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jsp计算器问题的输出小数部分报错 int num1=0; int num2=0; int result=0; double result2=0; num1=Integer.parseInt(s_num1); num2=Integer.parseInt(s_num2); if(){................. }else if(flag.equals("/")){ double num3 = (double)num1; double num4 = (double)num2; result2=num3/num4; } out.println("结果是:"+result2); 放到eclipse没问题, ie页面因为这小数转换部分报错(如果不设小数值,则3/4也输出结果0) org.apache.jasper.JasperException: An exception occurred processing JSP page /myCal.jsp at line 4340: int result=0;41: double result2=0;42: 43: num1=Integer.parseInt(s_num1);44: num2=Integer.parseInt(s_num2);45: 46: if(flag.equals("+")){Stacktrace:org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:580)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)javax.servlet.http.HttpServlet.service(HttpServlet.java:731)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause java.lang.NumberFormatException: nulljava.lang.Integer.parseInt(Integer.java:542)java.lang.Integer.parseInt(Integer.java:615)org.apache.jsp.myCal_jsp._jspService(myCal_jsp.java:124)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)javax.servlet.http.HttpServlet.service(HttpServlet.java:731)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)javax.servlet.http.HttpServlet.service(HttpServlet.java:731)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.82 logs.
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