010.Druid数据库连接池

1.导入依赖

<dependency>

<groupId>com.alibaba</groupId>

<artifactId>druid</artifactId>

<version>1.0.9</version>

</dependency>

<dependency>

<groupId>oracle</groupId>

<artifactId>ojdbc6</artifactId>

<version>11.2.0.3</version>

</dependency>

2.创建properties配置文件

#初始化连接数

initialSize=5
minIdle=5
maxActive=10
maxWait=60000
driverClassName=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1522:ORCLL
username=scott
password=tiger

3.封装一个JDBCUtils工具类,以便使用

package com.jdbc.utils;

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.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

@SuppressWarnings("all")
public class JDBCUtils {
    //1.定义成员变量DataSource
    private static DataSource ds;
    static {
        //2.加载配置文件
        Properties pro = new Properties();
        InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
        try {
            pro.load(is);
            //3.获取连接池对象
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取连接
     *
     * @return
     * @throws SQLException
     */
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    /**
     * 释放资源
     *
     * @param stmt
     * @param conn
     */
    public static void close(Statement stmt, Connection conn) {
        if (null != stmt) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (null != conn) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 释放资源
     *
     * @param rs
     * @param stmt
     * @param conn
     */
    public static void close(ResultSet rs, Statement stmt, Connection conn) {
        if (null != rs) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        close(stmt, conn);
    }

    /**
     * 获取连接池
     *
     * @return
     */
    public static DataSource getDataSource() {
        return ds;
    }
}