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11. jsp与servlet之间页面跳转及参数传递实例
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1.從一個jsp頁面跳轉到另一個jsp頁面時的參數傳遞
? ? (1)使用request對象獲取客戶端提交的信息
login.jsp頁面代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<form?action="getinfo.jsp">??????????????<input?type="text"?name="name">??????????????<input?type="submit"?value="Enter"?name="submit">??????????</form>??????</body>??</html>?? ? ?
getinfo.jsp頁面代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<p>獲取文本框提交的信息：??????????<%??????????????String?textContent?=?request.getParameter("name");???????????%>???????????<br/>???????????<%=textContent%>?????????????????????</p>獲取按鈕的名字：???????????<%??????????????String?buttonName?=?request.getParameter("submit");????????????%>???????????<br/>???????????<%=buttonName%>????????????????</body>??</html>?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? (2)使用session對象獲取從客戶端提交的信息
? ? session1.jsp頁面代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<form?action="session2.jsp"?method="post">??????????????請輸入您的姓名：??????????????<input?type="text"?name="thename">??????????????<input?type="submit"?value="submit">??????????</form>??????</body>??</html>?? ? ? session2.jsp通過request對象提取session1.jsp表單中的thename值,并將其保存到session對象中，session2.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????????String?name?=?request.getParameter("thename");??????????????session.setAttribute("thename",name);???????????%>???????????您的姓名是：<%=name%>???????????<p>??????????<form?action="session3.jsp?pwd=123456"?method="post">??????????????您喜歡吃什么？??????????????<input?type="text"?name="food"/>??????????????<p>??????????????<input?type="submit"?value="submit">??????????</form>??????????????</body>??</html>?? ?
? session3.jsp的主要任務是顯示結果，它從session對象提取thename的值并顯示它，以證明在多個頁面中可以通過session對象存儲和維持信息，session3.jsp代碼如下：
[java] view plain
copy <pre?name="code"?class="java"><%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????????String?food?=?request.getParameter("food");??????????????String?name?=?(String)session.getAttribute("thename");??????????????String?pwd?=?request.getParameter("pwd");???????????%>???????????您的姓名是：<%=name%>???????????<p>???????????您喜歡吃：<%=food%>???????????<p>???????????您的密碼是：<%=pwd%>??????</body>??</html></pre>??<pre></pre>??<pre></pre>??<pre></pre>??<pre></pre>??<pre></pre>??<pre></pre>??<pre></pre>??
? ? 程序運行結果如圖2所示：
? ? (3)利用隱藏域傳遞數據
? ? 使用隱藏空間記錄用戶提交日期的hiddenindex.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<form?action="hidden.jsp"?method="post"?name="form1">??????????????<!--?隱藏字段，系統時間，并轉換為毫秒數?-->??????????????<input?type="hidden"?name="time"?value="<%=new?java.util.Date()%>">??????????????<p>??????????????????請輸入您的姓名：<input?type="text"?name="name">??????????????</p>??????????????<input?type="submit"?name="submit"?value="submit">??????????</form>??????</body>??</html>?? ? ? ?顯示隱藏空間信息的hidden.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????????String?name?=?request.getParameter("name");??????????????String?date?=?request.getParameter("time");??????????%>??????????<p>您的姓名是：??????????????<%=name?%>??????????</p>??????????<p>提交時的系統時間為：??????????????<%=date?%>??????????</p>??????</body>??</html>?? ? ? 程序運行結果如下：
?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??
? ? 使用隱藏域的一個缺點是用戶可通過查看網頁源程序讀到隱藏域的值。
? ? (4)通過超鏈接傳遞數據
? ? 建立鏈接到其他分頁的超級鏈接page.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<%??????int?PageCount?=?15;??%>??<html>??????<body>??????????<table>??????????????<tr>??????????????????<td>??????????????????????<a?href=showpage.jsp?ToPage=<%=1%>>到第1頁</a>??????????????????</td>??????????????????<td>??????????????????????<a?href=showpage.jsp?ToPage=<%=PageCount%>>到最后一頁</a>??????????????????</td>??????????????</tr>??????????</table>????????????</body>??</html>?? ? ? 接收顯示分頁showpage.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????String?toPage?=?request.getParameter("ToPage");??????????out.println("第"?+?toPage?+?"頁");??????????%>??????</body>??</html>?? ? ?
