Spring Boot使用redis做数据缓存

程序员文章站 2022-03-10 15:18:26

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1 添加redis支持

在pom.xml中添加

  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-redis</artifactId>
        </dependency>

2 redis配置

package com.wisely.ij.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.lang.reflect.Method;


@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport{

    @Bean
    public KeyGenerator wiselyKeyGenerator(){
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... params) {
                StringBuilder sb = new StringBuilder();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : params) {
                    sb.append(obj.toString());
                }
                return sb.toString();
            }
        };

    }

    @Bean
    public CacheManager cacheManager(
            @SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {
        return new RedisCacheManager(redisTemplate);
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(
            RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }
}

3 redis服务器配置

# REDIS (RedisProperties)
spring.redis.database= # database name
spring.redis.host=localhost # server host
spring.redis.password= # server password
spring.redis.port=6379 # connection port
spring.redis.pool.max-idle=8 # pool settings ...
spring.redis.pool.min-idle=0
spring.redis.pool.max-active=8
spring.redis.pool.max-wait=-1
spring.redis.sentinel.master= # name of Redis server
spring.redis.sentinel.nodes= # comma-separated list of host:port pairs

4 应用

测试两个实体类

package com.wisely.ij.domain;


public class Address {
    private Long id;
    private String province;
    private String city;

    public Address(Long id,String province, String city) {
        this.id = id;
        this.province = province;
        this.city = city;
    }

    public Address() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}

package com.wisely.ij.domain;


public class User {
    private Long id;
    private String firstName;
    private String lastName;

    public User(Long id,String firstName, String lastName) {
        this.id = id ;
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public User() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

使用演示

package com.wisely.ij.service;

import com.wisely.ij.domain.Address;
import com.wisely.ij.domain.User;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

/**
 * Created by wisely on 2015/5/25.
 */
@Service
public class DemoService {
    @Cacheable(value = "usercache",keyGenerator = "wiselyKeyGenerator")
    public User findUser(Long id,String firstName,String lastName){
        System.out.println("无缓存的时候调用这里");
        return new User(id,firstName,lastName);
    }
    @Cacheable(value = "addresscache",keyGenerator = "wiselyKeyGenerator")
    public Address findAddress(Long id,String province,String city){
        System.out.println("无缓存的时候调用这里");
        return new Address(id,province,city);
    }
}

package com.wisely.ij.web;

import com.wisely.ij.domain.Address;
import com.wisely.ij.domain.User;
import com.wisely.ij.service.DemoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * Created by wisely on 2015/5/25.
 */

@Controller
public class DemoController {

    @Autowired
    DemoService demoService;

    @RequestMapping("/test")
    @ResponseBody
    public String putCache(){
        demoService.findUser(1l,"wang","yunfei");
        demoService.findAddress(1l,"anhui","hefei");
        System.out.println("若下面没出现“无缓存的时候调用”字样且能打印出数据表示测试成功");
        return "ok";
    }
    @RequestMapping("/test2")
    @ResponseBody
    public String testCache(){
        User user = demoService.findUser(1l,"wang","yunfei");
        Address address =demoService.findAddress(1l,"anhui","hefei");
        System.out.println("我这里没执行查询");
        System.out.println("user:"+"/"+user.getFirstName()+"/"+user.getLastName());
        System.out.println("address:"+"/"+address.getProvince()+"/"+address.getCity());
        return "ok";
    }
}