

System.out.println("prepend status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("codingground"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

}

}

}

CAS 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.CASValue;

import net.spy.memcached.CASResponse;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "Free Education");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 使用 get 方法获取数据

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 通过 gets 方法获取 CAS token（令牌）

CASValue casValue = mcc.gets("runoob");

// 输出 CAS token（令牌） 值

System.out.println("CAS token - " + casValue);

// 尝试使用cas方法来更新数据

CASResponse casresp = mcc.cas("runoob", casValue.getCas(), 900, "Largest Tutorials-Library");

// 输出 CAS 响应信息

System.out.println("CAS Response - " + casresp);

// 输出值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

}

}

}

get 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "Free Education");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 使用 get 方法获取数据

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

}

}

}

gets 操作实例、CAS

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.CASValue;

import net.spy.memcached.CASResponse;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "Free Education");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 从缓存中获取键为 runoob 的值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 通过 gets 方法获取 CAS token（令牌）

CASValue casValue = mcc.gets("runoob");

// 输出 CAS token（令牌） 值

System.out.println("CAS value in cache - " + casValue);

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

}

}

}

delete 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数据

Future fo = mcc.set("runoob", 900, "World's largest online tutorials library");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("runoob"));

// 对存在的key进行数据添加操作

fo = mcc.delete("runoob");

// 输出执行 delete 方法后的状态

System.out.println("delete status:" + fo.get());

// 获取键对应的值

System.out.println("runoob value in cache - " + mcc.get("codingground"));

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

}

}

}

Incr/Decr 操作实例

MemcachedJava.java 文件：

import java.net.InetSocketAddress;

import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {

public static void main(String[] args) {

try{

// 连接本地的 Memcached 服务

MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

System.out.println("Connection to server sucessful.");

// 添加数字值

Future fo = mcc.set("number", 900, "1000");

// 输出执行 set 方法后的状态

System.out.println("set status:" + fo.get());

// 获取键对应的值

System.out.println("value in cache - " + mcc.get("number"));

// 自增并输出

System.out.println("value in cache after increment - " + mcc.incr("number", 111));

// 自减并输出

System.out.println("value in cache after decrement - " + mcc.decr("number", 112));

// 关闭连接

mcc.shutdown();

}catch(Exception ex) {

System.out.println(ex.getMessage());

}

}

}