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用户在初始化页面中输入一个值，点击提交按钮，会进入第一个Servelet,第一个Servelet将输入的值分别保存到request和Session中；在第二个Serveletd从request和Session对象中提取信息并显示
session.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Session实例</title>
</head>
<body>
<center>
<form method="post"action="FirstServlet1">
<table>
<tr>
<td>输入数据：<input type="text"name="count" ></td>
</tr>
</table>
<center><input type="submit" value="提交"></center>
</form>
</center>
</body>
</html>
FirstServelet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class FirstServlet1 extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("GBK");
response.setContentType("text/html;charset=GBK");
PrintWriter out = response.getWriter();
String str = request.getParameter("count");
request.setAttribute("request_param",str);
HttpSession session = request.getSession();
session.setAttribute("session_param",str);
out.println("<a href='SecondServlet2'>下一页</a>");
}
}
SecondServelet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class SecondServlet2 extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response); }
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Object obj =request.getAttribute("request_param");
String request_param = null;
if (obj!=null){
request_param = obj.toString();
}
else{
request_param="null";
}
HttpSession session = request.getSession();
Object obj2 = session.getAttribute("session_param");
String session_param=null;
if(obj2!=null){
session_param = obj2.toString();
}
else{
session_param="null";
}
response.setContentType("text/html;charset=GBK");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<h2>请求对象中的参数是："+request_param+"<h2>");
out.println("<h2>session中的参数是："+session_param+"<h2></body><html>");
}
}