springmvc+mybatis+redis（转）

Posted 2020-07-30 沧海一滴

最近在学习redis的使用方法，它的本地使用方法比较简单，只需要先启动Redis服务器，然后运行测试代码即可。但是现在我想要在网站上访问数据库的时候采用Redis缓存，问题就出来了。要么是缓存直接失效，每次都是直接访问数据库，要么就是出错。在网上看了很久发现一个靠谱的方法，和大家分享一下。

redis相关类是采用注解的形式，因此首先扫描注解类

 

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1. <!-- class annotation related... start -->  
2.     <context:component-scan base-package="com.defonds.bdp.*.service" />  
3.     <context:component-scan base-package="com.defonds.bdp.cache.redis" />  
4.     <!-- class annotation related... end -->  
5.     <context:annotation-config />  

缓存工具类如下：

 

 

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1. /** 
2.  * File Name：RedisCacheConfig.java 
3.  * 
4.  * Copyright Defonds Corporation 2015  
5.  * All Rights Reserved 
6.  * 
7.  */  
8. package com.defonds.bdp.cache.redis;  
9.   
10. import org.springframework.cache.CacheManager;  
11. import org.springframework.cache.annotation.CachingConfigurerSupport;  
12. import org.springframework.cache.annotation.EnableCaching;  
13. import org.springframework.cache.interceptor.KeyGenerator;  
14. import org.springframework.context.annotation.Bean;  
15. import org.springframework.context.annotation.Configuration;  
16. import org.springframework.data.redis.cache.RedisCacheManager;  
17. import org.springframework.data.redis.connection.RedisConnectionFactory;  
18. import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;  
19. import org.springframework.data.redis.core.RedisTemplate;  
20.   
21. import java.lang.reflect.Method;  
22.   
23. /** 
24.  *  
25.  * Project Name：bdp  
26.  * Type Name：RedisCacheConfig  
27.  * Type Description： 
28.  *  Author：Defonds 
29.  * Create Date：2015-09-21 
30.  *  
31.  * @version 
32.  *  
33.  */  
34. @Configuration  
35. @EnableCaching  
36. public class RedisCacheConfig extends CachingConfigurerSupport {  
37.   
38.     @Bean  
39.     public JedisConnectionFactory redisConnectionFactory() {  
40.         JedisConnectionFactory redisConnectionFactory = new JedisConnectionFactory();  
41.   
42.         // Defaults  
43.         redisConnectionFactory.setHostName("127.0.0.1");  
44.         redisConnectionFactory.setPort(6379);  
45.         return redisConnectionFactory;  
46.     }  
47.   
48.     @Bean  
49.     public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory cf) {  
50.         RedisTemplate<String, String> redisTemplate = new RedisTemplate<String, String>();  
51.         redisTemplate.setConnectionFactory(cf);  
52.         return redisTemplate;  
53.     }  
54.   
55.     @Bean  
56.     public CacheManager cacheManager(RedisTemplate redisTemplate) {  
57.         RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);  
58.   
59.         // Number of seconds before expiration. Defaults to unlimited (0)  
60.         cacheManager.setDefaultExpiration(3000); // Sets the default expire time (in seconds)  
61.         return cacheManager;  
62.     }  
63.       
64.     @Bean  
65.     public KeyGenerator customKeyGenerator() {  
66.         return new KeyGenerator() {  
67.             public Object generate(Object o, Method method, Object... objects) {  
68.                 StringBuilder sb = new StringBuilder();  
69.                 sb.append(o.getClass().getName());  
70.                 sb.append(method.getName());  
71.                 for (Object obj : objects) {  
72.                     sb.append(obj.toString());  
73.                 }  
74.                 return sb.toString();  
75.             }  
76.         };  
77.     }  
78. }  

缓存的使用是在service层，在方法上使用注解，调用缓存

 

 

