提交时的菜鸟问题

log.jsp
<html>
<head>
<title>step1</title>
</head>
<%@page contentType="text/html; charset=gb2312" %>
<%
    out.println("Pls input information!\n");
%>
<body>
<form type=POST action="updata.jsp">
<br>
<b>ID: </b>
<input type="text" name="id1">
<br>
<b>名称:</b>
<input type="text" name="name1">
<br>
<b>值: </b>
<t><input type="text" name="value1">
</br>
<input type="submit" value="登录">
<input type="reset" value=" 刷新">
</body>
</html>
updata.jsp
<%@page contentType="text/html; charset=gb2312" %>
<%@page language="java" %>
<%@page import="java.sql.*" %>
　
<%! boolean islegal=true;
    String idString = "";
    Integer idInteger = new Integer(0);
    int id2 = 0;
    String name2 = "";
    String value2 = "";
%><%  idString = request.getParameter("id1");
    for(int i=0;i<idString.length();i++)
    {
        if(((char)idString.charAt(i)>'9')||((char)idString.charAt(i)<'0'))
        {
            islegal = false;
            break;
        }

    }
    if(islegal)
    {
        idInteger = java.lang.Integer.valueOf(idString);
        id2 = idInteger.intValue();
        name2 = request.getParameter("name1");
        value2 = request.getParameter("value1");
    }
%>
<html>
<head>
<title>step2</title>
</head>
<body>
<form  method="post" action="delrelog.jsp"><% if(islegal)
   {

    }
        out.print("<br>"
                   +"<input type='submit' name='delete' value='删除'>"
                   +"</form>");
        out.print("<form method='post' action='addrelog.jsp'>"
                   +"<input type='submit' name='addnew' value='新增'>"
                   +"</form>");
    }
    else
    {
        out.print("ID must be numderic");
        out.print("<br>"
                  +"</form>"
                  +"<form method='post' action='log.jsp'>"
                  +"<input type='submit' name='relog' value='重新输入'>"
                   +"</form>");
    }
%><br>
</body>
</html>

<html>
<head>
<title>step1</title>
</head>
<%@page contentType="text/html; charset=gb2312" %>
<%
    out.println("Pls input information!\n");
%>
<body>
<form type=POST action="updata.jsp">
<br>
<b>ID: </b>
<input type="text" name="id1">
<br>
<b>名称:</b>
<input type="text" name="name1">
<br>
<b>值: </b>
<t><input type="text" name="value1">
</br>
<input type="submit" value="登录">
<input type="reset" value=" 刷新">
</body>
</html>
<%@page contentType="text/html; charset=gb2312" %>
<%@page language="java" %>
<%@page import="java.sql.*" %>
　
<% boolean islegal=true;
    String idString = "";
    Integer idInteger = new Integer(0);
    int id2 = 0;
    String name2 = "";
    String value2 = "";
%><%  idString = request.getParameter("id1");
    for(int i=0;i<idString.length();i++)
    {
        if(((char)idString.charAt(i)>'9')||((char)idString.charAt(i)<'0'))
        {
            islegal = false;
            break;
        }

    }
    if(islegal)
    {
        idInteger = java.lang.Integer.valueOf(idString);
        id2 = idInteger.intValue();
        name2 = request.getParameter("name1");
        value2 = request.getParameter("value1");
    }
%>
<html>
<head>
<title>step2</title>
</head>
<body>
<form  method="post" action="delrelog.jsp"><% if(islegal)
   {
        out.print("<br>"
                   +"<input type='submit' name='delete' value='删除'>"
                   +"</form>");
        out.print("<form method='post' action='addrelog.jsp'>"
                   +"<input type='submit' name='addnew' value='新增'>"
                   +"</form>");
    }
    else
    {
        out.print("ID must be numderic");
        out.print("<br>"
                  +"</form>"
                  +"<form method='post' action='log.jsp'>"
                  +"<input type='submit' name='relog' value='重新输入'>"
                   +"</form>");
    }
%><br>
</body>
</html>你的代码，我经过调试，没有出现你所说的问题啊。
你的opr.jsp呢？

