要連接和使用Java中的Redis，可以選擇Jedis或Lettuce客戶端。 1. Jedis簡(jiǎn)單輕量，適合小型項(xiàng)目，需添加依賴並使用同步方式連接及操作Redis；2. Lettuce更現(xiàn)代，支持異步操作，需添加依賴並通過(guò)RedisClient創(chuàng)建連接並使用同步或異步API；3. 通用建議包括使用連接池、處理異常、序列化複雜對(duì)像以及監(jiān)控內(nèi)存使用。兩種方案各具優(yōu)勢(shì)，選擇取決於具體需求。

Connecting to and using Redis with Java is pretty straightforward, especially when you go with one of the popular clients like Jedis or Lettuce . Both are solid choices, but they differ in usage style and features. Let's walk through how to set up and use each one effectively.

Setting Up Redis Connection Using Jedis

Jedis is a simple and lightweight Redis client for Java. It's great for small projects or when you want direct control over Redis commands.

First, add the Jedis dependency to your pom.xml if you're using Maven:

 <dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>4.0.1</version>
</dependency>

Then, here's how to connect and perform basic operations:

 import redis.clients.jedis.Jedis;

public class JedisExample {
    public static void main(String[] args) {
        // Connect to Redis server running locally
        try (Jedis jedis = new Jedis("localhost", 6379)) {
            // Set a key-value pair
            jedis.set("username", "john_doe");

            // Get the value back
            String username = jedis.get("username");
            System.out.println("Username: " username);
        }
    }
}

A few things to note:

• Always close the connection after use (use try-with-resources).
• You can also use connection pooling for better performance in production.
• Jedis is synchronous by default — every command blocks until it gets a response.

Connecting with Lettuce – A Modern Alternative

Lettuce is more modern and supports async/non-blocking operations out of the box. It uses Netty under the hood, making it suitable for high-performance applications.

Add the Lettuce dependency:

 <dependency>
    <groupId>io.lettuce.core</groupId>
    <artifactId>lettuce-core</artifactId>
    <version>6.2.0</version>
</dependency>

Here's a basic example:

 import io.lettuce.core.RedisClient;
import io.lettuce.core.api.StatefulRedisConnection;
import io.lettuce.core.api.sync.RedisCommands;

public class LettuceExample {
    public static void main(String[] args) {
        RedisClient client = RedisClient.create("redis://localhost:6379");
        try (StatefulRedisConnection<String, String> connection = client.connect()) {
            RedisCommands<String, String> syncCommands = connection.sync();

            // Set and get values
            syncCommands.set("email", "john@example.com");
            String email = syncCommands.get("email");
            System.out.println("Email: " email);
        }
    }
}

Some advantages of Lettuce:

• Supports asynchronous and reactive programming models.
• Thread-safe connections — you can reuse a single connection across threads.
• Built-in support for Redis clusters and SSL.

Handling Common Scenarios and Tips

Whether you choose Jedis or Lettuce, there are some common practices that apply:

• Use connection pooling with Jedis : Without pooling, creating too many connections can lead to resource exhaustion. Use JedisPool to manage this efficiently.

• Error handling is important : Always handle exceptions like connection timeouts or authentication errors gracefully.

• Serialization matters : When storing complex objects, serialize them (eg, using JSON) before saving to Redis. Both clients work best with strings unless you're using Spring Data Redis or another abstraction layer.

• Monitor memory usage : Redis stores everything in memory, so be careful not to overload it with large data sets.

So yeah, connecting Redis from Java isn't complicated once you know which client to use. If you want something quick and easy, go with Jedis. If you're building a scalable or non-blocking app, Lettuce might be the better fit.

基本上就這些。

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