java開發的信息系統裏，jsp與java文件是怎麽傳遞數據的啊？

jsp與java文件傳遞數據可以使用Servlet類來傳遞，jsp將數據存入到request對象中，Servlet類獲取這個request對象，並將數據取出。

示例代碼如下：

JSP代碼：<%@?page?language="java"?import="java.util.*"?pageEncoding="UTF-8"%>

<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">

<html>

<head>

</head>

<body>

<form?action="/demoServlet"?method="post">

<input?type="text"?name="name"/>

<input?type="submit"?value="提交"/>

</form>

</body>

</html>

Servlet代碼：

public?class?DemoServlet?extends?HttpServlet?{

public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)

throws?ServletException,?IOException?{

String?name?=?request.getParameter("name");//獲取jsp頁面輸入的參數

System.out.println(name);

}

public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)

throws?ServletException,?IOException?{

doGet(request,?response);

}

表單提交之後，調用Servlet類的方法，通過request對象獲取jsp頁面傳入的參數值，實現數據的傳遞。