Java se connecte au service Memcached
Pour utiliser un programme Java pour vous connecter à Memcached, vous devez ajouter le package jar Memcached à votre chemin de classe.
Le programme suivant suppose que l'hôte du service Memcached est 127.0.0.1 et que le port est 11211.
Exemple de connexion
Connexion Java à 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() );
}
}
}Dans ce programme, nous utilisons InetSocketAddress pour nous connecter au service memcached avec IP 127.0.0.1 et port 11211.
Exécutez le code ci-dessus. Si la connexion réussit, les informations suivantes seront affichées :
Connection to server successful.
exemple d'opération de définition
Ce qui suit utilise java.util.concurrent.Future pour stocker des données
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("php", 900, "Free Education");
// 查看存储状态
System.out.println("set status:" + fo.get());
// 输出值
System.out.println("php value in cache - " + mcc.get("php"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
} Exécutez le programme et le résultat de sortie est :
Connection to server successful. set status:true php value in cache - Free Education
ajouter une instance d'opération
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("php", 900, "Free Education");
// 打印状态
System.out.println("set status:" + fo.get());
// 输出
System.out.println("php value in cache - " + mcc.get("php"));
// 添加
Future fo = mcc.add("php", 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());
}
}
}remplacer une instance d'opération
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("php", 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("php value in cache - " + mcc.get("php"));
// 添加新的 key
fo = mcc.replace("php", 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("php value in cache - " + mcc.get("php"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex){
System.out.println( ex.getMessage() );
}
}
}ajouter une instance d'opération
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("php", 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("php value in cache - " + mcc.get("php"));
// 对存在的key进行数据添加操作
Future fo = mcc.append("php", 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("php value in cache - " + mcc.get("codingground"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}préajouter l'instance d'opération
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("php", 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("php value in cache - " + mcc.get("php"));
// 对存在的key进行数据添加操作
Future fo = mcc.prepend("php", 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("php value in cache - " + mcc.get("codingground"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}instance d'opération 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("php", 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("php value in cache - " + mcc.get("php"));
// 通过 gets 方法获取 CAS token（令牌）
CASValue casValue = mcc.gets("php");
// 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("php", 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("php value in cache - " + mcc.get("php"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}obtenir l'instance d'opération
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("php", 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("php value in cache - " + mcc.get("php"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}obtient l'instance d'opération, 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("php", 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 php 的值
System.out.println("php value in cache - " + mcc.get("php"));
// 通过 gets 方法获取 CAS token（令牌）
CASValue casValue = mcc.gets("php");
// 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());
}
}opération de suppression instance
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("php", 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("php value in cache - " + mcc.get("php"));
// 对存在的key进行数据添加操作
Future fo = mcc.delete("php");
// 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("php value in cache - " + mcc.get("codingground"));
// 关闭连接
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}Exemple d'opération Incr /Decr
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());
}
}
