java通过配置文件（Properties类）连接Oracle数据库代码示例

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JdbcDemo {
    //创建对象关联配置文件
    private Properties pro = new Properties();
    private String driver;
    private String url;
    private String user;
    private String psw;
    
    public JdbcDemo(){
        try {
            //通过反射获取数据流
            pro.load(this.getClass().getResourceAsStream("MyOrcDb.properties"));
            //获取配置文件数据
            this.setDriver(pro.getProperty("driver"));
            this.setUrl(pro.getProperty("url"));
            this.setUser(pro.getProperty("user"));
            this.setPsw(pro.getProperty("psw"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private void minSalName(){
        
        //连接数据库
        try {
            Class.forName(driver);
            //获取连接
            Connection con;
            con = DriverManager.getConnection(url,user,psw);
            //sql语句载入数据库
            Statement st = con.createStatement();
            //读取各部门最低工资名单
            //关闭数据库
            String sql = "SELECT emp.deptno,emp.ename,emp.sal from emp,"
                    + "(SELECT deptno,min(sal) minSal from emp GROUP BY deptno) a "
                    + "where emp.deptno = a.deptno "
                    + "and emp.sal = a.minsal";
            //获得结果集
            ResultSet rst = st.executeQuery(sql );
            //获得结果集的列数
            int n = rst.getMetaData().getColumnCount();
            //遍历结果集
            String str = "";
            for(;rst.next();){
                for(int i=1;i<=n;i++){
                    str += rst.getString(i)+"	";
                }
                str += "
";
            }
            System.out.println(str);
            //关闭JDBC（先开后关）
            rst.close();
            st.close();
            con.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        catch (SQLException e) {
            e.printStackTrace();
        }
    }
        public String getDriver() {
        return driver;
    }
    public void setDriver(String driver) {
        this.driver = driver;
    }
    public String getUrl() {
        return url;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    public String getUser() {
        return user;
    }
    public void setUser(String user) {
        this.user = user;
    }
    public String getPsw() {
        return psw;
    }
    public void setPsw(String psw) {
        this.psw = psw;
    }
    public static void main(String[] args) {
        JdbcDemo jdbc = new JdbcDemo();
        jdbc.minSalName();
    }

}