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@nalan90 2018-06-29T11:16:07.000000Z 字数 3748 阅读 686

五、JSP的include指令

JAVAEE开发

内容
include 指令
  1. <%@ include file="URL"%>
  1. ## date.jsp
  2. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  3. <%@ page import="java.text.SimpleDateFormat" %>
  4. <%@ page import="java.util.Date" %>
  5. <%
  6.     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  7.     String current = sdf.format(new Date());
  8.     out.println(current);
  9. %>
  11. ## include_command.jsp
  12. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  14. <html>
  15. <head>
  16.     <title>Title</title>
  17. </head>
  18. <body>
  19.     <h1>include指令</h1>
  20.     <hr>
  21.     <%@ include file="date.jsp" %>
  22. </body>
  23. </html>
include动作
  1. <jsp:include page="URL" flush="true|false" />
  1. ## date.jsp
  2. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  3. <%@ page import="java.text.SimpleDateFormat" %>
  4. <%@ page import="java.util.Date" %>
  5. <%
  6.     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  7.     String current = sdf.format(new Date());
  8.     out.println(current);
  9. %>
  11. ## include_action.jsp
  12. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  13. <html>
  14. <head>
  15.     <title>Title</title>
  16. </head>
  17. <body>
  18.     <h1>include动作</h1>
  19.     <hr>
  20.     <jsp:include page="date.jsp" flush="true"/>
  21. </body>
  22. </html>
include指令与include动作比较
forward动作
  1. <jsp:forward page="URL"/>
  2. request.getRequestDispatcher("/url").forward(request, response);
  3. 两者等价
  1. ## login.jsp
  2. <%@ page contentType="text/html;charset=UTF-8" import="java.net.*" language="java" %>
  3. <html>
  4. <head>
  5.     <title>登录页面</title>
  6. </head>
  7. <body>
  9.     <h1>用户登录</h1>
  10.     <hr>
  11.     <form action="forward_action.jsp" name="loginForm" method="post">
  12.         用户名: <input type="text" name="username" ><br>
  13.         密码：<input type="password" name="password" ><br>
  14.         <input type="submit" value="login">
  15.     </form>
  16. </body>
  17. </html>
  19. ## forward_action.jsp
  20. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  21. <%--<jsp:forward page="user.jsp"/>--%>
  23. <%
  24.     request.getRequestDispatcher("user.jsp").forward(request, response);
  25. %>
  27. ## user.jsp
  28. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  29. <html>
  30. <head>
  31.     <title>Title</title>
  32. </head>
  33. <body>
  34.     <h1>用户资料</h1>
  36.     <%
  37.         request.setCharacterEncoding("utf-8");
  38.         String username = "";
  39.         String password = "";
  41.         if (request.getParameter("username") != null) {
  42.             username = request.getParameter("username");
  43.         }
  45.         if (request.getParameter("password") != null) {
  46.             password = request.getParameter("password");
  47.         }
  48.     %>
  50.     用户名：<%=username%><br>
  51.     密码:<%=password%><br>
  52. </body>
  53. </html>
param动作
  1. <jsp:param name="参数名" value="参数值"/>
  2. 常常与<jsp:forward>一起使用，作为其子标签
  1. ## login.jsp
  2. <%@ page contentType="text/html;charset=UTF-8" import="java.net.*" language="java" %>
  3. <html>
  4. <head>
  5.     <title>登录页面</title>
  6. </head>
  7. <body>
  9.     <h1>用户登录</h1>
  10.     <hr>
  11.     <form action="dologin.jsp" name="loginForm" method="post">
  12.         用户名: <input type="text" name="username" ><br>
  13.         密码：<input type="password" name="password" ><br>
  14.         <input type="submit" value="login">
  15.     </form>
  16. </body>
  17. </html>
  20. ## dologin.jsp
  21. <%@ page contentType="text/html;charset=UTF-8" import="java.net.*" language="java" %>
  22. <jsp:forward page="user.jsp">
  23.     <jsp:param name="username" value="zhangshuang"/>
  24.     <jsp:param name="email" value="admin@admin.com"/>
  25. </jsp:forward>
  28. ## user.jsp
  29. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  30. <html>
  31. <head>
  32.     <title>Title</title>
  33. </head>
  34. <body>
  35.     <h1>用户资料</h1>
  37.     <%
  38.         request.setCharacterEncoding("utf-8");
  39.         String username = "";
  40.         String password = "";
  41.         String email = "";
  43.         if (request.getParameter("username") != null) {
  44.             username = request.getParameter("username");
  45.         }
  47.         if (request.getParameter("password") != null) {
  48.             password = request.getParameter("password");
  49.         }
  51.         if (request.getParameter("email") != null) {
  52.             email = request.getParameter("email");
  53.         }
  54.     %>
  56.     用户名: <%=username%><br>
  57.     密码: <%=password%><br>
  58.     邮箱: <%=email%>
  59. </body>
  60. </html>
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