主要通过Attribute进行传递，主要代码如下：
赋值，并定义跳转的页面：
request.setAttribute("user", user);
request.getRequestDispatcher("view.jsp").forward(request, response);
取值，在JSP页面或者另外一个Servlet中：
UserInfo user=(UserInfo)request.getAttribute("user");
示例：
1、login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="Java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML > <html> <head> <title>登录页面</title> </head> <body> <form action="PassServlet" method="post"> <table> <tr> <td>用户名:</td> <td><input type="text" name="name" /></td> </tr> <tr> <td>密 码:</td> <td><input type="password" name="pwd" /></td> </tr> <tr> <td>性别:</td> <td><input type="radio" name="sex" value="男" />男 <input type="radio" name="name" value="女" />女</td> </tr> <tr> <td>年龄:</td> <td><input type="text" name="age" /></td> </tr> <tr> <td>Email:</td> <td><input type="text" name="email" /></td> </tr> <tr> <td><input type="submit" value="注册" /> <input type="reset" value="重置" /></td> </tr> </table> </form> </body> </html>
2、UserInfo.java
package com.jsoft.testservletbasics; public class UserInfo { private String userName; private String userPwd; private String userSex; private int userAge; private String userEmail; public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getUserPwd() { return userPwd; } public void setUserPwd(String userPwd) { this.userPwd = userPwd; } public String getUserSex() { return userSex; } public void setUserSex(String userSex) { this.userSex = userSex; } public int getUserAge() { return userAge; } public void setUserAge(int userAge) { this.userAge = userAge; } public String getUserEmail() { return userEmail; } public void setUserEmail(String userEmail) { this.userEmail = userEmail; } }
3、PassServlet.java
package com.jsoft.testservletbasics; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class PassServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); String name = request.getParameter("name"); String pwd = request.getParameter("pwd"); String sex = request.getParameter("sex"); String age = request.getParameter("age"); String email = request.getParameter("email"); UserInfo user = new UserInfo(); user.setUserName(name); user.setUserPwd(pwd); user.setUserSex(sex); user.setUserAge(Integer.parseInt(age)); user.setUserEmail(email); request.setAttribute("user", user); request.getRequestDispatcher("view.jsp").forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
5、view.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ page import="com.jsoft.testservletbasics.UserInfo" %> <!DOCTYPE HTML > <html> <head> <title>显示页面</title> </head> <body> <% UserInfo user=(UserInfo)request.getAttribute("user"); %> <table border="1" align="center"> <tr> <td>用户名:</td> <td><%=user.getUserName()%></td> </tr> <tr> <td>密 码:</td> <td><%=user.getUserPwd()%></td> </tr> <tr> <td>性别:</td> <td><%=user.getUserSex()%></td> </tr> <tr> <td>年龄:</td> <td><%=user.getUserAge()%></td> </tr> <tr> <td>Email:</td> <td><%=user.getUserEmail()%></td> </tr> </table> </body> </html>
测试工程：https://github.com/easonjim/5_java_example/tree/master/servletbasics/test19