運行結果如下：
? ? 2.jsp頁面傳遞參數給servlet
? ? (1)使用request對象接收參數
? ? 新建名為ForwardServlet的Servlet類，代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????????public?class?ForwardServlet?extends?HttpServlet??{??????private?static?final?long?serialVersionUID?=?1L;????????????????public?ForwardServlet()??????{??????????super();??????}????????????????????public?void?init()?throws?ServletException??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????String?name?=?request.getParameter("name");??????????String?pwd?=?request.getParameter("pwd");??????????if((name!=null?&&?!name.equals(""))?&&?(pwd!=null?&&?!pwd.equals("")))??????????{??????????????if(name.equals("mr")&&pwd.equals("123"))??????????????{??????????????????request.getRequestDispatcher("success.jsp").forward(request,?response);??????????????}??????????????else??????????????{??????????????????request.getRequestDispatcher("error.jsp").forward(request,?response);??????????????}??????????}??????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}?? ? ? 在web.xml中配置ForwardServlet類，代碼如下：
[java] view plain
copy <?xml?version="1.0"?encoding="GB2312"?>??<web-app?version="2.5"?xmlns="http://java.sun.com/xml/ns/javaee"??????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"??????xsi:schemaLocation="http:??????http:????????????<!--?配置servlet?-->??????<servlet>??????????<servlet-name>ForwardServlet</servlet-name>??????????<servlet-class>com.shi.servlet.ForwardServlet</servlet-class>??????</servlet>??????<servlet-mapping>??????????<servlet-name>ForwardServlet</servlet-name>??????????<url-pattern>/forward</url-pattern>??????</servlet-mapping>????????????<welcome-file-list>??????????<welcome-file>index.jsp</welcome-file>??????</welcome-file-list>??</web-app>?? ? ? 新建index.jsp，其中<form>中的action屬性值為Servlet類在web.xml中配置的url，提交方式為post，代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<form?action="forward"?method="post">??????????????<table?align="center">??????????????????<tr>??????????????????????<td>用戶名：</td>??????????????????????<td>??????????????????????????<input?type="text"?name="name"/>??????????????????????</td>??????????????????</tr>??????????????????<tr>??????????????????????<td>密碼：</td>??????????????????????<td>??????????????????????????<input?type="password"?name="pwd"/>??????????????????????</td>??????????????????</tr>??????????????????<tr>??????????????????????<td?colspan="2">??????????????????????????<input?type="submit"?value="登錄"/>??????????????????????</td>??????????????????</tr>??????????????</table>??????????</form>??????</body>??</html>?? ? ? 登錄成功頁面success.jsp，代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????歡迎<%=request.getParameter("name")?%>，登錄成功！??????</body>??</html>?? ? ? 程序的運行結果圖5所示：
? ? (2)使用session對象，url，form表單傳遞參數
? ? 在jsp2servlet.jsp中，分別使用request對象，session對象，url，form表單設置需要傳遞的參數，代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????session.setAttribute("testSession","Hello?session");??????????request.setAttribute("testRequest","Hello?request");??????????%>??????????<a?href="http://localhost:8080/086/jsp2servlet?hrefAction=toServlet">單擊此處</a>??????????<form?action="jsp2servlet?action=toServlet"?method="post"?name="form1">??????????????<input?type="text"?name="username"/>??????????????<input?type="submit"?value="submit"/>??????????</form>??????</body>??</html>?? ? ? 