Java 連接 Memcached 服務
使用 Java 程式連接 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。
Google Code jar 包下載地址：spymemcached-2.10.3.jar（需要科學上網）。
以下程式假定 Memcached 服務的主機為 127.0.0.1，端口為 11211。
連接實例
Java 連接 Memcached
MemcachedJava.java 檔：
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() );
}
}
}
該程式中我們使用 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資訊：
Connection to server successful.
set 操作實例
以下使用 java.util.concurrent.Future 來存儲數據
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 查看存儲狀態
System.out.println("set status:" + fo.get());
// 輸出值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
}
執行程式，輸出結果為：
Connection to server successful. set status:true zaixian value in cache - Free Education
add 操作實例
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 列印狀態
System.out.println("set status:" + fo.get());
// 輸出
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 添加
fo = mcc.add("zaixian", 900, "memcached");
// 列印狀態
System.out.println("add status:" + fo.get());
// 添加新key
fo = mcc.add("codingground", 900, "All Free Compilers");
// 列印狀態
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
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 輸出執行 add 方法後的狀態
System.out.println("add status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 添加新的 key
fo = mcc.replace("zaixian", 900, "Largest Tutorials' Library");
// 輸出執行 set 方法後的狀態
System.out.println("replace status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
}
append 操作實例
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 輸出執行 set 方法後的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 對存在的key進行數據添加操作
fo = mcc.append("zaixian", 900, " for All");
// 輸出執行 set 方法後的狀態
System.out.println("append status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian 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
MemcachedJava.java 檔：
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("zaixian", 900, "Education for All");
// 輸出執行 set 方法後的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 對存在的key進行數據添加操作
fo = mcc.prepend("zaixian", 900, "Free ");
// 輸出執行 set 方法後的狀態
System.out.println("prepend status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian 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
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 輸出執行 set 方法後的狀態
System.out.println("set status:" + fo.get());
// 使用 get 方法獲取數據
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 通過 gets 方法獲取 CAS token（令牌）
CASValue casValue = mcc.gets("zaixian");
// 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("zaixian", casValue.getCas(), 900, "Largest Tutorials-Library");
// 輸出 CAS 回應資訊
System.out.println("CAS Response - " + casresp);
// 輸出值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex) {
System.out.println(ex.getMessage());
}
}
}
get 操作實例
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 輸出執行 set 方法後的狀態
System.out.println("set status:" + fo.get());
// 使用 get 方法獲取數據
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 關閉連接
mcc.shutdown();
}catch(Exception ex) {
System.out.println(ex.getMessage());
}
}
}
gets 操作實例、CAS
MemcachedJava.java 檔：
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("zaixian", 900, "Free Education");
// 輸出執行 set 方法後的狀態
System.out.println("set status:" + fo.get());
// 從緩存中獲取鍵為 zaixian 的值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 通過 gets 方法獲取 CAS token（令牌）
CASValue casValue = mcc.gets("zaixian");
// 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
MemcachedJava.java 檔：
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("zaixian", 900, "World's largest online tutorials library");
// 輸出執行 set 方法後的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian value in cache - " + mcc.get("zaixian"));
// 對存在的key進行數據添加操作
fo = mcc.delete("zaixian");
// 輸出執行 delete 方法後的狀態
System.out.println("delete status:" + fo.get());
// 獲取鍵對應的值
System.out.println("zaixian 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
MemcachedJava.java 檔：
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 方法後的狀態
System.out.println("set status:" + fo.get());
// 獲取鍵對應的值
System.out.println("value in cache - " + mcc.get("number"));
// 自增並輸出
System.out.println("value in cache after increment - " + mcc.incr("number", 111));
// 自減並輸出
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());
}
}
}