springboot和redis的結合使用
阿新 • • 發佈：2018-12-26
啟動jar包，pom.xml檔案新增依賴
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency>
application.properties中新增redis連線資訊
# Redis資料庫索引（預設為0） spring.redis.database=0 # Redis伺服器地址 spring.redis.host=127.0.0.1 # Redis伺服器連線埠 spring.redis.port=6379 # Redis伺服器連線密碼（預設為空） spring.redis.password= # 連線池最大連線數（使用負值表示沒有限制） spring.redis.pool.max-active=8 # 連線池最大阻塞等待時間（使用負值表示沒有限制） spring.redis.pool.max-wait=-1 # 連線池中的最大空閒連線 spring.redis.pool.max-idle=8 # 連線池中的最小空閒連線 spring.redis.pool.min-idle=3 # 連線超時時間（毫秒） spring.redis.timeout=100
application.properties
#spring.datasource.platform=mysql #spring.datasource.url=jdbc:mysql://localhost/mydb #spring.datasource.username=root #spring.datasource.password=hnqy #spring.datasource.driverClassName=com.mysql.jdbc.Driver logging.level.com.teng.springboot02.mapper=trace spring.datasource.platform=oracle spring.datasource.driverClassName=oracle.jdbc.driver.OracleDriver spring.datasource.url=jdbc:oracle:thin:@localhost:1521/orcl spring.datasource.username=jtf spring.datasource.password=123456 server.port=8080 server.session-timeout=30 server.tomcat.uri-encoding=UTF-8 #####springboot 整合 mybatis mybatis.mapper-locations= classpath:/com/teng/springboot02/mapper/*Mapper.xml #mybatis.config-location= classpath:/com/teng/springboot02/config/mybatis-config.xml #####定義別名 mybatis.type-aliases-package=com.teng.springboot02.domain ###Thymeleaf配置 spring.thymeleaf.prefix=classpath:/view/ spring.thymeleaf.suffix=.html spring.thymeleaf.cache=false spring.thymeleaf.encoding=UTF-8 spring.thymeleaf.mode=HTML5 ###過濾中文亂碼 spring.http.encoding.force=true spring.http.encoding.charset=UTF-8 spring.http.encoding.enabled=true # Redis資料庫索引（預設為0） spring.redis.database=0 # Redis伺服器地址 spring.redis.host=127.0.0.1 # Redis伺服器連線埠 spring.redis.port=6379 # Redis伺服器連線密碼（預設為空） #spring.redis.password=123456 # 連線池最大連線數（使用負值表示沒有限制） spring.redis.jedis.pool.max-idle=8
入口類Springboot01Application中新增@EnableCaching註解，開啟快取功能
@SpringBootApplication
@EnableCaching
public class Springboot02Application {
public static void main(String[] args) {
SpringApplication.run(Springboot02Application.class, args);
}
}
在Service類中要快取的方法上新增@Cacheable
TeacherServiceImpl
@Service
public class TeacherServiceImpl implements TeacherService {
@Resource
private TeacherMapper teacherMapper;
public List<Teacher> selectAllTeacher() {
return null;
}
//對當前方法中儲存的資料進行快取 value="TeacherList" 給key起名
@Cacheable(value = "TeacherList")
@Override
public List<Teacher> findAllTeacher() {
return teacherMapper.findAllTeacher();
}
//當執行該方法時，強制清空指定的快取
@CacheEvict(value = "TeacherList",allEntries = true)
@Override
public void deleteTeacher(int id) {
System.out.println("--------------------");
}
@Override
@Cacheable(value = "#tid",key="T(String).valueOf(#tid)")
public Teacher findTeacherById(int tid) {
Teacher teacher = teacherMapper.findTeacherById(tid);
return teacher;
}
//更新一個物件，在redis中清空一個物件
@Override
@CachePut(value = "#tid",key ="T(String).valueOf(#tid)")
public Teacher updateTeacher(@Param("tid")int tid,@Param("Teacher")Teacher teacher) {
teacherMapper.updateTeacher(teacher);
Teacher teacher1 = teacherMapper.findTeacherById(tid);
return teacher1;
}
public void setTeacherMapper(TeacherMapper teacherMapper) {
this.teacherMapper = teacherMapper;
}
}
TeacherService
package com.teng.springboot02.service;
import com.teng.springboot02.domain.Teacher;
import java.util.List;
public interface TeacherService {
public List<Teacher> selectAllTeacher();
public List<Teacher> findAllTeacher();
public void deleteTeacher(int id);
public Teacher findTeacherById(int id);
public Teacher updateTeacher(int tid,Teacher teacher);
}
