ssm整合redis和mysql_SSM 整合Redis缓存数据库 + RedisTemplate对象的使用，Spring Cache注解的使用 (第三章)...

SSM项目架构搭建

该图是一个搭建好了的SSM项目结构，用maven管理项目依赖。

一，添加项目依赖(我直接贴pom.xml文件了)

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4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

5 4.0.0

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7 indi.lwc

8 Spring_Redis_Demo

9 1.0-SNAPSHOT

10 war

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12 Spring_Redis_Demo Maven Webapp

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14 http://www.example.com

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17 4.3.7.RELEASE

18 UTF-8

19 1.7

20 1.7

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27 junit

28 junit

29 4.12

30 test

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35 mysql

36 mysql-connector-java

37 5.1.37

38 runtime

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43 org.mybatis

44 mybatis

45 3.4.2

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48 org.mybatis

49 mybatis-spring

50 1.3.1

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55 taglibs

56 standard

57 1.1.2

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60 jstl

61 jstl

62 1.2

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65 com.fasterxml.jackson.core

66 jackson-databind

67 2.8.7

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70 javax.servlet

71 javax.servlet-api

72 3.1.0

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78 org.springframework

79 spring-core

80 ${spring.version}

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83 org.springframework

84 spring-beans

85 ${spring.version}

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88 org.springframework

89 spring-context

90 ${spring.version}

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94 org.springframework

95 spring-jdbc

96 ${spring.version}

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99 org.springframework

100 spring-tx

101 ${spring.version}

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105 org.springframework

106 spring-web

107 ${spring.version}

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110 org.springframework

111 spring-webmvc

112 ${spring.version}

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116 org.springframework

117 spring-test

118 ${spring.version}

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123 commons-collections

124 commons-collections

125 3.2

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128 net.coobird

129 thumbnailator

130 0.4.8

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133 com.github.penggle

134 kaptcha

135 2.3.2

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138 commons-fileupload

139 commons-fileupload

140 1.3.2

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143 net.sf.json-lib

144 json-lib

145 2.4

146 jdk15

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149 commons-collections

150 commons-collections

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153 commons-lang

154 commons-lang

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157 commons-logging

158 commons-logging

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163 com.thoughtworks.xstream

164 xstream

165 1.4.9

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168 org.apache.taglibs

169 taglibs-standard-spec

170 1.2.1

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173 org.apache.taglibs

174 taglibs-standard-impl

175 1.2.1

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178 org.dom4j

179 dom4j

180 2.0.0

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185 c3p0

186 c3p0

187 0.9.1.2

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192 redis.clients

193 jedis

194 2.9.0

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197 org.springframework.data

198 spring-data-redis

199 1.6.2.RELEASE

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203 org.mybatis

204 mybatis-ehcache

205 1.0.0

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212 Spring_Redis_Demo

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217 maven-clean-plugin

218 3.1.0

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222 maven-resources-plugin

223 3.0.2

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227 maven-compiler-plugin

228 3.8.0

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230 1.7

231 1.7

232 UTF-8

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237 maven-surefire-plugin

238 2.22.1

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242 maven-war-plugin

243 3.2.2

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247 maven-install-plugin

248 2.5.2

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252 maven-deploy-plugin

253 2.8.2

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二，相关配置文件(对照上面的项目结构图，放在对应的Folder)

1.jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.dirverUrl=jdbc:mysql://localhost:3306/test

jdbc.user=root

jdbc.password=123456

#初始连接大小

druid.initialSize=5

#最大连接数

druid.maxActive=100

#最小空闲数

druid.minIdle=5

#最大等待时间，单位为ms

druid.manWait=60000

2.redis.properties

#服务器ip

redis.hostname=127.0.0.1

#redis数据库端口

redis.port=6379

#使用的数据库(共有16个数据库 0~15)

redis.database=2

#控制一个pool可分配多少个jedis实例，

redis.pool.maxActive=50

#控制一个pool最多有多少个状态为idle的jedis实例；

redis.pool.maxIdle=300

#最大等待连接时间(单位毫秒)

redis.pool.maxTotal=600

#redis密码(一般不设密码,设了重启服务也会没有)

redis.pass=

3.spring.web.xml (控制层配置文件，springmvc)。

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3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"

