如何查看Servlet，JSP的版本
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了如何查看Servlet，JSP的版本相关的知识，希望对你有一定的参考价值。
简要说明：Tomcat6.0 所支持的是Servlet2.5，Tomcat 7.0 所支持的Servlet3.0，Servlet2.5 和Servlet3.0的差异较大，对于Servlet3.0而言，WEB-INF路径下的web.xml文件不再是必需的，但通常还是建议保留；当 然，Servlet2.5 和 Servlet3.0 还是有很多其他方面的差别2. 查看Servlet和jsp的版本
进入Tomcat根目录下的lib，找到servlet-api.jar/jsp-api.jar
双击使用WinRAR打开，找到META-INF\MANIFEST.MF文件，其中便包含了其版本信息；
我的Servlet版本信息
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.4
Created-By: 1.6.0_39-b04 (Sun Microsystems Inc.)
X-Compile-Source-JDK: 1.6
X-Compile-Target-JDK: 1.6
Name: javax/servlet/
Specification-Title: Java API for Servlets
Specification-Version: 3.0 //servlet版本
Specification-Vendor: Sun Microsystems, Inc.
Implementation-Title: javax.servlet
Implementation-Version: 3.0.FR
Implementation-Vendor: Apache Software Foundation
我的Jsp版本信息
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.4
Created-By: 1.6.0_39-b04 (Sun Microsystems Inc.)
X-Compile-Source-JDK: 1.6
X-Compile-Target-JDK: 1.6
Name: javax/servlet/jsp/
Specification-Title: Java API for JavaServer Pages
Specification-Version: 2.2 //jsp版本
Specification-Vendor: Sun Microsystems, Inc.
Implementation-Title: javax.servlet.jsp
Implementation-Version: 2.2.FR
Implementation-Vendor: Apache Software Foundation 参考技术A 找到jsp-api.jar和servlet-api.jar两个jar包，分别用winrar这类的软件打开，里面的META-INF文件夹下的MANIFEST.MF文件，里面有相应的版本号
jsp是2.1，servlet是2.5
IDEA+Java+Servlet+JSP+Mysql实现学生选课签到系统
一、系统介绍
1.开发环境
开发工具：IDEA2018
JDK版本：jdk1.8
Mysql版本：8.0.13
2.技术选型
Java+Servlet+Boostrap+Jsp+Mysql
3.系统功能
1.用户注册登录系统；
2.管理员审核用户，查看课程选课情况，开启签到，删除课程，修改密码；
3.教师创建课程，查看成员，开启签到，删除课程，修改密码；
4.学生选择课程，退选课程，修改密码；
4.数据库文件
/*
Navicat Premium Data Transfer
Source Server : MYSQL
Source Server Type : MySQL
Source Server Version : 80013
Source Host : localhost:3306
Source Schema : servlet_select_course
Target Server Type : MySQL
Target Server Version : 80013
File Encoding : 65001
Date: 24/12/2021 16:58:38
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for tb_courses
-- ----------------------------
DROP TABLE IF EXISTS `tb_courses`;
CREATE TABLE `tb_courses` (
`course_id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`teach_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`day` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`is_signin` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`member_num` int(11) NULL DEFAULT NULL,
PRIMARY KEY (`course_id`) USING BTREE,
INDEX `C_FK`(`teach_id`) USING BTREE,
CONSTRAINT `C_FK` FOREIGN KEY (`teach_id`) REFERENCES `tb_users` (`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE = InnoDB AUTO_INCREMENT = 29 CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_courses
-- ----------------------------
INSERT INTO `tb_courses` VALUES (27, '软件工程', '101', '星期一, 1 - 2 节', 'false', 1);
INSERT INTO `tb_courses` VALUES (28, '计算机导论', '104', '星期二, 3 - 4 节', 'false', 0);
-- ----------------------------
-- Table structure for tb_join
-- ----------------------------
DROP TABLE IF EXISTS `tb_join`;
CREATE TABLE `tb_join` (
`course_id` int(11) NULL DEFAULT NULL,
`stu_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`checked` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_join
-- ----------------------------
INSERT INTO `tb_join` VALUES (27, '1001', 'true');
INSERT INTO `tb_join` VALUES (28, '1001', 'checking');
-- ----------------------------
-- Table structure for tb_signin
-- ----------------------------
DROP TABLE IF EXISTS `tb_signin`;
CREATE TABLE `tb_signin` (
`signin_id` int(11) NOT NULL AUTO_INCREMENT,
`course_id` int(11) NULL DEFAULT NULL,
`time` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`signin_num` int(11) NULL DEFAULT NULL,
`end_time` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
PRIMARY KEY (`signin_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 25 CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_signin
-- ----------------------------
INSERT INTO `tb_signin` VALUES (24, 27, '2021-12-20 15:15:48', 1, '2021-12-20 15:16:16');
-- ----------------------------
-- Table structure for tb_signin_stu
-- ----------------------------
DROP TABLE IF EXISTS `tb_signin_stu`;
CREATE TABLE `tb_signin_stu` (
`signin_id` int(11) NULL DEFAULT NULL,
`stu_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`state` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_signin_stu
-- ----------------------------
INSERT INTO `tb_signin_stu` VALUES (24, '1001', 'true');