在Jsp2Servlet中接收jsp頁面中傳遞的參數并將其顯示，代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;??import?java.io.PrintWriter;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????public?class?Jsp2Servlet?extends?HttpServlet??{??????????????private?static?final?long?serialVersionUID?=?1L;????????????????public?Jsp2Servlet()??????{??????????super();??????}????????????????????public?void?init()??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????String?strSession?=?(String)request.getSession().getAttribute("testSession");?????????????????String?strRequest?=?(String)request.getAttribute("testRequest");??????????????????String?strHref?=?request.getParameter("hrefAction");??????????????????String?strForm?=?request.getParameter("action");??????????????????String?username?=?request.getParameter("username");????????????????????PrintWriter?out?=?response.getWriter();??????????out.println("<!DOCTYPE?HTML?PUBLIC?\"-//W3C//DTD?HTML?4.01?Transitional//EN\">");??????????out.println("<html>");??????????out.println("<body>");??????????out.println("保存到session中的內容：?"?+?strSession?+?"<br>");??????????out.println("保存到request中的內容："?+?strRequest?+?"<br>");??????????out.println("超鏈接中傳遞的參數值為："?+?strHref?+?"<br>");??????????out.println("form表單中傳遞的action值為："?+?strForm?+?"<br>");??????????out.println("form表單內input標簽中username的值：?"?+?username?+?"<br>");??????????out.println("</body>");??????????out.println("</html>");?????????????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}?? ? ? 程序運行結果如圖6所示：
? ? servlet無法獲取request.setAttribute()中的內容，因為在jsp2servlet.jsp中提交時，生成的一個新的request，因此無法取到jsp頁面中request.setAttribute()中設置的值。
? ? 3.從servlet到jsp頁面中傳遞參數
? ? 從servlet到jsp頁面傳遞參數，可以使用URL，request對象，session對象，新建Servlet2Jsp.java，代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????public?class?Servlet2Jsp?extends?HttpServlet??{??????????????private?static?final?long?serialVersionUID?=?1L;????????????????public?Servlet2Jsp()??????{??????????super();??????}????????????????????public?void?init()??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????String?url?=?"result.jsp?first=傳遞第一個參數&second=傳遞第二個參數";??????????String?strRequest?=?"request傳值";??????????String?strSession?=?"session傳值";??????????request.setAttribute("strRequest",?strRequest);??????????request.getSession().setAttribute("strSession",?strSession);??????????????????????????????????????????????????????????????????request.getRequestDispatcher(url).forward(request,?response);??????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}??
? ? 在web.xml中配置該servlet后，新建參數接收頁result.jsp，代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????String?strURL?=?request.getParameter("first");??????????String?strRequest?=?(String)request.getAttribute("strRequest");??????????String?strSession?=?(String)request.getSession().getAttribute("strSession");????????????????????%>??????????<p>??????????????URL中取得的屬性值為：<%=strURL%>??????????</p>????????????????<p>??????????????request中取得的屬性值為：<%=strRequest%>??????????</p>??????????<p>??????????????session中取得的屬性值為：<%=strSession%>??????????</p>??????</body>??</html>?? ? ? 程序的運行結果如圖7所示：
? ? 4.從一個servlet到另一個servlet時的參數傳遞
? ? (1)通過超鏈接和表單傳遞數據
