1. 启动 Redis Server
启动 redis server,如下图所示,端口号 6379:
2. 工程实例
2.1 工程目录
工程目录如下图所示:
2.2 pom.xml
引入依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
完整 pom.xml 如下所示:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.syrdbt</groupId>
<artifactId>redis-study</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>redis-study</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.3 Java 源文件
启动类,RedisStudyApplication.java:
package com.syrdbt.redis.study;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class RedisStudyApplication {
public static void main(String[] args) {
SpringApplication.run(RedisStudyApplication.class, args);
}
}
控制器,RedisStudyController.java:
这里使用 SpringBoot 内置的与 Redis 的工具类:RedisTemplate;
除了 RedisTemplate,SpringBoot 还内置了 StringRedisTemplate ;
StringRedisTemplate 只能对 key=String,value=String 的键值对进行操作,RedisTemplate 可以对任何类型的 key-value 键值对操作;StringRedisTemplate 继承了 RedisTemplate。
package com.syrdbt.redis.study.controller;
import com.sun.tools.javac.code.Attribute;
import com.syrdbt.redis.study.constant.Constant;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.io.Console;
@RestController
public class RedisStudyController {
@Autowired
private RedisTemplate redisTemplate;
@GetMapping("/redis/get")
public String visitStringByKey(@RequestParam String key) {
return (String) redisTemplate.opsForValue().get(Constant.NAMESPACE + ":" + key);
}
@GetMapping("/redis/set")
public String visitStringByKey(@RequestParam String key, @RequestParam String value) {
try {
redisTemplate.opsForValue().set(Constant.NAMESPACE + ":" + key, value);
} catch (Exception e) {
return "error";
}
return "success";
}
}
redis 配置类,RedisConfig.java :
package com.syrdbt.redis.study.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericToStringSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
@Configuration
public class RedisConfig {
private final RedisTemplate redisTemplate;
@Autowired
public RedisConfig(RedisTemplate redisTemplate) {
this.redisTemplate = redisTemplate;
}
@Bean
@SuppressWarnings("unchecked")
public RedisTemplate<String, Object> redisTemplate() {
RedisSerializer<String> stringSerializer = new StringRedisSerializer();
RedisSerializer<Object> jsonString = new GenericToStringSerializer<>(Object.class);
redisTemplate.setKeySerializer(stringSerializer);
redisTemplate.setValueSerializer(jsonString);
redisTemplate.setHashKeySerializer(stringSerializer);
redisTemplate.setHashValueSerializer(jsonString);
return redisTemplate;
}
}
常量类用作 redis key 的前缀,Constant.java:
package com.syrdbt.redis.study.constant;
public class Constant {
public static final String NAMESPACE = "REDIS-STUDY";
}
3. 测试
写操作,访问 http://localhost:8080/redis/set?key=name&value=syrdbt 。
读操作,访问http://localhost:8080/redis/get?key=name
4. 问题
整合 redis 的写入和读出的实例已经完成了。
不过还有 2 个问题:
- 我没并没有设置主机号、端口号、用户名、密码就访问了 redis,显然 SpringBoot 默认配置了这些,我本机的redis下载之后没有修改密码等配置,所以才可以访问。
- 正常境况下,不应该直接使用 redisTmplate,应该封装成工具类,这样方便大家使用。
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