Springboot2.0访问Redis集群

Redis 是一个开源（BSD许可）的，内存中的数据结构存储系统，它可以用作高性能的key-value数据库、缓存和消息中间件，掌握它是程序员的必备技能，下面是一个springboot访问redis的demo。

新建一个springboot项目，这里取名spring-boot-demo

项目结构目录如下

pom.xml文件内容

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>com.carry</groupId>
 8     <artifactId>spring-boot-demo</artifactId>
 9     <version>0.0.1-SNAPSHOT</version>
10     <packaging>jar</packaging>
11 
12     <name>spring-boot-demo</name>
13     <description>Demo project for Spring Boot</description>
14 
15     <parent>
16         <groupId>org.springframework.boot</groupId>
17         <artifactId>spring-boot-starter-parent</artifactId>
18         <version>2.0.2.RELEASE</version>
19         <relativePath /> <!-- lookup parent from repository -->
20     </parent>
21 
22     <properties>
23         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
24         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
25         <java.version>1.8</java.version>
26         <mybatis.version>1.3.2</mybatis.version>
27     </properties>
28 
29     <dependencies>
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter-data-redis</artifactId>
33         </dependency>
34         <dependency>
35             <groupId>org.springframework.boot</groupId>
36             <artifactId>spring-boot-starter-web</artifactId>
37         </dependency>
38         <dependency>
39             <groupId>org.mybatis.spring.boot</groupId>
40             <artifactId>mybatis-spring-boot-starter</artifactId>
41             <version>${mybatis.version}</version>
42         </dependency>
43         <dependency>
44             <groupId>org.apache.commons</groupId>
45             <artifactId>commons-pool2</artifactId>
46         </dependency>
47         <dependency>
48             <groupId>org.springframework.boot</groupId>
49             <artifactId>spring-boot-devtools</artifactId>
50             <scope>runtime</scope>
51         </dependency>
52         <dependency>
53             <groupId>mysql</groupId>
54             <artifactId>mysql-connector-java</artifactId>
55             <scope>runtime</scope>
56         </dependency>
57         <dependency>
58             <groupId>org.springframework.boot</groupId>
59             <artifactId>spring-boot-starter-test</artifactId>
60             <scope>test</scope>
61         </dependency>
62     </dependencies>
63 
64     <build>
65         <plugins>
66             <plugin>
67                 <groupId>org.springframework.boot</groupId>
68                 <artifactId>spring-boot-maven-plugin</artifactId>
69                 <configuration>
70                     <fork>true</fork>
71                 </configuration>
72             </plugin>
73         </plugins>
74     </build>
75 
76 
77 </project>

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下面我们来配置redis，因为需要用到mysql数据库，这里使用mybatis访问

application.yml文件内容

 1 #mybatis配置
 2 mybatis:
 3   mapper-locations: classpath:mapper/*Mapper.xml
 4   type-aliases-package: com.carry.domain
 5 #数据源
 6 spring:
 7   datasource:
 8     url: jdbc:mysql://192.168.68.100:3306/test
 9     driver-class-name: com.mysql.jdbc.Driver
10     username: root
11     password: 123456
12   #jackson时间格式化
13   jackson:
14     time-zone: GMT+8
15     date-format: yyyy-MM-dd HH:mm:ss
16   #redis配置
17   redis:
18     cluster:
19       nodes: 192.168.68.100:7000,192.168.68.100:7001,192.168.68.101:7000,192.168.68.101:7001,192.168.68.102:7000,192.168.68.102:7001
20     timeout: 6000ms
21     password: 123456
22     lettuce:
23       pool:
24         max-active: 8
25         max-wait: -1ms
26         max-idle: 8
27         min-idle: 0
28     database: 0

