jsp连接Sql2008updata操作

<%@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312" import="java.sql.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>update数据</title>
</head>
<body>
<center>
   <%
    String url = "jdbc:sqlserver://localhost:1433; DatabaseName=JavaJdbc";
    String user = "sa";
    String password = "110";
    Connection conn = null;
    PreparedStatement pstmt = null;

    String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    try {

     Class.forName(driverName).newInstance();

     conn = DriverManager.getConnection(url, user, password);

    } catch (ClassNotFoundException e) {
     out.println(e);
    } catch (SQLException e) {
     out.println("连接SQLserver数据库失败！！！！！！");
    }

    try{
    Statement stmt = conn.createStatement();
    String sql_update = "update employee set age=58 where id='1'";
    int result_update = stmt.executeUpdate(sql_update);
    }catch(SQLException e){
     out.println("更新失败！");
    }
    try{
     if(pstmt!=null){
      pstmt.close();
      pstmt=null;
     }
     if(conn!=null){
      conn.close();
      conn=null;
     }
    }catch(Exception e){
     out.println("数据库关闭异常！");
    }
    out.println("更新成功！");
   %>
</center>
</body>
</html>