申请

客户端申请由ServletRequest类型的request对象示意，在HTTP申请场景下，容器提供的申请对象的具体类型为HttpServletRequest

HTTP的申请音讯分为三局部：申请行、申请头、申请注释。

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申请行对应办法

// 获取申请行中的协定名和版本public String getProtocol();// 获取申请形式public String getMethod();// url中的额定门路信息public String getPathInfo();// url中的额定门路信息多对应的资源的真是门路public String getPathTranslated();// 获取申请URL所属的WEB应用程序门路，以/结尾，示意整个web站点的根目录public String getContextPath();// 申请行中的参数public String getQueryString();// 获取申请行中的资源名，主机端口之后，参数之前的局部public String getRequestURI();// 获取Servlet所映射的门路public String getServletPath();

网络连接信息相干办法

// 客户端的ippublic String getRemoteAddr();//客户端的主机public String getRemoteHost();//客户端的端口public int getRemotePort();// 服务器接管以后申请的网络接口的ip对应的主机名public String getLocalName();// 服务器接管以后申请的网络接口的ippublic String getLocalAddr();// 服务器接管以后申请的网络接口的端口public int getLocalPort();// 获取URLpublic StringBuffer getRequestURL();// 以后申请所指向的主机名public String getServerName();// 以后申请所连贯的服务器端口号public int getServerPort();// 协定名public String getScheme();

申请头信息

// 获取申请头public long getDateHeader(String name);public String getHeader(String name); public Enumeration<String> getHeaders(String name); public Enumeration<String> getHeaderNames();public int getIntHeader(String name);// 获取Content-Length头字段信息public int getContentLength();// 返回Content-Type头字段信息public String getContentType();// 返回申请音讯的字符集编码，Content-Type头字段信息public String getCharacterEncoding();public String getAuthType();    public Cookie[] getCookies();public String getRemoteUser();public boolean isUserInRole(String role);public java.security.Principal getUserPrincipal();public String getRequestedSessionId();public HttpSession getSession(boolean create);public HttpSession getSession();public String changeSessionId();public boolean isRequestedSessionIdValid();public boolean isRequestedSessionIdFromCookie();public boolean isRequestedSessionIdFromURL();public boolean isRequestedSessionIdFromUrl();public boolean authenticate(HttpServletResponse response)   throws IOException,ServletException;public void login(String username, String password)   throws ServletException;public void logout() throws ServletException;public Collection<Part> getParts() throws IOException, ServletException;public Part getPart(String name) throws IOException, ServletException;public <T extends HttpUpgradeHandler> T  upgrade(Class<T> handlerClass)  throws IOException, ServletException;

获取申请参数

// 读取url地址后的参数或者POST申请中application/x-www-form-urlencoded编码的实体// 能够对编码内容主动实现参数的合成、提取以及解码public String getParameter(String name);public Enumeration<String> getParameterNames();public String[] getParameterValues(String name);public Map<String, String[]> getParameterMap();// 获取流对象public ServletInputStream getInputStream() throws IOException; public BufferedReader getReader() throws IOException;
https://zhhll.icu/2021/javaweb/根底/2.申请/

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