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"pageEnco
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：