📄 servletsession.java
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import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class ServletSession extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException {
resp.setContentType("text/html;charset=GB2312");
PrintWriter out=new PrintWriter(resp.getOutputStream());
String[] bookes=null;
HttpSession ses=req.getSession(true);
if(ses!=null)
bookes=(String[])ses.getValue("Bookes");
out.println("<HTML>");
out.println("<HEAD><TITLE>Servlet Session</TITLE></HEAD>");
out.println("<BODY>");
out.println("<CENTER><H2>您购买了下列图书：</H2>");
for(int i=0;i<bookes.length;i++)
out.println(bookes[i]+"<BR>");
out.println("</CENTER></BODY></HTML>");
out.close();
}
public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException {
resp.setContentType("text/html;charset=GB2312");
PrintWriter out=new PrintWriter(resp.getOutputStream());
String bookes[]=req.getParameterValues("Bookes");
HttpSession ses=req.getSession(true);
if(ses!=null)
ses.putValue("Bookes",bookes);
out.println("<HTML>");
out.println("<HEAD><TITLE>Servlet Session</TITLE></HEAD>");
out.println("<BODY>");
out.println("<CENTER><H2>您选择了下列图书：</H2>");
for(int i=0;i<bookes.length;i++)
out.println(bookes[i]+"<BR>");
out.println("<FORM ACTION=/servlets/ServletSession "+"METHOD=GET>");
out.println("<INPUT TYPE=\"Submit\" NAME=\"add\" VALUE="+"\"确认购买\"></FORM>");
out.println("</CENTER></BODY></HTML>");
out.close();
}
}
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