JSP页面之间的传值
这周在调支付宝的接口。期间需要把我方程序处理后的参数(交易金额)按照规定的格式传递给支付宝的接口。因为中途要设计到我方程序对一些数据的处理，所以并不方便直接传值过去。思来想去，决定先把我方的数据提交给webwork的Action进行处理，也就是对数据库进行操作；然后把交易金额以及支付宝接口需要的其他参数一并传递给一个JSP页面，并让这个JSP页面在把action直接指向支付宝的网关接口，注意：中间过程中这个JSP页面时不显示出来的。为此，做了如下测试：建立两个JSP页面,tes1.jsp和test2.jsp。代码如下：
----------------------------------------------------------------------------------------------------------------
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'test1.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<meta http_equiv="refresh" content="5">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="javascript" type="text/javascript">
function execute(){
var obj = document.getElementById("name");
document.form1.action="alipay/test2.jsp?param="+obj.value;
document.form1.submit();
}
</script>
</head>
<body onload="execute();">
<form name="form1" method="post">
<table>
<tr>
<td>
测试JSP页面传值<input type="text" id="username" value="luodada">
</td>
</tr>
</table>
</form>
</body>
</html>
tset2.jsp的代码如下：
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'test2.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
String value = request.getParameter("param");
out.print("从test1.jsp传递过来的值是 " + value);
%>
</body>
</html>
具体思路如下：
在test1.jsp中，通过JavaScript把文本框中的值获取出来，<body onload="javascript函数">，使test1.jsp在加载进来的时候马上执行页面跳转；
在test2.jsp中通过request.getParameter("参数名称");来获取test1.jsp传递过来的值即可。