本篇文章主要实现SpringBoot中使用hikariCP;
一 、使用工具
1. JDK1.8
2. springToolSuit(STS)
3. maven
二、创建项目
1.首先创建一个SpringBoot项目,勾选web,mysql等具体怎样创建可以参考我的上两个博客;传送门
2.maven 依赖如下:
1)Java 8 maven artifact:
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
2)Java 7 maven artifact:
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP-java7</artifactId>
<version>2.4.11</version>
<scope>compile</scope>
</dependency>
我的maven依赖为:
<dependencies>
<!-- spring aop -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<!-- spring data jpa -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- hibernate 依赖 -->
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<!-- JDBC连接数据库,因为要用HikariCP,所以需要将SpringBoot中的tomcat-jdbc排除 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<exclusions>
<exclusion>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jdbc</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- HikariCP 连接池依赖,从父依赖获取额版本 -->
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<!-- <scope>runtime</scope> -->
</dependency>
<!-- 因为配置了thymeleaf 模板,可以将此注释
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> -->
<!-- thymeleaf 模板 默认包含spring-boot-starter-web-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- 连接mysql数据库驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- spring boot 内置tomcat -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<[email protected]注解-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<!-- net json 这个必须配置jdk的版本号 -->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
<!-- LEGACYhtml5需要搭配一个额外的库NekoHTML才可用,解决严格的html验证问题 -->
<dependency>
<groupId>net.sourceforge.nekohtml</groupId>
<artifactId>nekohtml</artifactId>
</dependency>
<!-- 单元测试相关依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
SpringBoot父依赖如下:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
这里需要注意的是,因为用了最新的SpringBoot版本,HikarICP从SpringBoot继承版本,所以JDK需要配置为1.8,如果不是将会出现错误,错误原因将会在下面展示。
3.数据库连接配置文件如下(我将数据库连接配置单独写在了一个配置文件,这样找起来比较清晰,文件名为 datasource.properties ,后面的配置类中要用到此名字):
#第一个数据源(多数据源将会在后面介绍,primary表示为第一个数据源)
spring.datasource.primary.dataSourceClassName=com.mysql.jdbc.jdbc2.optional.MysqlDataSource
spring.datasource.primary.dataSourceProperties.serverName=localhost
spring.datasource.primary.dataSourceProperties.portNumber=3306
spring.datasource.primary.dataSourceProperties.databaseName=newrecruit
spring.datasource.primary.username=root
spring.datasource.primary.password=yourpassword
# 下面为连接池的补充设置,应用到上面所有数据源中
#自动提交
spring.datasource.default-auto-commit=true
#指定updates是否自动提交
spring.datasource.auto-commit=true
spring.jpa.show-sql = true
spring.datasource.maximum-pool-size=100
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5
spring.datasource.validation-query=SELECT 1
spring.datasource.test-on-borrow=false
spring.datasource.test-while-idle=true
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
spring.datasource.time-between-eviction-runs-millis=18800
# 配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto=update
#spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy
#spring.jpa.database=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
数据库配置文件写好以后,开始写配置类 :
package com.zlc.config;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.PropertySource;
/**
* <p>Company: </p>
* @Description:
* @Create Date: 2017年8月13日下午11:59:49
* @Version: V1.00
* @Author: 追到乌云的尽头找太阳
*/
@Configuration
@PropertySource("classpath:datasource.properties")
public class DataSourceConfig {
private Logger logger = LoggerFactory.getLogger(DataSourceConfig.class);
@Bean(name = "primaryDataSource")
@Primary
@Qualifier("primaryDataSource")
@ConfigurationProperties(prefix="spring.datasource.primary" )
public DataSource primaryDataSource() {
logger.info("数据库连接池创建中.......");
return DataSourceBuilder.create().build();
}
}
一个@PropertySource(“classpath:datasource.properties”)注解,就可以免去我们自己写读取配置文件的麻烦
第一个数据源的配置类如下:
package com.zlc.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
import java.util.Map;
/**
* <p>Company: 信息技术研究所 </p>
* @Description: 第一个数据源的配置类
* @Create Date: 2017年5月11日下午9:22:12
* @Version: V1.00
* @Author: 追到乌云的尽头找太阳
*/
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactoryPrimary",
transactionManagerRef="transactionManagerPrimary",
basePackages= { "com.zlc.dao" }) //设置Repository所在位置
public class PrimaryDataSouceConfig {
@Autowired @Qualifier("primaryDataSource")
private DataSource primaryDataSource;
@Primary
@Bean(name = "entityManagerPrimary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Primary
@Bean(name = "entityManagerFactoryPrimary")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {
return builder
.dataSource(primaryDataSource)
.properties(getVendorProperties(primaryDataSource))
.packages("com.zlc.entity") //设置实体类所在位置
.persistenceUnit("primaryPersistenceUnit")
.build();
}
@Autowired
private JpaProperties jpaProperties;
private Map<String, String> getVendorProperties(DataSource dataSource) {
return jpaProperties.getHibernateProperties(dataSource);
}
@Primary
@Bean(name = "transactionManagerPrimary")
public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}
上面有连个需要注意的地方,一个是JPA所在的包名: basePackages= { “com.b505.dao” }) //设置Repository所在位置,一定不能写错,一个JPA实体类所在的位置: .packages(“com.b505.entity”) //设置实体类所在位置。
我们在main方法中我们可以检查一下(一定要注意SpringBoot项目的结构,因为SpringBoot是自动扫描并注册类注册到Spring的上下文中所以main所在的类的包名一定是最大的,这样用其他注解的类才能正常注册,我的项目结构如下):
如果你的controller写在了com.zlca.web;那么项目编译不会产生错误,但是此web层的映射全都不能用,因为没有注册到Spring中。SpringBoot是扫描@SpringBootApplication下的类以及此注解的子文件夹下的类;
main方法如下:
package com.zlc;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import com.zaxxer.hikari.HikariDataSource;
/**
* <p>Company: 信息技术研究所 </p>
* @Description: 程序的入口
* @Create Date: 2017年9月14日下午1:11:05
* @Version: V1.00
* @Author: 追到乌云的尽头找太阳
*/
@SpringBootApplication
public class RecruitmentApp {
public static void main(String[] args) {
ApplicationContext applicationContext = SpringApplication.run(
RecruitmentApp.class, args);
DataSource dataSource = applicationContext.getBean(DataSource.class);
System.out.println("datasource is :" + dataSource);
//检查数据库是否是hikar数据库连接池
if (!(dataSource instanceof HikariDataSource)) {
System.err.println(" Wrong datasource type :"
+ dataSource.getClass().getCanonicalName());
System.exit(-1);
}
try {
Connection connection = dataSource.getConnection();
ResultSet rs = connection.createStatement()
.executeQuery("SELECT 1");
if (rs.first()) {
System.out.println("Connection OK!");
} else {
System.out.println("Something is wrong");
}
// connection.close();
// System.exit(0);
} catch (SQLException e) {
System.out.println("FAILED");
e.printStackTrace();
System.exit(-2);
// TODO: handle exception
}
}
}
以上参看了别人的博客,在此谢过,如有侵权,请联系作者([email protected])删除
好了,HIkariCP已经配置好了,启动main;
完工;这里需要注意的一点,如果是用jdk1.7,则会出现如下错误:
这个就是本博客一开始中说的jdk版本和Hikari的版本要对应上。此错误只需要将JDK换成1.8即可。