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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()); } } }