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1. /** 
2.  * File Name：CityService.java 
3.  * 
4.  * Copyright Defonds Corporation 2015  
5.  * All Rights Reserved 
6.  * 
7.  */  
8. package com.defonds.bdp.city.service;  
9.   
10. import java.util.List;  
11.   
12. import org.apache.commons.logging.Log;  
13. import org.apache.commons.logging.LogFactory;  
14. import org.springframework.beans.factory.annotation.Autowired;  
15. import org.springframework.cache.annotation.CacheEvict;  
16. import org.springframework.cache.annotation.Cacheable;  
17. import org.springframework.stereotype.Service;  
18. import org.springframework.transaction.annotation.Propagation;  
19. import org.springframework.transaction.annotation.Transactional;  
20.   
21. import com.defonds.bdp.city.bean.City;  
22. import com.defonds.bdp.city.mapper.CityMapper;  
23.   
24. /** 
25.  *  
26.  * Project Name：bdp 
27.  * Type Name：CityService 
28.  * Type Description： 
29.  * Author：Defonds 
30.  * Create Date：2015-08-31 
31.  * @version  
32.  *  
33.  */  
34. @Service  
35. @Transactional(propagation=Propagation.REQUIRED, rollbackFor=Exception.class)  
36. public class CityService {   
37.     private final Log logger = LogFactory.getLog(this.getClass());  
38.     @Autowired  
39.     private CityMapper cityMapper;  
40.       
41.     // C  
42.     @CacheEvict(value = { "provinceCities"}, allEntries = true)  
43.     public void insertCity(String city_code, String city_jb,   
44.             String province_code, String city_name,  
45.             String city, String province) {  
46.         City cityBean = new City();  
47.         cityBean.setCityCode(city_code);  
48.         cityBean.setCityJb(city_jb);  
49.         cityBean.setProvinceCode(province_code);  
50.         cityBean.setCityName(city_name);  
51.         cityBean.setCity(city);  
52.         cityBean.setProvince(province);  
53.         this.cityMapper.insertCity(cityBean);  
54.     }  
55.       
56.     // R  
57.     @Cacheable("provinceCities")  
58.     public List<City> provinceCities(String province) {  
59.         logger.debug("province=" + province);  
60.         return this.cityMapper.provinceCities(province);  
61.     }  
62.       
63.     // R  
64.     @Cacheable("searchCity")  
65.     public City searchCity(String city_code){  
66.         logger.debug("city_code=" + city_code);  
67.         return this.cityMapper.searchCity(city_code);     
68.     }  
69.       
70.     // U  
71.     @CacheEvict(value = { "provinceCities", "searchCity" }, allEntries = true)  
72.     public int renameCity(String city_code, String city_name) {  
73.         City city = new City();  
74.         city.setCityCode(city_code);  
75.         city.setCityName(city_name);  
76.         this.cityMapper.renameCity(city);  
77.         return 1;  
78.     }  
79.       
80.     // D  
81.     @CacheEvict(value = { "provinceCities", "searchCity" }, allEntries = true)  
82.     public int deleteCity(String city_code) {  
83.         this.cityMapper.deleteCity(city_code);  
84.         return 1;  
85.     }  
86. }  

 

 

maven项目，增加redis的jar包

 

