Jedis连接Redis,Lettuce连接Redis
Jedis连接Redis
1. 创建maven项目
2. 引入依赖
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
</dependencies>
3. 测试
@Test
public void Test1() {
// 连接Redis
Jedis jedis = new Jedis("localhost", 6379);
// 操作Redis - 因为Redis命令是什么,Jedis方法就是什么
jedis.set("name", "李四");
// 释放资源
jedis.close();
System.out.println(jedis.get("name"));
}
Jedis如何存储一个对象到Redis
准备一个User实体类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {
private String name;
private String Date;
}
导入spring-context依赖
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
创建Demo测试类,编写内容
@Test
public void Test2() {
// 连接Redis
Jedis jedis = new Jedis("localhost", 6379);
// 准备key(String) -value (user)
String key = "user";
User value = new User("张三", "1999");
// 将key和value转换为byte[]
byte[] byteKey = SerializationUtils.serialize(key);
byte[] byteValue = SerializationUtils.serialize(value);
// 将key和value存储到Redis
jedis.set(byteKey, byteValue);
// 释放资源
jedis.close();
Jedis如何从Redis读取一个对象
测试
@Test
public void Test3() {
// 连接Redis
Jedis jedis = new Jedis("localhost", 6379);
// 准备一个key
String key = "user";
// 将key转换为字节数组类型
byte[] byteKey = SerializationUtils.serialize(key);
// jedis去redis中获取value
byte[] value = jedis.get(byteKey);
// 将value反序列化
User user = (User) SerializationUtils.deserialize(value);
System.out.println(user);
// 释放资源
jedis.close();
}
如何将一个对象以字符串的形式存储到Redis
导入依赖
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.70</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
测试
@Test
public void test1(){
// 连接Redis
Jedis jedis = new Jedis("localhost",6379);
// 准备key(String) - value(User)
String key = "stringUser";
User value = new User("帅哥","19999");
// 使用fastJSON将value转换为json字符串
String stringValue = JSON.toJSONString(value);
// 存储到Redis中
jedis.set(key,stringValue);
// 释放资源
jedis.close();
}
如何得到Redis中以字符串(JSON)存在形式的对象
依赖同上
测试
@Test
public void test2(){
// 连接Redis
Jedis jedis = new Jedis("localhost",6379);
//准备一个key
String key = "stringUser";
//去Redis中查询value
String value = jedis.get(key);
//将value反序列化一个对象
User user = JSON.parseObject(value, User.class);
System.out.println("user = "+ user);
// 释放资源
jedis.close();
}
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