page.pageNum+1>page.totalPage?page.totalPage:page.pageNum+1
看着没什么问题，但是会出现转换异常
javax.el.ELException: Error Parsing: ${page.pageNum+1>page.totalPage?page.totalPage:page.pageNum+1}
org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:125)
org.apache.el.lang.ExpressionBuilder.build(ExpressionBuilder.java:146)
org.apache.el.lang.ExpressionBuilder.createValueExpression(ExpressionBuilder.java:190)
org.apache.el.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:68)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:922)
org.apache.jsp.main_jsp._jspService(main_jsp.java:132)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
com.itheima.web.controller.ControllerServlet.showIndex(ControllerServlet.java:75)
com.itheima.web.controller.ControllerServlet.doGet(ControllerServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
com.itheima.filter.SetAllCharacterEncodingFilter.doFilter(SetAllCharacterEncodingFilter.java:44)
解决办法：
page.pageNum+1>page.totalPage?(page.totalPage):(page.pageNum+1)
这样就会各自运算各自的