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Javascript 在JSP中通过会话传递值

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Javascript 在JSP中通过会话传递值,javascript,java,jquery,jsp,Javascript,Java,Jquery,Jsp,我有4个jsp表单名Sample1.jsp、Sample2.jsp、Sample3.jsp、Sample4.jsp 我想通过会话将值从一个页面转移到另一个页面 我用了这个方法 Sample1.jsp <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Conte

我有4个jsp表单名Sample1.jsp、Sample2.jsp、Sample3.jsp、Sample4.jsp 我想通过会话将值从一个页面转移到另一个页面 我用了这个方法

Sample1.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="sample2.jsp" method="post">
            <h1>Page1</h1>
            <input type="text" name="name">
            <input type="submit" value="Go">
        </form>
    </body>
</html>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page 4</h1>
        <%String name =(String)session.getAttribute("name");
        out.println(name);%>

    </body>
</html>

<body>
    <form action="sample2.jsp" method="post">
        <h1>Page1</h1>
        <input type="text" name="name">
        <input type="submit" value="Go">
    </form>
</body>

<body>
    <h1>page2</h1>
    <%
        String name = request.getParameter("name");
        session.setAttribute("name",name);
        //out.println(name);
        //response.sendRedirect("sample3.jsp");

    %>
    <a href="sample3.jsp"><%out.println(name);%></a>

</body>

<body>
    <h1>Page 3</h1>
    <%
        String lname = (String)session.getAttribute("name");
        //out.println(lname+"\n"); 
        //session.setAttribute("lname",lname);
    %>

    <a href="sample4.jsp"><%out.println(lname);%></a> 
</body>

<body>
    <h1>page 4</h1>
    <%String name =(String)session.getAttribute("name");
    out.println(name);%>

</body>


JSP页面
第1页
Sample2.jsp 从Sample1.jsp获取值名，并重定向到sample3.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page2</h1>
        <%
            String name = request.getParameter("name");
            session.setAttribute("name",name);
            out.println(name);
            //response.sendRedirect("sample3.jsp");
            request.getRequestDispatcher("sample3.jsp").forward(request, response);
        %>
    </body>
</html>


JSP页面
第2页
Sample3.jsp 从Sample2.jsp获取了值名，并且没有在Sample3.jsp中显示锚定标记超链接，直接跳转到Sample4.jsp


JSP页面
第3页
代码直接跳转到Sample4.jsp，而不允许用户单击表单Sample3.jsp中锚定标记中的超链接。希望停止页面并允许用户单击并向前移动

Sample4.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="sample2.jsp" method="post">
            <h1>Page1</h1>
            <input type="text" name="name">
            <input type="submit" value="Go">
        </form>
    </body>
</html>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page 4</h1>
        <%String name =(String)session.getAttribute("name");
        out.println(name);%>

    </body>
</html>

<body>
    <form action="sample2.jsp" method="post">
        <h1>Page1</h1>
        <input type="text" name="name">
        <input type="submit" value="Go">
    </form>
</body>

<body>
    <h1>page2</h1>
    <%
        String name = request.getParameter("name");
        session.setAttribute("name",name);
        //out.println(name);
        //response.sendRedirect("sample3.jsp");

    %>
    <a href="sample3.jsp"><%out.println(name);%></a>

</body>

<body>
    <h1>Page 3</h1>
    <%
        String lname = (String)session.getAttribute("name");
        //out.println(lname+"\n"); 
        //session.setAttribute("lname",lname);
    %>

    <a href="sample4.jsp"><%out.println(lname);%></a> 
</body>

<body>
    <h1>page 4</h1>
    <%String name =(String)session.getAttribute("name");
    out.println(name);%>

</body>


JSP页面
第4页

您的
中的问题

这个问题的解决办法是：

试试这个

Web.xml:


<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
     version="3.1">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
   <welcome-file>sample1.jsp</welcome-file>
</welcome-file-list>


</web-app>




30
sample1.jsp


Sample1.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="sample2.jsp" method="post">
            <h1>Page1</h1>
            <input type="text" name="name">
            <input type="submit" value="Go">
        </form>
    </body>
</html>



<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page 4</h1>
        <%String name =(String)session.getAttribute("name");
        out.println(name);%>

    </body>
</html>



<body>
    <form action="sample2.jsp" method="post">
        <h1>Page1</h1>
        <input type="text" name="name">
        <input type="submit" value="Go">
    </form>
</body>



<body>
    <h1>page2</h1>
    <%
        String name = request.getParameter("name");
        session.setAttribute("name",name);
        //out.println(name);
        //response.sendRedirect("sample3.jsp");

    %>
    <a href="sample3.jsp"><%out.println(name);%></a>

</body>



<body>
    <h1>Page 3</h1>
    <%
        String lname = (String)session.getAttribute("name");
        //out.println(lname+"\n"); 
        //session.setAttribute("lname",lname);
    %>

    <a href="sample4.jsp"><%out.println(lname);%></a> 
</body>



<body>
    <h1>page 4</h1>
    <%String name =(String)session.getAttribute("name");
    out.println(name);%>

</body>




第1页


Sample2.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="sample2.jsp" method="post">
            <h1>Page1</h1>
            <input type="text" name="name">
            <input type="submit" value="Go">
        </form>
    </body>
</html>



