SpringBoot集成Redis做缓存处理

Spring Boot集成Redis教程

最新推荐文章于 2024-12-04 21:52:21 发布

weixin_30788239

最新推荐文章于 2024-12-04 21:52:21 发布

阅读量96

点赞数

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/mituxiaogaoyang/p/8393471.html

本文详细介绍了如何在Spring Boot项目中集成Redis缓存服务，包括引入依赖、配置属性、编写配置类、创建缓存服务接口及其实现，最后展示了如何在Controller中使用这些服务。

（1）首先，在springboot项目pom.xml中引入redis依赖

<dependency>
　　<groupId>redis.clients</groupId>
　　<artifactId>jedis</artifactId>
　　<version>2.9.0</version>
</dependency>
<dependency>
　　<groupId>org.springframework.boot</groupId>
　　<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

（2）将redis需要的配置写入application.properties中方便修改时不改动代码

# Redis数据库索引（默认为0）
spring.redis.database=0
# Redis服务器地址
spring.redis.host=127.0.0.1
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码（默认为空）
spring.redis.password=
# 连接池最大连接数（使用负值表示没有限制）
spring.redis.pool.max-active=8
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.pool.max-wait=-1
# 连接池中的最大空闲连接
spring.redis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.pool.min-idle=0
# 连接超时时间（毫秒）
spring.redis.timeout=0
# 设置key失效时间（秒）
spring.redis.expire=600

（3）在springboot中注册Redis配置，在启动时执行该配置

RedisConfig.java(放在springboot能扫描到的包下)

package com.zxyp.redis;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;

import redis.clients.jedis.JedisPoolConfig;

@Configuration
public class RedisConfig {
	@Value("${spring.redis.host}")
	private String hostname;
	@Value("${spring.redis.password}")
	private String password;
	@Value("${spring.redis.port}")
	private Integer port;
	@Value("${spring.redis.database}")
	private Integer database;
	@Bean
	@ConfigurationProperties(prefix = "spring.redis")
	public JedisPoolConfig getRedisConfig() {
		JedisPoolConfig config = new JedisPoolConfig();
		return config;
	}

	@Bean
	@ConfigurationProperties(prefix = "spring.redis")
	public JedisConnectionFactory getConnectionFactory(){
		JedisConnectionFactory factory = new JedisConnectionFactory();
		JedisPoolConfig config = getRedisConfig();
		factory.setPoolConfig(config);
		factory.setHostName(hostname);
		factory.setPassword(password);
		factory.setPort(port);
		factory.setDatabase(database);
		System.out.println("JedisConnectionFactory bean init success.");
		return factory;
	}

	@Bean
	public RedisTemplate<?, ?> getRedisTemplate() {
		RedisTemplate<?, ?> template = new StringRedisTemplate(getConnectionFactory());
		return template;
	}
}

（4）根据需求写对应的redis缓存服务接口，我这里写了get取缓存，set存缓存，expire给缓存设置对应的失效时间，flushall清空所有缓存，delete清空对应key的缓存

RedisDao.java (service层接口)

package com.zxyp.redis;

public interface RedisDao {
	public void set(String key,String value);
	
	public String get(String key);
	
	public void delete(String key);

	public void expire(String key, Long value);

	void flushall();
}

（5）实现Service层RedisDao接口

RedisDaoImpl.java

package com.zxyp.redis.impl;

import javax.annotation.Resource;

import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.stereotype.Repository;

import com.zxyp.redis.RedisDao;


@Repository("springdatadao")
public class SpringDataRedisDaoImpl implements RedisDao {

	@Resource
	private RedisTemplate<String, String> redisTemplate;

	@Override
	public void set(String key, String value) {
		redisTemplate.execute(new RedisCallback<Boolean>() {
			@Override
			public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
				RedisSerializer<String> serializer = redisTemplate.getStringSerializer();
				connection.set(serializer.serialize(key), serializer.serialize(value));
				return true;
			}
		});

