亲们！最近在学JavaWeb，感觉有点蛋疼。只能向大家求助了，改了一上午的代码，系统提示没有任何错误，但是在运行的时候总是达不到效果，下面我把代码罗列出来，大家帮我解决解决！我采用的MVC开发模式：
servlet代码：
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import bean.CtrlSql;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
public class AddVistList extends HttpServlet {
private static final long serialVersionUID=1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
CtrlSql con=new CtrlSql(); //实例化数据库操作类
String radio=request.getParameter("radio");
if (radio.equals("yes")) {
radio="是";
}
else {
radio="否";
}
String address=new String(request.getParameter("address").getBytes("iso8859-1"));
if (address==null) {
address="成都";
}
String name=new String(request.getParameter("name").getBytes("iso8859-1"));
String text=new String(request.getParameter("text").getBytes("iso8859-1"));
DateFormat df=new SimpleDateFormat("yyyy-m-dd HH:mm:ss");
//定义格式化日期的格式
System.out.println("现在开始添加数据！！");
String date=df.format(new Date()); //格式化当前的时间，并赋给date
String sql="insert into 'laifang' values('" //(lf_name,lf_riqi,lf_liuyan,lf_gz,lf_address)
+name
+"','"
+date
+"','"
+text
+"','"
+radio
+"','"
+address+
"')";
//根据获得信息生成插入SQL语句
con.con(); //连接到数据库
con.update(sql); //执行SQl语句
response.sendRedirect("../iframe/message.jsp");//页面转向
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
下面这是jsp页面代码：
<body style="margin-top: 0px;">
<form action="../servlet/AddVistList" method="post">
<table>
<thead>
<tr>
<th colspan="2">
<div style="text-align: right;"><a href=message.jsp>来访纪录</a></div>
</th>
</tr>
</thead>
<tbody>
<tr>
<th>你是否是本校工作人员？</th>
<td>
是<input name="radio" type="radio" value="yes" checked="checked"/>
否<input name="radio" type="radio" value="no"/>
</td>
</tr>
<tr>
<th>你来自什么地方：</th>
<td>
<select name="address">
<option>-请选择你所在的城市-</option>
<option value="成都">成都</option>
<option value="攀枝花">攀枝花 </option>
<option value="南充">南充</option>
<option value="乐山">乐山</option>
<option value="泸州">泸州</option>