HttpServletRequest 方法详解

request.setCharacterEncoding("utf-8");//设置request编码方式
		request.getLocalAddr();//获取本地IP，即服务器IP
		request.getLocalName();//获取本地名称，即服务器名称
		request.getLocalPort();//获取本地端口号，即Tomcat端口号
		request.getLocale();//用户的语言环境
		request.getContextPath();//context路径
		request.getMethod();//GET还是POST
		request.getProtocol();//协议，http协议
		request.getQueryString();//查询字符串
		request.getRemoteAddr();//远程IP，即客户端IP
		request.getRemotePort();//远程端口，即客户端端口
		request.getRemoteUser();//远程用户
		request.getRequestedSessionId();//客户端的Session的ID
		request.getRequestURI();//用户请求的URL
		request.getScheme();//协议头，例如http
		request.getServerName();//服务器名称
		request.getServerPort();//服务器端口
		request.getServletPath();//Servlet路径

<%@page import="java.security.Principal"%>
<%@page import="java.io.BufferedReader"%>
<%@page import="java.io.IOException"%>
<%@page import="java.io.PrintWriter"%>
<%@page import="com.thinkgem.jeesite.common.mapper.JsonMapper"%>
<%@page import="com.google.common.collect.Maps"%>
<%@page import="org.apache.commons.lang3.StringUtils"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%!
public void getReqInfo(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html; charset = utf-8");
    PrintWriter out = response.getWriter();
    println(out,"<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(out,"getCharacterEncoding = " + characterEncoding);
    
    //2. get body length
    int contentLength = request.getContentLength();
    println(out,"getContentLength = " + contentLength);
    
    //3. MIME type
    String mimeType = request.getContentType();
    println(out,"getContentType = " + mimeType);
    
    //4. 接收请求的接口的 Internet Protocol (IP) 地址
    String ip = request.getLocalAddr();
    println(out,"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(out,"getLocale = " + locale);
    
    //6. 所有的语言环境
    Enumeration<Locale> locales = request.getLocales();
    while(locales.hasMoreElements()){
        Locale temp = locales.nextElement();
        println(out,"\n Locales = " + temp);
    }
    
    //7. 接收请求的 Internet Protocol (IP) 接口的主机名
    String localName = request.getLocalName();
    println(out,"localName = " + localName);
    
    //8. 接收请求的接口的 Internet Protocol (IP) 端口号
    int localPort = request.getLocalPort();
    println(out,"localPort = " + localPort);
    
    //9. 返回请求使用的协议的名称和版本
    String protocol = request.getProtocol();
    println(out,"protocol = " + protocol);
    
    //10. 读取请求正文信息
    BufferedReader reader = request.getReader();
    println(out,"getReader = " + reader.toString());
    
    //11. 发送请求的客户端
    String remoteAddr = request.getRemoteAddr();
    println(out,"RemoteAddr = " + remoteAddr);
    
    //12. 发送请求的客户主机
    String remoteHost = request.getRemoteHost();
    println(out,"RemoteHost = " + remoteHost);
    
    //13. 发送请求的客户主机端口
    int remotePort = request.getRemotePort();
    println(out,"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(out,"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(out,"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(out,"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(out,"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(out,"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(out,"<hr/>");
    while(headerNames.hasMoreElements()){
        String name = headerNames.nextElement();
        println(out," headerNmea = " + name + ";　　　getHeader = " + request.getHeader(name));
    }
    
    println(out,"<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(out,"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(out,"RemoteUser = " + remoteUser);
    
    //24. 返回客户端制定的回话ID
    String requestedSessionId = request.getRequestedSessionId();
    println(out,"requestSessionId = " + requestedSessionId);
    
    //25. 返回请求调用servlet的URL部分
    String servletPath = request.getServletPath();
    println(out,"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(out,"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(out,"userPrincipal = " + userPrincipal);
    
    //28. 检查会话的id是否作为Cook进入的
    boolean sessionIdFromCookie = request.isRequestedSessionIdFromCookie();
    println(out,"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(out,"sessionIdFormURL = " + sessionIdFromURL);
    
    //30. 
    
    println(out,"</ol>");
    out.flush();
    out.close();

}

public void println(PrintWriter out,Object obj){
    try {
        out.println("<li>");
        out.println(obj);
        out.println("</li>\n");
    } catch (Exception e) {
        e.printStackTrace();
    }
}
%>
<%
getReqInfo(request,response);
%>