Jsp:java.lang.NumberFormatException:null

Home.jspPost-aid toEdit.jsp

<input type="button" value="修改" onclick="location.href='Edit.jsp?aid=<%=art.getAsId()%>'"/>

EditControl.jsp 但是在这个页面中，它总是告诉我aid=null

request.setCharacterEncoding("utf-8");
AssetName art= new AssetName();
art.setAsId(Integer.parseInt(request.getParameter("aid")));
art.setUID(request.getParameter("UID"));
art.setAsnu(request.getParameter("asnu"));
art.setAsnm(request.getParameter("asnm"));
art.setAste(request.getParameter("aste"));
art.setSpec(request.getParameter("spec"));

报告

java.lang.NumberFormatException:null

---

我认为问题在于art.getAsId（）。您确定要获取值吗？看起来art.getAsId（）返回null，这就是您面临此异常的原因。您能否验证art.getAsId（）返回的内容

在

中？手动输入

Edit.jsp？aid=13

是否有效？

request.setCharacterEncoding("utf-8");
AssetName art= new AssetName();
art.setAsId(Integer.parseInt(request.getParameter("aid")));
art.setUID(request.getParameter("UID"));
art.setAsnu(request.getParameter("asnu"));
art.setAsnm(request.getParameter("asnm"));
art.setAste(request.getParameter("aste"));
art.setSpec(request.getParameter("spec"));

<input type="button" value="修改" onclick="location.href='Edit.jsp?aid=<%=art.getAsId()%>'"/>

<input type="button" name="aid" value="修改" onclick="location.href='Edit.jsp?aid=<%=art.getAsId()%>'"/>

AssetName art=ad.getInfo(Integer.valueOf(aid));