一个鬼问题使用Servlet制作投票程序,要将结果写入数据库.高手来看看
package com;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import com.microsoft.jdbc.sqlserver.SQLServerDriver;
import java.util.*;
import java.io.*;
public class SendTestServlet extends HttpServlet
{
private Connection con;
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
try
{
String test=request.getParameter( "test ");
Statement stm=con.createStatement();
try
{
if(test== "A ")
{
stm.execute( "update test_info set test1=test1+1 where id=1 ");
}
if(test== "B ")
{
stm.execute( "update test_info set test2=test2+1 where id=1 ");
}
if(test== "C ");
{
stm.execute( "update test_info set test3=test3+1 where id=1 ");
}
if(test== "D ");
{
stm.execute( "update test_info set test4=test4+1 where id=1 ");
}
}
catch(Exception e)
{
}
RequestDispatcher requestDispatcher = request.getRequestDispatcher( "/viewTest_servlet ");
requestDispatcher.forward(request,response);
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
doGet(request,response);
}
public SendTestServlet()
{
String CLASSFORNAME= "com.microsoft.jdbc.sqlserver.SQLServerDriver ";
String SERVANDDB= "jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=ts5 ";
String USER= "bn ";
String PWD= "bn ";
try
{
Class.forName(CLASSFORNAME);
con = DriverManager.getConnection(SERVANDDB,USER,PWD);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
投票页面为常规表单GET提交方法
4个单选框的名称都为test 定义4个值分别为ABCD
数据库结构为 id test1 test2 test3 test4
通过if语句来判断用户的选择..
但是执行后不管选的是哪一个 test3 和test4 的值都+1
很奇怪
请高手帮忙.
[解决办法]
test== "A "我认为是这个的问题使用test.equals( "A ")试下
[解决办法]
用IF---ELSE IF---ELSE来实现试试
