javaee-cookie响应，请求小解
1.cookie是首先由服务器向浏览器发送的
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? cookie最早来源于服务器，它像浏览器发送的响应头，如下：
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Cookie ckName = new Cookie("name", name);Cookie ckNickname = new Cookie("nickname", nickname);ckNickname.setMaxAge(365 * 24 * 3600);Cookie ckEmail = new Cookie("email", "test1@it315.org");Cookie ckPhone = new Cookie("phone", "1111111");//奇怪，针对chrome就不生成JSESSIONIDresponse.addCookie(ckName);response.addCookie(ckNickname);response.addCookie(ckEmail);response.addCookie(ckPhone);??
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2.浏览器返回cookie信息
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? ? 浏览器在收到服务器发送的cookie时，存储起来，并在每次向服务器请求时重新将cookie信息返回。如下：
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String lastNickname = null;Cookie[] cks = request.getCookies();for (int i = 0; cks != null && i < cks.length; i++) {if ("nickname".equals(cks[i].getName())) {lastNickname = cks[i].getValue();break;}}?
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? ?或者也可以这么取
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String cookieHeader = request.getHeader("Cookie");??
? ?可以通过：http://localhost:8080/Test_servlet/ch7/CookieServlet1?name=admin&nickname=nick_admin
查看效果。
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3.Cookie源代码
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? ??Cookie类，真是难得一见的类，不是接口。
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package javax.servlet.http;import java.text.MessageFormat;import java.util.ResourceBundle;public class Cookie implements Cloneable{ private static final String LSTRING_FILE = "javax.servlet.http.LocalStrings"; private static ResourceBundle lStrings = ResourceBundle.getBundle("javax.servlet.http.LocalStrings"); private String name; private String value; private String comment; private String domain; private int maxAge = -1; private String path; private boolean secure; private int version = 0; private static final String tspecials = ",; "; public Cookie(String name, String value) { if ((!(isToken(name))) || (name.equalsIgnoreCase("Comment")) || (name.equalsIgnoreCase("Discard")) || (name.equalsIgnoreCase("Domain")) || (name.equalsIgnoreCase("Expires")) || (name.equalsIgnoreCase("Max-Age")) || (name.equalsIgnoreCase("Path")) || (name.equalsIgnoreCase("Secure")) || (name.equalsIgnoreCase("Version")) || (name.startsWith("$"))) { String errMsg = lStrings.getString("err.cookie_name_is_token"); Object[] errArgs = new Object[1]; errArgs[0] = name; errMsg = MessageFormat.format(errMsg, errArgs); throw new IllegalArgumentException(errMsg); } this.name = name; this.value = value; } public void setComment(String purpose) { this.comment = purpose; } public String getComment() { return this.comment; } public void setDomain(String pattern) { this.domain = pattern.toLowerCase(); } public String getDomain() { return this.domain; } public void setMaxAge(int expiry) { this.maxAge = expiry; } public int getMaxAge() { return this.maxAge; } public void setPath(String uri) { this.path = uri; } public String getPath() { return this.path; } public void setSecure(boolean flag) { this.secure = flag; } public boolean getSecure() { return this.secure; } public String getName() { return this.name; } public void setValue(String newValue) { this.value = newValue; } public String getValue() { return this.value; } public int getVersion() { return this.version; } public void setVersion(int v) { this.version = v; } private boolean isToken(String value) { int len = value.length(); for (int i = 0; i < len; ++i) { char c = value.charAt(i); if ((c < ' ') || (c >= '') || (",; ".indexOf(c) != -1)) return false; } return true; } public Object clone() { try { return super.clone(); } catch (CloneNotSupportedException e) { throw new RuntimeException(e.getMessage()); } }}?
参考：《深入体验Java_Web开发内幕-核心基础\》
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