springboot(七)redis 实现session共享

1、引入jar包


			org.springframework.boot
			spring-boot-starter-redis
		
		
			org.springframework.session
			spring-session-data-redis
		

2、在resources下创建redis.properties文件

# REDIS (RedisProperties)
# Redis数据库索引(默认为0)
spring.redis.database=0
spring.redis.host=localhost
spring.redis.password=
spring.redis.port=6379
spring.redis.timeout=300
spring.redis.maxIdle=8
spring.redis.minIdle=0
spring.redis.maxActive=8
spring.redis.maxWait=-1
#spring.redis.sentinel.master= # name of Redis server
#spring.redis.sentinel.nodes= # comma-separated list of host:port pairs


3、创建RedisConfig,添加@EnableRedisHttpSession来开启spring session支持

package com.demo.redis;

import com.demo.model.Redis;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
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.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

import java.lang.reflect.Method;

/**
 * Created by huguoju on 2016/12/29.
 * 缓存管理(注解用)
 */
@Configuration
@EnableCaching
@EnableRedisHttpSession  //开启spring session支持  实现session共享
public class RedisConfig extends CachingConfigurerSupport {
    @Autowired
    private Redis redis;

    private int expireTime = 60 * 60;
    /**
     * 生成key的策略
     * @return
     */
    @Bean
    public KeyGenerator keyGenerator() {
        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 JedisConnectionFactory redisConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setHostName(redis.getHost());
        factory.setPort(redis.getPort());
        factory.setTimeout(redis.getTimeout()); //设置连接超时时间
        return factory;
    }
    @Bean
    public CacheManager cacheManager(RedisTemplate redisTemplate) {
        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        //Number of seconds before expiration. Defaults to unlimited (0)
        cacheManager.setDefaultExpiration(expireTime); //设置key-value超时时间
        return cacheManager;
        //return new RedisCacheManager(redisTemplate);
    }
    @SuppressWarnings("unchecked")
    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        setSerializer(template); //设置序列化工具,这样ReportBean不需要实现Serializable接口
        template.afterPropertiesSet();
        return template;
    }
    private void setSerializer(StringRedisTemplate template) {
        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);
    }
}

如果redis配置信息是放在application.properties里,可以直接用

@Value("${spring.redis.host}")
private String host;
 
  
直接注入属性,我是将redis配置放在redis.properties里了,所以不能用@value了,
创建redis文件
 
  
 
  
package com.demo.model;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

/**
 * Created by huguoju on 2016/12/29.
 */
@Configuration
@Data
@ConfigurationProperties(prefix = "spring.redis",locations = "classpath:redis/redis.properties")
public class Redis {

    private String database;
    private String host;
    private String password;
    private int port;
    private int timeout;
    private String maxIdle;
    private String minIdle;
    private String maxActive;
    private String maxWait;


}

在redisConfig里通过
      @Autowired
    private Redis redis;
调用就可以了。
4、测试,在testController中,
 
  
package com.demo.controller;

import com.demo.model.User;
import com.demo.service.TestService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by huguoju on 2016/12/28.
 */
@RestController
@RequestMapping("test")
@Api(value = "测试类",tags = "测试接口")
public class TestController {

    /**
     * @Cacheable(key = "'user:'.concat(#userCode)",value = "user")
     * value的意思是当调用这个方法的时候,会从一个名叫 user 的缓存中查询,如果没有,则执行实际的方法(即查询数据库),并将执行的结果存入缓存中,否则返回缓存中的对象
     */
    @Autowired
    private TestService testService;
    @RequestMapping(value = "testData",produces = MediaType.APPLICATION_JSON_UTF8_VALUE,method = {RequestMethod.POST,RequestMethod.GET})
    @ApiOperation("测试读写分离、缓存")
    @Cacheable(key = "'user:'.concat(#userCode)",value = "user")
    public User testDateSource(
            @ApiParam(name = "userCode",value = "用户id",required = true)
            @RequestParam Integer userCode){
        User user=testService.selectByUserCode(userCode);
        return user;
    }
}