	}

	@Override
	public String get(String key) {
		try {
			String result = redisTemplate.execute(new RedisCallback<String>() {
				@Override
				public String doInRedis(RedisConnection connection) throws DataAccessException {
					RedisSerializer<String> serializer = redisTemplate.getStringSerializer();
					byte[] value = connection.get(serializer.serialize(key));
					return serializer.deserialize(value);
				}
			});
			return result;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "destory";
	}

	@Override
	public void delete(String key) {
		redisTemplate.execute(new RedisCallback<Object>() {
			@Override
			public Object doInRedis(RedisConnection connection) throws DataAccessException {
				connection.del(key.getBytes());
				return null;
			}
		});
	}
	
	@Override
	public void expire(String key, Long value) {
		redisTemplate.execute(new RedisCallback<Boolean>() {
			@Override
			public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
				RedisSerializer<String> serializer = redisTemplate.getStringSerializer();
				connection.expire(serializer.serialize(key), value);
				return true;
			}
		});

	}
	
	@Override
	public void flushall() {
		redisTemplate.execute(new RedisCallback<Object>() {
			@Override
			public Object doInRedis(RedisConnection connection) throws DataAccessException {
				connection.flushAll();
				return null;
			}
		});
	}

}

说明：get之所以要检测异常，是因为redis服务可能会挂掉，如果服务挂掉可以通过返回值判断，并作出处理，不会影响业务

（6）Redis服务的使用，在对应需要调用服务的Controller中注入该Service层接口，调用对应的方法即可，这里是我使用的示例，仅供参考

ContenController.java (此Controller引用了自己项目封装的pager，不能直接使用，只是作为使用redis的参考)

package com.zxyp.controller;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.alibaba.fastjson.JSON;
import com.zxyp.ContentService;
import com.zxyp.UserService;
import com.zxyp.base.web.BaseController;
import com.zxyp.base.web.ResultEntity;
import com.zxyp.dao.entity.Pager;
import com.zxyp.domain.Govtheme;
import com.zxyp.redis.RedisDao;

@RestController
@SuppressWarnings("rawtypes") 
@RequestMapping("/shareContent")
public class ContenController {

	@Autowired
	private ContentService contentService;
	@Autowired
	private UserService userService;
	
	@Resource
	@Qualifier("springdatadao")
	private RedisDao redisDao;
	
	@Value("${spring.redis.expire}")
	private Long expiretime;
    /**
     * 查询部门列表内容
     * @return
     */
    @RequestMapping(value = "/shareDepartPager",method= RequestMethod.POST)
    public ResultEntity queryDepartContentPager(@RequestBody Map map){
    	
    	int pageSize = Integer.parseInt(map.get("pageSize")+"");
    	int currentPage = Integer.parseInt(map.get("currentPage")+"");
    	String type = map.get("type")+"";
    	String userid = map.get("userid")+"";
    	String fileid = (String)map.get("fileid");
    	String id = String.valueOf(map.get("id"));
    	String redisKey = String.valueOf(currentPage)+String.valueOf(pageSize)+type+userid+fileid+id;
    	Pager pager = null;
    	String pageStr = redisDao.get(redisKey);
    	if(!"destory".equals(pageStr)) {
    		if(pageStr != null) {
    			pager = JSON.parseObject(pageStr,Pager.class);
    		} else {
    			pager = new Pager();
    	    	pager.setPageSize(pageSize);
    	    	pager.setCurrentPage(currentPage);
    			pager = contentService.querySharePager(map, pager);
    			redisDao.set(redisKey, JSON.toJSONString(pager));
    			redisDao.expire(redisKey, expiretime);
    		}
		} else {
			pager = new Pager();
	    	pager.setPageSize(pageSize);
	    	pager.setCurrentPage(currentPage);
			pager = contentService.querySharePager(map, pager);
		}
		
    	return ResultEntity.createSuccessInstance(pager);
    }
}

转载于:https://www.cnblogs.com/mituxiaogaoyang/p/8393471.html