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Java 连接 Memcached 服务详解数据库

• 数据库



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

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
(
)
)
;
}

}

}


原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/4280.html

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