java.lang.NumberFormatException: For input string: ""解决思路_J2EE

java.lang.NumberFormatException: For input string: ""
org.apache.jasper.JasperException: An exception occurred processing JSP page /test.jsp at line 48

45: if (currentpage == null) {
46: currentpage = "1";
47: }
48: int pageindex = Integer.parseInt(currentpage);
49: if (pageindex < 1) {
50: pageindex = 1;
51: } else if (pageindex > totalpage) {

Java code

request.setCharacterEncoding("GBK");            page p = new page();            int count = p.getCount();            int pagesize = 2;            int totalpage = p.getTotalpage(count, pagesize);            String currentpage = request.getParameter("pageindex");            //System.out.println(currentpage);            if (currentpage == null) {                currentpage = "1";            }            int pageindex = Integer.parseInt(currentpage);            if (pageindex < 1) {                pageindex = 1;            } else if (pageindex > totalpage) {                pageindex = totalpage;            }            List<News> list = p.getnewslist(pageindex, pagesize);            //request.setAttribute("newslist", list);            for (News news : list) {        %>        <%=news.getTitle()%><br />        <%            }        %>        当前页数[<%=pageindex%>/<%=totalpage%>]        <%            if (pageindex > 1) {        %>        <a href="test.jsp?pageindex=1">首页</a>&nbsp;        <a href="test.jsp?pageindex=" <%=pageindex - 1%>>上一页</a>&nbsp;        <%            }            if (pageindex < totalpage) {        %>        <a href="test.jsp?pageindex=" <%=pageindex + 1%>>下一页</a>&nbsp;        <a href="test.jsp?pageindex=" <%=totalpage%>>尾页</a>&nbsp;        <%            }        %>

------解决方案--------------------
if (currentpage == null || currentpage.isEmpty()) {
currentpage = "1";
}
------解决方案--------------------
顶

探讨
if (currentpage == null || currentpage.isEmpty()) {
currentpage = "1";
}

------解决方案--------------------
jsp页面报错真麻烦，不能定位到报错的地方。不过可以确认的是，肯定是Integer.parseInt(xxxxx)报错的，xxxxx的值为“”。。。
代码迷推荐解决方案：An exception occurred processing JSP page,http://www.daimami.com/search?q=33144