druid 数据库连接池 由阿里提供 步骤 1 导包 durid1.0.9 jar 包 2 定义配置文件 必须是 properties文件 名字任意 位置也任意 3 获得数据库连接池对象 通过 DuridDataSourceFactory获得 4 获取连接 具体代码如下 package Demo3Durid; 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 Demo3Durid { public static void main(String[] args) throws Exception { //加载文件 Properties pro=new Properties(); InputStream in = Demo3Durid.class.getClassLoader().getResourceAsStream("druid.properties"); pro.load(in); //获得连接池对象 通过 DuridDataSourceFactory获得 DataSource ds = DruidDataSourceFactory.createDataSource(pro); //获取连接 Connection conn = ds.getConnection(); System.out.println(conn); } }
利用工具类 实现 Druid连接池 package JdbcUtils; import com.alibaba.druid.pool.DruidDataSourceFactory; import javax.sql.DataSource; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.SQLException; import java.util.Properties; /* *Druid工具类 **/ public class JdbcUtils { //定义成员变量 DateSource private static DataSource ds; static{ //加载配置文件 try { Properties pro=new Properties(); InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("druid.properties"); pro.load(in); ds = DruidDataSourceFactory.createDataSource(pro); } catch (Exception e) { e.printStackTrace(); } } public static Connection getConnection() throws SQLException { return ds.getConnection(); } //释放资源 public static void close(AutoCloseable... c){ for(AutoCloseable a: c){ if(a!=null){ try { a.close(); } catch (Exception e) { e.printStackTrace(); } } } } } 连接 package JdbcUtils; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.SQLException; public class Demo4Druid { private static PreparedStatement ps; private static Connection conn; public static void main(String[] args) { //完成一个添加操作 try { //获得连接 conn = JdbcUtils.getConnection(); //定义sql语句 String sql="insert into coount values(null,?,?)"; //获得执行语句 ps = conn.prepareStatement(sql); //给?赋值 ps.setString(1,"李登"); ps.setDouble(2,20000); //执行sql int i = ps.executeUpdate(); System.out.println(i); } catch (SQLException e) { e.printStackTrace(); }finally { JdbcUtils.close(ps,conn); } } }