用JDBC如何调用存储过程

Class.forName("com.mysql.jdbc.Driver");

String url = "jdbc:mysql:///test";

Connection cn = DriverManager.getConnection(url, "root", "root");

String sql = "{call insert_student(?,?,?)}";

CallableStatement cstmt = cn.prepareCall(sql);

cstmt.registerOutParameter(3, Types.INTEGER);

cstmt.setString(1, "wangwu");

cstmt.setInt(2, 25);

cstmt.execute();

// get第几个，不同的数据库不一样，建议不写

System.out.println(cstmt.getString(3));