Pro JPA2读书笔记系列(十三)-第十一章(高级主题)-缓存-干货

Pro JPA2 第十一章(高级主题)-缓存-干货

额,这一章介绍下Spring-Data-JPA中EhCache的使用:

• 目录结构:

• pom.xml

  • cache的pom.xml

    <?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">  <parent>    <artifactId>spring-data</artifactId>    <groupId>spring-data</groupId>    <version>1.0-SNAPSHOT</version>  </parent>  <modelVersion>4.0.0</modelVersion>  <artifactId>cache</artifactId>  <dependencies>    <dependency>      <groupId>mysql</groupId>      <artifactId>mysql-connector-java</artifactId>      <version>5.1.36</version>    </dependency>    <dependency>      <groupId>com.alibaba</groupId>      <artifactId>druid</artifactId>      <version>1.0.15</version>    </dependency>    <dependency>      <groupId>net.sf.ehcache</groupId>      <artifactId>ehcache</artifactId>      <version>2.10.1</version>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-web</artifactId>    </dependency>  </dependencies></project>

  • spring-data的pom.xml

    <?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>  <groupId>spring-data</groupId>  <artifactId>spring-data</artifactId>  <packaging>pom</packaging>  <version>1.0-SNAPSHOT</version>  <modules>    <module>jpa</module>    <module>specification</module>    <module>rest</module>    <module>cache</module>  </modules>  <parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>1.4.0.M3</version>  </parent>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <java.version>1.8</java.version>    <querydsl.version>4.1.0</querydsl.version>  </properties>  <dependencies>    <dependency>      <groupId>org.projectlombok</groupId>      <artifactId>lombok</artifactId>      <scope>provided</scope>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-data-jpa</artifactId>      <exclusions>        <exclusion>          <groupId>org.apache.tomcat</groupId>          <artifactId>tomcat-jdbc</artifactId>        </exclusion>      </exclusions>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-devtools</artifactId>      <scope>provided</scope>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-test</artifactId>      <scope>test</scope>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-tomcat</artifactId>    </dependency>    <dependency>      <groupId>org.apache.tomcat.embed</groupId>      <artifactId>tomcat-embed-jasper</artifactId>      <scope>compile</scope>    </dependency>    <dependency>      <groupId>javax.servlet</groupId>      <artifactId>jstl</artifactId>      <scope>compile</scope>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-configuration-processor</artifactId>      <optional>true</optional>    </dependency>    <dependency>      <groupId>com.h2database</groupId>      <artifactId>h2</artifactId>      <scope>runtime</scope>    </dependency>    <dependency>      <groupId>org.apache.commons</groupId>      <artifactId>commons-lang3</artifactId>      <version>3.3.2</version>    </dependency>    <dependency>      <groupId>org.springframework.plugin</groupId>      <artifactId>spring-plugin-core</artifactId>      <version>1.2.0.RELEASE</version>    </dependency>  </dependencies>  <build>    <plugins>    <!-- 热部署 -->      <plugin>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-maven-plugin</artifactId>        <dependencies>          <dependency>            <groupId>org.springframework</groupId>            <artifactId>springloaded</artifactId>            <version>${spring-loaded.version}</version>          </dependency>        </dependencies>      </plugin>    </plugins>  </build>  <repositories>    <repository>      <id>spring-libs-snapshot</id>      <url>https://repo.spring.io/libs-snapshot</url>    </repository>  </repositories>  <pluginRepositories>    <pluginRepository>      <id>spring-libs-snapshot</id>      <url>https://repo.spring.io/libs-snapshot</url>    </pluginRepository>  </pluginRepositories></project>

  • Person实体类:

    package cache.entity;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;/** * Created by barton on 16-6-3. */@Entitypublic class Person {    @Id    @GeneratedValue    private Long id;    private String name;    private Integer age;    private String address;    public Person() {        super();    }    public Person(Long id, String name, Integer age, String address) {        super();        this.id = id;        this.name = name;        this.age = age;        this.address = address;    }    public Long getId() {        return id;    }    public void setId(Long id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }}   

  • repository:

    package cache.repository;import cache.entity.Person;import org.springframework.data.jpa.repository.JpaRepository;/** * Created by barton on 16-6-4. */public interface PersonRepository extends JpaRepository<Person,Long> {}

  • service

    package cache.service;import cache.entity.Person;/** * Created by barton on 16-6-4. */public interface DemoService {    Person save(Person person);    void remove(Long id);    Person findOne(Person person);}

  • service implements

    package cache.service.impl;import cache.entity.Person;import cache.repository.PersonRepository;import cache.service.DemoService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.annotation.CacheEvict;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;/** * Created by barton on 16-6-4. */@Servicepublic class DemoServiceImpl implements DemoService {    @Autowired    private PersonRepository repository;    @Override    @CachePut(value = "people", key = "#person.id")    public Person save(Person person) {        Person p = this.repository.save(person);        System.out.println("为id,key为:" + p.getId() + "数据做了缓存");        return p;    }    @Override    @CacheEvict(value = "people")    public void remove(Long id) {        System.out.println("删除了id,key为:" + id + "的数据缓存");        this.repository.delete(id);    }    @Override    @Cacheable(value = "people", key = "#person.id")    public Person findOne(Person person) {        Person person1 = this.repository.findOne(person.getId());        System.out.println("为id,key为:" + person1.getId() + "数据做了缓存");        return person1;    }}

  • run

    package cache;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cache.annotation.EnableCaching;/** * Created by barton on 16-6-3. */@SpringBootApplication@EnableCaching // 开启缓存支持public class CacheApplication implements CommandLineRunner {    public static void main(String[] args) {        SpringApplication.run(CacheApplication.class, args);    }    @Override    public void run(String... args) throws Exception {    }}

  • application.yml

    spring:  cache:    cache-names: peoplejpa:  hibernate:    ddl-auto: update  show-sql: truedatasource:  url: jdbc:mysql://localhost:3306/cache  username: root  password: root  driver-class-name: com.mysql.jdbc.Driver  # Number of ms to wait before throwing an exception if no connection is available.  max-wait: 10000  # Maximum number of active connections that can be allocated from this pool at the same time.  max-active: 50  # Validate the connection before borrowing it from the pool.  test-on-borrow: true