三、案例：springboot整合redis五种数据结构API
- string（字符串）类型
- hash（哈希）类型
- list（列表）类型
- set（无序集合）类型
- zset（有序集合）类型
pom依赖
<!--redis -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<version>2.3.4.RELEASE</version>
</dependency>
<!--redis锁-->
<dependency>
<groupId>org.redisson</groupId>
<artifactId>redisson</artifactId>
<version>3.13.6</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.10.1</version>
</dependency>
环境变量配置，redis采用windows的客户端启动，链接本地
#redis
spring.redis.database=15
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=
spring.redis.pool.max-active=200
spring.redis.jedis.pool.max-wait= -1
spring.redis.jedis.pool.max-idle=10
spring.redis.jedis.pool.min-idle=0
spring.redis.timeout = 10000
User实体
package com.example.demo.bean;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
//姓名
private String name;
//密码
private String password;
}
1、string（字符串）类型
使用场景：key-value缓存、计数
操作对象：redisTemplate.opsForValue()
添加数据：set(Object k, Object v);
获取数据：get(Object k);
获取数据长度：size(Object k);
拼接内容：append(Object k, String s);
数值加一：increment(Object k);
数值减一：decrement(Object k);
package com.example.demo.controller;
import com.alibaba.fastjson.JSONObject;
import com.example.demo.DemoApplication;
import com.example.demo.bean.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@SpringBootTest(classes = DemoApplication.class)
@RunWith(SpringRunner.class)
public class RedisControllerTest {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private StringRedisTemplate stringRedisTemplate;
//string类型添加
@Test
public void stringAdd() {
// 添加redis 字符类型数据 strKey1
redisTemplate.opsForValue().set("strKey1","一段话。。。");
// 添加redis 字符类型数据 strKey2
JSONObject json = new JSONObject();
json.put("dog","狗");
json.put("cat","猫");
redisTemplate.opsForValue().set("strKey2",json.toJSONString());
}
//string类型查询
@Test
public void stringQuery() {
// 通过 strKey1 获取并打印值
System.err.println(redisTemplate.opsForValue().get("strKey1"));
// 通过 strKey2 获取并打印值
System.err.println(redisTemplate.opsForValue().get("strKey2"));
}
2、hash（哈希）类型
使用场景：缓存对象（string类型也可以实现-值存json对象字符串）
操作对象：redisTemplate.opsForHash()
添加数据：put(Object h, Object hk, Object hv);
获取map对象某值：get(Object h, Object o);
获取map对象：entries(Object h);
package com.example.demo.controller;
import com.alibaba.fastjson.JSONObject;
import com.example.demo.DemoApplication;
import com.example.demo.bean.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@SpringBootTest(classes = DemoApplication.class)
@RunWith(SpringRunner.class)
public class RedisControllerTest {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private StringRedisTemplate stringRedisTemplate;
//hash类型添加
@Test
public void hashAdd() {
// 添加数据
redisTemplate.opsForHash().put("hash1","key1","value1");
redisTemplate.opsForHash().put("hash1","key2","value2");
}
//hash类型查询
@Test
public void hashQuery() {
// 通过 h1 获取值
System.err.println(redisTemplate.opsForHash().get("hash1","key1"));
System.err.println(redisTemplate.opsForHash().entries("hash1"));
}
3、list（列表）类型
使用场景：队列、栈（左进右出:队列，左进左出:栈）
操作对象：redisTemplate.opsForList()
从列表左侧添加数据：leftPush(Object k, Object v);
从列表左侧取数据：leftPop(Object k);
从列表右侧取数据：rightPop(Object k);
package com.example.demo.controller;
import com.alibaba.fastjson.JSONObject;
import com.example.demo.DemoApplication;
import com.example.demo.bean.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@SpringBootTest(classes = DemoApplication.class)
