终于实现动态加载JDBC驱动-oralce

终于实现动态加载JDBC驱动-oralce

2007-06-08 20:56

配置文件： oracle.properties jdbc.driver=oracle.jdbc.driver.OracleDriver jdbc.url=jdbc:oracle:thin:@192.168.2.67:1521:xt jdbc.user=sa jdbc.password=sa 连接数据库类： //package com.conn; // import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLClassLoader; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.sql.Driver; import java.util.Properties; public class Conn2 { private String dbUrl=null; private String theUser=null;//用户名 private String thePw =null;//密码 private Connection c=null;// private Statement conn; private ResultSet rs=null; private String driver = null; private File jdbcDriverJarFileLocation = new File("d:\\oracle\\ora92\\jdbc\\lib\\ojdbc14.jar"); public Conn2(){      try {       //ORACLE的JDBC驱动类       Properties pro = new Properties();       try {        pro.load(new FileInputStream("oracle.properties"));       } catch (FileNotFoundException e1) {        // TODO Auto-generated catch block        e1.printStackTrace();       } catch (IOException e1) {        // TODO Auto-generated catch block        e1.printStackTrace();       }       //System.out.println(pro.getProperty("jdbc.driver"));       dbUrl = pro.getProperty("jdbc.url");       theUser=pro.getProperty("jdbc.user");       thePw=pro.getProperty("jdbc.password");       driver=pro.getProperty("jdbc.driver");       System.out.println("1 "+driver);       try {        URL jdbcDriverURL = jdbcDriverJarFileLocation.toURL();        URL[] urls = new URL[1];        urls[0] = jdbcDriverURL;        URLClassLoader urlclassLoader = new URLClassLoader( urls,ClassLoader.getSystemClassLoader());          try {         java.sql.Driver driverd = (java.sql.Driver)urlclassLoader.loadClass(driver).newInstance();         System.out.println(driverd.toString());         Properties      props      =      new      Properties();                           props.setProperty("user",      theUser);                           props.setProperty("password", thePw     );         try {          c = driverd.connect(dbUrl, props);         } catch (SQLException e) {          // TODO Auto-generated catch block          e.printStackTrace();         }              } catch (InstantiationException e) {         // TODO Auto-generated catch block         e.printStackTrace();        } catch (IllegalAccessException e) {         // TODO Auto-generated catch block         e.printStackTrace();        }//                 } catch (MalformedURLException e1) {        // TODO Auto-generated catch block        e1.printStackTrace();       }          try {       conn=c.createStatement();      } catch (SQLException e) {       // TODO Auto-generated catch block       e.printStackTrace();      } } catch (ClassNotFoundException e) {      // TODO Auto-generated catch block      e.printStackTrace(); } } //度曲配置文件。 public ResultSet executeQuery(String sql){      rs = null;      try {       rs = conn.executeQuery(sql);      } catch (SQLException e) {       // TODO Auto-generated catch block       e.printStackTrace();      }      return rs;    } public void close(){      try {       conn.close();       c.close();      } catch (SQLException e) {       // TODO Auto-generated catch block       e.printStackTrace();      }       } public static void main(String[]args){      //newjdbc.testPorpertiesFile();      ResultSet newrs;      //ConnectOracle newjdbc = new ConnectOracle();      Conn2 newjdbc = new Conn2();      System.out.println("连接成功");      newrs = newjdbc.executeQuery("select * from scott.dept");      try {       System.out.println("deptno     |     dname      |       loc");       while(newrs.next()){             System.out.print(newrs.getString("deptno")+"        ");        System.out.print(newrs.getString("dname")+"      ");        System.out.println(newrs.getString("loc"));            }      } catch (SQLException e) {       // TODO Auto-generated catch block       e.printStackTrace();      }      newjdbc.close(); } }