📄 getheaders.java

📁 jsp动态网站开发技术与实践电子工业出版社随书附赠源代码

💻 JAVA

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package com.chapter5;

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

public class GetHeaders extends HttpServlet 
{ 
	public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException 
	{
		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		out.println("<html>");
		out.println("<head><title>");
		out.println("读取HTTP请求头实例");
		out.println("</title></head>");		
		out.println("<body><div align=center>");
		out.println("<h1>读取HTTP请求头</h1>");
		out.println("<table width=90% border=1>");
		out.println("<tr><th width=20% align=center>请求头名称</th>");
		out.println("<th width=80% align=center>请求头对应值</th></tr>");
		//获取所有的请求头名字
		Enumeration eHeaderNames = request.getHeaderNames();
		//循环显示所有请求头名字和对应值
		while(eHeaderNames.hasMoreElements()) 
		{
			String sHeaderName = (String)eHeaderNames.nextElement();
			out.println("<tr><td>" + sHeaderName + "</td>");
			out.println("<td>" + request.getHeader(sHeaderName) + "</td></tr>");
		}
		out.println("</table></div></body></html>");
	}
	
	public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
	{
		doPost(request,response);
	} 

}

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