Memcached总结四：用ava程序连接memcached进行操作

1. Memcached的Java环境设置

需要下载spymemcached-2.10.3.jar，并把这个jar放到java程序的classpath中才能使用memcached。

在下面的程序，假设memcached服务器的主机IP是192.168.1.111，并在端口11211上运行。

1. Memcached添加数据(set方法)

/**      * set方法      */     public static void set() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11111));             // not set data into memcached server             System.out.println("set status:"                     + mcc.set("hello", 900, "helloworld"));             // Get value from cache             System.out.println("Get from Cache:" + mcc.get("hello"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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2. Memcached添加数据(add方法)

/**      * add方法      */     public static void add() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             mcc.add("key", 900, "memcached");             System.out.println(mcc.get("key"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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3. Memcached替换/Replace数据(replace方法)

/**      * replace方法      */     public static void replace() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             // 修改存在的键             System.out.println(mcc.get("key"));             mcc.replace("key", 900, "mongodb");             System.out.println(mcc.get("key"));// mongodb             // 修改不存在的键             mcc.replace("no", 900, "noexit");             System.out.println(mcc.get("no"));// null             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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4. Memcached追加/append方法(append方法)

/**      * append      */     public static void append() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.get("key"));             mcc.append("key", "nosql");             System.out.println(mcc.get("key"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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5. Memcached预先添(prepend方法)

/**      * prepend      */     public static void prepend() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.get("key"));             mcc.prepend("key", "redis");             System.out.println(mcc.get("key"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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6. Memcached cas命令(cas方法)

cas即checked and set的意思，只有当最后一个参数和gets所获取的参数匹配时才能存储，否则返回“EXISTS”。

要运行memcached的cas命令，需要从gets命令得到memcached令牌。

/**      * cas方法      */     public static void cas() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.get("key"));             long casToken = mcc.gets("key").getCas();             System.out.println(casToken);             mcc.cas("key", casToken, 900, "mongodb");             System.out.println(mcc.get("key"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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7. Memcached获取/get数据(get方法)

/**      * get方法      */     public static void get() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             // not set data into memcached server             System.out.println("set status:"                     + mcc.set("hello", 900, "helloworld"));             // Get value from cache             System.out.println("Get from Cache:" + mcc.get("hello"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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8. Memcached gets命令(gets方法)

/**      * gets方法      */     public static void gets() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             long casToken = mcc.gets("key").getCas();             System.out.println(casToken);             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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9. Memcached删除/Delete数据(delete方法)

/**      * delete方法      */     public static void delete() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.get("key"));             mcc.delete("key");             System.out.println(mcc.get("key"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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10. Memcached递增递减数据(incr方法和decr方法)

Memcached的incr 和 decr命令用于增加现有键的数值递减。如果键未找到或如果关键的不是数字，则返回NOT_FOUND。那么CLIENT_ERROR不能增加或返回递减非数值错误。

/**      * incr方法和decr方法      */     public static void incr_decr() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.get("num"));             mcc.incr("num", 5);             System.out.println(mcc.get("num"));             System.out.println("------------------>");             mcc.decr("num", 10);             System.out.println(mcc.get("num"));             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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11. Memcached Stats命令(stats命令)

/**      * stats方法      */     public static void stats() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.getStats());             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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12. Memcached清除数据(flush方法)

/**      * flush_all方法      */     public static void flush_all() {         try {             MemcachedClient mcc = new MemcachedClient(new InetSocketAddress(                     "192.168.1.111", 11211));             System.out.println(mcc.flush().isDone());             mcc.shutdown();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     }

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怀有希望!!