java连接oracle数据库常用的三种方法

1.使用JDBC_ODBC桥连接方式

public static void main(String[] agrs) {
		try {

			// 1.加载驱动
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
			// 2.得到链接 //your username and your password 
			Connection ct = DriverManager.getConnection("jdbc:odbc:texthx","scott", "123");
			// sql severr 一样
			Statement sm = ct.createStatement();
			ResultSet rs = sm.executeQuery("select * from emp");

			while (rs.next()) {
				// 打印出用户名和薪水
				System.out.println("用户名：" + rs.getString(2));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

2.使用JDBC连接oracle

<span style="font-size:14px;">try {
				 //1.加载驱动
				Class.forName("oracle.jdbc.driver.OracleDriver");
				//2.连接数据库 </span><span style="font-family: Arial, Helvetica, sans-serif;"><span style="font-size:12px;">//your username and your password </span></span><span style="font-size:14px;">
				 Connection ct = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","scott","123");
				 //3.获得数据
				 Statement sm = ct.createStatement();
				
					ResultSet rs = sm.executeQuery("select * from emp");

					while (rs.next()) {

						// 打印出用户名和薪水
						System.out.println("用户名：" + rs.getString(2));

					}
					
					rs.close();
					sm.close();
					ct.close();
			} catch (Exception e) {
				e.printStackTrace();
			}</span>

3.具体名字我也不好说，不过经常看到有人这么用。src源包下建立db.propertis.写下你的配置选项：

driver=oracle.jdbc.driver.OracleDriver
url=jdbc\:oracle\:thin\:@localhost\:1521\:orcl
username=scott
password=123

然后在程序中读取：

private static String username = null; 
	private static String password = null ;
	private static String driver  = null ;
	private static String url = null ;
	static{
		Properties ps = new Properties();
		try {
			ps.load(TextOrc3.class.getResourceAsStream("/db.properties"));
			driver = ps.getProperty("driver");
			url = ps.getProperty("url");
			username = ps.getProperty("username");
			password = ps.getProperty("password");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public  static Connection getConn(){
		Connection conn = null ;
		try {
			Class.forName(driver);
			conn = DriverManager.getConnection(url, username, password);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return conn ;
	}

这种方法可能有人用，可能是想保证数据的安全性吧，毕竟这些数据表面上是不可见的。