1.springboot 整合 ehcache

1.1  引入pom依賴

<!-- caching -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache</artifactId>
</dependency>
 

1.2  新增配置檔案 ehcache.xml

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
    <cache name="depts"
    	   eternal="false"
           maxEntriesLocalHeap="200"
           timeToLiveSeconds="3600">
    </cache>
</ehcache>
 

1.3  在 springboot 的核心配置檔案 application.properties 檔案裡新增 ehcache 配置資訊

spring.cache.ehcache.config=classpath:ehcache.xml

 1.4  開啟快取

在啟動類上加 @EnableCaching 註解啟動快取，也可以加在 快取配置類上

package com.ahav;

import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@MapperScan("com.ahav.dao")//掃描 mybatis 包
@EnableCaching
public class ReserveApplication {
    private static final Logger logger = LoggerFactory.getLogger(ReserveApplication.class);

	public static void main(String[] args) {
		SpringApplication.run(ReserveApplication.class, args);
		logger.info("======================啟動完成=====================");
	}

	@Autowired
	private RestTemplateBuilder builder;
	// 使用
	// RestTemplateBuilder來例項化RestTemplate物件，spring預設已經注入了RestTemplateBuilder例項
	@Bean
	public RestTemplate restTemplate() {
		return builder.build();
	}

}
 

 1.5  在需要快取的方法上加註釋即可使用快取

@Override
@Cacheable(value = "depts")
public SystemResult viewDeptsAndUsers() {
    List<DeptStructure> deptStructure = new ArrayList<>();
    // 查詢父級部門，即parentId為null的部門
    deptDao.selectParentDepts().forEach(parent -> deptStructure.add(new DeptStructure(parent)));

    deptStructure.forEach(ds -> packagingDepts(ds));

    return new SystemResult(HttpStatus.OK.value(), "組織架構檢視", deptStructure);
}