1.前台页面：

    function sayHello() {

            var userName=dojo.byId("userName").value;             dojo.xhrGet({                 url: "<%=request.getContextPath()%>/test.do?method=test",                 handleAs: "text",                 content: { key1:userName, key2: "value2", key3: "value3" },                 load: function(responseText)                 {                   dojo.byId("first_name").value = responseText;                   dojo.byId("t1").value = responseText;                   dijit.byId("description").value = responseText;                   document.getElementById("middle_initial").value=responseText;                 },                 error: function(response)                 {                   alert("Error");                 }             });         }

2.后台action中：

    public ActionForward test(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response)             throws Exception {         request.setCharacterEncoding("utf-8");         response.setContentType("text/html");         response.setCharacterEncoding("utf-8");         PrintWriter out = response.getWriter();         String key1=request.getParameter("key1");         out.print(key1);         return null;     }