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新建文件RedisConfig.java，内容如下

 1 package com.carry.config;
 2 
 3 import com.fasterxml.jackson.annotation.JsonAutoDetect;
 4 import com.fasterxml.jackson.annotation.PropertyAccessor;
 5 import com.fasterxml.jackson.databind.ObjectMapper;
 6 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 7 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
 8 import org.springframework.context.annotation.Bean;
 9 import org.springframework.context.annotation.Configuration;
10 import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
11 import org.springframework.data.redis.core.RedisTemplate;
12 import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
13 
14 @Configuration
15 @AutoConfigureAfter(RedisAutoConfiguration.class)
16 public class RedisConfig {
17 
18     @Bean
19     public RedisTemplate<String, Object> redisCacheTemplate(LettuceConnectionFactory redisConnectionFactory) {
20         //redis序列化器
21         Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
22         ObjectMapper om = new ObjectMapper();
23         om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
24         om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
25         jackson2JsonRedisSerializer.setObjectMapper(om);
26         RedisTemplate<String, Object> template = new RedisTemplate<>();
27         template.setConnectionFactory(redisConnectionFactory);
28         template.setKeySerializer(jackson2JsonRedisSerializer);
29         template.setValueSerializer(jackson2JsonRedisSerializer);
30         template.setHashKeySerializer(jackson2JsonRedisSerializer);
31         template.setHashValueSerializer(jackson2JsonRedisSerializer);
32         return template;
33     }
34 }

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最后在项目启动类SpringBootDemoApplication上加上注解@EnableCaching开启缓存

配置至此结束，下面我们来通过代码来访问redis集群

先写一个访问mysql的mapper，其中只包含一个方法List<User> findAll();

对应SQL语句为select * from user

User实体类跟user表字段一一对应

UserServiceImpl代码内容

 1 package com.carry.service.impl;
 2 
 3 import java.util.List;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.cache.annotation.Cacheable;
 7 import org.springframework.stereotype.Service;
 8 
 9 import com.carry.domain.User;
10 import com.carry.mapper.UserMapper;
11 import com.carry.service.UserService;
12 
13 @Service
14 public class UserServiceImpl implements UserService {
15 
16     @Autowired
17     private UserMapper userMapper;
18 
19     @Cacheable(value = "findAll", key = "'test'")
20     public List<User> findAll() {
21         System.out.println("如果没打印这句话，说明走了缓存！");
22         return userMapper.findAll();
23     }
24 }

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UserController代码内容

 1 package com.carry.controller;
 2 
 3 import java.util.List;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.web.bind.annotation.GetMapping;
 7 import org.springframework.web.bind.annotation.RestController;
 8 
 9 import com.carry.domain.User;
10 import com.carry.service.UserService;
11 
12 @RestController
13 public class UserController {
14 
15     @Autowired
16     private UserService userService;
17 
18     @GetMapping("/getUsers")
19     public List<User> getUsers(){
20         return userService.findAll();
21     }
22 
23 }

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最后启动项目在浏览器中访问http://localhost:8080/getUsers

第一次访问控制台输出“如果没打印这句话，说明走了缓存！”

