showrequestheaders.java

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import java.io.*; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.util.*; 

public class ShowRequestHeaders extends HttpServlet { 
	public void doGet(HttpServletRequest request, 
		HttpServletResponse response) 
		throws ServletException, IOException { 
		response.setContentType("text/html"); 
		PrintWriter out = response.getWriter(); 
		String title = "显示所有请求头"; 
		out.println(ServletUtilities.headWithTitle(title) + 
			"＜BODY BGCOLOR=＼"#FDF5E6＼"＞＼n" + 
			"＜H1 ALIGN=CENTER＞" + title + "＜/H1＞＼n" + 
			"＜B＞Request Method: ＜/B＞" + 
			request.getMethod() + "＜BR＞＼n" + 
			"＜B＞Request URI: ＜/B＞" + 
			request.getRequestURI() + "＜BR＞＼n" + 
			"＜B＞Request Protocol: ＜/B＞" + 
			request.getProtocol() + "＜BR＞＜BR＞＼n" + 
			"＜TABLE BORDER=1 ALIGN=CENTER＞＼n" + 
			"＜TR BGCOLOR=＼"#FFAD00＼"＞＼n" + 
			"＜TH＞Header Name＜TH＞Header Value"); 
		Enumeration headerNames = request.getHeaderNames(); 
		while(headerNames.hasMoreElements()) { 
			String headerName = (String)headerNames.nextElement(); 
			out.println("＜TR＞＜TD＞" + headerName); 
			out.println(" ＜TD＞" + request.getHeader(headerName)); 
		} 
		out.println("＜/TABLE＞＼n＜/BODY＞＜/HTML＞"); 
	} 
	
	public void doPost(HttpServletRequest request, 
	HttpServletResponse response) 
	throws ServletException, IOException { 
	doGet(request, response); 
	} 
}