@RunWith(SpringRunner.class)
public class RedisControllerTest {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private StringRedisTemplate stringRedisTemplate;
//list类型添加
@Test
public void listAdd() {
List list = new ArrayList<>();
User user1 = new User("老赵", "123");
User user2 = new User("老曹", "456");
list.add(user1);
list.add(user2);
// 直接添加list
redisTemplate.opsForList().leftPush("listKey",list);
//循环添加元素
redisTemplate.opsForList().leftPush("list1","v1");
redisTemplate.opsForList().leftPush("list1","v2");
redisTemplate.opsForList().leftPush("list1","v3");
}
//list类型查询
@Test
public void listQuery() {
System.err.println(redisTemplate.opsForList().leftPop("listKey"));
// 通过 list1 从队列左侧取出并删除数据
System.err.println(redisTemplate.opsForList().leftPop("list1"));
// 通过 list1 从队列右侧取出并删除数据
System.err.println(redisTemplate.opsForList().rightPop("list1"));
}
4、set（无序集合）类型
使用场景：无序且不重复的集合，求交、差、并集
操作对象：redisTemplate.opsForSet()
获取两个集合的交集：intersect(Object k, Object k1);
获取两个集合的差集：difference(Object k,Object k1);
获取两个集合的并集：union(Object k,Object k1);
package com.example.demo.controller;
import com.alibaba.fastjson.JSONObject;
import com.example.demo.DemoApplication;
import com.example.demo.bean.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@SpringBootTest(classes = DemoApplication.class)
@RunWith(SpringRunner.class)
public class RedisControllerTest {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private StringRedisTemplate stringRedisTemplate;
//set（无序集合）类型添加
@Test
public void setAdd() {
User user1 = new User("老赵", "123");
User user2 = new User("老曹", "456");
// 添加数据
redisTemplate.opsForSet().add("set1","v1","v2","v3");
redisTemplate.opsForSet().add("set2","v1");
redisTemplate.opsForSet().add("set3",user1, user2);
}
//set（无序集合）类型查询
@Test
public void setQuery() {
// 求交集
System.err.println(redisTemplate.opsForSet().intersect("set1","set2"));
// 求差集
System.err.println(redisTemplate.opsForSet().difference("set1","set2"));
// 求并集
System.err.println(redisTemplate.opsForSet().union("set1","set2"));
System.err.println(redisTemplate.opsForSet().members("set3"));
}
5、zset（有序集合）类型
使用场景：根据权重获取集合
操作对象：redisTemplate.opsForZSet()
添加数据：add(Object k, Object v, Object v1);
根据权重范围获取集合：rangeByScore(Object k,Object v,Object v1);
package com.example.demo.controller;
import com.alibaba.fastjson.JSONObject;
import com.example.demo.DemoApplication;
import com.example.demo.bean.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@SpringBootTest(classes = DemoApplication.class)
@RunWith(SpringRunner.class)
public class RedisControllerTest {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private StringRedisTemplate stringRedisTemplate;
//zset（有序集合）类型添加
@Test
public void zsetAdd() {
// 添加数据
redisTemplate.opsForZSet().add("zset1","A",1);
redisTemplate.opsForZSet().add("zset1","B",3);
redisTemplate.opsForZSet().add("zset1","C",2);
redisTemplate.opsForZSet().add("zset1","D",5);
}
//zset（有序集合）类型查询
@Test
public void zsetQuery() {
System.err.println(redisTemplate.opsForZSet().rangeByScore("zset1",1,4));
}
6、删除key
//删除key
@Test
public void deleteKey() {
//删除key
redisTemplate.delete("strKey1");
}
四、总结：
当你的redis数据库里面本来存的是字符串数据或者你要存取的数据就是字符串类型数据的时候，那么你就使用StringRedisTemplate即可，但是如果你的数据是复杂的对象类型，而取出的时候又不想做任何的数据转换，直接从Redis里面取出一个对象，那么使用RedisTemplate是更好的选择。
重要信息