再次访问控制台则没有输出。

我们通过redis-cli连接redis会发现key值是一个很奇怪的值

其实就是我们在@Cacheable注解配的值拼起来的

需要注意的是key的值需要用单引号''引起来不然会报错

 最后写了几个test case，读者自己去运行看看控制台会输出什么

  1 package com.carry;
  2 
  3 import java.util.Date;
  4 import java.util.HashSet;
  5 import java.util.List;
  6 import java.util.Map;
  7 import java.util.Set;
  8 import java.util.concurrent.ExecutorService;
  9 import java.util.concurrent.Executors;
 10 import java.util.stream.IntStream;
 11 
 12 import org.junit.Test;
 13 import org.junit.runner.RunWith;
 14 import org.slf4j.Logger;
 15 import org.slf4j.LoggerFactory;
 16 import org.springframework.beans.factory.annotation.Autowired;
 17 import org.springframework.boot.test.context.SpringBootTest;
 18 import org.springframework.data.redis.core.Cursor;
 19 import org.springframework.data.redis.core.DefaultTypedTuple;
 20 import org.springframework.data.redis.core.HashOperations;
 21 import org.springframework.data.redis.core.ListOperations;
 22 import org.springframework.data.redis.core.RedisTemplate;
 23 import org.springframework.data.redis.core.ScanOptions;
 24 import org.springframework.data.redis.core.SetOperations;
 25 import org.springframework.data.redis.core.StringRedisTemplate;
 26 import org.springframework.data.redis.core.ValueOperations;
 27 import org.springframework.data.redis.core.ZSetOperations;
 28 import org.springframework.test.context.junit4.SpringRunner;
 29 
 30 import com.carry.domain.User;
 31 
 32 @RunWith(SpringRunner.class)
 33 @SpringBootTest
 34 public class SpringBootDemoApplicationTests {
 35 
 36     private static final Logger log = LoggerFactory.getLogger(SpringBootDemoApplicationTests.class);
 37 
 38 
 39     @Autowired
 40     private StringRedisTemplate stringRedisTemplate;
 41 
 42     @Autowired
 43     private RedisTemplate<String, Object> redisCacheTemplate;
 44 
 45 
 46     @Test
 47     public void redisTest() {
 48         ExecutorService executorService = Executors.newFixedThreadPool(1000);
 49         IntStream.range(0, 1000).forEach(i ->
 50                 executorService.execute(() -> stringRedisTemplate.opsForValue().increment("kk", 1))
 51         );
 52     }
 53 
 54     @Test
 55     public void redisTestString() {
 56         stringRedisTemplate.opsForValue().set("carry", "chan");
 57         final String v1 = stringRedisTemplate.opsForValue().get("carry");
 58         log.info("[字符缓存结果] - [{}]", v1);
 59     }
 60 
 61     @Test
 62     public void redisTestObject() {
 63         //以下只演示整合，具体Redis命令可以参考官方文档，Spring Data Redis 只是改了个名字而已，Redis支持的命令它都支持
 64         String key = "carry:user:1";
 65         ValueOperations<String, Object> valueOperations = redisCacheTemplate.opsForValue();
 66         valueOperations.set(key, new User(1, "carry", new Date(), "longhua"));
 67         //对应 String（字符串）
 68         final User user = (User) valueOperations.get(key);
 69         log.info("[对象缓存结果] - [{}]", user);
 70     }
 71 
 72     @Test
 73     public void redisTestList() {
 74         ListOperations<String, Object> listOperations = redisCacheTemplate.opsForList();
 75         listOperations.trim("key1", 1, 0);
 76         List<Object> list = listOperations.range("key1", 0, -1);
 77         log.info("[对象缓存结果] - {}", list);
 78         listOperations.leftPush("key1", 1);
 79         listOperations.leftPush("key1", 2);
 80         listOperations.rightPush("key1", 3);
 81         list = listOperations.range("key1", 0, -1);
 82         log.info("[对象缓存结果] - {}", list);
 83     }
 84 
 85     @Test
 86     public void redisTestHash() {
 87         HashOperations<String, Object, Object> hashOperations = redisCacheTemplate.opsForHash();
 88         hashOperations.put("hkey", "k1", "v1");
 89         hashOperations.put("hkey", "k2", "v2");
 90         hashOperations.put("hkey", "k3", "v3");
 91         Map<Object, Object> map = hashOperations.entries("hkey");
 92         log.info("[对象缓存结果] - [{}]", map);
 93     }
 94 
 95     @Test
 96     public void redisTestSet() {
 97         SetOperations<String, Object> setOperations = redisCacheTemplate.opsForSet();
 98         setOperations.add("skey", "v1", "v2", "v3", "v4");
 99         Cursor<Object> cursor = setOperations.scan("skey", ScanOptions.NONE);
100         while (cursor.hasNext()) {
101             System.out.println(cursor.next());
102         }
103         log.info("[对象缓存结果] - [{}]", cursor);
104     }
105 
106     @Test
107     public void redisTestZSet() {
108         ZSetOperations<String, Object> zSetOperations = redisCacheTemplate.opsForZSet();
109         ZSetOperations.TypedTuple<Object> tuple1 = new DefaultTypedTuple<>("v1", 9.6);
110         ZSetOperations.TypedTuple<Object> tuple2 = new DefaultTypedTuple<>("v2", 9.9);
111         Set<ZSetOperations.TypedTuple<Object>> tuples = new HashSet<>();
112         tuples.add(tuple1);
113         tuples.add(tuple2);
114         zSetOperations.add("zkey", tuples);
115         Set<Object> set = zSetOperations.range("zkey", 0, -1);
116         log.info("[对象缓存结果] - {}", set);
117     }
118 }

SpringBootDemoApplicationTests

 

来源：oschina

链接：https://my.oschina.net/u/4274927/blog/3885993