? ? 通過超鏈接后面給定要傳遞參數的值，但長度有限制，通過超鏈接和表單傳遞數據，使用request.getParamter()方法，代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;??import?java.io.PrintWriter;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????public?class?ServletA?extends?HttpServlet??{??????????????private?static?final?long?serialVersionUID?=?1L;????????????????public?ServletA()??????{??????????super();??????}????????????????????public?void?init()??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????response.setContentType("text/html");??????????PrintWriter?out?=?response.getWriter();??????????String?name?=?"hello,?servlet";??????????out.println("<html>");??????????out.println("<body>");??????????????????????out.println("<a?href='ServletB?name="+name+"'>this?is?a?test</a>");??????????????????????out.println("<form?action='ServletB'?method='post'>");??????????????????out.println("用戶名：");??????????out.println("<input?type='text'?name='username'>");??????????out.println("<input?type='submit'?vlue='提交'>");??????????out.println("</form>");??????????out.println("</body>");??????????out.println("</html>");??????????out.flush();????????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}?? ? ? 接收servlet中傳遞參數的代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;??import?java.io.PrintWriter;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????public?class?ServletB?extends?HttpServlet??{??????????????private?static?final?long?serialVersionUID?=?1L;????????????????public?ServletB()??????{??????????super();??????}????????????????????public?void?init()??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????String?name?=?request.getParameter("name");??????????String?username?=?request.getParameter("username");??????????????????????response.setContentType("text/html;charset=gb2312");??????????PrintWriter?out?=?response.getWriter();??????????out.println("<html>");??????????out.println("<body>");??????????out.println("超鏈接傳遞的參數值為："?+?name);??????????out.println("form表單中提交的用戶名為："?+?username);??????????out.println("</body>");??????????out.println("</html>");??????????out.flush();??????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}?? ? ? 程序運行結果如圖8所示：
? ? (2)使用setAttribute()和getAttribute()方法傳遞參數
? ? 設置參數的ServletA代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;??import?java.io.PrintWriter;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????public?class?ServletA?extends?HttpServlet??{??????????????private?static?final?long?serialVersionUID?=?1L;????????????????public?ServletA()??????{??????????super();??????}????????????????????public?void?init()??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????????????????String?data?=?"This?is?a?test,?we?need?more?test?for?this";??????????request.setAttribute("strAtt",?data);??????????request.getRequestDispatcher("/ServletB").forward(request,?response);??????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}?? ? ? 獲取參數的ServletB代碼如下：
[java] view plain
copy package?com.shi.servlet;????import?java.io.IOException;??import?java.io.PrintWriter;????import?javax.servlet.ServletException;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????public?class?ServletB?extends?HttpServlet??{??????????????private?static?final?long?serialVersionUID?=?1L;????????????????public?ServletB()??????{??????????super();??????}????????????????????public?void?init()??????{}????????????????????public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????doPost(request,?response);??????}????????????????????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException??????{??????????String?strAtt?=?(String)request.getAttribute("strAtt");????????????????????response.setContentType("text/html;charset=gb2312");??????????PrintWriter?out?=?response.getWriter();??????????out.println("<html>");??????????out.println("<body>");??????????out.println("getAttribute()得到的數據值為："?+?strAtt);???????????????out.println("</body>");??????????out.println("</html>");??????????out.flush();??????}????????????????????public?void?destroy()??????{??????????super.destroy();??????}??}?? ? ? 程序的運行結果如圖9所示：