-- ----------------------------
-- Table structure for tb_users
-- ----------------------------
DROP TABLE IF EXISTS `tb_users`;
CREATE TABLE `tb_users` (
`user_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
`password` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`name` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`type` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`checked` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
PRIMARY KEY (`user_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_users
-- ----------------------------
INSERT INTO `tb_users` VALUES ('1001', '123456', '同学1', 'stu', 'true');
INSERT INTO `tb_users` VALUES ('1002', '123456', '同学2', 'stu', 'true');
INSERT INTO `tb_users` VALUES ('101', '123456', '教师1', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('102', '123456', '教师2', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('103', '123456', '教师3', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('104', '123456', '王老师', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('105', '123456', '李老师', 'teach', 'false');
INSERT INTO `tb_users` VALUES ('admin', 'admin', '管理员', 'admin', 'true');
SET FOREIGN_KEY_CHECKS = 1;
二、系统展示
1.登录系统
2.注册系统
3.管理员-首页
4.管理员-管理用户
5.管理员-管理课程
6.管理员-修改密码
7.教师-创建课程
8.教师-我的课程
9.教师-修改密码
10.学生-加入课程
11.学生-我的课程
12.学生-修改密码
三、部分代码
CreateCourseAction
package com.sjsq.servlet;
import com.sjsq.bean.Course;
import com.sjsq.bean.User;
import com.sjsq.dao.CourseDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/CreateCourseAction")
@MultipartConfig
public class CreateCourseAction extends HttpServlet
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
super.doGet(req, resp);
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String courseName = req.getParameter("courseName");
String day = req.getParameter("day");
String courseTime = req.getParameter("courseTime");
String Day = day + ", " + courseTime;
User user = (User) req.getSession().getAttribute("User");
String teach_id = user.getId();
Course course = new Course(0, courseName, teach_id, Day, "false", 0);
CourseDao courseDao = new CourseDao();
int result = courseDao.Create(course);
if (result == 0)
out.println("<script> alert('创建课程失败'); location='teacher_create.jsp'; </script>");
else if (result == 1)
out.println("<script> alert('创建课程成功'); location='teacher_create.jsp'; </script>");
else
out.println("<script> alert('上课时间冲突'); location='teacher_create.jsp'; </script>");
DeleteAction
package com.sjsq.servlet;
import com.sjsq.dao.CourseDao;
import com.sjsq.dao.JoinDao;
import com.sjsq.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
@WebServlet("/DeleteAction")
@MultipartConfig
public class DeleteAction extends HttpServlet
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String ope = req.getParameter("ope");
if (ope.equals("userdel"))
// 删除用户
String user_id = req.getParameter("user_id");
UserDao userDao = new UserDao();
if (userDao.DelUser(user_id) == 1)
out.println("<script> alert('删除成功'); location='toaudit.jsp'; </script>");
else
out.println("<script> alert('删除失败'); location='toaudit.jsp'; </script>");
else if (ope.equals("useradd"))
// 用户审核
String user_id = req.getParameter("user_id");
UserDao userDao = new UserDao();
try
if (userDao.Check(user_id) == 1)
out.println("<script> alert('审核通过'); location='toaudit.jsp'; </script>");
else
out.println("<script> alert('操作失败'); location='toaudit.jsp'; </script>");
catch (SQLException e)
// TODO Auto-generated catch block
e.printStackTrace();
out.println("<script> alert('操作失败'); location='toaudit.jsp'; </script>");
else if (ope.equals("coursedel"))
// 课程删除
String c = req.getParameter("course_id");
String type = req.getParameter("type");
int course_id = Integer.valueOf(c);
CourseDao courseDao = new CourseDao();
if (courseDao.DelCourse(course_id) == 1)
if (type.equals("admin"))
out.println("<script> alert('课程删除成功'); location='show_all_courses.jsp'; </script>");
else
out.println("<script> alert('课程删除成功'); location='my_courses.jsp'; </script>");
else
if (type.equals("admin"))
out.println("<script> alert('课程删除失败'); location='show_all_courses.jsp'; </script>");
else
out.println("<script> alert('课程删除失败'); location='my_courses.jsp'; </script>");
else if (ope.equals("joindel"))
// 退出选课
String c = req.getParameter("course_id");
String user_id = req.getParameter("user_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
JoinDao joinDao = new JoinDao();
