java中使用JDBC连接数据库的步骤

1.注册驱动
Class.forname("com.mysql.jdbc.Driver");//这是连接mysql数据库的驱动

2.获取数据库连接
java.sql.Connection conn=java.sql.DriverManager.getConnection();

3.获取表达式
java.sql.Statement stmt=conn.createStatement("jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=GBK","root","null");//三个参数分别是数据库连接的URL,用户名，密码

4.执行SQL
java.sql.ResultSet rs=stmt.executeQuery("select * from user");

5.显示结果集里面的数据
while(rs.next()){
System.out.println(rs.getInt(1));
System.out.println(rs.getString("username"));
System.out.println(rs.getString("password"));
System.out.pringln();
}

//执行插入语句
//stmt.executeUpdate("insert into user values(1,'中文','345')");

6.释放资源
rs.close();
stmt.close();
conn.close();