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

import java.io.FileInputStream;  2 import java.io.IOException;  3 import java.io.InputStream;  4 import java.sql.Connection;  5 import java.sql.DriverManager;  6 import java.sql.ResultSet;  7 import java.sql.SQLException;  8 import java.sql.Statement;  9 import java.util.Properties;  10 
public class JdbcDemo {  12     //创建对象关联配置文件
    private Properties pro = new Properties();  14     private String driver;  15     private String url;  16     private String user;  17     private String psw;  18     
    public JdbcDemo(){  20         try {  21             //通过反射获取数据流
            pro.load(this.getClass().getResourceAsStream("MyOrcDb.properties"));  23             //获取配置文件数据
            this.setDriver(pro.getProperty("driver"));  25             this.setUrl(pro.getProperty("url"));  26             this.setUser(pro.getProperty("user"));  27             this.setPsw(pro.getProperty("psw"));  28         } catch (IOException e) {  29  e.printStackTrace();  30  }  31  }  32     
    private void minSalName(){  34         
        //连接数据库
        try {  37  Class.forName(driver);  38             //获取连接
 Connection con;  40             con = DriverManager.getConnection(url,user,psw);  41             //sql语句载入数据库
            Statement st = con.createStatement();  43             //读取各部门最低工资名单  44             //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";  49             //获得结果集
            ResultSet rst = st.executeQuery(sql );  51             //获得结果集的列数
            int n = rst.getMetaData().getColumnCount();  53             //遍历结果集
            String str = "";  55             for(;rst.next();){  56                 for(int i=1;i<=n;i++){  57                     str += rst.getString(i)+"\t";  58  }  59                 str += "\n";  60  }  61  System.out.println(str);  62             //关闭JDBC（先开后关）
 rst.close();  64  st.close();  65  con.close();  66         } catch (ClassNotFoundException e) {  67  e.printStackTrace();  68  }  69         catch (SQLException e) {  70  e.printStackTrace();  71  }  72  }  73         public String getDriver() {  74         return driver;  75  }  76     public void setDriver(String driver) {  77         this.driver = driver;  78  }  79     public String getUrl() {  80         return url;  81  }  82     public void setUrl(String url) {  83         this.url = url;  84  }  85     public String getUser() {  86         return user;  87  }  88     public void setUser(String user) {  89         this.user = user;  90  }  91     public String getPsw() {  92         return psw;  93  }  94     public void setPsw(String psw) {  95         this.psw = psw;  96  }  97     public static void main(String[] args) {  98         JdbcDemo jdbc = new JdbcDemo();  99  jdbc.minSalName(); 100  } 101 
}