jsp的URL重写实现会话跟踪技术

最新推荐文章于 2025-06-09 16:53:52 发布

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#jsp的URL重写实现会话跟踪技术

本文介绍了一个简单的示例，展示了如何通过使用Java Servlets和JSP页面来创建和使用HTTP会话(Session)。具体包括创建一个允许用户输入名字的表单，并将此名字存储在会话中，然后从另一个Servlet检索该名字并显示。

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1.新建一个Dynamic Web Project项目，里面新建两个java文件和一个jsp文件，整体的框架如下所示：

2.useSession.jsp里面的代码如下所示：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
	<form action="<%=response.encodeURL("sendMyName")%>" method="post">
		<table>
			<tr>
				<td>用户名：</td>
				<td><input type="text" name="user" /></td>
			</tr>
			<tr>
				<td><input type="submit" value="提交" /></td>
			</tr>
		</table>
	</form>
</body>
</html>

3.UseSessionSevlet.java文件里面的代码如下所示:

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet(name = "useSession", urlPatterns = { "/sendMyName" })
public class UseSessionSevlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
	}

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		request.setCharacterEncoding("utf-8");
		String name = request.getParameter("user");
		if (name == null || name.trim().length() == 0) {
			response.sendRedirect(response.encodeRedirectURL("useSession.jsp"));
		} else {
			HttpSession session = request.getSession(true);
			session.setAttribute("myName", name);
			out.println("<html><body>");
			out.println("您请求的sevlet对象是：" + getServletName());
			out.println("<br>您的会话ID是：" + session.getId());
			out.println("<br>单击请求另一个sevlet：");
			out.println("<br><a href=" + response.encodeURL("showMyName")
					+ ">请求另一个sevlet</a>");
			out.println("</html></body>");
		}
	}

}

4.ShowNameSevlet.java文件里面的代码如下所示：

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet(name = "showName", urlPatterns = { "/showMyName" })
public class ShowNameSevlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
	}

	@Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	@Override
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		HttpSession session = request.getSession(true);
		String name = (String) session.getAttribute("myName");
		out.println("<html><body>");
		out.println("您请求的sevlet对象是：" + getServletName());
		out.println("<br>您的会话ID是：" + session.getId());
		out.println("<br>您会话中存储的用户名是：" + name);
		out.println("</html></body>");
	}

}

5.在浏览器里面输入http://localhost:8080/Servlet/useSession.jsp运行得到的结果如下所示：