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)+"\t";
                 }
                 str += "\n";
             }
             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();
     }

 }