怎么让request.getrequestedsessionid 是空值

怎么让request.getrequestedsessionid 是空值

去的是从客户端带来的session的id号 session由cookie放入客户端 所以第一次发起请求时 这个值为空因为客户端没有cookie

1. request请求象用： public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html; charset = utf-8"); this.response = response; out = this.response.getWriter(); println(" "); //1. 获取请求式、处理乱码问题 String method = request.getMethod(); //servletRequest request.setCharacterEncoding("utf-8"); //1. 获取请求体编码式 String characterEncoding = request.getCharacterEncoding(); println("getCharacterEncoding = " + characterEncoding); //2. get body length int contentLength = request.getContentLength(); println("getContentLength = " + contentLength); //3. MIME type String mimeType = request.getContentType(); println("getContentType = " + mimeType); //4. 接收请求接口 Internet Protocol (IP) 址 String ip = request.getLocalAddr(); println("getLocalAddr = " + ip); //5. 基于 Accept-Language 返客户端用接受内容首选 Locale 客户端语言环境 Locale locale = request.getLocale(); println("getLocale = " + locale); //6. 所语言环境 Enumeration locales = request.getLocales(); while(locales.hasMoreElements()){ Locale temp = locales.nextElement(); println("\n Locales = " + temp); } //7. 接收请求 Internet Protocol (IP) 接口主机名 String localName = request.getLocalName(); println("localName = " + localName); //8. 接收请求接口 Internet Protocol (IP) 端口号 int localPort = request.getLocalPort(); println("localPort = " + localPort); //9. 返请求使用协议名称版本 String protocol = request.getProtocol(); println("protocol = " + protocol); //10. 读取请求文信息 BufferedReader reader = request.getReader(); println("getReader = " + reader.toString()); //11. 发送请求客户端 String remoteAddr = request.getRemoteAddr(); println("RemoteAddr = " + remoteAddr); //12. 发送请求客户主机 String remoteHost = request.getRemoteHost(); println("RemoteHost = " + remoteHost); //13. 发送请求客户主机端口 int remotePort = request.getRemotePort(); println("RemotePort = " + remotePort); //14. 返用于发请求案名称例：http 、 https 、 ftp String scheme = request.getScheme(); println("Scheme = " + scheme); //15. 返请求发送服务器主机名Host值":"()前部值 或者解析服务器名称或服务器IP址 String serverName = request.getServerName(); println("ServerName = " + serverName); //16. 返请求发送端口"Host"值":" （）部值或者接受客户端连接服务器端口 int serverPort = request.getServerPort(); println("ServerPort = " + serverPort); //17. 返boolean值指示请求否使用安全通道(比HTTPS) 发 boolean secure = request.isSecure(); println("isSecure = " + secure); // ServletRequest 接口提供 // HttpServletRequest 接口提供 String authType = request.getAuthType(); println("authType = " + authType); //19. getDateHeader ?? request.getDateHeader(""); //20. 返请求包含所名称枚举 Enumeration headerNames = request.getHeaderNames(); println(""); while(headerNames.hasMoreElements()){ String name = headerNames.nextElement(); println(" headerNmea = " + name + ";　　　getHeader = " + request.getHeader(name)); } println(""); //21. int形式返指定请求值 ??? request.getIntHeader("123"); //22. 返与客户端发请求发送URL相关联额外路径信息 String pathInfo = request.getPathInfo(); println("PathInfo = " + pathInfo); //23. 返包含请求RUL路径面查询字符串没查询字符串返null String remoteUser = request.getRemoteUser(); println("RemoteUser = " + remoteUser); //24. 返客户端制定ID String requestedSessionId = request.getRequestedSessionId(); println("requestSessionId = " + requestedSessionId); //25. 返请求调用servletURL部 String servletPath = request.getServletPath(); println("servletPath = " + servletPath); //26. 返与请求关联前HttpSession没前并且参数true,则返新 HttpSession session = request.getSession(true); println("getSession(true) = " + session); //27. 返包含前已经验证用户名称java.security.Principal象用户没经验证则该返null Principal userPrincipal = request.getUserPrincipal(); println("userPrincipal = " + userPrincipal); //28. 检查id否作Cook进入 boolean sessionIdFromCookie = request.isRequestedSessionIdFromCookie(); println("sessionIdFromCookie = " + sessionIdFromCookie); //29. 检查请求ID否作请求URL部进入 boolean sessionIdFromURL = request.isRequestedSessionIdFromURL(); println("sessionIdFormURL = " + sessionIdFromURL); //30. println(""); out.flush(); out.close(); } public void println(Object obj){ this.response.setContentType("text/html;charset=utf-8"); try { out.println("1. "); out.println(obj); out.println("\n"); } catch (Exception e) { e.printStackTrace(); } } 2. 运行结 getCharacterEncoding = utf-8 getContentLength = -1 getContentType = null getLocalAddr = 127.0.0.1 getLocale = zh_CN Locales = zh_CN Locales = zh Locales = en_US Locales = en localName = lm.licenses.adobe.com localPort = 8080 protocol = HTTP/1.1 getReader = org.apache.catalina.connector.CoyoteReader@17b8d3d RemoteAddr = 127.0.0.1 RemoteHost = 127.0.0.1 RemotePort = 57814 Scheme = http ServerName = localhost ServerPort = 8080 isSecure = false authType = null headerNmea = host;　　　getHeader = localhost:8080 headerNmea = user-agent;　　　getHeader = Mozilla/5.0 (Windows NT 6.1; rv:32.0) Gecko/20110101 Firefox/32.0 headerNmea = accept;　　　getHeader = text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 headerNmea = accept-language;　　　getHeader = zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3 headerNmea = accept-encoding;　　　getHeader = gzip, deflate headerNmea = cookie;　　　getHeader = JSESSIONID=30256CEB48E2BF6050BF6E122635EAC4 headerNmea = connection;　　　getHeader = keep-alive PathInfo = null RemoteUser = null requestSessionId = 30256CEB48E2BF6050BF6E122635EAC4 servletPath = /req getSession(true) = org.apache.catalina.session.StandardSessionFacade@1fcf1ba userPrincipal = null sessionIdFromCookie = true sessionIdFormURL = false

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