使用Druid的JDBCUtils

//JDBCUtils.java
//依赖: mysql.jar, druid.jar
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.sql.*;
import java.util.Properties;

public class JDBCUtils {
    private static DataSource ds;

    static {
        try {
            Properties pro = new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("resource/druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    public static DataSource getDataSource(){
        return ds;
    }

    public static void close(Statement stmt, Connection conn){
        if(stmt != null){
            try{
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(ResultSet rs, Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        close(stmt, conn);
    }
}

# druid.properitis
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://192.168.31.169:3306/study
username=root
password=root
initialSize=5
maxActive=5
maxWait=3000