我是想在第二个页面updata.jsp验证输入ID是否数字，否则回到log.jsp
现在是输入一次非字符后，回到log.jsp再输入数字仍按非字符处理
第一次就输入数字就正确

还是不行，怪哉！而且地址中传递的是正确参数
http://localhost:8080/system/updata.jsp?id1=46&name1=fgh&value1=fgj
为什么按照错误的id1处理呢？

if 中只是以下一些操作，会影响吗？
try
{
           Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
           Connection con = DriverManager.getConnection("jdbc:odbc:demo");
           Statement stmt = con.createStatement();

           String sqlLanguageString ="select * from tname";// where wbcss = "+id2
                                 //+" AND headname = " +"'" +name2+"'"+ " AND headvalue = " +"'"+value2+"'";
           ResultSet rst = stmt.executeQuery(sqlLanguageString);

           while(rst.next())
           {
               int outputId = rst.getInt("wbcssid");
               Integer outputIdInteger = new Integer(outputId);
               String outputIdString = outputIdInteger.toString();
               String outputHead = rst.getString("headname");
               String outputValue = rst.getString("headvalue");
               String checkValue = "record" + outputIdString;
               out.println("<p><input type=checkbox name='recordcheck' value="+outputIdString+">"
                            +"<a href='save.jsp'>"+outputId+outputHead+outputValue);
               out.println("<br>");
           }

        }
        catch(ClassNotFoundException e)
        {
            System.out.print("ClassNotFoundException occur when connect to database!");
        }
        catch(SQLException e)
        {
            System.out.print("SQLException occur when output data!");
        }
        out.print("<br>"
                   +"<input type='submit' name='delete' value='删除'>"
                   +"</form>");
        out.print("<form method='post' action='addrelog.jsp'>"
                   +"<input type='submit' name='addnew' value='新增'>"
                   +"</form>");
    }

<%  idString = request.getParameter("id1");
out.println("id1=="+idString) ;
    for(int i=0;i<idString.length();i++)
    {
        if(((char)idString.charAt(i)>'9')||((char)idString.charAt(i)<'0'))
        {
            islegal = false;
            break;
        }

    }
    if(islegal)
    {
        idInteger = java.lang.Integer.valueOf(idString);
        id2 = idInteger.intValue();
out.println("id2=="+id2) ;
        name2 = request.getParameter("name1");
        value2 = request.getParameter("value1");
    }
%>
用上面的代码跟踪一下。

<%  idString = request.getParameter("id1");
out.println("id1=="+idString) ;//***

    for(int i=0;i<idString.length();i++)
    {
        if(((char)idString.charAt(i)>'9')||((char)idString.charAt(i)<'0'))
        {
            islegal = false;
            break;
        }

    }
    out.print(islegal);////*******
输出id是数字，islegal  is false???

out.println("id1=="+idString) ;//***
这里输出的是什么？

<%  idString = request.getParameter("id1");
islegal=true;//*******I see.But Why must set true here???

    for(int i=0;i<idString.length();i++)
    {
        if(((char)idString.charAt(i)>'9')||((char)idString.charAt(i)<'0'))
        {
            islegal = false;
            break;

你最是在log.jsp中用js来判断id1值是否是数字，如果是则提交，
如果不是，出现提示错误信息，且不能提交，这样在update中就不
要判断了，其实是不提昌在下过页面进行判断的。
下面提供js函数。//检测是否是整数
function isInteger(inputVal) {
   var iNumber;
   if (inputVal.length > 0) {
        iNumber = Number(inputVal);
        if (isNaN(iNumber))
            return false;
        else if (String(iNumber).indexOf(".") >= 0)
            return false;
    }
    return true;
}
你在update.jsp中可这样来接收id1的数据。
            int id1 = Integer.parseInt(request.getParameter("id1").equals("")?"0":request.getParameter("id1")) ;这样你就不用判断了，直接组合sql进行查询。
试试吧。

调试易

提交时的菜鸟问题

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