java使用memcached1--安装与基本使用

 

环境

　　CentOs6.4 libevent-2.0.22-stable memcached-1.4.24

一、memcached安装

　　# cd /usr/local

　　1、编译安装libevent

# wget http://nchc.dl.sourceforge.net/project/levent/libevent/libevent-2.0/libevent-2.0.22-stable.tar.gz
# tar -xzvf libevent-2.0.22-stable.tar.gz
# cd libevent-2.0.22-stable
# ./configure --prefix=/usr
# make && make install

　　2、编译安装memcached

# wget http://memcached.org/latest
# tar -xzvf memcached-1.4.24.tar.gz
# cd memcached-1.4.24
# mkdir /usr/local/memcached
# ./configure --prefix=/usr/local/memcached --with-libevent=/usr
# make && make install

　　3、启动Memcached

/usr/local/memcached/bin/memcached  -u root -d -m 2048 -l 127.0.0.1 -p 11211 -P /tmp/memcached.pid

　　4、telnet登录

# telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
set foo 0 900 5
isfoo
STORED
get foo
VALUE foo 0 5
isfoo
END
quit
Connection closed by foreign host.

 

Memcached启动参数说明：

-p 监听tcp协议的监听端口
-T 监听UDP协议id监听端口默认都是11211 
-s 如果只在本地通信那么可以将其监听在某个套接字上，比如mysql.scok 能够利用共享内存方式进行通信的
-c 最大并发连接数
-l 监听的地址，如果服务器有多块网卡，那么用-l来指定监听的某个网卡上
-d 以一个服务方式运行
-r 设定最大内核大小限制
-u 以某个用户身份运行
-m  以兆为单位指定memcached最大内存可用空间
-t 用于处理入站请求最大的线程数，仅在memcached编译时开启了支持线程才有效，而linux对线程支持是非常有限的，所以不用关心了
-f 设定slab定义预先分配内存空间大小固定的块时使用的增长因子
-n 最小的存储单位是多大，默认是48字节，单位是字节
-P 指定pid文件
-L 视图使用最多的内存空间
-S 启用SSL认证功能

 

 

二、java使用memcached

package memcached;

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.CASResponse;
import net.spy.memcached.CASValue;
import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
    public static void main(String[] args) {
        MemcachedJava memcached = new MemcachedJava();
//        memcached.set();
//        memcached.add();
//        memcached.replace();
//        memcached.prepend();
//        memcached.cas();
//        memcached.get();
//        memcached.gets();
//        memcached.delete();
        memcached.incr();
    }
    
    private void set() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }

    @SuppressWarnings("rawtypes")
    private void add() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }

    @SuppressWarnings("rawtypes")
    private void replace() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }

    @SuppressWarnings("rawtypes")
    private void append() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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", " 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());
        }
    }

    private void prepend() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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", "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("runoob"));
            // 关闭连接
            mcc.shutdown();
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    private void cas() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }

    private void get() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }

    private void gets() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }

    private void delete() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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("runoob"));
            // 关闭连接
            mcc.shutdown();
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    private void incr() {
        try {
            // 连接本地的 Memcached 服务
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("192.168.77.135", 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());
        }
    }
}