📄 aspcool_com--九、处理cookie.htm
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<BR> package hall; <BR>
<BR> import java.io.*; <BR> import
javax.servlet.*; <BR> import javax.servlet.http.*;
<BR> import java.net.*; <BR>
<BR> public class SearchEnginesFrontEnd extends
HttpServlet { <BR> public void doGet(HttpServletRequest
request, <BR> HttpServletResponse response)
<BR> throws ServletException, IOException {
<BR> Cookie[] cookies = request.getCookies();
<BR> String searchString = <BR>
ServletUtilities.getCookieValue(cookies, <BR>
"searchString", <BR> "Java Programming");
<BR> String numResults = <BR>
ServletUtilities.getCookieValue(cookies, <BR>
"numResults", <BR> "10"); <BR> String
searchEngine = <BR>
ServletUtilities.getCookieValue(cookies, <BR>
"searchEngine", <BR> "google"); <BR>
response.setContentType("text/html"); <BR> PrintWriter
out = response.getWriter(); <BR> String title =
"Searching the Web"; <BR>
out.println(ServletUtilities.headWithTitle(title) + <BR>
"＜BODY BGCOLOR=＼"#FDF5E6＼"＞＼n" + <BR> "＜H1
ALIGN=＼"CENTER＼"＞Searching the Web＜/H1＞＼n" + <BR> "＼n" +
<BR> "＜FORM
ACTION=＼"/servlet/hall.CustomizedSearchEngines＼"＞＼n" +
<BR> "＜CENTER＞＼n" + <BR> "Search String:＼n"
+ <BR> "＜INPUT TYPE=＼"TEXT＼" NAME=＼"searchString＼"＼n" +
<BR> " VALUE=＼"" + searchString + "＼"＞＜BR＞＼n" +
<BR> "Results to Show Per Page:＼n" + <BR>
"＜INPUT TYPE=＼"TEXT＼" NAME=＼"numResults＼"＼n" + <BR> "
VALUE=" + numResults + " SIZE=3＞＜BR＞＼n" + <BR> "＜INPUT
TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" + <BR> "
VALUE=＼"google＼"" + <BR> checked("google", searchEngine)
+ "＞＼n" + <BR> "Google |＼n" + <BR> "＜INPUT
TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" + <BR> "
VALUE=＼"infoseek＼"" + <BR> checked("infoseek",
searchEngine) + "＞＼n" + <BR> "Infoseek |＼n" +
<BR> "＜INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
<BR> " VALUE=＼"lycos＼"" + <BR>
checked("lycos", searchEngine) + "＞＼n" + <BR> "Lycos
|＼n" + <BR> "＜INPUT TYPE=＼"RADIO＼"
NAME=＼"searchEngine＼"＼n" + <BR> " VALUE=＼"hotbot＼"" +
<BR> checked("hotbot", searchEngine) + "＞＼n" +
<BR> "HotBot＼n" + <BR> "＜BR＞＼n" +
<BR> "＜INPUT TYPE=＼"SUBMIT＼" VALUE=＼"Search＼"＞＼n" +
<BR> "＜/CENTER＞＼n" + <BR> "＜/FORM＞＼n" +
<BR> "＼n" + <BR> "＜/BODY＞＼n" +
<BR> "＜/HTML＞＼n"); <BR> } <BR>
<BR> private String checked(String name1, String name2)
{ <BR> if (name1.equals(name2)) <BR>
return(" CHECKED"); <BR> else <BR>
return(""); <BR> } <BR> } <BR>
<BR> <BR> <BR>
<BR> CustomizedSearchEngines.java <BR>
<BR> 前面的SearchEnginesFrontEnd
Servlet把数据发送到CustomizedSearchEngines
Servlet。本例在许多方面与前面介绍HTTP状态代码时的例子相似，区别在于，本例除了要构造一个针对搜索引擎的URL并向用户发送一个重定向应答之外，还要发送保存用户数据的Cookies。
<BR> package hall; <BR>
<BR> import java.io.*; <BR> import
javax.servlet.*; <BR> import javax.servlet.http.*;
<BR> import java.net.*; <BR>
<BR> public class CustomizedSearchEngines extends
HttpServlet { <BR> public void doGet(HttpServletRequest
request, <BR> HttpServletResponse response)
<BR> throws ServletException, IOException {
<BR> <BR> String searchString =
request.getParameter("searchString"); <BR> Cookie
searchStringCookie = <BR> new
LongLivedCookie("searchString", searchString); <BR>
response.addCookie(searchStringCookie); <BR>
searchString = URLEncoder.encode(searchString); <BR>
String numResults = request.getParameter("numResults");
<BR> Cookie numResultsCookie = <BR> new
LongLivedCookie("numResults", numResults); <BR>
response.addCookie(numResultsCookie); <BR> String
searchEngine = request.getParameter("searchEngine");
<BR> Cookie searchEngineCookie = <BR> new
LongLivedCookie("searchEngine", searchEngine); <BR>
response.addCookie(searchEngineCookie); <BR>
SearchSpec[] commonSpecs = SearchSpec.getCommonSpecs();
<BR> for(int i=0; i＜commonSpecs.length; i++) {
<BR> SearchSpec searchSpec = commonSpecs[i];
<BR> if (searchSpec.getName().equals(searchEngine)) {
<BR> String url = <BR>
searchSpec.makeURL(searchString, numResults); <BR>
response.sendRedirect(url); <BR> return;
<BR> } <BR> } <BR>
response.sendError(response.SC_NOT_FOUND, <BR> "No
recognized search engine specified."); <BR> }
<BR> <BR> public void
doPost(HttpServletRequest request, <BR>
HttpServletResponse response) <BR> throws
ServletException, IOException { <BR> doGet(request,
response); <BR> } <BR> } <BR>
<BR> <BR> <BR>
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<TD vAlign=top width="50%">前1篇 <A
href="http://www.aspcool.com/lanmu/dot.asp?ID=338&bbsuser=jsp"
target=_blank>八、设置HTTP应答头</A> <BR>前2篇 <A
href="http://www.aspcool.com/lanmu/dot.asp?ID=337&bbsuser=jsp"
target=_blank>七、HTTP应答状态</A> <BR>前3篇 <A
href="http://www.aspcool.com/lanmu/dot.asp?ID=336&bbsuser=jsp"
target=_blank>六、访问CGI变量</A> <BR>前4篇 <A
href="http://www.aspcool.com/lanmu/dot.asp?ID=335&bbsuser=jsp"
target=_blank>五、读取HTTP请求头</A> <BR></TD>
<TD vAlign=top width="50%">后1篇 <A
href="http://www.aspcool.com/lanmu/dot.asp?ID=340&bbsuser=jsp"
target=_blank>十、会话状态</A> <BR>后2篇 <A
href="http://www.aspcool.com/lanmu/dot.asp?ID=341&bbsuser=jsp"
target=_blank>十一、JSP及语法概要</A> <BR></TD></TR></TBODY></TABLE><BR>
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