@Cacheable 的作用 主要针对方法配置,能够根据方法的请求参数对其结果进行缓存

@Cacheable 作用和配置方法

参数 解释 example
value 缓存的名称,在 spring 配置文件中定义,必须指定至少一个 例如:
@Cacheable(value=”mycache”)
@Cacheable(value={”cache1”,”cache2”}
key 缓存的 key,可以为空,如果指定要按照 SpEL 表达式编写,如果不指定,则缺省按照方法的所有参数进行组合 @Cacheable(value=”testcache”,key=”#userName”)
condition 缓存的条件,可以为空,使用 SpEL 编写,返回 true 或者 false,只有为 true 才进行缓存 @Cacheable(value=”testcache”,condition=”#userName.length()>2”)
 
  
 
  
 
  
 
  
 
  

@CachePut 的作用 主要针对方法配置,能够根据方法的请求参数对其结果进行缓存,和 @Cacheable 不同的是,它每次都会触发真实方法的调用

@CachePut 作用和配置方法

参数 解释 example
value 缓存的名称,在 spring 配置文件中定义,必须指定至少一个 @CachePut(value=”my cache”)
key 缓存的 key,可以为空,如果指定要按照 SpEL 表达式编写,如果不指定,则缺省按照方法的所有参数进行组合 @CachePut(value=”testcache”,key=”#userName”)
condition 缓存的条件,可以为空,使用 SpEL 编写,返回 true 或者 false,只有为 true 才进行缓存 @CachePut(value=”testcache”,condition=”#userName.length()>2”)
 
  
 
  

@CacheEvict

@CachEvict 的作用 主要针对方法配置,能够根据一定的条件对缓存进行清空

@CacheEvict 作用和配置方法

参数 解释 example
value 缓存的名称,在 spring 配置文件中定义,必须指定至少一个 @CacheEvict(value=”my cache”)
key 缓存的 key,可以为空,如果指定要按照 SpEL 表达式编写,如果不指定,则缺省按照方法的所有参数进行组合 @CacheEvict(value=”testcache”,key=”#userName”)
condition 缓存的条件,可以为空,使用 SpEL 编写,返回 true 或者 false,只有为 true 才进行缓存 @CacheEvict(value=”testcache”,condition=”#userName.length()>2”)
allEntries 是否清空所有缓存内容,缺省为 false,如果指定为 true,则方法调用后将立即清空所有缓存 @CachEvict(value=”testcache”,allEntries=true)
beforeInvocation 是否在方法执行前就清空,缺省为 false,如果指定为 true,则在方法还没有执行的时候就清空缓存,缺省情况下,如果方法执行抛出异常,则不会清空缓存 @CachEvict(value=”testcache”,beforeInvocation=true)
@Caching:多个不同的需求放在同一个方法上,就用Caching,比如清除多个缓存
 
  
  
@Caching(evict = {
    @CacheEvict(value="test1", key="#id",beforeInvocation = true), 
        @CacheEvict(value="test2", key="#id",beforeInvocation = true)
})
 
  
Caching源代码如下:
 
  
ps:redisUtil:
 
  
 
  
package com.example.util;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;

import java.io.Serializable;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * Created by huguoju on 2016/12/30.
 */
@SuppressWarnings("unchecked")
@Component
public class RedisUtils {
    @SuppressWarnings("rawtypes")
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 批量删除对应的value
     *
     * @param keys
     */
    public void remove(final String... keys) {
        for (String key : keys) {
            remove(key);
        }
    }
    /**
     * 批量删除key
     *
     * @param pattern
     */
    public void removePattern(final String pattern) {
        Set keys = redisTemplate.keys(pattern);
        if (keys.size() > 0)
            redisTemplate.delete(keys);
    }
    /**
     * 删除对应的value
     *
     * @param key
     */
    public void remove(final String key) {
        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }
    /**
     * 判断缓存中是否有对应的value
     *
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return redisTemplate.hasKey(key);
    }
    /**
     * 读取缓存
     *
     * @param key
     * @return
     */
    public Object get(final String key) {
        Object result = null;
        ValueOperations operations = redisTemplate.opsForValue();
        result = operations.get(key);
        return result;
    }
    /**
     * 写入缓存
     *
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            ValueOperations operations = redisTemplate.opsForValue();
            operations.set(key, value);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 写入缓存
     *
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value, Long expireTime) {
        boolean result = false;
        try {
            ValueOperations operations = redisTemplate.opsForValue();
            operations.set(key, value);
            redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}






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