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本文将会介绍SpringBoot集成Mybatis，主要关注DataSource的配置
然后引入Druid数据库连接池，最后使用Zookeeper实现数据源的动态配置
3.1.SpringBoot集成Mybatis
3.1.1.添加依赖包
添加项目依赖包；SpringBoot、Mybatis、Mysql连接等
<?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-boot-starter-parent</artifactId>
<groupId>org.springframework.boot</groupId>
<version>2.3.12.RELEASE</version>
<relativePath/>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>org.poiuy</groupId>
<version>1.0-SNAPSHOT</version>
<artifactId>springboot-datasource-mybatis</artifactId>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.3.12.RELEASE</version>
<exclusions>
<exclusion>
<artifactId>spring-boot-starter-logging</artifactId>
<groupId>org.springframework.boot</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-typehandlers-jsr310</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>2.3.11.RELEASE</version>
</dependency>
</dependencies>
</project>
3.1.2.添加SpringBoot配置文件
SpringBoot配置文件，添加datasource和mybatis的配置
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
username: root
password: xxx
url: jdbc:mysql://192.168.1.208:9906/poiuy_study?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: org.poiuy.springboot.datasource.mybatis.domain
3.1.3.添加Domain类
添加数据对象
public class MybatisUser {
private Integer userId;
@NotNull(message = "用户名不能为空")
private String username;
private String secure;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getSecure() {
return secure;
}
public void setSecure(String secure) {
this.secure = secure;
}
}
3.1.4.添加Mapper
mapper接口中添加一个查询用户方法
@Mapper
public interface MybatisUserMapper {
MybatisUser selectByUsername(@Param("username") String username);
}
对应的xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.poiuy.springboot.datasource.mybatis.dao.MybatisUserMapper">
<resultMap id="BaseResultMap" type="org.poiuy.springboot.datasource.mybatis.domain.MybatisUser">
<id property="userId" column="user_id" jdbcType="INTEGER"/>
<result property="username" column="username" jdbcType="VARCHAR"/>
<result property="secure" column="secure" jdbcType="VARCHAR"/>
</resultMap>
<!--MybatisUserMapper select(@Param("name") String name);-->
<select id="selectByUsername" resultMap="BaseResultMap">
SELECT user_id,username FROM mybatis_user WHERE username = #{username}
</select>
</mapper>
3.1.5.Service接口
service接口直接调用mapper方法
@Service("mybatisUserService")
public class MybatisUserServiceImpl implements MybatisUserService {
private final MybatisUserMapper mybatisUserMapper;
@Autowired
public MybatisUserServiceImpl(MybatisUserMapper mybatisUserMapper) {
this.mybatisUserMapper = mybatisUserMapper;
}
@Override
public MybatisUser getUserByUsername(String username) {
return mybatisUserMapper.selectByUsername(username);
}
}
3.1.6.Controller控制器
user控制器
@RestController
@RequestMapping("/user")
public class UserController {
private final Logger logger = LogManager.getLogger(getClass());
private final MybatisUserService mybatisUserService;
@Autowired
public UserController(MybatisUserService mybatisUserService){
this.mybatisUserService = mybatisUserService;
}
@PostMapping
public R getByUsername(@RequestBody @Valid MybatisUser mybatisUser){
String username = mybatisUser.getUsername();
logger.debug("获取到参数：{}",username);
MybatisUser dbUser = mybatisUserService.getUserByUsername(username);
return R.ok().put("data",dbUser);
}
}
3.1.7.测试
运行SpringBoot程序，在PostMan中调用请求
3.2.增加Druid连接池
3.2.1.添加依赖包
添加Druid的依赖包
<?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-boot-starter-parent</artifactId>
<groupId>org.springframework.boot</groupId>
<version>2.3.12.RELEASE</version>
<relativePath/>
</parent>
<modelVersion>4.0.0</modelVersion>
<version>1.0-SNAPSHOT</version>
<groupId>org.poiuy</groupId>
<artifactId>springboot-datasource-druid</artifactId>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.3.12.RELEASE</version>
<exclusions>
<exclusion>
<artifactId>spring-boot-starter-logging</artifactId>
<groupId>org.springframework.boot</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>2.4.0</version>
</dependency>
</dependencies>
</project>
