A brief analysis of the example of the value transmission problem between JSP pages

This article analyzes the problem of passing values between JSP pages. Share it for your reference, as follows:

The simplest one is to pass the value in the href in the <a> tag.

Write in:

&lt;a href="?name1=value"&gt;&lt;/a&gt;

Then receive in:

<%
   String name2 = new String(("name1").getBytes("ISO-8859-1"),"GBK");
   ("name3",name2);
%>
<input  value="${name3}"/>

This method is relatively simple, but I have also found some problems, such as not loading dynamically, and the value is attached when the page is loading. Let me give you an example.

I have a <select> tag here, which dynamically connects some provinces and cities. Then I want to take the values in <select> and can no longer use href to pass them, because I choose the values in <select> and it is done by myself.

<script>
  var href = "?sd=";
  var getV = function(){
    var add = $("#ad").val();
    href = href + add;
  }
  var h1 = function(){
   = href;
}
</script>
<select  onChange="getV()"></select>
<a  href="#" onClick="hl()" ></a>

I hope this article will be helpful to everyone's JSP programming.