4 xmlns:mvc="http://www.springframework.org/schema/mvc"

5 xsi:schemaLocation="http://www.springframework.org/schema/beans6 http://www.springframework.org/schema/beans/spring-beans.xsd7 http://www.springframework.org/schema/context8 http://www.springframework.org/schema/context/spring-context.xsd9 http://www.springframework.org/schema/mvc10 http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

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45 text/html;charset=UTF-8

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4.spring-dao.xml (持久层dao层配置文件，mybatis)

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3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4 xmlns:context="http://www.springframework.org/schema/context"

5 xmlns:tx="http://www.springframework.org/schema/tx"

6 xsi:schemaLocation="http://www.springframework.org/schema/beans7 http://www.springframework.org/schema/beans/spring-beans.xsd8 http://www.springframework.org/schema/context9 http://www.springframework.org/schema/context/spring-context.xsd10 http://www.springframework.org/schema/tx11 http://www.springframework.org/schema/tx/spring-tx.xsd">

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5.spring-service.xml (服务层配置文件，处理逻辑，减少耦合层)。

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3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4 xmlns:context="http://www.springframework.org/schema/context"

5 xmlns:tx="http://www.springframework.org/schema/tx"

6 xsi:schemaLocation="http://www.springframework.org/schema/beans7 http://www.springframework.org/schema/beans/spring-beans.xsd8 http://www.springframework.org/schema/context9 http://www.springframework.org/schema/context/spring-context.xsd10 http://www.springframework.org/schema/tx11 http://www.springframework.org/schema/tx/spring-tx.xsd">

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18 class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

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6.spring-redis.xml (配置redis相关类，如RedisTemplate，JedisPoolConfig等)

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2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"

3 xsi:schemaLocation="http://www.springframework.org/schema/beans4 http://www.springframework.org/schema/beans/spring-beans-3.2.xsd5 http://www.springframework.org/schema/context6 http://www.springframework.org/schema/context/spring-context-3.2.xsd">

7 redis相关类 spring托管

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7.mybatis.xml (mybatis全局配置文件)

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2 "http://mybatis.org/dtd/mybatis-3-config.dtd">

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8.web.xml配置 (通常会自动生成,在webapp/web-inf下面)

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3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

5 version="4.0">

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7

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9 seckill-dispatcher

10 org.springframework.web.servlet.DispatcherServlet

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14 contextConfigLocation

15 classpath:spring/spring-*.xml

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20 seckill-dispatcher

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22 /

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三，需要的相关类文件(对照最上面的项目结构图，放在对应的包内)

1.RedisConfig.java (redis对象序列化类，你要存对象就必须配置。因为redis支持的数据类型只有 String,hash,List,Set,zset) 放在cache包下面。

1 packageindi.lwc.redis.cache;2

3 importcom.fasterxml.jackson.annotation.JsonAutoDetect;4 importcom.fasterxml.jackson.annotation.PropertyAccessor;5 importcom.fasterxml.jackson.databind.ObjectMapper;6 importorg.springframework.context.annotation.Bean;7 importorg.springframework.context.annotation.Configuration;8 importorg.springframework.data.redis.connection.RedisConnectionFactory;9 importorg.springframework.data.redis.core.RedisTemplate;10 importorg.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;11 importorg.springframework.data.redis.serializer.StringRedisSerializer;12

13 /**

14 * 如果我们想使用RedisTemplate存取对象,15 * 那我们只要设置对应的序列器就行了16 */

17 @Configuration18 public classRedisConfg {19

20 privateRedisConnectionFactory redisConnectionFactory;21

22

23 publicRedisConfg(RedisConnectionFactory redisConnectionFactory){24 this.redisConnectionFactory=redisConnectionFactory;25 }26 /**