3.2.2.修改SpringBoot配置文件
SpringBoot配置文件，删除原来的Datasource配置，并增加Druid
Druid分为基础配置、监控配置和连接池参数配置。可根据需要进行配置
spring:
datasource:
# 切换数据源
type: com.alibaba.druid.pool.DruidDataSource
druid:
# Druid基础配置 ， 与DataSource配置等同的效果
username: root
password: xxx
url: jdbc:mysql://192.168.1.208:9906/poiuy_study?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
driver-class-name: com.mysql.cj.jdbc.Driver
# Druid监控
filter:
stat:
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: false
wall:
config:
multi-statement-allow: true
web-stat-filter:
enabled: true
url-pattern: /*
exclusions: /druid/*,*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico
session-stat-enable: true
session-stat-max-count: 10
principal-session-name: session_name
principal-cookie-name: cookie_name
profile-enable:
stat-view-servlet:
enabled: true
url-pattern: /druid/*
reset-enable: false
login-username: poiuy
login-password: 123456
allow: 127.0.0.1,192.168.1.111
deny:
aop-patterns:
#连接池配置
name: testDruidDataSource
initial-size: 10
max-active: 20
min-idle: 10
max-wait: 60000
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
validation-query: SELECT 1 FROM DUAL
validation-query-timeout: 3000
test-on-borrow: false
test-on-return: false
test-while-idle: true
time-between-eviction-runs-millis: 5000
min-evictable-idle-time-millis: 5000
max-evictable-idle-time-millis: 5000
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: org.poiuy.springboot.datasource.mybatis.domain
3.2.3.测试
运行SpringBoot程序，在PostMan中调用请求
另外如果配置了Druid监控配置项，那么在浏览器输入http://localhost:8080/druid/index.html
可以进入Druid的监控界面
3.3.Zookeeper实现数据源的动态配置
3.3.1.添加依赖包
在pom.xml中新增curator依赖包
<?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-boot-starter-parent</artifactId>
<groupId>org.springframework.boot</groupId>
<version>2.3.12.RELEASE</version>
<relativePath/>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>org.poiuy</groupId>
<version>1.0-SNAPSHOT</version>
<artifactId>springboot-datasource-dynamic</artifactId>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.3.12.RELEASE</version>
<exclusions>
<exclusion>
<artifactId>spring-boot-starter-logging</artifactId>
<groupId>org.springframework.boot</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.11.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>2.3.12.RELEASE</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.8</version>
</dependency>
</dependencies>
</project>
3.3.2.SpringBoot配置文件
修改SpringBoot配置文件，将Druid的基础配置进行注释，并添加Zookeeper配置项
spring:
datasource:
# 切换数据源
type: com.alibaba.druid.pool.DruidDataSource
druid:
# Druid基础配置 ， 与DataSource配置等同的效果
# username: root
# password: xxx
# url: jdbc:mysql://192.168.1.208:9906/poiuy_study?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
# driver-class-name: com.mysql.cj.jdbc.Driver
# Druid监控
filter:
stat:
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: false
wall:
config:
multi-statement-allow: true
web-stat-filter:
enabled: true
url-pattern: /*
exclusions: /druid/*,*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico
session-stat-enable: true
session-stat-max-count: 10
principal-session-name: session_name
principal-cookie-name: cookie_name
profile-enable:
stat-view-servlet:
enabled: true
url-pattern: /druid/*
reset-enable: false
login-username: poiuy
login-password: 123456
allow: 127.0.0.1,192.168.1.111
deny:
aop-patterns:
#连接池配置
name: testDruidDataSource
initial-size: 10
max-active: 20
min-idle: 10
max-wait: 60000
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
validation-query: SELECT 1 FROM DUAL
validation-query-timeout: 3000
test-on-borrow: false
test-on-return: false
test-while-idle: true
time-between-eviction-runs-millis: 5000
min-evictable-idle-time-millis: 5000
max-evictable-idle-time-millis: 5000
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: org.poiuy.springboot.datasource.mybatis.domain
zookeeper:
connectString: 192.168.1.208:2181
connectionTimeoutMs: 5000
maxRetries: 3
baseSleepTimeMs: 1000
listenerPath: /zookeeper/datasource
3.3.3.集成Zookeeper
创建ZookeeperConfig，将CuratorFramework注入到Spring中，用来操作Zookeeper
@Configuration
