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项目地址：https://gitee.com/indexman/spring_boot_in_action
下面就介绍一下如何使用spring boot自带的缓存。按步骤来操作即可，不懂的可以去看项目源码。
1.新建simple-cache模块，修改pom文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>spring_boot_in_action</artifactId>
<groupId>com.laoxu</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.laoxu</groupId>
<artifactId>simple-cache</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>simple-cache</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.配置application.yml文件
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
username: root
password: root123
url: jdbc:mysql://localhost:3306/spring_cache?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT&useSSL=false
mybatis:
configuration:
map-underscore-to-camel-case: true
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
debug: true
#redis
3.创建数据库spring_cache，并执行sql
/*
Navicat MySQL Data Transfer
Source Server : 本地
Source Server Version : 50528
Source Host : 127.0.0.1:3306
Source Database : springboot_cache
Target Server Type : MYSQL
Target Server Version : 50528
File Encoding : 65001
Date: 2018-04-27 14:54:04
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for department
-- ----------------------------
DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`department_name` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Table structure for employee
-- ----------------------------
DROP TABLE IF EXISTS `employee`;
CREATE TABLE `employee` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`last_name` varchar(255) DEFAULT NULL,
`email` varchar(255) DEFAULT NULL,
`gender` int(2) DEFAULT NULL,
`d_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
4.创建实体
package com.laoxu.springboot.bean;
public class Department {
private Integer id;
private String departmentName;
public Department() {
super();
// TODO Auto-generated constructor stub
}
public Department(Integer id, String departmentName) {
super();
this.id = id;
this.departmentName = departmentName;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getDepartmentName() {
return departmentName;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
@Override
public String toString() {
return "Department [id=" + id + ", departmentName=" + departmentName + "]";
}
}
package com.laoxu.springboot.bean;
public class Employee {
private Integer id;
private String lastName;
private String email;
private Integer gender; //性别 1男 0女
private Integer dId;
public Employee() {
super();
}
public Employee(Integer id, String lastName, String email, Integer gender, Integer dId) {
super();
this.id = id;
this.lastName = lastName;
this.email = email;
this.gender = gender;
this.dId = dId;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer getGender() {
return gender;
}
public void setGender(Integer gender) {
this.gender = gender;
}
public Integer getdId() {
return dId;
}
public void setdId(Integer dId) {
this.dId = dId;
}
@Override
public String toString() {
return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", dId="
+ dId + "]";
}
}
5.创建mapper
package com.laoxu.springboot.mapper;
import com.laoxu.springboot.bean.Employee;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Repository;
@Repository
@Mapper
public interface EmployeeMapper {
@Select("SELECT * FROM employee WHERE id=#{id}")
Employee getEmpById(Integer id);
@Update("update employee set last_name=#{lastName}, email=#{email},gender=#{gender},d_id=#{dId} where id=#{id}")
void updateEmp(Employee employee);
@Delete("delete from employee where id=#{id}")
void deleteEmpById(Integer id);
@Insert("insert into employee(last_name,email,gender,d_id) values(#{lastName}, #{email}, #{gender}, #{dId})")
void insertEmp(Employee employee);
@Select("SELECT * FROM employee WHERE last_name=#{lastName}")
Employee getEmpByLastName(String lastName);
}
6.创建service
package com.laoxu.springboot.service;
import com.laoxu.springboot.bean.Employee;
import com.laoxu.springboot.mapper.EmployeeMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.*;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
@CacheConfig(cacheNames = "emp") //在此处加上就不用在每个方法上加了
@Service
public class EmployeeService {
@Autowired
EmployeeMapper employeeMapper;
@Cacheable(/*cacheNames = "emp"*//*,keyGenerator = "myKeyGenerator",key = "#id", condition = "#a0>1" , unless = "#a0==1"*/)
public Employee getEmp(Integer id){
System.out.println("查询"+id+"号员工");
return employeeMapper.getEmpById(id);
}
/**
* 在方法后調用， 同步更新缓存
* @param employee
* @return
*/
@CachePut(/*cacheNames = "emp",*/ key="#result.id")
public Employee updateEmp(Employee employee){
System.out.println("更新员工："+employee);
employeeMapper.updateEmp(employee);
return employee;
}
/**
* allEntries = true 删除所有emp缓存
* beforeInvocation = true 无论方法是否成功 都会删掉缓存
* @param id
*/
@CacheEvict(/*value = "emp",*/ key = "#id")
public void deleteEmp(Integer id){
System.out.println("删除员工："+id);
}
@Caching(
cacheable = {
@Cacheable(/*value = "emp",*/ key = "#lastName")
},
put = {
@CachePut(/*value = "emp",*/ key = "#result.id"),
@CachePut(/*value = "email",*/ key = "#result.email")
}
)
public Employee getEmpByLastName(String lastName){
return employeeMapper.getEmpByLastName(lastName);
}
}
7.创建controller
package com.laoxu.springboot.controller;
import com.laoxu.springboot.bean.Employee;
import com.laoxu.springboot.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class EmployeeController {
@Autowired
EmployeeService employeeService;
@GetMapping("/emp/{id}")
public Employee getEmp(@PathVariable("id") Integer id){
return employeeService.getEmp(id);
}
@GetMapping("/emp")
public Employee update(Employee employee)
{
employeeService.updateEmp(employee);
return employee;
}
@GetMapping("/delEmp/{id}")
public String delete(@PathVariable("id") Integer id){
employeeService.deleteEmp(id);
return "success";
}
@GetMapping("/emp/lastName/{lastName}")
public Employee getEmpByLastName(@PathVariable("lastName") String lastName){
return employeeService.getEmpByLastName(lastName);
}
}
8.修改启动类
package com.laoxu.springboot;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@MapperScan("com.laoxu.springboot.mapper")
@EnableCaching//启用缓存
@SpringBootApplication
public class SimpleCacheApplication {
public static void main(String[] args) {
SpringApplication.run(SimpleCacheApplication.class, args);
}
}
9.创建自定义key生成器
package com.laoxu.springboot.config;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.lang.reflect.Method;
import java.util.Arrays;
@Configuration
public class MyCacheConfig {
@Bean("myKeyGenerator")
public KeyGenerator keyGenerator(){
return new KeyGenerator() {
@Override
public Object generate(Object o, Method method, Object... objects) {
String key=method.getName()+"["+ Arrays.asList(objects).toString()+"]";
return key;
}
};
}
}
10.反复执行以下测试路径，观察console的日志输出
查看resources文件夹下的readme.txt文件。、
#查询
http://localhost:8080/emp/1
http://localhost:8080/emp/2
#更新
http://localhost:8080/emp?id=1&lastName=%E5%BC%A0%E4%B8%892&[email protected]&gender=1&dId=1
#删除
http://localhost:8080/delEmp/1
#测试更新
http://localhost:8080/emp?id=1&lastName=%E5%BC%A0%E4%B8%891&[email protected]&gender=1&dId=1