在springboot中使用（不整合mybatis）：
@Bean
public ServletRegistrationBean createRegistrationBean() {
ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/stat/*");
Map<String, String> initParams = new HashMap<String, String>();
initParams.put("loginUsername", "hurricane");
initParams.put("loginPassword", "1003");
bean.setInitParameters(initParams);
return bean;
}
@Bean(initMethod="init",destroyMethod="close")
public DruidDataSource createDataSource() throws SQLException {
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setUrl("jdbc:mysql://127.0.0.1:3306/temp");
druidDataSource.setUsername("root");
druidDataSource.setPassword("root");
// druidDataSource.setTimeBetweenLogStatsMillis(3000);
druidDataSource.setMaxActive(15);
druidDataSource.setInitialSize(5);
druidDataSource.setMaxWait(60000);
druidDataSource.setMinIdle(1);
druidDataSource.setFilters("stat");
druidDataSource.setConnectionProperties(""
+ "druid.stat.mergeSql=true;"
+ "druid.stat.slowSqlMillis=1;"
+ "druid.stat.logSlowSql=true");
return druidDataSource;
}
第一个bean是用来查看统计信息的页面展示，可不使用，第二个是数据源，在需要的地方注入即可使用。
package com.hurricane.app.file.server.dao;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.hurricane.app.file.server.entity.User;
@Repository
public class UserDao {
@Autowired
private DruidDataSource dataSource;
public User getUserById(int id) throws Exception{
DruidPooledConnection connection = dataSource.getConnection();
PreparedStatement prepareStatement = connection.prepareStatement("select * from user where id = ?");
prepareStatement.setInt(1, id);
ResultSet executeQuery = prepareStatement.executeQuery();
List<User> users = new ArrayList<User>();
while (executeQuery.next()) {
String username = executeQuery.getString("username");
String password = executeQuery.getString("password");
String desc = executeQuery.getString("description");
User user = new User();
user.setUsername(username);
user.setPassword(password);
users.add(user);
}
executeQuery.close();
if (users.size()>0) {
return users.get(0);
}
return null;
}
}
这种方式注入的数据源建立的连接会一直处于active状态，不知道怎么让连接池回收，解决方法待进一步学习。
springboot+mybatis+druid：
引入mybatis对springboot的支持依赖：
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency>
Dao层接口：
package com.hurricane.app.file.server.dao;
import org.apache.ibatis.annotations.Mapper;
import com.hurricane.app.file.server.entity.User;
@Mapper
public interface UserDao {
public User getUserById(int id);
}
映射文件src/main/resources/mapper/UserMapper.xml：
<?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="com.hurricane.app.file.server.dao.UserDao">
<select id="getUserById" resultType="com.hurricane.app.file.server.entity.User">
select * from user where id=#{id}
</select>
</mapper>
application.properties的内容为：
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource spring.datasource.url = jdbc:mysql://127.0.0.1:3306/temp?useUnicode=true&characterEncoding=utf-8 spring.datasource.username = root spring.datasource.password = root spring.datasource.driverClassName = com.mysql.jdbc.Driver # 连接池配置,下面配置说明请参考Druid Github Wiki，配置_DruidDataSource参考配置 spring.datasource.druid.initial-size=5 spring.datasource.druid.max-active=20 spring.datasource.druid.min-idle=5 spring.datasource.druid.max-wait=30000 spring.datasource.druid.pool-prepared-statements=true spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20 spring.datasource.druid.validation-query=SELECT 1 FROM DUAL spring.datasource.druid.validation-query-timeout=3000 spring.datasource.druid.test-on-borrow=false spring.datasource.druid.test-on-return=false spring.datasource.druid.test-while-idle=true spring.datasource.druid.time-between-eviction-runs-millis=6000 spring.datasource.druid.min-evictable-idle-time-millis=300000 spring.datasource.druid.max-evictable-idle-time-millis=600000 spring.datasource.druid.time-between-log-stats-millis=3000 # MyBatis 配置 mybatis.mapper-locations=classpath:mapper/*.xml
注意只是通过上面的properties文件，仅仅连接信息（url，username，password，driverClassName）可以正常传递到连接池，但是下面的通用配置无法传递到连接池，分别尝试了如下格式，均无法成功将属性注入：
spring.datasource.druid.max-active=20 spring.datasource.druid.maxActive=20 spring.datasource.maxActive=20 spring.datasource.max-active=20
参考druid官方提供的demo，将DruidDataSource进行一层封装，如下：
package com.hurricane.app.file.server.datasource;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import com.alibaba.druid.pool.DruidDataSource;
@ConfigurationProperties("spring.datasource.druid")
class DruidDataSourceWrapper extends DruidDataSource implements InitializingBean {
@Autowired
private DataSourceProperties basicProperties;
@Override
public void afterPropertiesSet() throws Exception {
//if not found prefix 'spring.datasource.druid' jdbc properties ,'spring.datasource' prefix jdbc properties will be used.
System.out.println("============afterPropertiesSet============");
System.out.println(getUsername()+"---"+getPassword()+"---"+getUrl()+"---"+getDriverClassName());
if (super.getUsername() == null) {
super.setUsername(basicProperties.determineUsername());
}
if (super.getPassword() == null) {
super.setPassword(basicProperties.determinePassword());
}
if (super.getUrl() == null) {
super.setUrl(basicProperties.determineUrl());
}
if(super.getDriverClassName() == null){
super.setDriverClassName(basicProperties.getDriverClassName());
}
}
}
之后将spring.properties的文件配置数据源类型指定为封装过后的数据源：
spring.datasource.type=com.hurricane.app.file.server.datasource.DruidDataSourceWrapper
这样，数据源的其他配置属性就可以正常注入使用了。
参考：
https://blog.csdn.net/u011244202/article/details/54709060（测试发现其中的数据源基本配置无法正常注入，解决方法见上面）
https://github.com/alibaba/druid/wiki/
http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/