jsp求助啊

来源：百度知道 编辑：UC知道 时间：2024/09/25 19:12:27
求助
java.lang.NumberFormatException: null
at com.caucho.jsp.PageContextImpl.handlePageException(PageContextImpl.java:957)
at _jsp._ajax._addbehind__jsp._jspService(_addbehind__jsp.java:64)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.pageservice(Page.java:571)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:155)
at com.kenfor.exutil.SetCharacterEncodingFilter.doFilter(Unknown Source)
at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:84)
at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:177)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:177)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:221)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:263)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:331)

NumberFormatException
你是不是想把一字符串转换为一种数值类型啊?是不是该字符串不能转换为适当格式啊?字符串是不是空的?
public class LeiA {

public static void main(String[] args)throws IOException{
String t="";
int i=Integer.parseInt(t);
}
}
像这种形式就可能出现你那种异常