1. request请求对象常用方法：
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("<ol>"); //1. 获取请求方式、处理乱码问题 String method = request.getMethod(); //servletRequest中的方法 request.setCharacterEncoding("utf-8"); //1. 获取请求体的编码方式 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. 接收请求的接口的 Internet Protocol (IP) 地址 String ip = request.getLocalAddr(); println("getLocalAddr = " + ip); //5. 基于 Accept-Language 头，返回客户端将用来接受内容的首选 Locale 客户端语言环境 Locale locale = request.getLocale(); println("getLocale = " + locale); //6. 所有的语言环境 Enumeration<Locale> locales = request.getLocales(); while(locales.hasMoreElements()){ Locale temp = locales.nextElement(); println("\n Locales = " + temp); } //7. 接收请求的 Internet Protocol (IP) 接口的主机名 String localName = request.getLocalName(); println("localName = " + localName); //8. 接收请求的接口的 Internet Protocol (IP) 端口号 int localPort = request.getLocalPort(); println("localPort = " + localPort); //9. 返回请求使用的协议的名称和版本 String protocol = request.getProtocol(); println("protocol = " + protocol); //10. 读取请求正文信息 BufferedReader reader = request.getReader(); println("getReader = " + reader.toString()); //11. 发送请求的客户端 String remoteAddr = request.getRemoteAddr(); println("RemoteAddr = " + remoteAddr); //12. 发送请求的客户主机 String remoteHost = request.getRemoteHost(); println("RemoteHost = " + remoteHost); //13. 发送请求的客户主机端口 int remotePort = request.getRemotePort(); println("RemotePort = " + remotePort); //14. 返回用于发出此请求的方案名称，例如：http 、 https 、 ftp String scheme = request.getScheme(); println("Scheme = " + scheme); //15. 返回请求被发送到的服务器的主机名。它是Host头值":"(如果有)之前的那部分的值。 或者解析服务器名称或服务器的IP地址 String serverName = request.getServerName(); println("ServerName = " + serverName); //16. 返回请求被发送到的端口。他是"Host"头值":" （如果有）之后的那部分的值，或者接受客户端连接的服务器端口。 int serverPort = request.getServerPort(); println("ServerPort = " + serverPort); //17. 返回一个boolean值，指示此请求是否是使用安全通道(比如HTTPS) 发出的。 boolean secure = request.isSecure(); println("isSecure = " + secure); //以上方法为 ServletRequest 接口提供的 //以下方法为 HttpServletRequest 接口提供的 /* * 18. 返回用于保护servlet的验证方法名称。 所有的servlet容器都支持 * basic、 form和client certificate验证, 并且可能还支持digest验证 */ String authType = request.getAuthType(); println("authType = " + authType); //19. getDateHeader ?? request.getDateHeader(""); //20. 返回请求头包含的所有头名称的枚举。 Enumeration<String> headerNames = request.getHeaderNames(); println("<hr/>"); while(headerNames.hasMoreElements()){ String name = headerNames.nextElement(); println(" headerNmea = " + name + "; getHeader = " + request.getHeader(name)); } println("<hr/>"); //21. 以int的形式返回指定请求头的值。 ??? request.getIntHeader("123"); //22. 返回与客户端发出此请求时发送的URL相关联的额外路径信息。 String pathInfo = request.getPathInfo(); println("PathInfo = " + pathInfo); //23. 返回包含在请求RUL中路径后面的查询字符串。如果没有查询字符串返回null String remoteUser = request.getRemoteUser(); println("RemoteUser = " + remoteUser); //24. 返回客户端制定的回话ID String requestedSessionId = request.getRequestedSessionId(); println("requestSessionId = " + requestedSessionId); //25. 返回请求调用servlet的URL部分 String servletPath = request.getServletPath(); println("servletPath = " + servletPath); //26. 返回与此请求关联的当前HttpSession，如果没有当前会话并且参数为true,则返回一个新会话。 HttpSession session = request.getSession(true); println("getSession(true) = " + session); //27. 返回包含当前已经过验证的用户的名称的java.security.Principal对象。如果用户没有经过验证，则该方法返回null Principal userPrincipal = request.getUserPrincipal(); println("userPrincipal = " + userPrincipal); //28. 检查会话的id是否作为Cook进入的 boolean sessionIdFromCookie = request.isRequestedSessionIdFromCookie(); println("sessionIdFromCookie = " + sessionIdFromCookie); //29. 检查请求的会话ID是否作为请求的URL的一部分进入的 boolean sessionIdFromURL = request.isRequestedSessionIdFromURL(); println("sessionIdFormURL = " + sessionIdFromURL); //30. println("</ol>"); out.flush(); out.close(); } public void println(Object obj){ this.response.setContentType("text/html;charset=utf-8"); try { out.println("<li>"); out.println(obj); out.println("</li>\n"); } catch (Exception e) { e.printStackTrace(); } }
2. 运行结果
getCharacterEncoding = utf-8getContentLength = -1getContentType = nullgetLocalAddr = 127.0.0.1getLocale = zh_CNLocales = zh_CNLocales = zhLocales = en_USLocales = enlocalName = lm.licenses.adobe.comlocalPort = 8080protocol = HTTP/1.1getReader = org.apache.catalina.connector.CoyoteReader@17b8d3dRemoteAddr = 127.0.0.1RemoteHost = 127.0.0.1RemotePort = 57814Scheme = httpServerName = localhostServerPort = 8080isSecure = falseauthType = null