标签：tomcat session cookie 源码 cookies
在看本文之前,请先查阅相关Session与Cookie的资料。uml图如下:
StandardSession.java
/**
* The facade associated with this session. NOTE: This value is not
* included in the serialized version of this object.
*/
private transient StandardSessionFacade facade = null;
Catalina通过一个叫session管理器的组件来管理建立的Session对象,该组件由org.apache.catalina.Manager接口表示。Session管理器与一个Context级别的容器相关联。Session管理器组件负责管理Session对象,例如创建和删除Session对象。在catalina中,ManagerBase是一个工具类,提供了最基本的一些功能。
// add a Manager
Manager manager = new StandardManager();
context.setManager(manager);我们的servlet如下:import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
public class SessionServlet extends HttpServlet {
private static final long serialVersionUID = -446310114281616885L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("SessionServlet -- service");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>SessionServlet</title></head>");
out.println("<body>");
String value = request.getParameter("value");
HttpSession session = request.getSession(true);
out.println("<br>the previous value is " +
(String) session.getAttribute("value"));
out.println("<br>the current value is " + value);
session.setAttribute("value", value);
out.println("<br><hr>");
out.println("<form>");
out.println("New Value: <input name=value>");
out.println("<input type=submit>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
}
}编译好的servletclass文件放在什么地方,还用我说吗?如果不知道就先看看前面几章吧。先上最终的结果图:
先输入33然后15最后57的效果图
parseHeaders方法下:
if (name.equals("cookie")) {
Cookie cookies[] = RequestUtil.parseCookieHeader(value);
for (int i = 0; i < cookies.length; i++) {
if (cookies[i].getName().equals("jsessionid")) {
// Override anything requested in the URL
if (!request.isRequestedSessionIdFromCookie()) {
// Accept only the first session id cookie
request.setRequestedSessionId(cookies[i].getValue());
request.setRequestedSessionCookie(true);
request.setRequestedSessionURL(false);
}
}
request.addCookie(cookies[i]);
}
}第一次请求SessionServlet的时候,自然没有jsessionid,RequestedSessionId也为空,就要manager.createSession() if (requestedSessionId != null) {
try {
session = manager.findSession(requestedSessionId);
} catch (IOException e) {
session = null;
}
if ((session != null) && !session.isValid())
session = null;
if (session != null) {
return (session.getSession());
}
}how tomcat works 读书笔记九 Session管理
标签：tomcat session cookie 源码 cookies
原文地址：http://blog.csdn.net/dlf123321/article/details/40980895