controller
TeacherController
package com.teng.springboot02.controller;
import com.alibaba.fastjson.JSON;
import com.teng.springboot02.domain.Teacher;
import com.teng.springboot02.service.TeacherService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.List;
@RestController
public class TeacherController {
@Resource
private TeacherService teacherService;
@RequestMapping("/showTeacher")
public String showTeacher(){
List list1 = teacherService.findAllTeacher();
return JSON.toJSONString(list1);
}
@RequestMapping("/delete")
public String delete(int tid) {
teacherService.deleteTeacher(tid);
return "true";
}
@RequestMapping("/find")
public String find(int tid) {
Teacher teacher = teacherService.findTeacherById(tid);
return JSON.toJSONString(teacher);
}
@RequestMapping("/update")
public String update(Teacher teacher) {
teacherService.updateTeacher(teacher.getId(),teacher);
return "true";
}
public void setTeacherService(TeacherService teacherService) {
this.teacherService = teacherService;
}
}
domain
Stu
package com.teng.springboot02.domain;
public class Stu implements java.io.Serializable{
private Integer id;
private String name;
private Integer teacherId;
private String className;
private Teacher teacher;
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getTeacherId() {
return teacherId;
}
public void setTeacherId(Integer teacherId) {
this.teacherId = teacherId;
}
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
}
Teacher
package com.teng.springboot02.domain;
import sun.plugin2.message.Serializer;
import java.util.List;
public class Teacher implements java.io.Serializable{
private Integer id;
private String name;
private String className;
private List<Stu> stus;
public List<Stu> getStus() {
return stus;
}
public void setStus(List<Stu> stus) {
this.stus = stus;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
}
mapper
TeacherMapper
package com.teng.springboot02.mapper;
import com.teng.springboot02.domain.Teacher;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
import java.util.List;
@Mapper
@Component
public interface TeacherMapper {
public List<Teacher> selectAllTeacher();
public List<Teacher> findAllTeacher();
public Teacher findTeacherById(int id);
public int updateTeacher(Teacher teacher);
}
TeacherMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace 名稱空間 唯一的-->
<mapper namespace="com.teng.springboot02.mapper.TeacherMapper">
<!--一對多的第一種寫法，一般考慮到效能，不會這樣實現-->
<resultMap id="TeacherMap" type="Teacher" autoMapping="true">
<collection property="stus" ofType="Stu" column="id" autoMapping="true">
</collection>
</resultMap>
<!--查詢所有的老師及各自的所有學生,第一種形式 一一對應-->
<select id="selectAllTeacher" parameterType="Teacher" resultMap="TeacherMap">
select t.id,t.name,t.class_name,
s.id as sid,s.name as sname,s.class_name as className
from
teacher t join stu s
on t.id = s.teacher_id
</select>
<resultMap type="Teacher" id="teacherMaps" autoMapping="true">
<collection property="stus" ofType="Stu" select="getStudents" column="id">
</collection>
</resultMap>
<!-- 查詢所有的老師級各自的所有學生，一對多關聯-->
<select id="findAllTeacher" parameterType="Teacher" resultMap="teacherMaps">
SELECT
t.id,
t.name,
t.class_name
FROM
teacher t
</select>
<select id="getStudents" parameterType="int" resultType="Stu">
select
s.id,
s.name,
s.class_name as className
from stu s
where teacher_id = #{id}
</select>
<select id="findTeacherById" resultType="Teacher">
select * from teacher where id = #{tid}
</select>
<update id="updateTeacher" parameterType="Teacher">
update teacher set name=#{name} where id =#{id}
</update>
</mapper>
測試
清空控制檯
再次訪問，返回資料
控制檯沒有訪問資料庫，說明查詢時走的快取
強制清空指定的快取
控制檯輸出，說明執行方法成功
再次訪問showTeacher,控制檯輸出，說明沒訪問快取