if (joinDao.Delete(course_id, user_id) == 1)
out.println("<script> alert('退出成功'); location='" + from_ + "'; </script>");
else
out.println("<script> alert('退出失败'); location='" + from_ + "'; </script>");
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
super.doPost(req, resp);
LoginAction
package com.sjsq.servlet;
import com.sjsq.bean.User;
import com.sjsq.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
@WebServlet("/LoginAction")
@MultipartConfig
public class LoginAction extends HttpServlet
private static final long serialVersionUID = 1L;
public LoginAction()
super();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
resp.sendRedirect("login.jsp");
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String user_id = req.getParameter("inputUser_id"); // 从name属性中获取
String userPass = req.getParameter("inputPassword");
User user = new User();
user.setId(user_id);
user.setPassword(userPass);
UserDao userDao = new UserDao();
User user2;
try
user2 = userDao.Query(user);
catch (SQLException e)
// TODO Auto-generated catch block
e.printStackTrace();
out.println("<script> alert('登陆失败'); location='login.jsp'; </script>");
return;
if ((user2.getId()).equals(""))
// 用户不存在
out.println("<script> alert('用户不存在'); location='login.jsp'; </script>");
else if (user2.getPassword().equals(userPass))
// 登陆成功
req.getSession(true).setAttribute("User", user2);
out.println("<script> alert('登陆成功'); location='index.jsp'; </script>");
else
// 密码错误
out.println("<script> alert('密码错误'); location='login.jsp'; </script>");
LogoutAction
package com.sjsq.servlet;
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;
import java.io.IOException;
@WebServlet("/LogoutAction")
public class LogoutAction extends HttpServlet
private static final long serialVersionUID = 1L;
public LogoutAction()
super();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
HttpSession session = req.getSession(false);
if (session == null)
resp.sendRedirect("login.jsp");
return;
session.removeAttribute("User");
resp.sendRedirect("login.jsp");
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
doGet(req, resp);
MulAction
package com.sjsq.servlet;
import com.sjsq.bean.Join;
import com.sjsq.dao.CourseDao;
import com.sjsq.dao.JoinDao;
import com.sjsq.dao.SigninDao;
import com.sjsq.dao.SigninStuDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/MulAction")
@MultipartConfig
public class MulAction extends HttpServlet
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String ope = req.getParameter("ope");
if (ope.equals("joincreat"))
String c = req.getParameter("course_id");
String user_id = req.getParameter("user_id");
int course_id = Integer.valueOf(c);
Join join = new Join(course_id, user_id, "checking");
JoinDao joinDao = new JoinDao();
int result = joinDao.Creat(join);
if (result == 2)
out.println("<script> alert('课程已经选过'); location='show_all_courses.jsp'; </script>");
else if (result == 1)
out.println("<script> alert('加入成功'); location='show_all_courses.jsp'; </script>");
else
out.println("<script> alert('加入失败'); location='show_all_courses.jsp'; </script>");
else if (ope.equals("joinaccept"))
String c = req.getParameter("course_id");
String user_id = req.getParameter("user_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
JoinDao joinDao = new JoinDao();
int result = joinDao.Update(course_id, user_id, "true");
if (result == 1)
out.println("<script> alert('通过成功'); location='" + from_ + "'; </script>");
else
out.println("<script> alert('通过失败'); location='" + from_ + "'; </script>");
else if (ope.equals("signincreat"))
String c = req.getParameter("course_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
SigninDao signinDao = new SigninDao();
int result = signinDao.Creat(course_id);
if (result == 1)
SigninStuDao signinStuDao = new SigninStuDao();
CourseDao courseDao = new CourseDao();
int signin_id = signinDao.FindLast(course_id);
signinStuDao.Creat(signin_id, course_id);
courseDao.Update(course_id, "true");
out.println("<script> alert('签到已开始'); location='" + from_ + "'; </script>");
else
out.println("<script> alert('开始失败'); location='" + from_ + "'; </script>");
else if (ope.equals("signinstop"))
String c = req.getParameter("course_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
CourseDao courseDao = new CourseDao();
int result = courseDao.Update(course_id, "false");
if (result == 1)
SigninDao signinDao = new SigninDao();
