Servlet面试题

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1、1、Servlet如何得到服务器的信息？Servlet可以使用如下四种方法来得到server的name,port和infopublicStringServletRequest.getServerName()publicStringServletRequest.getServerPort()publicStringServletContext.getServerInfo()publicStringServletRequest.getAttributes(Stringname)如下代码实现用servlet取得server的信息并输出到客户端浏览器：

2、importjava.io.*;importjava.util.*;importjavax.servlet.*;importjavax.servlet.http.*;publicclassDemoServerSnoopextendsGenericServlet{publicvoidservice(ServletRequestreq,ServletResponseres)throwsServletException,IOException{res.setContentType("text/plain");PrintWriterout=res.ge

3、tWriter();out.println("req.getServerName()"+req.getServerName());out.println("req.getServerPort()"+req.getServerPort());out.println("ServletContext().getServerInfo()"+getServletContext().getServerInfo());out.println("getServerInfo()name:"+getServerInfoName(getServletContext(

4、).getServerInfo()));out.println("getServerInfo()version:"+getServerInfoVersion(getServletContext().getServerInfo()));out.println("getServerContext().getAttribute("attribute")"+getServletContext().getAttribute("attribute"));}privateStringgetServerInfoName(StringserverInfo){

5、intslash=serverInfo.indexOf('/');if(slash==-1)returnserverInfo;elsereturn(String)serverInfo.subSequence(0,slash);}privateStringgetServerInfoVersion(StringserverInfo){intslash=serverInfo.indexOf('/');if(slash==-1)returnnull;elsereturnserverInfo.substring(slash+1);}}2、Servlet如

6、何得到客户端机器的信息？Servlet可以使用getRemoteAddr()和getRemoteHost()来得到客户端的IP地址和host,代码如下所示：publicStringServletRequest.getRemoteAddr()publicStirngServletRequest.getRemoteHost()用这些方法来访问客户端有所限制，如下代码实现了对客户端配置进行检查并把相关消息发送到客户端的功能：importjava.io.*;importjava.util.*;importjavax.servlet.*;importja

7、vax.servlet.http.*;publicclassDemoExportRestrictionextendsHttpServlet{publicvoiddoGet(HttpServletRequestreq,HttpServletResponseres)throwsServletException,IOException{res.setContentType("text/plain");PrintWriterout=res.getWriter();//得到客户端的hostnameStringremoteHost=req.getRemot

8、eHost();//查看客户端是否允许这样的操作if(!isHostAllowed(remoteHost)){out.println("Access<