public class ZookeeperConfig {
@Value("${zookeeper.connectString}")
private String connectString;
@Value("${zookeeper.connectionTimeoutMs}")
private Integer connectionTimeoutMs;
@Value("${zookeeper.maxRetries}")
private Integer maxRetries;
@Value("${zookeeper.baseSleepTimeMs}")
private Integer baseSleepTimeMs;
private CuratorFramework client;
@PostConstruct
public void init(){
client = CuratorFrameworkFactory.builder()
.connectString(connectString)
.connectionTimeoutMs(connectionTimeoutMs)
.retryPolicy(new ExponentialBackoffRetry(baseSleepTimeMs, maxRetries))
.build();
//连接
client.start();
}
@Bean
public CuratorFramework curatorFramework(){
return this.client;
}
}
3.3.4.定义DataSource配置
此时需要重新构建DruidDataSource对象，在生成dataSource时从zookeeper中获取配置信息，并赋值到DataSource
这里只写了基本的4个参数，注意此时需要将Spring配置文件中相同的属性删除，否则会被Spring配置文件中的值覆盖掉
@Configuration
public class DruidConfig {
private final Logger logger = LogManager.getLogger(getClass());
@Resource
private CuratorFramework curatorFramework;
@Value("${zookeeper.listenerPath}")
private String datasourceParh;
@ConfigurationProperties(prefix = "spring.datasource.druid")
@Bean
public DataSource dataSource(){
DruidDataSource druidDataSource = new DruidDataSource();
try {
byte[] datasourceData = curatorFramework.getData().forPath(datasourceParh);
String datasourceJson = new String(datasourceData);
logger.debug("获取到zookeeper的数据：{}",datasourceJson);
Gson gson = new GsonBuilder().serializeNulls().create();
ZookeeperDataSource zookeeperDataSource = gson.fromJson(datasourceJson,ZookeeperDataSource.class);
if(zookeeperDataSource == null) {
return druidDataSource;
}
druidDataSource.setUrl(zookeeperDataSource.getUrl());
druidDataSource.setUsername(zookeeperDataSource.getUsername());
druidDataSource.setPassword(zookeeperDataSource.getPassword());
druidDataSource.setDriverClassName(zookeeperDataSource.getDriver());
} catch (Exception e) {
e.printStackTrace();
}
return druidDataSource;
}
}
Zookeeper上配置的数据源信息，直接存储了json数据
此时启动项目，在PostMan中调用接口测试
虽然SpringBoot的配置文件中没有配置数据源基本信息，但程序依旧运行正常
3.3.5.动态修改数据源
添加Zookeeper监听器，当数据节点的值发生变化时重新启动DataSource并设置修改后的值
@Component
public class ZookeeperListener {
private static Logger logger = LogManager.getLogger(ZookeeperListener.class);
@Value("${zookeeper.listenerPath}")
private String listenerPath;
@Resource
private CuratorFramework client;
@Resource
private DruidDataSource dataSource;
@PostConstruct
public void start() throws Exception {
//创建监听
PathChildrenCache cache = new PathChildrenCache(client, "/zookeeper",true);
cache.start();
cache.rebuild();
cache.getListenable().addListener((CuratorFramework curatorFramework, PathChildrenCacheEvent pathChildrenCacheEvent) -> {
PathChildrenCacheEvent.Type type = pathChildrenCacheEvent.getType();
ChildData data = pathChildrenCacheEvent.getData();
List<ChildData> initialData = pathChildrenCacheEvent.getInitialData();
logger.debug("节点发生变化,type = {} data = {} initialData = {}",type,data,initialData);
if(data != null && listenerPath.equals(data.getPath())) {
byte[] datasourceData = data.getData();
String datasourceJson = new String(datasourceData);
logger.debug("获取到zookeeper的数据：{}",datasourceJson);
Gson gson = new GsonBuilder().serializeNulls().create();
ZookeeperDataSource zookeeperDataSource = gson.fromJson(datasourceJson,ZookeeperDataSource.class);
if(zookeeperDataSource != null) {
dataSource.restart();
dataSource.setUrl(zookeeperDataSource.getUrl());
dataSource.setUsername(zookeeperDataSource.getUsername());
dataSource.setPassword(zookeeperDataSource.getPassword());
dataSource.setDriverClassName(zookeeperDataSource.getDriver());
}
}
});
}
}
这里为了测试，新建了一个数据库，测试动态数据库的变更
重新启动程序，调用接口，程序运行正常（注意此时返回的id为1）
然后通过Zookeeper客户端修改datasource的值（此处仅修改了database）
set /zookeeper/datasource {"username":"xxx","password":"xxx","url":"jdbc:mysql://192.168.1.208:9906/poiuy_study_bak?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai","driver":"com.mysql.cj.jdbc.Driver"}
在程序后台console中可以看到Zookeeper监听到数据变化后重新获取数据源配置并重启DruidDataSource
此时再次调用接口可以看到获取的值是更换后的数据库的数据
Tags：druid参数配置
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