# Java 連接 Memcached 服務
使用 Java 程序連接 Memcached，需要在你的 classpath 中添加 Memcached jar 包。
本站 jar 包下載地址：[spymemcached-2.10.3.jar](/try/download/spymemcached-2.10.3.jar)。Google Code jar 包下載地址：[spymemcached-2.10.3.jar](http://code.google.com/p/spymemcached/downloads/list)（需要翻墻）。
以下程序假定 Memcached 服務的主機為 127.0.0.1，端口為 11211。
### 連接實例
Java 連接 Memcached
```
import net.spy.memcached.MemcachedClient;
import java.net.*;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 本地連接 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 關閉連接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
}
```
該程序中我們使用 InetSocketAddress 連接 IP 為 127.0.0.1 端口 為 11211 的 memcached 服務。
執行以上代碼，如果連接成功會輸出以下信息：
```
Connection to server successful.
```
### set 操作實例
以下使用 java.util.concurrent.Future 來存儲數據
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 存儲數據
Future fo = mcc.set("runoob", 900, "Free Education");
// 查看存儲狀態
System.out.println("set status:" + fo.get());
// 輸出值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
}
```
執行程序，輸出結果為：
```
Connection to server successful.
set status:true
runoob value in cache - Free Education
```
### add 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "Free Education");
// 打印狀態
System.out.println("set status:" + fo.get());
// 輸出
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 添加
Future fo = mcc.add("runoob", 900, "memcached");
// 打印狀態
System.out.println("add status:" + fo.get());
// 添加新key
fo = mcc.add("codingground", 900, "All Free Compilers");
// 打印狀態
System.out.println("add status:" + fo.get());
// 輸出
System.out.println("codingground value in cache - " + mcc.get("codingground"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex){
System.out.println(ex.getMessage());
}
}
}
```
### replace 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try {
//連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加第一個 key=》value 對
Future fo = mcc.set("runoob", 900, "Free Education");
// 輸出執行 add 方法后的狀態
System.out.println("add status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 添加新的 key
fo = mcc.replace("runoob", 900, "Largest Tutorials' Library");
// 輸出執行 set 方法后的狀態
System.out.println("replace status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
}
```
### append 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "Free Education");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 對存在的key進行數據添加操作
Future fo = mcc.append("runoob", 900, " for All");
// 輸出執行 set 方法后的狀態
System.out.println("append status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("codingground"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
### prepend 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "Education for All");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 對存在的key進行數據添加操作
Future fo = mcc.prepend("runoob", 900, "Free ");
// 輸出執行 set 方法后的狀態
System.out.println("prepend status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("codingground"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
### CAS 操作實例
```
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{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "Free Education");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 使用 get 方法獲取數據
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 通過 gets 方法獲取 CAS token（令牌）
CASValue casValue = mcc.gets("runoob");
// 輸出 CAS token（令牌） 值
System.out.println("CAS token - " + casValue);
// 嘗試使用cas方法來更新數據
CASResponse casresp = mcc.cas("runoob", casValue.getCas(), 900, "Largest Tutorials-Library");
// 輸出 CAS 響應信息
System.out.println("CAS Response - " + casresp);
// 輸出值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
### get 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "Free Education");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 使用 get 方法獲取數據
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
### gets 操作實例、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{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "Free Education");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 從緩存中獲取鍵為 runoob 的值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 通過 gets 方法獲取 CAS token（令牌）
CASValue casValue = mcc.gets("runoob");
// 輸出 CAS token（令牌） 值
System.out.println("CAS value in cache - " + casValue);
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
### delete 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數據
Future fo = mcc.set("runoob", 900, "World's largest online tutorials library");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("runoob"));
// 對存在的key進行數據添加操作
Future fo = mcc.delete("runoob");
// 輸出執行 delete 方法后的狀態
System.out.println("delete status:" + fo.get());
// 獲取鍵對應的值
System.out.println("runoob value in cache - " + mcc.get("codingground"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
### Incr/Decr 操作實例
```
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// 連接本地的 Memcached 服務
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// 添加數字值
Future fo = mcc.set("number", 900, "1000");
// 輸出執行 set 方法后的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("value in cache - " + mcc.get("number"));
// 自增并輸出
System.out.println("value in cache after increment - " + mcc.incr("number", 111));
// 自減并輸出
System.out.println("value in cache after decrement - " + mcc.decr("number", 112));
// 關閉連接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
```
- Memcached 入門
- Memcached 簡介
- Memcached 安裝
- Memcached 連接
- Memcached 存儲命令
- Memcached set 命令
- Memcached add 命令
- Memcached replace 命令
- Memcached append 命令
- Memcached prepend 命令
- Memcached CAS 命令
- Memcached 查找命令
- Memcached get 命令
- Memcached gets 命令
- Memcached delete 命令
- Memcached incr 與 decr 命令
- Memcached 統計命令
- Memcached stats 命令
- Memcached stats items 命令
- Memcached stats slabs 命令
- Memcached stats sizes 命令
- Memcached flush_all 命令
- Memcached 實例
- Java 連接 Memcached 服務
- PHP 連接 Memcached 服務