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:

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.
 */
@Entity
public 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.
 */
@Service
public 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: people
jpa:
  hibernate:
    ddl-auto: update
  show-sql: true
datasource:
  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

posted @ 2016-07-28 15:36 wang_jingj 阅读(223) 评论(0) 收藏举报

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Pro JPA2读书笔记系列(十三)-第十一章(高级主题)-缓存-干货

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