修改您的脚本标签，如下所示：

modify your script tag like this:

<script type="text/javascript">
function gotoa(){
    $.get("http://localhost:8080/2_8_2012/jsp/GetJson.jsp", function(result) {
        var storedata={
            identifier:"ID",
            label:"name",
            items: result
             };

            var store = new dojo.data.ItemFileWriteStore({data: storedata});
    });

}
</script>

GetJson.jsp的代码是：

The code for GetJson.jsp is :

<%@page contentType="application/json" %>
<%@page import="MyPackage.PopulateTextbox" %>
<%
String temp1;
PopulateTextbox obj = new PopulateTextbox();
temp1 = obj.method();
%>

<%=temp1 %>

现在调用 gotoa（）
它将初始化ajax调用并在回调函数

Now call gotoa() it will initialize the ajax call and get the response in callback function