??
? ? 5.JSP頁面跳轉方法
? ? (1)RequestDispatcher.forward()
? ? 在服務器端起作用，當使用forward()時，Servlet engine傳遞HTTP請求從當前的Servlet or JSP到另外一個Servlet，JSP或普通HTML文件，即你的form提交至a.jsp,在a.jsp用到了forward()重定向到b.jsp，此時form提交的所有信息在b.jsp都可以獲得，參數自動傳遞。但forward()無法重定向至有frame的jsp文件，可以重定向至有frame的html文件，同時forward()無法再后面帶參數傳遞，比如servlet?name=tom，這樣不行，可以程序內通過response.setAttribute("name",name)來傳至下一個頁面。
? ? 重定向后瀏覽器地址欄URL不變。
? ? 通常在Servlet中使用，不在jsp中使用。
? ? (2)response.sendRedirect()
? ? 在用戶的瀏覽器端工作，sengRedirect()可以帶參數傳遞，比如servlet?name=tom傳至下個頁面，同時它可以重定向至不同的主機上，sendRedirect()可以重定向至有frame的jsp文件。
? ? 重定向后在瀏覽器地址欄上會出現重定向頁面的URL。
? ? 上述兩種方式代碼見圖7。
? ? 由于response是jsp頁面中的隱含對象，故在jsp頁面中可以用response.sendRedirect()直接實現重定位。
? ? 注意：
? ??①.使用response.sendRedirect()時，前面不能有HTML輸出
? ? 這并不是絕對的，不能有HTML輸出其實是指不能有HTML被送到了瀏覽器。事實上現在的Server都有cache機制，一般在8K(JSP SERVER)，這意味著，除非你關閉了cache，或者你用out.flush()強制刷新，那么在使用sendRedirect之前，有少量的HTML輸出也是允許的。
? ??②.response.sendRedirect()之后，應該緊跟一句return
? ? 我們已經知道response.sendRedirect()是通過瀏覽器來做轉向的，所以只有在頁面處理完成后，才會有實際的動作。既然你已經要做轉向了，那么后面的輸出還有什么意義呢？而且有可能會因為后面的輸出導致轉向失敗。
? ? 比較：
? ??①.Dispatcher.forward()是容器中控制權的轉向，在客戶端瀏覽器地址欄中不會出現轉向后的地址
? ??②.response.sendRedirect()則是完全的跳轉，瀏覽器將會得到跳轉的地址，并重新發送請求鏈接。這樣，從瀏覽器的地址欄中可以看到跳轉后的鏈接地址。
? ?前者更加高效，在前者可以滿足需要時，盡量使用RequestDispatcher.forward()方法。
? ? 注：在有些情況下，比如，需要跳轉到一個其它服務器上的資源，則必須使用HttpServletResponse.sendRedirect()方法。
? ? (3)<jsp:forward page=""/>
? ? 它的底層部分是由RequestDispatcher來實現的，因此它帶有RequestDispatcher.forward()方法的印記。
? ? 如果在之前有很多輸出，前面的輸出已使緩沖區滿，將自動輸出至客戶端，那么該語句將不起作用，這一點應該特別注意。
? ? 另外要注意：它不能改變瀏覽器地址，刷新的話會導致重復提交。
? ? 測試代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="gb2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<head>??????????<link?rel="stylesheet"?type="text/css"?href="css/style.css">??????</head>??????<body>??????????<jsp:forward?page="UpdateServlet">??????????????<jsp:param?value="list"?name="action"?/>??????????</jsp:forward>??????</body>??</html>?? ? ? 程序運行結果如圖10所示：
? ? (4)修改HTTP header的Location屬性來重定向
? ? 通過設置直接修改地址欄來實現頁面的重定向。
? ? 索引頁1.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);??????????String?newLocn?=?"2.jsp";??????????response.setHeader("Location",newLocn);??????????%>??????</body>??</html>?? ? ? 轉向頁2.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????從1.jsp跳轉至此頁??????</body>??</html>?? ? ? 程序運行結果如圖11所示：
? ?
? ? (5)JSP中實現在某頁面停留若干秒后，自動重定向到另一頁面
? ? 在jsp文件中，下面的代碼：
[java] view plain
copy <meta?http-equiv="refresh"?content="5;?url=target.jsp"?? ? ? 含義是：在5秒后正在瀏覽的頁面將會自動變為target.jsp頁。代碼中5為刷新的延遲時間，以秒為單位。target.jsp為你想轉向的目標頁，若為本頁則自動刷新本頁。
? ? 由上可知，可以通過setHeader來實現某頁面停留若干秒后，自動重定向到另一頁面。
? ? 索引頁5_1.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????<%??????????String?content?=?"5;?url=5_2.jsp";??????????response.setHeader("REFRESH",content);????????????????%>??????????5_1.jsp頁面，5秒后轉向5_2.jsp頁面。??????</body>??</html>?? ? ? 轉向頁5_2.jsp代碼如下：
[java] view plain
copy <%@?page?language="java"?import="java.util.*"?pageEncoding="GB2312"%>????<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">??<html>??????<body>??????????從5_1.jsp轉到的頁面??????</body>??</html>?? ? ? 程序運行結果如下：
總結
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