在jsp页面中使用onchange属性调用下面的方法：

在script中写入：

function fromid(){   var from_id = $("#from_id").val();   var addurl = "&from_id="+from_id;   $.ajax({      url:
     +addurl,      type:"get",      dataType:"json",      success:function(html){        document.getElementById("link_man").value = html[0].linkman;        document.getElementById("link_tel").value = html[0].tel;        document.getElementById("fax").value = html[0].fax;      }   });}

 

//后台action中调用方法

public void fromid(ActionMapping mapping, ActionForm form,        HttpServletRequest request, HttpServletResponse response) throws Exception{      String from_id = request.getParameter("from_id");      SqlRuturn ret;      List list = null;      try {        ret = Executer.getInstance().ExecSeletSQL("select trim(linkman) as linkman,trim(tel) as tel,trim(fax1) as fax from LO_SUPPLIERFACTORY where factoryid="+from_id);        list = ret.getResultSet();      } catch (DbException e) {        e.printStackTrace();      }      JSONArray jsonarray = JSONArray.fromObject(list);      PrintWriter out = response.getWriter();      out.print(jsonarray.toString());      out.close();   }