servlet类中定义的成员变量，被所有的客户线程共享。
要求利用servlet共享变量实现计数器功能。
Count.java
package com.servlet;
import java.io.I.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Count extends HttpServlet {
int count;
public void init() throws ServletException {
count=0;
}
public synchronized void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet|www.125jz.com</TITLE></HEAD>");
out.println(" <BODY>");
count++;
out.print("你是第"+count+"个访问用户！");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
web.xml文件部署servlet:
<servlet> <servlet-name>Count</servlet-name> <servlet-class>com.servlet.Count</servlet-class> </servlet> <servlet-mapping> <servlet-name>Count</servlet-name> <url-pattern>/servlet/Count</url-pattern> </servlet-mapping>
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