Springboot項目中使用redis的配置詳解
程序結構:
一、配置
1. 在pom.xml中添加依賴
pom.xml文件如下:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.lyy</groupId> <artifactId>redis-test</artifactId> <version>0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> <!--始終從倉庫中獲取--> <!--<relativePath/>--> </parent> <dependencies> <!--web應用基本環境,如mvc--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!--redis包--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> </dependencies> </project>
其中,spring-boot-starter-web包含springmvc。
2. 配置application.yml
application.yml文件如下:
server: port: 11011 servlet: context-path: /api/v1 spring: redis: # Redis數據庫索引(默認為0) database: 0 # Redis服務器地址 host: 127.0.0.1 # Redis服務器連接端口 port: 6379 # Redis服務器連接密碼(默認為空) # password: 123456
3. 通過配置類,設置redis
RedisConfig類如下:
package com.apollo.config; import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cache.annotation.EnableCaching; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.StringRedisSerializer; /** * @author :apollo * @since :Created in 2019/2/22 */ @Configuration @EnableCaching public class RedisConfig { @Autowired private ObjectMapper objectMapper; /** * 自定義springSessionDefaultRedisSerializer對象,將會替代默認的SESSION序列化對象。 * 默認是JdkSerializationRedisSerializer,缺點是需要類實現Serializable接口。 * 並且在反序列化時如果異常會拋出SerializationException異常, * 而SessionRepositoryFilter又沒有處理異常,故如果序列化異常時就會導致請求異常 */ @Bean(name = "springSessionDefaultRedisSerializer") public GenericJackson2JsonRedisSerializer getGenericJackson2JsonRedisSerializer() { return new GenericJackson2JsonRedisSerializer(); } /** * JacksonJsonRedisSerializer和GenericJackson2JsonRedisSerializer的區別: * GenericJackson2JsonRedisSerializer在json中加入@class屬性,類的全路徑包名,方便反系列化。 * JacksonJsonRedisSerializer如果存放瞭List則在反系列化的時候, * 如果沒指定TypeReference則會報錯java.util.LinkedHashMap cannot be cast。 */ @Bean public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) { RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>(); redisTemplate.setConnectionFactory(connectionFactory); // 使用Jackson2JsonRedisSerialize 替換默認序列化 Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); jackson2JsonRedisSerializer.setObjectMapper(objectMapper); // 設置value的序列化規則和 key的序列化規則 redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); redisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setHashKeySerializer(jackson2JsonRedisSerializer); redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer); redisTemplate.setDefaultSerializer(jackson2JsonRedisSerializer); redisTemplate.setEnableDefaultSerializer(true); redisTemplate.afterPropertiesSet(); return redisTemplate; } }
二、邏輯代碼
1. 程序入口
package com.apollo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; /** * @author :apollo * @since :Created in 2019/2/22 */ @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
2. 實體類
實體類Animal如下:
package com.apollo.bean; /** * @author :apollo * @since :Created in 2019/2/22 */ public class Animal { private Integer weight; private Integer height; private String name; public Animal(Integer weight, Integer height, String name) { this.weight = weight; this.height = height; this.name = name; } ……這裡是get、set方法 }
3. 公共返回類
package com.apollo.common; /** * @author :apollo * @since :Created in 2019/2/22 */ public class ApiResult { public static final Integer STATUS_SUCCESS = 0; public static final Integer STATUS_FAILURE = -1; public static final String DESC_SUCCESS = "操作成功"; public static final String DESC_FAILURE = "操作失敗"; private Integer status; private String desc; private Object result; private ApiResult() {} private ApiResult(Integer status, String desc, Object result) { this.status = status; this.desc = desc; this.result = result; } //這個方法和Builder設計模式二選一即可,功能是重復的 public static ApiResult success(Object result) { return success(DESC_SUCCESS, result); } //同上 public static ApiResult success(String desc, Object result) { return new ApiResult(STATUS_SUCCESS, desc, result); } //同上 public static ApiResult failure(Integer status) { return failure(status, null); } //同上 public static ApiResult failure(Integer status, String desc) { return failure(status, desc, null); } //同上 public static ApiResult failure(Integer status, String desc, Object result) { return new ApiResult(status, desc, result); } public static Builder builder() { return new Builder(); } //靜態內部類,這裡使用Builder設計模式 public static class Builder { private Integer status; private String desc; private Object result; public Builder status(Integer status) { this.status = status; return this; } public Builder desc(String desc) { this.desc = desc; return this; } public Builder result(Object result) { this.result = result; return this; } public ApiResult build() { return new ApiResult(status, desc, result); } } ……這裡是get、set方法,這裡的方法一定不能少,否則返回時無法將對象序列化 }
4. 請求處理Controller
RedisController類如下:
package com.apollo.controller; import com.apollo.bean.Animal; import com.apollo.common.ApiResult; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.web.bind.annotation.*; import java.util.HashMap; import java.util.Map; /** * @author :apollo * @since :Created in 2019/2/22 */ @RestController @RequestMapping(value = "/redis") public class RedisController { @Autowired private RedisTemplate<String, Object> redisTemplate; /** * 測試向redis中添加數據 * @param id * @return */ @GetMapping(value = "/{id}") public ApiResult addData2Redis(@PathVariable("id") Integer id) { redisTemplate.opsForValue().set("first", id); redisTemplate.opsForValue().set("second", "hello world"); redisTemplate.opsForValue().set("third", new Animal(100, 200, "二狗子")); return ApiResult.builder() .status(ApiResult.STATUS_SUCCESS) .desc("添加成功") .build(); } /** * 測試從redis中獲取數據 * @return */ @GetMapping("/redis-data") public ApiResult getRedisData() { Map<String, Object> result = new HashMap<>(); result.put("first", redisTemplate.opsForValue().get("first")); result.put("second", redisTemplate.opsForValue().get("second")); result.put("third", redisTemplate.opsForValue().get("third")); return ApiResult.builder() .status(ApiResult.STATUS_SUCCESS) .desc("獲取成功") .result(result) .build(); } }
註意:這裡是返回ApiResult對象,需要將返回的對象序列化,所以ApiResult中的get/set方法是必須的,否則會報錯:HttpMessageNotWritableException: No converter found for return value of type: class com.apollo.common.ApiResult,找不到ApiResult類型的轉換器。
三、測試
1. 測試添加
使用postman請求http://localhost:11011/api/v1/redis/5,返回結果:
{ "status": 0, "desc": "添加成功", "result": null }
登錄到redis,使用命令dbsize查看存儲的數據量:
數據量為3,對應我們上邊程序中的3步操作。
2. 測試獲取
使用postman請求http://localhost:11011/api/v1/redis/redis-data,返回結果:
{ "status": 0, "desc": "獲取成功", "result": { "third": { "weight": 100, "height": 200, "name": "二狗子" }, "first": 5, "second": "hello world" } }
與我們之前存入的數據對比,是正確的。
四、代碼地址
github地址:https://github.com/myturn0/redis-test.git
到此這篇關於Springboot項目中使用redis的配置詳解的文章就介紹到這瞭,更多相關Springboot redis配置內容請搜索WalkonNet以前的文章或繼續瀏覽下面的相關文章希望大傢以後多多支持WalkonNet!
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