27 * redisTemplate 序列化使用的jdkSerializeable, 存储二进制字节码, 所以自定义序列化类28 *29 *@return

30 */

31 @Bean32 public RedisTemplateredisTemplate() {33 RedisTemplate redisTemplate = new RedisTemplate<>();34 redisTemplate.setConnectionFactory(redisConnectionFactory);35

36 //使用Jackson2JsonRedisSerialize 替换默认序列化

37 Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);38

39 ObjectMapper objectMapper = newObjectMapper();40 objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);41 objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);42

43 jackson2JsonRedisSerializer.setObjectMapper(objectMapper);44

45 //设置value的序列化规则和 key的序列化规则

46 redisTemplate.setKeySerializer(newStringRedisSerializer());47 redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);48 redisTemplate.setHashKeySerializer(newStringRedisSerializer());49 redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);50 redisTemplate.afterPropertiesSet();51 returnredisTemplate;52 }53

54 }

2，Emp.java (实体类) 放在bean包下。

1 packageindi.lwc.redis.bean;2

3 importjava.io.Serializable;4 importjava.util.Date;5

6 public class Emp implementsSerializable {7 privateInteger eno;8 privateString ename;9 privateString esex;10 private floatsal;11 privateInteger dno;12 privateDate join_date;13 privateInteger elevel;14 privateString password;15

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17 publicInteger getEno() {18 returneno;19 }20

21 public voidsetEno(Integer eno) {22 this.eno =eno;23 }24

25 publicString getEname() {26 returnename;27 }28

29 public voidsetEname(String ename) {30 this.ename =ename;31 }32

33 publicString getEsex() {34 returnesex;35 }36

37 public voidsetEsex(String esex) {38 this.esex =esex;39 }40

41 public floatgetSal() {42 returnsal;43 }44

45 public void setSal(floatsal) {46 this.sal =sal;47 }48

49 publicInteger getDno() {50 returndno;51 }52

53 public voidsetDno(Integer dno) {54 this.dno =dno;55 }56

57 publicDate getJoin_date() {58 returnjoin_date;59 }60

61 public voidsetJoin_date(Date join_date) {62 this.join_date =join_date;63 }64

65 publicInteger getElevel() {66 returnelevel;67 }68

69 public voidsetElevel(Integer elevel) {70 this.elevel =elevel;71 }72

73 publicString getPassword() {74 returnpassword;75 }76

77 public voidsetPassword(String password) {78 this.password =password;79 }80

81 @Override82 publicString toString() {83 return "Emp{" +

84 "eno=" + eno +

85 ", ename='" + ename + '\'' +

86 ", esex='" + esex + '\'' +

87 ", sal=" + sal +

88 ", dno=" + dno +

89 ", join_date=" + join_date +

90 ", elevel=" + elevel +

91 ", password='" + password + '\'' +

92 '}';93 }94 }

3.EmpDao.interface  放在dao包下。

1 packageindi.lwc.redis.dao;2

3 importindi.lwc.redis.bean.Emp;4

5 public interfaceEmpDao {6

7

8 /**

9 * 根据id查询用户10 *@return

11 */

12 Emp queryEmpById(Integer eId);13

14 /**

15 * 更新员工16 *@paramemp17 *@return

18 */

19 intupdateEmp(Emp emp);20

21 /**

22 *删除指定id23 *@parameId24 *@return

25 */

26 intdeleteEmp(Integer eId);27

28 /**

29 * 添加员工30 *@paramemp31 *@return

32 */

33 intinsertEmp(Emp emp);34 }

4.EmpDao.xml  放在mapper包下

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2 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

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7 select * from emp where eno=#{eId}8

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10 update emp11

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13 ename=#{ename},14

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16 esex=#{esex},17

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19 sal=#{sal},20

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22 dno=#{dno},23

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25 join_date=#{join_date},26

