关于JDBC奇葩的问题，请大神指教，搞了一天了，好蒙！！

代码如下package jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class FirstJDBCTest {

public static void main(String[] args) {
    FirstJDBCTest dao = new FirstJDBCTest();
    dao.findAll();
}
public void findAll() {
    Connection con = null;
    Statement stmt = null;
    ResultSet rs = null;
    try {
        Class.forName("oracle.jdbc.driver.OracleDriver");
        con = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:tarena", "scott", "123456");
        stmt = con.createStatement();
        rs = stmt
                .executeQuery("select empno, ename, sal, hiredate from emp");
        while (rs.next()) {
            System.out.println(rs.getInt("empno") + ","
                    + rs.getString("ename") + ","
                    + rs.getDouble("sal") + "," + rs.getDate("hiredate"));
        }
    } catch (ClassNotFoundException e) {
        System.out.println("驱动类无法找到!");
        throw new RuntimeException(e);
    } catch (SQLException e) {
        System.out.println("数据库访问异常!");
        throw new RuntimeException(e);
    } finally {
        try {
            if (rs != null) {
                rs.close();
            }
            if (stmt != null) {
                stmt.close();
            }
            if (con != null) {
                con.close();
            }
        } catch (SQLException e) {
            System.out.println("关闭连接时发生异常");
        }
    }
}

}
下面是相应的JAR包图片说明
下面是报错信息图片说明

确认你的库已经在classpath里

try to follow this:

 The following are the steps that are given below to add ojdbc14.jar in eclipse:

1) Inside your project

2) Libraries

3) Right click on JRE System Library

4) Build Path

5) Select Configure Build Path

6) Click on Add external JARs...

7) C:\oraclexe\app\oracle\product\10.2.0\server\jdbc\lib

8) Here you will get ojdbc14.jar

9) select here

10) open

11) ok

save and run the program you will get output.

try this
http://stackoverflow.com/questions/15598757/oracle-jdbc-driver-oracledriver-classnotfoundexception

jar包不对
JDBC连接oracle要用
classes14.jar

驱动类使用的不对，换个驱动oracle jar 包

没找到合适的驱动类

第一像他们说的找不到驱动类；第二看看数据库名，账号，密码是否正确（注意空格）

你可以试试将ojdbc14的那个jar包换一下版本。这个可以在你的oracle安装目录中找到（下面是我的）：
比如我的