servlet里经常会用到一些GET方法

转自:http://hi.baidu.com/atomicface/blog/item/de62ac10c099c8cea6ef3f5b.html
servlet里经常会用到一些GET方法，容易弄混，把它们记在这儿了。

servletContext.getContextPath()=
servletContext.getRealPath("/")=F:\ess-branch\web\
servletContext.getRealPath("")=F:\ess-branch\web
servletContext.getContextPath()=
servletContext.getServerInfo()=Apache Tomcat/6.0.18
servletContext.getResource("/")=jndi:/localhost/
httpServletRequest.getContextPath()=
httpServletRequest.getLocalAddr()=127.0.0.1
httpServletRequest.getLocalName()=localhost
httpServletRequest.getLocalPort()=8090
httpServletRequest.getPathInfo()=null
httpServletRequest.getPathTranslated()=null
httpServletRequest.getProtocol()=HTTP/1.1
httpServletRequest.getQueryString()=null
httpServletRequest.getRealPath("")已过时=F:\ess-branch\web
httpServletRequest.getRemoteAddr()=127.0.0.1
httpServletRequest.getRemoteHost()=127.0.0.1
httpServletRequest.getRemotePort()=3288
httpServletRequest.getRemoteUser()=null
httpServletRequest.getRequestURI()=/support/indexinfo/uploadPicture.htm
httpServletRequest.getRequestURL()=http://localhost:8090/support/indexinfo/uploadPicture.htm
httpServletRequest.getScheme()=http
httpServletRequest.getServerName()=localhost
httpServletRequest.getServerPort()=8090
httpServletRequest.getServletPath()=/support/indexinfo/uploadPicture.htm
httpServletRequest.getUserPrincipal()=null

        ServletContext servletContext = ActionContext.getServletContext();
        HttpServletRequest httpServletRequest = ActionContext.getRequest();
        if (servletContext == null) {
            System.out.println("servletContext is null");
        }
        if (httpServletRequest == null) {
            System.out.println("httpServletRequest is null");
        }
        System.out.println("servletContext.getContextPath()="
                + servletContext.getContextPath());

        System.out.println("servletContext.getRealPath(\"/\")="
                + servletContext.getRealPath("/"));
        System.out.println("servletContext.getRealPath(\"\")="
                + servletContext.getRealPath(""));
        System.out.println("servletContext.getContextPath()="
                + servletContext.getContextPath());
        System.out.println("servletContext.getServerInfo()="
                + servletContext.getServerInfo());

        try {
            System.out.println("servletContext.getResource(\"/\")="
                    + servletContext.getResource("/"));
        }
        catch (MalformedURLException e) {
            e.printStackTrace();
        }
        // httpServletRequest
        System.out.println("httpServletRequest.getContextPath()="
                + httpServletRequest.getContextPath());
        System.out.println("httpServletRequest.getLocalAddr()="
                + httpServletRequest.getLocalAddr());
        System.out.println("httpServletRequest.getLocalName()="
                + httpServletRequest.getLocalName());
        System.out.println("httpServletRequest.getLocalPort()="
                + httpServletRequest.getLocalPort());
        System.out.println("httpServletRequest.getPathInfo()="
                + httpServletRequest.getPathInfo());
        System.out.println("httpServletRequest.getPathTranslated()="
                + httpServletRequest.getPathTranslated());
        System.out.println("httpServletRequest.getProtocol()="
                + httpServletRequest.getProtocol());
        System.out.println("httpServletRequest.getQueryString()="
                + httpServletRequest.getQueryString());
        System.out.println("httpServletRequest.getRealPath(\"\")已过时="
                + httpServletRequest.getRealPath(""));
        System.out.println("httpServletRequest.getRemoteAddr()="
                + httpServletRequest.getRemoteAddr());
        System.out.println("httpServletRequest.getRemoteHost()="
                + httpServletRequest.getRemoteHost());
        System.out.println("httpServletRequest.getRemotePort()="
                + httpServletRequest.getRemotePort());
        System.out.println("httpServletRequest.getRemoteUser()="
                + httpServletRequest.getRemoteUser());
        System.out.println("httpServletRequest.getRequestURI()="
                + httpServletRequest.getRequestURI());
        System.out.println("httpServletRequest.getRequestURL()="
                + httpServletRequest.getRequestURL());
        System.out.println("httpServletRequest.getScheme()="
                + httpServletRequest.getScheme());
        System.out.println("httpServletRequest.getServerName()="
                + httpServletRequest.getServerName());
        System.out.println("httpServletRequest.getServerPort()="
                + httpServletRequest.getServerPort());
        System.out.println("httpServletRequest.getServletPath()="
                + httpServletRequest.getServletPath());
        System.out.println("httpServletRequest.getUserPrincipal()="
                + httpServletRequest.getUserPrincipal());