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1. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
2.   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">  
3.   <modelVersion>4.0.0</modelVersion>  
4.   <groupId>com</groupId>  
5.   <artifactId>redisdemo01</artifactId>  
6.   <packaging>war</packaging>  
7.   <version>0.0.1-SNAPSHOT</version>  
8.   <name>redisdemo01 Maven Webapp</name>  
9.   <url>http://maven.apache.org</url>  
10.    
11.  <properties>  
12.         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
13.         <spring.version>4.1.4.RELEASE</spring.version>  
14.         <jackson.version>2.5.0</jackson.version>  
15.     </properties>  
16.   
17.     <dependencies>  
18.   
19.         <dependency>  
20.             <groupId>junit</groupId>  
21.             <artifactId>junit</artifactId>  
22.             <version>4.12</version>  
23.             <scope>test</scope>  
24.         </dependency>  
25.   
26.         <!-- spring -->  
27.         <dependency>  
28.             <groupId>org.springframework</groupId>  
29.             <artifactId>spring-core</artifactId>  
30.             <version>${spring.version}</version>  
31.         </dependency>  
32.   
33.         <dependency>  
34.             <groupId>org.springframework</groupId>  
35.             <artifactId>spring-beans</artifactId>  
36.             <version>${spring.version}</version>  
37.         </dependency>  
38.   
39.         <dependency>  
40.             <groupId>org.springframework</groupId>  
41.             <artifactId>spring-context</artifactId>  
42.             <version>${spring.version}</version>  
43.         </dependency>  
44.   
45.         <dependency>  
46.             <groupId>org.springframework</groupId>  
47.             <artifactId>spring-tx</artifactId>  
48.             <version>${spring.version}</version>  
49.         </dependency>  
50.   
51.         <dependency>  
52.             <groupId>org.springframework</groupId>  
53.             <artifactId>spring-web</artifactId>  
54.             <version>${spring.version}</version>  
55.         </dependency>  
56.   
57.         <dependency>  
58.             <groupId>org.springframework</groupId>  
59.             <artifactId>spring-webmvc</artifactId>  
60.             <version>${spring.version}</version>  
61.         </dependency>  
62.   
63.         <dependency>  
64.             <groupId>org.springframework</groupId>  
65.             <artifactId>spring-jdbc</artifactId>  
66.             <version>${spring.version}</version>  
67.         </dependency>  
68.   
69.         <dependency>  
70.             <groupId>org.springframework</groupId>  
71.             <artifactId>spring-test</artifactId>  
72.             <version>${spring.version}</version>  
73.             <scope>test</scope>  
74.         </dependency>  
75.   
76.         <!-- mybatis 包 -->  
77.         <dependency>  
78.             <groupId>org.mybatis</groupId>  
79.             <artifactId>mybatis</artifactId>  
80.             <version>3.2.8</version>  
81.         </dependency>  
82.   
83.         <!--mybatis spring 插件 -->  
84.         <dependency>  
85.             <groupId>org.mybatis</groupId>  
86.             <artifactId>mybatis-spring</artifactId>  
87.             <version>1.2.2</version>  
88.         </dependency>  
89.   
90.         <!-- mysql连接 -->  
91.         <dependency>  
92.             <groupId>mysql</groupId>  
93.             <artifactId>mysql-connector-java</artifactId>  
94.             <version>5.1.34</version>  
95.         </dependency>  
96.   
97.         <!-- 数据源 -->  
98.         <dependency>  
99.             <groupId>com.alibaba</groupId>  
100.             <artifactId>druid</artifactId>  
101.             <version>1.0.12</version>  
102.         </dependency>  
103.           
104.         <dependency>  
105.             <groupId>c3p0</groupId>  
106.             <artifactId>c3p0</artifactId>  
107.             <version>0.9.1.2</version>  
108.         </dependency>  
109.   
110.         <dependency>  
111.             <groupId>org.aspectj</groupId>  
112.             <artifactId>aspectjweaver</artifactId>  
113.             <version>1.8.4</version>  
114.         </dependency>  
115.   
116.         <!-- log4j -->  
117.         <dependency>  
118.             <groupId>log4j</groupId>  
119.             <artifactId>log4j</artifactId>  
120.             <version>1.2.17</version>  
121.         </dependency>  
122.   
123.         <!-- servlet -->  
124.         <dependency>  
125.             <groupId>javax.servlet</groupId>  
126.             <artifactId>servlet-api</artifactId>  
127.             <version>3.0-alpha-1</version>  
128.         </dependency>  
129.   
130.         <dependency>  
131.             <groupId>javax.servlet</groupId>  
132.             <artifactId>jstl</artifactId>  
133.             <version>1.2</version>  
134.         </dependency>  
135.   
136.         <!-- json -->  
137.         <dependency>  
138.             <groupId>org.codehaus.jackson</groupId>  
139.             <artifactId>jackson-mapper-asl</artifactId>  
140.             <version>1.9.13</version>  
141.         </dependency>  
142.   
143.         <dependency>  
144.             <groupId>com.alibaba</groupId>  
145.             <artifactId>fastjson</artifactId>  
146.             <version>1.2.3</version>  
147.         </dependency>  
148.   
149.         <dependency>  
150.             <groupId>com.fasterxml.jackson.core</groupId>  
151.             <artifactId>jackson-annotations</artifactId>  
152.             <version>${jackson.version}</version>  
153.         </dependency>  
154.   
155.         <dependency>  
156.             <groupId>com.fasterxml.jackson.core</groupId>  
157.             <artifactId>jackson-core</artifactId>  
158.             <version>${jackson.version}</version>  
159.         </dependency>  
160.   
161.         <dependency>  
162.             <groupId>com.fasterxml.jackson.core</groupId>  
163.             <artifactId>jackson-databind</artifactId>  
164.             <version>${jackson.version}</version>  
165.         </dependency>  
166.         <!-- 文件上传 -->  
167.         <dependency>  
168.             <groupId>commons-io</groupId>  
169.             <artifactId>commons-io</artifactId>  
170.             <version>2.4</version>  
171.         </dependency>  
172.   
173.         <dependency>  
174.             <groupId>commons-fileupload</groupId>  
175.             <artifactId>commons-fileupload</artifactId>  
176.             <version>1.2.2</version>  
177.         </dependency>  
178.       
179.         <!-- 队列 -->  
180.         <dependency>  
181.             <groupId>com.rabbitmq</groupId>  
182.             <artifactId>amqp-client</artifactId>  
183.             <version>3.4.1</version>  
184.     </dependency>  
185.     <dependency>  
186.             <groupId>org.slf4j</groupId>  
187.             <artifactId>slf4j-log4j12</artifactId>  
188.             <version>1.7.7</version>  
189.     </dependency>  
190.     <dependency>  
191.             <groupId>org.apache.commons</groupId>  
192.             <artifactId>commons-lang3</artifactId>  
193.