<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page 4</h1>
        <%String name =(String)session.getAttribute("name");
        out.println(name);%>

    </body>
</html>



<body>
    <form action="sample2.jsp" method="post">
        <h1>Page1</h1>
        <input type="text" name="name">
        <input type="submit" value="Go">
    </form>
</body>



<body>
    <h1>page2</h1>
    <%
        String name = request.getParameter("name");
        session.setAttribute("name",name);
        //out.println(name);
        //response.sendRedirect("sample3.jsp");

    %>
    <a href="sample3.jsp"><%out.println(name);%></a>

</body>



<body>
    <h1>Page 3</h1>
    <%
        String lname = (String)session.getAttribute("name");
        //out.println(lname+"\n"); 
        //session.setAttribute("lname",lname);
    %>

    <a href="sample4.jsp"><%out.println(lname);%></a> 
</body>



<body>
    <h1>page 4</h1>
    <%String name =(String)session.getAttribute("name");
    out.println(name);%>

</body>




第2页


Sample3.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="sample2.jsp" method="post">
            <h1>Page1</h1>
            <input type="text" name="name">
            <input type="submit" value="Go">
        </form>
    </body>
</html>



<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page 4</h1>
        <%String name =(String)session.getAttribute("name");
        out.println(name);%>

    </body>
</html>



<body>
    <form action="sample2.jsp" method="post">
        <h1>Page1</h1>
        <input type="text" name="name">
        <input type="submit" value="Go">
    </form>
</body>



<body>
    <h1>page2</h1>
    <%
        String name = request.getParameter("name");
        session.setAttribute("name",name);
        //out.println(name);
        //response.sendRedirect("sample3.jsp");

    %>
    <a href="sample3.jsp"><%out.println(name);%></a>

</body>



<body>
    <h1>Page 3</h1>
    <%
        String lname = (String)session.getAttribute("name");
        //out.println(lname+"\n"); 
        //session.setAttribute("lname",lname);
    %>

    <a href="sample4.jsp"><%out.println(lname);%></a> 
</body>



<body>
    <h1>page 4</h1>
    <%String name =(String)session.getAttribute("name");
    out.println(name);%>

</body>




第3页


Sample4.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="sample2.jsp" method="post">
            <h1>Page1</h1>
            <input type="text" name="name">
            <input type="submit" value="Go">
        </form>
    </body>
</html>



<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>page 4</h1>
        <%String name =(String)session.getAttribute("name");
        out.println(name);%>

    </body>
</html>



<body>
    <form action="sample2.jsp" method="post">
        <h1>Page1</h1>
        <input type="text" name="name">
        <input type="submit" value="Go">
    </form>
</body>



<body>
    <h1>page2</h1>
    <%
        String name = request.getParameter("name");
        session.setAttribute("name",name);
        //out.println(name);
        //response.sendRedirect("sample3.jsp");

    %>
    <a href="sample3.jsp"><%out.println(name);%></a>

</body>



<body>
    <h1>Page 3</h1>
    <%
        String lname = (String)session.getAttribute("name");
        //out.println(lname+"\n"); 
        //session.setAttribute("lname",lname);
    %>

    <a href="sample4.jsp"><%out.println(lname);%></a> 
</body>



<body>
    <h1>page 4</h1>
    <%String name =(String)session.getAttribute("name");
    out.println(name);%>

</body>




第4页

不要在您的
中使用RequestDispatcher
将其添加到sample3.jsp request.getRequestDispatcher（“sample4.jsp”）.forward（请求，响应）；我应用了request.getRequestDispatcher，但它跳到sample4.jsp，而没有显示或单击Sample3.jsp中锚定标记中的lname值。我应用了此功能，但它跳到sample4.jsp，而没有显示或单击Sample3.jsp中锚定标记中的lname值。我还希望sample3.jsp显示输出，当我在sample3.jsp中单击锚定标记中的超链接时，它应该转到sample4.jspI。是的，谢谢，它成功了，但从第一页直接跳到最后一页（第四页），而不在第三页停止。有没有办法处理它。它不起作用，因为第4页上的变量名得到空值。直到第3页它才传递值，但无法在第4页传递。我认为'request.getRequestDispatcher（“sample3.jsp”）.forward（请求，响应）；'这是正确的选择。但问题是它并没有停在第3页上，因为有一个锚定标签为第4页提供href。它应该停在那里，让用户单击该href''并移动到第4页。您是否添加了sample3.jsp？它在我的系统中运行良好。仍然是相同的问题名称值没有从第2页转移到第3页。我认为这样做不会将值从一个jsp页面转移到另一个页面。。。。。！！！请记住，您正在使用会话。谢谢您的回答，但通过在第3页上使用普通超链接，然后移动到第4页，然后在名称中显示空值variable@Salik47是的，当您使用JSP页面时，会话对象将被隐式创建，因此，为了防止在调用特定页面时创建新的会话对象，您可以对页面使用
声明，以便在第4页中声明其显示错误：String name=（String）session.getAttribute（“name”）；^符号：变量会话位置：类sample4\u jsp 1error@Salik47不要使用
简单的超链接可以很好地工作，请评论我您所写的产生空值的内容我在第3页和第4页中使用了这个，我在第4页的name变量中得到了空值