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（需要翻墙）。

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

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

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:truerunoob value in cache - Free Education

add 操作实例

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
 Future 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

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

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
 Future 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

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
 Future 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

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

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

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

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
 Future 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

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());
 }}