1.在pom.xml中导入架包及jdbc架包
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
2.定义配置文件(这里的文件时properties格式的,可以放到任意位置)
druid.properties
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/db1?serverTimezone=Asia/Shanghai
username=root
password=root
#初始化连接数量
initialSize=5
#最大连接数
maxActive=10
#最大等待时间
maxWait=3000
3.测试,需要先加载配置文件
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.util.Properties;
public class DruidDemo {
public static void main(String[] args) throws Exception {
//1.加载配置文件
Properties pro = new Properties();
InputStream is = DruidDemo.class.getClassLoader().getResourceAsStream("druid.properties");
pro.load(is);
//2.获取连接池对象
DataSource ds = DruidDataSourceFactory.createDataSource(pro);
//3.获取连接
Connection conn = ds.getConnection();
System.out.println(conn);
}
}
4.结果:出现如下图即成功
5.简化步骤,将一些操作封装到一个工具类中
JDBCUtils.java
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/*
Druid连接池的工具类
*/
public class JDBCUtils {
//1.定义成员变量 DataSource
private static DataSource ds;
static {
//1.加载配置文件
Properties pro = new Properties();
try {
pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
//获取DataSource
ds = DruidDataSourceFactory.createDataSource(pro);
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
//获取连接
public static Connection getConnection() throws SQLException {
return ds.getConnection();
}
//释放资源
public static void close(Statement stmt,Connection conn){
if (stmt!=null) {
try {
stmt.close();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
if (conn!=null){
try {
conn.close();//归还连接
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
public static void close(ResultSet rs, Statement stmt, Connection conn){
if (rs!=null) {
try {
rs.close();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
if (stmt!=null) {
try {
stmt.close();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
if (conn!=null){
try {
conn.close();//归还连接
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
//获取连接池
public static DataSource getDataSource(){
return ds;
}
}
测试工具类:DruidTest.java
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
//测试工具类
public class DruidTest {
public static void main(String[] args) throws SQLException {
//给dept表添加一条记录
//1.获取连接
Connection conn = JDBCUtils.getConnection();
//2.定义sql
String sql = "insert into dept values(?,?,?)";
//3.获取邮差对象
PreparedStatement ps = conn.prepareStatement(sql);
//4.给?赋值
ps.setInt(1,50);
ps.setString(2,"HAHAHAH");
ps.setString(3,"CHINA");
//5.执行sql
ps.executeUpdate();
}
}
结果:插入成功