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| 处理Cookie |
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// cookieReader.jsp
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<body>
<c:choose>
<c:when test="${empty cookie}" >
<h2>We did not find any cookies in the request</h2>
</c:when>
<c:otherwise>
<h2>The name and value of each found cookie</h2>
<c:forEach var="cookieVal" items="${cookie}">
<strong>Cookie name:</strong> <c:out value="${cookieVal.key}" /><br>
<strong>Cookie value:</strong> <c:out value="${cookieVal.value.value}" /><br><br>
</c:forEach>
</c:otherwise>
</c:choose>
</body>
</html>
// cookieSetter.jsp
<jsp:useBean id="cookieBean" class="com.java2s.CookieBean" />
<jsp:setProperty name="cookieBean" property="name" value="bakedcookie" />
<jsp:setProperty name="cookieBean" property="maxAge" value="<%=(365*24*60*60) %>" />
<jsp:setProperty name="cookieBean" property="path" value="<%= request.getContextPath() %>" />
<jsp:setProperty name="cookieBean" property="cookieHeader" value="<%= response %>" />
<html>
<head><title>Cookie Maker</title></head>
<body>
<h2>Here is information about the new cookie</h2>
Name: <jsp:getProperty name="cookieBean" property="name" /><br>
Value: <jsp:getProperty name="cookieBean" property="value" /><br>
Path: <jsp:getProperty name="cookieBean" property="path" />
</body>
</html>
// put the class file to WEB-INF/classes/com/java2s
//CookieBean.java
package com.java2s;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
public class CookieBean {
private Cookie cookie = null;
public CookieBean() {
}
public void setName(String name) {
if (name == null || (name.equals("")))
throw new IllegalArgumentException("Invalid cookie name set in: "
+ getClass().getName());
cookie = new Cookie(name, "" + new java.util.Date().getTime());
}
public void setValue(String value) {
if (value == null || (value.equals("")))
throw new IllegalArgumentException("Invalid cookie value set in: "
+ getClass().getName());
if (cookie != null)
cookie.setValue(value);
}
public void setMaxAge(int maxAge) {
if (cookie != null)
cookie.setMaxAge(maxAge);
}
public void setPath(String path) {
if (path == null || (path.equals("")))
throw new IllegalArgumentException("Invalid cookie path set in: "
+ getClass().getName());
if (cookie != null)
cookie.setPath(path);
}
public void setCookieHeader(HttpServletResponse response) {
if (response == null)
throw new IllegalArgumentException(
"Invalid HttpServletResponse set in: "
+ getClass().getName());
if (cookie != null)
response.addCookie(cookie);
}
public String getName() {
if (cookie != null)
return cookie.getName();
else
return "unavailable";
}
public String getValue() {
if (cookie != null)
return cookie.getValue();
else
return "unavailable";
}
public String getPath() {
if (cookie != null)
return cookie.getPath();
else
return "unavailable";
}
}
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