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28 elevel=#{elevel},29

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31 password=#{password}32

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34 where eno=#{eno}35

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37 delete from emp where eno=#{eId}38

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41 select last_insert_id()42

43 insert into emp(ename,esex,sal,dno,join_date,elevel,password) VALUE44 (#{ename},#{esex},#{sal},#{dno},#{join_date},#{elevel},#{password})45

46

5.EmpService.Interface 放在sercie包下

1 packageindi.lwc.redis.service;2

3 importindi.lwc.redis.bean.Emp;4

5 public interfaceEmpService {6

7

8 /**

9 * 根据id查询emp10 *@parameId11 *@return

12 */

13 Emp findEmpById(inteId);14

15

16 /**

17 * 更新员工信息18 *@paramemp19 *@return

20 */

21 Emp replaceEmp(Emp emp);22

23 /**

24 * 删除员工信息25 *@parameId26 *@return

27 */

28 int removeEmp(inteId);29

30 /**

31 * 添加员工32 *@paramemp33 *@return

34 */

35 Emp addEmp(Emp emp);36 }

6.EmpServiceImpl.java  (逻辑处理类，redis的存取操作也在这个类)

1 packageindi.lwc.redis.service.impl;2

3 importindi.lwc.redis.bean.Emp;4 importindi.lwc.redis.dao.EmpDao;5 importindi.lwc.redis.service.EmpService;6 importindi.lwc.redis.util.RedisTemplateUtil;7 importorg.springframework.beans.factory.annotation.Autowired;8 importorg.springframework.cglib.beans.BeanMap;9 importorg.springframework.data.redis.core.HashOperations;10 importorg.springframework.data.redis.core.RedisTemplate;11 importorg.springframework.data.redis.core.ValueOperations;12 importorg.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;13 importorg.springframework.stereotype.Service;14

15

16 importjavax.annotation.Resource;17 importjava.io.ByteArrayOutputStream;18 importjava.io.IOException;19 importjava.io.ObjectOutputStream;20 importjava.util.HashMap;21 importjava.util.List;22 importjava.util.Map;23

24 @Service25 public class EmpServiceImpl implementsEmpService {26

27 @Resource28 privateEmpDao empDao;29

30 @Autowired31 privateRedisTemplate redisTemplate;32

33 @Override34 public Emp findEmpById(inteId) {35 ValueOperations valueOperations =redisTemplate.opsForValue();36 RedisTemplateUtil redisTemplateUtil =newRedisTemplateUtil(redisTemplate);37 //key

38 String empName ="emp_"+eId;39 Emp emp = null;40 if (redisTemplateUtil.get(empName)!=null && !"".equals(redisTemplateUtil.get(empName))){41 System.out.println("缓存中查询");42 //从缓存中取出

43 emp =(Emp) redisTemplateUtil.get(empName);44 }else{45 HashOperations hashOperations =redisTemplate.opsForHash();46 System.out.println("数据中查");47 emp =empDao.queryEmpById(eId);48 //存入缓存

49 redisTemplateUtil.set(empName,emp);50 }51

52 returnemp;53 }54

55 @Override56 publicEmp replaceEmp(Emp emp) {57 empDao.updateEmp(emp);58 returnemp;59 }60

61 @Override62 public int removeEmp(inteId) {63 returnempDao.deleteEmp(eId);64 }65

66 @Override67 publicEmp addEmp(Emp emp) {68 empDao.insertEmp(emp);69 returnemp;70 }71

72 /**

73 * 将对象属性转化为map结合74 */

75 public static MapbeanToMap(T bean) {76 Map map = new HashMap<>();77 if (bean != null) {78 BeanMap beanMap =BeanMap.create(bean);79 for(Object key : beanMap.keySet()) {80 map.put(key+"", beanMap.get(key));81 }82 }83 returnmap;84 }85

