《JavaWeb编程技术》课后习题答案(4)

时间:2025-07-11

response.setContentType("text/html;charset=gb2312");

PrintWriter out = response.getWriter();

visits = visits +1;

try{

Thread.sleep(2000);

}catch(InterruptedException e){

log("Exception during sleeping.");

}

out.println("<html><body>");

out.println("欢迎您!<br>" + "该Servlet已被访问 " + visits +" 次。"); out.println("</body></html>");

}

}

修改后的Servlet如下:

package com.demo;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

public class HelloCounterServlet extends HttpServlet{

private Integer visits = 0;

private String dbPath = null;

public void init(){

try{

dbPath = getServletContext().getRealPath("/WEB-INF/counter.db");

FileInputStream fis = new FileInputStream(dbPath);

DataInputStream dis = new DataInputStream(fis);

visits = dis.readInt();

dis.close();

}catch(Exception e){

log("Error loading persistent counter", e);

}

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException {

response.setContentType("text/html;charset=gb2312");

PrintWriter out = response.getWriter();

synchronized(this){

visits = visits +1;

out.println("<html><body>");

out.println("欢迎您!<br>" +"该Servlet已被访问 " + visits +" 次。"); out.println("</body></html>");

}

}

public void destroy(){

try{

FileOutputStream fos = new FileOutputStream(dbPath);

DataOutputStream dos = new DataOutputStream(fos);

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