[英]How to add array values in drop down list using java servlet
朋友请告诉我如何使用Java Servlet在下拉列表中添加数组值列表。
请检查以下代码,并告知该代码中的任何错误。
我的Jsp页面... DropDown.jsp
<body onload="callAction()">
<form>
<script type="text/javascript">
function callAction() {
document.location.href="http://localhost:8084/Servlet/DropDown";
}
</script>
<select name="Day"><option>Day</option>
<c:forEach items="${Data}" var="d">
<option value="${d}">${d}</option>
</c:forEach>
</select>
</form>
</body>
我的Servlet页面DropDown.java
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
int[] day=new int[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31};
request.setAttribute("Data", day);
response.sendRedirect("DropDown.jsp");
}
编辑
的servlet
int[] day=new int[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31};
request.setAttribute("Data", day);//<-- no loop required !
//response.sendRedirect("DropDown.jsp");//<-- this will make a new request
request.getRequestDispatcher("DropDown.jsp").forward(request, response);//<-- forward it
DropDown.jsp:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<select name="Day">
<option>Day</option>
<c:forEach var="d" items="${Data}">
<option value="${d}">${d}</option>
</c:forEach>
</select>
for(int i=1;i<=day.length;i++)
{
request.setAttribute("data", day[i]);
}
它将覆盖data
属性并替换新值。 只需使用数组设置属性。
了request.setAttribute( “数据”,日);
然后在您的select
使用JSTL并导入jstl标签库
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<select name="Day">
<c:foreach items="${data}" var="d">
<option>${d}</option>
</c:foreach>
</select>
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