如何使用 Jedis 在 Java 中使用 Redis

迈不过友情╰ 2023-10-01 19:11 18阅读 0赞

关于如何在 Java 中使用 redis 有多个客户端。在本教程中，我们将使用 Jedis，一个简单、快速的 Redis Java 客户端。我们还将使用 Maven 作为我们的构建工具，否则您可以在项目中导入 jedis 的 jar 文件。此外，这假设您已经安装了 redis 服务器，如果没有，请访问[此链接以了解如何配置一个][Link 1]。

### **1.添加Jedis依赖使用Redis** ###

我们需要在 pom.xml 中添加 jedis 依赖才能使用 jedis。在您的**pom.xml**中，在 Dependencies 部分下，添加

<dependencies>
    
    		<dependency>
    			<groupId>redis.clients</groupId>
    			<artifactId>jedis</artifactId>
    			<version>2.9.0</version>
    		</dependency>
    
    	</dependencies>

### **2.创建示例类** ###

这是一个简单的 Java 类。它使用 Redis的**SET**和**HASH**命令。您可以在他们的网站上学习 Redis 中的不同命令。

**JedisMain.java**

package jedisdemo;
    
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    import redis.clients.jedis.exceptions.JedisException;
    
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Set;
    
    public class JedisMain {
    
    	// address of your redis server
    	private static final String redisHost = "localhost";
    	private static final Integer redisPort = 6379;
    
    	// the jedis connection pool..
    	private static JedisPool pool = null;
    
    	public JedisMain() {
    		// configure our pool connection
    		pool = new JedisPool(redisHost, redisPort);
    
    	}
    
    	public void addSets() {
    		// let us first add some data in our redis server using Redis SET.
    		String key = "members";
    		String member1 = "Sedarius";
    		String member2 = "Richard";
    		String member3 = "Joe";
    
    		// get a jedis connection jedis connection pool
    		Jedis jedis = pool.getResource();
    		try {
    			// save to redis
    			jedis.sadd(key, member1, member2, member3);
    
    			// after saving the data, lets retrieve them to be sure that it has really added
    			// in redis
    			Set members = jedis.smembers(key);
    			for (Object member : members) {
    				System.out.println(member);
    			}
    		} catch (JedisException e) {
    			// if something wrong happen, return it back to the pool
    			if (null != jedis) {
    				pool.returnBrokenResource(jedis);
    				jedis = null;
    			}
    		} finally {
    			/// it's important to return the Jedis instance to the pool once you've finished
    			/// using it
    			if (null != jedis)
    				pool.returnResource(jedis);
    		}
    	}
    
    	public void addHash() {
    		// add some values in Redis HASH
    		String key = "javapointers";
    		Map<String, String> map = new HashMap<>();
    		map.put("name", "Java Pointers");
    		map.put("domain", "www.javapointers.com");
    		map.put("description", "Learn how to program in Java");
    
    		Jedis jedis = pool.getResource();
    		try {
    			// save to redis
    			jedis.hmset(key, map);
    
    			// after saving the data, lets retrieve them to be sure that it has really added
    			// in redis
    			Map<String, String> retrieveMap = jedis.hgetAll(key);
    			for (String keyMap : retrieveMap.keySet()) {
    				System.out.println(keyMap + " " + retrieveMap.get(keyMap));
    			}
    
    		} catch (JedisException e) {
    			// if something wrong happen, return it back to the pool
    			if (null != jedis) {
    				pool.returnBrokenResource(jedis);
    				jedis = null;
    			}
    		} finally {
    			/// it's important to return the Jedis instance to the pool once you've finished
    			/// using it
    			if (null != jedis)
    				pool.returnResource(jedis);
    		}
    	}
    
    	public static void main(String[] args) {
    		JedisMain main = new JedisMain();
    		main.addSets();
    		main.addHash();
    	}
    }

### **3.运行Main方法** ###

运行类文件，它应该打印以下值：

Sedarius
    Joe
    Richard
    name Java Pointers
    description Learn how to program in Java
    domain www.javapointers.com

在我们的 Redis 服务器中验证这一点，以确保它确实保存了数据

![d76e2b3da360e8912c8543ea8958448f.png][]

[Link 1]: https://javapointers.com/tutorial/install-redis/
[d76e2b3da360e8912c8543ea8958448f.png]: https://img-blog.csdnimg.cn/img_convert/d76e2b3da360e8912c8543ea8958448f.png