(项目笔记)<include>与<jsp:param>配合 传值
2017-08-31 16:23
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在我的第一个博客上对jsp中的包含进行了说明,这里对其中的参数传值进行补充:这是一个网站注册的例子 头部作为单独的一部分包含到主页面中,在注册完后 需要对头部的jsp传参。
private void doregist(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
// TODO Auto-generated method stub
String registerusername=request.getParameter("registerusername");
registerusername = new String(registerusername.getBytes("ISO-8859-1"), "utf-8");
String registerpassword=request.getParameter("registerpassword");
String code=request.getParameter("code");
request.getRequestDispatcher("index.jsp").forward(request, response);
Userinfodao userinfodao=new Userinfodao();
userinfodao.inputuser(registerusername, registerpassword);
/*response.getWriter()
request.setAttribute("username", registerusername);
}
index.jsp中包含的代码
<div class="head">
<jsp:include page="Head.jsp">
<jsp:param value="${username}" name="username" />
</jsp:include>
这里说明下 参值可通过标签<jsp:param value="${username}" name="username" /> value为值, name为作为传值的变量。
<c:set value="${param.username}" var="talib"></c:set> //这里就是通过el表达式的到index.jsp中通过标签 <jsp:param
>传过来的值
<c:set value="" var="tali"></c:set>
//${param.username} 类似request.getparameter("username")得带标签<jsp:param >中变量username的值
<c:if test="${ talib ne tali}">
<script type="text/javascript">
document.getElementById("logina").style.display="none";
document.getElementById("registera").style.display="none";
document.getElementById("c-header-right-user-name").style.display="block";
document.getElementById("c-header-right-user-name").innerHTML=${talib };
</script></c:if>
这里通过jstl形式表达出来,若想拷贝代码测试需要添加<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
代码如下:
indexservlet.java中的函数:
private void doregist(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
// TODO Auto-generated method stub
String registerusername=request.getParameter("registerusername");
registerusername = new String(registerusername.getBytes("ISO-8859-1"), "utf-8");
String registerpassword=request.getParameter("registerpassword");
String code=request.getParameter("code");
request.getRequestDispatcher("index.jsp").forward(request, response);
Userinfodao userinfodao=new Userinfodao();
userinfodao.inputuser(registerusername, registerpassword);
/*response.getWriter()
request.setAttribute("username", registerusername);
}
index.jsp中包含的代码
<div class="head">
<jsp:include page="Head.jsp">
<jsp:param value="${username}" name="username" />
</jsp:include>
</div>
这里说明下 参值可通过标签<jsp:param value="${username}" name="username" /> value为值, name为作为传值的变量。
Head.jsp
<c:set value="${param.username}" var="talib"></c:set> //这里就是通过el表达式的到index.jsp中通过标签 <jsp:param
>传过来的值
<c:set value="" var="tali"></c:set>
//${param.username} 类似request.getparameter("username")得带标签<jsp:param >中变量username的值
<c:if test="${ talib ne tali}">
<script type="text/javascript">
document.getElementById("logina").style.display="none";
document.getElementById("registera").style.display="none";
document.getElementById("c-header-right-user-name").style.display="block";
document.getElementById("c-header-right-user-name").innerHTML=${talib };
</script></c:if>
这里通过jstl形式表达出来,若想拷贝代码测试需要添加<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
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