java.lang.NumberFormatException

 

java.lang.NumberFormatException: For input string: "pageSizeString"
    java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
    java.lang.Integer.parseInt(Integer.java:447)
    java.lang.Integer.parseInt(Integer.java:497)
    cn.wzg.drp.basedata.web.SearchItemServlet.doGet(SearchItemServlet.java:24)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    cn.wzg.drp.util.filter.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:26)

其实这个异常就是直接把一个字符串转化成Int类型的或者别的，大家看看这样好像一点都不行吧：

 int pageNo =1;
 int pageSize =10;
 String pageSizeString=request.getParameter("pageNo");
if(pageSizeString != null && !"".equals(pageSizeString)){
  //这样就出现了NumberFormatException异常
  pageNo=Integer.parseInt(“pageSizeString”);
}