📄 periodservlet1.java
字号:
package ch4.servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class PeriodServlet1 extends HttpServlet
{
static int counter;
public void init()
{
try
{
BufferedReader in=new BufferedReader(new FileReader("counter.txt"));
String s=in.readLine();
if (s!=null)
{
counter=Integer.parseInt(s);
}
else
counter=0;
}
catch(IOException e){}
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException,ServletException
{
response.setContentType("text/HTML;charset=GB2312");
PrintWriter out=response.getWriter();
counter++;
out.println("<HTML>");
out.println("<head>");
out.println("<title> 保持计数器连续</title></head>");
out.println("<body>");
out.println("该Servlet已经被访问 <b>"+String.valueOf(counter)+" </b>次！"+"\n");
out.println("</body>");
out.println("</HTML>");
}
public void destroy()
{
try
{
PrintWriter out=new PrintWriter(new FileOutputStream("counter.txt"),true);
out.println(counter);
System.out.println(counter);
}
catch(IOException e){}
}
}
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