java操作redis簡單示例

java操作redis簡單示例

    初學redis，在java語言和環境下完成redis的入門學習。

        

    首先，官網下載源碼，編譯，安裝，修改配置文件redis.conf中的三項：

    1. 註釋掉 bind 127.0.0.1

    2. daemonize no 改爲 daemonize yes

    3. protected-mode yes 改爲protected-mode no

 

    這樣的話運行 redis-server  redis.conf 默認就是在後臺運行的了，而且，允許遠程主機連接。

    使用jedis作爲驅動來完成java程序訪問redis服務器，測試代碼如下：

    

Jedis jedis = new Jedis("192.168.100.103", 6379);
	res = jedis.ping();
	System.out.println(res);

    輸出PONG說明連接成功！

    1. 使用redis的list數據結構完成生產者-消費者模型

	//Redis Server IP Port
	private static String redisServerIP 	= "192.168.100.103";
	private static int    redisServerPort	= 6379;
	
	//生產者數據存儲隊列
	private static String key_src  = "task-queue";
	private static String key_tmp  = "tmp-queue";
	
	public static class Producer implements Runnable{

		Jedis jedis = new Jedis(redisServerIP, redisServerPort);
				
		public void run() {
			while(true) {
				//使用UUID模擬產生了一個任務
				String str = UUID.randomUUID().toString();
				
				//加入隊列
				jedis.lpush(key_src, str);
				System.out.println("插入了一個新任務: " + str + "當前任務總數:" + jedis.llen(key_src));				
								
				try {
					Random random = new Random();
					Thread.sleep(random.nextInt(500) + 500);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	public static class Consumer implements Runnable {

		Jedis jedis = new Jedis(redisServerIP, redisServerPort);
		public void run() {
			while(true) {
				//從隊列中取出任務
				String taskID = jedis.rpoplpush(key_src, key_tmp );
				if (taskID != null) {
					//處理任務
					//.....
					System.out.println("處理一個新任務: " + taskID + "當前任務總數: " + jedis.llen(key_src));
					
				}
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			
		}		
	}
	

	
	public static void main(String[] args) {
		
		
		new Thread(new Producer()).start();   //生產者線程
		new Thread(new Consumer()).start();	  //消費者線程
		
		try {
			Thread.sleep(Long.MAX_VALUE);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

    2. 採用hash結構完成最簡單的購物車模型

	private static String redisServerIP 	= "192.168.100.103";
	private static int    redisServerPort	= 6379;
	
	private static String hash_name  = "ShoppingCart";
	
	public static void main(String[] args) {
		
		Jedis jedis = new Jedis(redisServerIP, redisServerPort);
		
		//模擬購物車中的數據
		Map<String, String> goodsMap = new HashMap<String, String>();
		goodsMap.put("java",    "5");
		goodsMap.put("C/C++",   "3");
		goodsMap.put("Node.js", "10");
		goodsMap.put("C#",      "10");
		
		//hmset命令
		jedis.hmset(hash_name, goodsMap);
		
		System.out.println("當前共有 " + jedis.hlen(hash_name) + "個fields");
		
		List<String> fields = new ArrayList<String>();
		
		Set<String> keySet = jedis.hkeys(hash_name);
		Iterator i = keySet.iterator();
		while (i.hasNext()) {
			fields.add(i.next().toString());
		}
		
		//hmget命令
		List<String> list = jedis.hmget(hash_name, fields.get(0), fields.get(1), fields.get(2));
		System.out.println(list);
		
		//hgetall命令
		Map<String, String> map = jedis.hgetAll(hash_name);
		
		Set<Entry<String, String>> entrySet = map.entrySet();
		for (Entry<String, String> entry: entrySet) {
			System.out.println(entry.getKey() + ": " + entry.getValue());
		}
	    
		jedis.disconnect();
		
	}

    3. 事物測試

	private static String redisServerIP 	= "192.168.100.103";
	private static int    redisServerPort	= 6379;
	
	public static void main(String[] args) {
		Jedis jedis = new Jedis(redisServerIP, redisServerPort);
		long start = System.currentTimeMillis();
		//開啓事物
		Transaction transaction = jedis.multi();		
		
		Map<String, String> map = new HashMap<String, String>();
    	map.put("username", "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
    	map.put("password", "123456");
    	map.put("age",      "25");
    	map.put("gender",   "man");
    	map.put("email",    "[email protected]");
    	map.put("address",  "中國廣東省深圳市");
    	map.put("tel",      "18888888888");
    	map.put("position", "軟件工程師");
    	map.put("birth_date",   "2016-01-01 00:00:00");
    	map.put("tel",       "2016-01-01 00:00:00");
    	
    	int totalRecords = 1024;
		
	    for (int i = 0; i < totalRecords; i++) {
	    	String key = "user_" + i;
	        Response<String> result = transaction.hmset(key, map);
	    }
	    
	    //提交事物
	    List<Object> list = transaction.exec();
	    System.out.println("插入數據量: " + list.size());
	    long end = System.currentTimeMillis();
	    System.out.println("總共用時: " + ((end - start)/1000.0) + " seconds");
	    
		jedis.disconnect();
	}

    4. 採用zset完成最熱商品排序功能

	private static String redisServerIP 	= "192.168.100.103";
	private static int    redisServerPort	= 6379;
	
	private static String productTopNKey = "productTopN";
	
	//商品熱搜榜
	public static class ProductHotN implements Runnable {

		Jedis jedis = new Jedis(redisServerIP, redisServerPort);
		//構造熱搜的商品
		String[] productTopN = {"iPhone7 Plus", "P9 Plus", "XiaoMi Note", "Vivo X7 Plus", "Galaxy Note7"};
		
		//模擬商搜索次數的變化
		public void run() {
			while (true) {
				Random random = new Random();
				//隨機挑一個商品
				String product = productTopN[random.nextInt(5)];
				
				//搜索度自增1
				jedis.zincrby(productTopNKey, 1, product);	
				
				try {
					Thread.sleep(500);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	//查看商品熱搜榜
	public static class HotViewer implements Runnable {

		Jedis jedis = new Jedis(redisServerIP, redisServerPort);
		int i = 1;
		public void run() {
			while (true) {
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				
				System.out.println("第" + i + "次獲取排行榜");
				Set<Tuple> set = jedis.zrevrangeWithScores(productTopNKey, 0, -1);
				for (Tuple tuple: set) {
					System.out.println(tuple.getElement() + ": " + tuple.getScore());
				}
				
				i ++;
			}
		}
	}
	
	public static void main(String[] args) {
		new Thread(new ProductHotN()).start();
		new Thread(new HotViewer()).start();
		
		try {
			Thread.sleep(Long.MAX_VALUE);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}