signinDao.Update(signinDao.FindLast(course_id));
out.println("<script> alert('签到已停止'); location='" + from_ + "'; </script>");
else
out.println("<script> alert('停止失败'); location='" + from_ + "'; </script>");
else if (ope.equals("signin"))
String stu_id = req.getParameter("stu_id");
String c = req.getParameter("signin_id");
int signin_id = Integer.valueOf(c);
String from_ = java.net.URLDecoder.decode(req.getParameter("from_"), "UTF-8");
SigninStuDao signinStuDao = new SigninStuDao();
int result = signinStuDao.Update(signin_id, stu_id, "true");
if (result == 1)
SigninDao signinDao = new SigninDao();
signinDao.AddNum(signin_id);
out.println("<script> alert('签到成功'); location='" + from_ + "'; </script>");
else
out.println("<script> alert('签到失败'); location='" + from_ + "'; </script>");
RegisterAction
package com.sjsq.servlet;
import com.sjsq.bean.User;
import com.sjsq.dao.UserDao;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/RegisterAction")
@MultipartConfig
public class RegisterAction extends HttpServlet
/**
*
*/
private static final long serialVersionUID = 1L;
public RegisterAction()
super();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
req.setCharacterEncoding("utf-8");
RequestDispatcher rd = req.getRequestDispatcher("register.jsp");
rd.forward(req, resp);
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String user_id = req.getParameter("inputUser_id");
String userPass = req.getParameter("inputPassword");
String Confirm = req.getParameter("confirmPassword");
String name = req.getParameter("inputName");
String type = req.getParameter("type");
int flag = 0;
for (int i = 0; i < user_id.length(); i++) if (user_id.charAt(i) < '0' || user_id.charAt(i) > '9') flag++;
if (flag != 0)
out.println("<script> alert('学号只能含有数字'); location='register.jsp'; </script>");
else if (!userPass.equals(Confirm))
out.println("<script> alert('两次密码不相同'); location='register.jsp'; </script>");
else
User user = new User(user_id, userPass, name, type);
UserDao userDao = new UserDao();
int result = userDao.create(user);
if (result == 1)
out.println("<script> alert('注册成功'); location='login.jsp'; </script>");
else
if (result == 0) out.println("<script> alert('注册失败'); location='register.jsp'; </script>");
else out.println("<script> alert('该账号已被注册'); location='register.jsp'; </script>");
UpdateUserAction
package com.sjsq.servlet;
import com.sjsq.bean.User;
import com.sjsq.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
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;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
@WebServlet("/UpdateUserAction")
@MultipartConfig
public class UpdateUserAction extends HttpServlet
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
super.doGet(req, resp);
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String oldPass = req.getParameter("oldPassword");
String newPass = req.getParameter("newPassword");
String Confirm = req.getParameter("confirmPassword");
if (!newPass.equals(Confirm))
out.println("<script> alert('两次密码不相同'); location='update_user.jsp'; </script>");
else
User user = (User) req.getSession().getAttribute("User");
if (!user.getPassword().equals(oldPass))
out.println("<script> alert('原密码错误'); location='update_user.jsp'; </script>");
else
UserDao userDao = new UserDao();
int result = 0;
try
result = userDao.Update(user.getId(), newPass);
catch (SQLException e)
// TODO Auto-generated catch block
e.printStackTrace();
if (result == 1)
HttpSession session = req.getSession(false);
session.removeAttribute("User");
out.println("<script> alert('修改密码成功'); location='login.jsp'; </script>");
resp.sendRedirect("login.jsp");
else
out.println("<script> alert('修改密码失败'); location='update_user.jsp'; </script>");
resp.sendRedirect("update_user.jsp");
四、其他
1.更多系统
Java+JSP系统系列实现
Java+Servlet系统系列实现
Java+SSM系统系列实现
Java+SSH系统系列实现
Java+Springboot系统系列实现
Java+Springboot+H-ui+Maven实现营销管理系统
Java+Springboot+Bootstrap+Maven实现网上商城系统
Java+Springboot+Bootstrap+Maven实现景区旅游管理系统
1.更多JavaWeb系统请关注专栏。
https://blog.csdn.net/helongqiang/category_10020130.html2.更多JavaSwing系统请关注专栏。
https://blog.csdn.net/helongqiang/category_6229101.html2.源码下载
sql在sql文件夹下面
Java+Servlet+JSP+Mysql实现Web学生选课签到系统
3.备注
如有侵权请联系我删除。
4.支持博主
如果您觉得此文对您有帮助，请点赞加关注加收藏。祝您生活愉快！想要获取其他资源可关注左侧微信公众号获取！
以上是关于如何查看Servlet，JSP的版本的主要内容，如果未能解决你的问题，请参考以下文章
用eclipse同步项目后,如何查看jsp编译后的servlet源码?
流行的 JSP/Servlet/Portlet 错误日志查看器？ [复制]
Eclipse javaEE 版如何查看源代码？ 我的代码中有个request对象，ctrl+左键点击进入窗口,有一个提示