86

87 /**

88 * 将map集合中的数据转化为指定对象的同名属性中89 */

90 public static T mapToBean(Map map,Class clazz) throwsException {91 T bean =clazz.newInstance();92 BeanMap beanMap =BeanMap.create(bean);93 beanMap.putAll(map);94 returnbean;95 }96

97

98 }

7.RedisTemplateUtil.java (RedisTemplate各大成员内的api方法较多,所以我们通常将String，list,hash,set,zset 等数据类型的基本方法封装起来)

1 packageindi.lwc.redis.util;2

3 importorg.springframework.data.redis.core.RedisTemplate;4 importorg.springframework.data.redis.core.ValueOperations;5

6 importjava.util.List;7 importjava.util.Map;8 importjava.util.Set;9

10 public classRedisTemplateUtil {11

12 privateRedisTemplate redisTemplate;13

14 publicRedisTemplateUtil(RedisTemplate redisTemplate){15 this.redisTemplate =redisTemplate;16 }17

18 //将多种类型的值存入缓存

19 public voidset(String key, Object value){20 ValueOperations valueOperations =redisTemplate.opsForValue();21 valueOperations.set(key,value);22 }23

24 //获取指定的key值

25 publicObject get(String key){26 returnredisTemplate.opsForValue().get(key);27 }28

29 //将list存入缓存

30 public voidsetList(String key, List value){31 redisTemplate.opsForList().leftPush(key,value);32 }33

34 //获取指定key的list值

35 publicObject getList(String key){36 returnredisTemplate.opsForList().leftPop(key);37 }38

39 //将set存入缓存

40 public voidsetSet(String key, Set value){41 redisTemplate.opsForSet().add(key,value);42 }43

44 //获取set

45 publicObject getSet(String key){46 returnredisTemplate.opsForSet().members(key);47 }48

49 //将map存入缓存

50 public voidsetHash(String key , Map value){51 redisTemplate.opsForHash().putAll(key,value);52 }53

54 //获取map

55 publicObject getHash(String key){56 returnredisTemplate.opsForHash().entries(key);57 }58

59 //删除某个key

60 public voiddelete(String key){61 redisTemplate.delete(key);62 }63

64 }

8.BaseTest.java (启动配置)

1 packageindi.lwc.test;2

3 importorg.junit.runner.RunWith;4 importorg.springframework.test.context.ContextConfiguration;5 importorg.springframework.test.context.junit4.SpringJUnit4ClassRunner;6

7 @RunWith(SpringJUnit4ClassRunner.class)8 @ContextConfiguration(9 {"classpath:spring/spring-redis.xml",10 "classpath:spring/spring-service.xml",11 "classpath:spring/spring-dao.xml"})12 public classBaseTest {13

14

15 }

9.RedisTest.java (测试类)

1 packageindi.lwc.test;2

3 importindi.lwc.redis.bean.Emp;4 importindi.lwc.redis.service.EmpService;5 importorg.junit.Assert;6 importorg.junit.Test;7

8 importjavax.annotation.Resource;9

10 public class RedisTest extendsBaseTest {11

12 @Resource13 privateEmpService empService;14

15

16 @Test17 public voidtestFindEmpById(){18 Emp emp = empService.findEmpById(2);19 System.out.println(emp.toString());20 }21

22

23

24

25 }

Spring Cache注解

除了使用redisTemplate内置api实现缓存操作以外，我们还可以使用spring自带Cache注解来实现缓存操作。

缓存一般使用在服务层，在你想缓存的方法上添加相应的注解。下面介绍3个常用的注解。

@Cacheable

spring 会在其被调用后将返回值缓存起来，以保证下次利用同样的参数来执行该方法时可以直接从缓存中获取结果，而不需要再次执行该方法。

@CachePut

标注的方法在执行前不会去检查缓存中是否存在之前执行过的结果，而是每次都会执行该方法，并将执行结果以键值对的形式存入指定的缓存中。

@CacheEvict

用来标注在需要清除缓存元素的方法或类上的。