Question

java web 关于jsp页面在跳转的时候总是出现异常？

我在写一个servlet 的程序的时候   总是抛出这样的异常  这是什么原因    大概给我点点一下org.apache.jasper.JasperException: java.lang.NumberFormatException: For input string: "title" org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:491) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) com.servletlogin.Correct.doPost(Correct.java:48) com.servletlogin.Correct.doGet(Correct.java:28) javax.servlet.http.HttpServlet.service(HttpServlet.java:617) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)root cause java.lang.NumberFormatException: For input string: "title" java.lang.NumberFormatException.forInputString(NumberFormatException.java:48) java.lang.Integer.parseInt(Integer.java:447) java.lang.Integer.parseInt(Integer.java:497) javax.el.ListELResolver.coerce(ListELResolver.java:167) javax.el.ListELResolver.getValue(ListELResolver.java:51) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) org.apache.el.parser.AstValue.getValue(AstValue.java:123) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:935) org.apache.jsp.daily_002dmodify_jsp._jspService(daily_002dmodify_jsp.java:211) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) com.servletlogin.Correct.doPost(Correct.java:48) com.servletlogin.Correct.doGet(Correct.java:28) javax.servlet.http.HttpServlet.service(HttpServlet.java:617) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)note The full stack trace of the root cause is available in the Apache Tomcat/6.0.29 logs.

Answer 1

数据转换异常。你在把字符转成数字的时候抛出了异常。那个字符的值是“title”

Answer 2

title变量的数字格式化出错.

Answer 3

NumberFormatException: For input string: "title"，“title”数据转换异常；
com.servletlogin.Correct.doPost(Correct.java:48)，correct类里看下

Answer 4

NumberFormatException，注意看数字格式化代码