[JavaScript知识库]JavaWeb bug及解决方式（二）

52:             </tr>
53:             <tr>
54:             <c:forEach var="obj" items="${requestScope.all} " varStatus="fl" >
55:             <td>${obj.foodName}&nbsp&nbsp${obj.foodprice}</td>
56:                     <c:if test="${fl.count%4 eq '0'}"></tr>
57:             </c:if>

错误日志：org.apache.jasper.JasperException: 在 [55] 行处理 [/store.jsp] 时发生异常

错误原因? items="${requestScope.all}? "后添加了空格 提示500

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<form action="${pageContext.request.contextPath}/login" method="post">
				<input type="button" value="退出" onclick="location.href='${pageContext.request.contextPath}/logout'"/>
				<input type="button" value="个人信息" onclick="location.href='user.jsp'"/>
				</form>

错误日志：404

解决方法 在jsp文件body下构建javascript脚本

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  writer.print("<script type='text/javascript'> alert('请先登录'); location.href='login.jsp'</script>");

 PrintWriter writer = resp.getWriter();
            writer.print("<script type='text/javascript'> alert('请先登录'); location.href='login.jsp'</script>");
            writer.print("<script type='text/javascript'>");
            writer.print("alert('请先登录');");
            writer.print("location.href='login.jsp';");
            writer.print("</script>");

错误日志：第一条无弹窗内容

问题原因 writer方法中需要写分号