(SID_DESC =
  (GLOBAL_DBNAME = dave)
   (ORACLE_HOME =D:\app\Administrator\product\11.2.0\dbhome_1)
  (SID_NAME = NEWCCS)
 )

Listener.ora
SID_LIST_LISTENER =
 (SID_LIST =
 (SID_DESC =
  (GLOBAL_DBNAME = dave)
   (ORACLE_HOME =D:\app\Administrator\product\11.2.0\dbhome_1)
  (SID_NAME = NEWCCS)
 )
 )
Tnsnames.ora
DVD =
 (DESCRIPTION =
 (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
 )
 (CONNECT_DATA =
  (SERVICE_NAME = dave)
 )
 )

.imporjava.sql.* 
 .publiclasjdb 
 StrindbUr"jdbc:oracle:thin:@...::newccs" 
 StrintheUse"dave" 
 StrintheP"dave" 
 Connectionull 
 Statemenconn 
 ResultSernull 
 publijdbc( 
 tr 
 Class.forName("oracle.jdbc.driver.OracleDriver").newInstance() 
 DriverManager.getConnection(dbUrltheUserthePw) 
 conc.createStatement() 
 catc(Exceptioe 
 e.printStackTrace() 
 publibooleaexecuteUpdate(Strinsql 
 tr 
 conn.executeUpdate(sql) 
 returtrue 
 catc(SQLExceptioe 
 e.printStackTrace() 
 returfalse 
 publiResultSeexecuteQuery(Strinsql 
 rnull 
 tr 
 rconn.executeQuery(sql) 
 catc(SQLExceptioe 
 e.printStackTrace() 
 returrs 
 publivoiclose( 
 tr 
 conn.close() 
 c.close() 
 catc(Exceptioe 
 e.printStackTrace() 
 publistativoimain(String[args 
 ResultSers 
 jdbconnejdbc() 
 rconn.executeQuery("selecfrodavwherrownum<") 
 tr 
 whil(rs.next() 
 System.out.println(rs.getString("username")+"--"+rs.getString("user_id")) 
 catc(Exceptioe 
 e.printStackTrace() 
 . 
 .---输出正常 
 .MGMT_VIEW-- 
 .ANQING-- 
 .DVD-- 
 .SYSMAN-- 

String dbUrl = "jdbc:oracle:thin:@//127.0.0.1:1521/dave";

System.setProperty("oracle.net.tns_admin","D:\\app\\Administrator\\product\\11.2.0\\dbhome_1\\NETWORK\\ADMIN");

.imporjava.sql.
 .publiclasjd
StrindbUr"jdbc:oracle:thin:@dvd
 .StrindbUr"jdbc:oracle:thin:@//...:/dave
 .StrindbUr"jdbc:oracle:thin:@...::newccs
StrintheUse"dave
StrintheP"dave
Connectionul
Statemencon
ResultSernul
publijdbc
 t
 System.setProperty("oracle.net.tns_admin","D:\\app\\Administrator\\product\\..\\dbhome_\\NETWORK\\ADMIN"
 Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(
 ./Class.forName("oracle.jdbc.OracleDriver").newInstance(
 DriverManager.getConnection(dbUrltheUserthePw
 conc.createStatement(
 catc(Exceptio
 e.printStackTrace(
publibooleaexecuteUpdate(Strinsq
 t
 conn.executeUpdate(sql
 returtru
 catc(SQLExceptio
 e.printStackTrace(
 returfals
publiResultSeexecuteQuery(Strinsq
 rnul
 t
 rconn.executeQuery(sql
 catc(SQLExceptio
 e.printStackTrace(
 returr
publivoiclose
 t
 conn.close(
 c.close(
 catc(Exceptio
 e.printStackTrace(
publistativoimain(String[arg
 ResultSer
 jdbconnejdbc(
 rconn.executeQuery("selecfrodavwherrownum<"
 t
 whil(rs.next(
System.out.println(rs.getString("username")+"--"+rs.getString("user_id")
 catc(Exceptio
 e.printStackTrace(

package com.jdbc.OracleTest;
 import java.sql.DriverManager;
 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 public class OracleJdbcConnectionTest {
 /**
 * by jarin 年月日
 * @param args
 */
 public static void main(String[] args) {
 try {
 //第一步要Jar包:在oracle安装的目录下,盘符:\oracle\ora\jdbc\lib\ojdbc.jar
 //加载驱动
 Class.forName("oracle.jdbc.driver.OracleDriver");
 //连接字符串(协议名:jdbc,子协议名: oracle:thin 子名称:@localhost::oracleDB)
 String url ="jdbc:oracle:thin:@localhost::ora";
 try {
  //建立连接
  Connection conn = DriverManager.getConnection(url,"scott","");
  //创建Statement或者是PreparedStatement语句
  Statement st = conn.createStatement();
  String sqlStr= "select ename from emp";
  //执行查询
  ResultSet rs = st.executeQuery(sqlStr);
  //遍历结果
  while (rs.next()) {
  System.out.println(rs.getString());
  }
 } catch (SQLException e) {
  e.printStackTrace();
 }
 } catch (ClassNotFoundException e) {
 e.printStackTrace();
 }
 }
 }