visitornum.java

servlet学习代码

package jsp.servlet.chapter7.cookie;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import jsp.servlet.util.ServletUtil;

@SuppressWarnings("serial")
public class VisitorNum extends HttpServlet {
	public void doGet(HttpServletRequest request, 
			HttpServletResponse response) throws IOException{
		
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		Cookie c = ServletUtil.getCookie(request, "RepeatVisitor", "0");
		
		String title="";

		String value = c.getValue();
		int intValue = Integer.parseInt(value);
		c.setValue((new Integer(intValue + 1)).toString());
		response.addCookie(c);
		title = "Visitor Num: " + (intValue + 1);

		out.println("<h1>" + title + "</h1>");
 
	}
}