JavaWeb信息管理系统
java servlet学习(一)
Servlet学习（二）Request和Response
Servlet学习(三)Servlet请求与cookie
Servlet学习（三）图解Session
Servlet学习（四）ServletContext 和ServletConfig
JSP学习总结
Servlet和jsp学习后利用项目复习实践知识。
设计数据库
用户id、用户名、用户密码、用户性别、用户年龄、用户出生日期。
设计一张用户表，其表结构如下：
CREATE TABLE `t_user` (
`uid` int(10) NOT NULL AUTO_INCREMENT,
`uname` varchar(50) NOT NULL,
`pwd` varchar(50) NOT NULL,
`sex` char(2) NOT NULL,
`age` int(3) DEFAULT NULL,
`birth` date DEFAULT NULL,
PRIMARY KEY (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
实现功能
- 用户登录
- 用户退出
- 用户信息查询
- 所有用户信息查询
- 修改该登录用户密码
- 新用户注册
- 利用log4j记录日志
开发环境
- jdk11
- Tomcat 9
- eclipse
- MySQL8
部分代码
Servlet部分
package hu.web.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import hu.web.pojo.User;
import hu.web.service.impl.UserServiceImpl;
/**
* Servlet implementation class UserServlet
*/
public class UserServlet extends HttpServlet {
Logger logger=Logger.getLogger(UserServlet.class);
UserServiceImpl usi=new UserServiceImpl();
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//设置请求和响应编码
req.setCharacterEncoding("utf8");
resp.setContentType("text/html;charset=utf8");
//获得隐藏标签内容，查看是否是登录表单
String oper=req.getParameter("oper");
if(oper==null) {
logger.debug("操作符获取失败");
}
if("login".equals(oper)) {
//用户登录验证
checkUserLogin(req, resp);
}else if("out".equals(oper)) {
//用户退出
userOut(req,resp);
}else if("pwd".equals(oper)) {
//更新密码
updatePwd(req,resp);
}else if("reg".equals(oper)) {
//用户注册
userReg(req,resp);
}else if("show".equals(oper)) {
//所有用户信息查询
userShow(req,resp);
}else {
logger.debug("操作符错误");
}
}
/**
* 注册用户
* @param req
* @param resp
*/
private void userReg(HttpServletRequest req, HttpServletResponse resp) {
//获得请求数据并进行相关处理
String name=req.getParameter("uname");
String pwd=req.getParameter("pwd");
String sex=req.getParameter("sex");
String ageStr=req.getParameter("age");
int age=0;
if("".equals(ageStr)) {
age=0;
}else {
age=Integer.parseInt(ageStr);
}
String birth=req.getParameter("birth");
String[] arr=birth.split("/");
birth=arr[2]+"-"+arr[0]+"-"+arr[1];
User user=new User(0, name, pwd, sex, age, birth);
int num = usi.userRegService(user);
if(num>0) {
HttpSession hs=req.getSession();
hs.setAttribute("flag", 2);
try {
resp.sendRedirect("/infomanager/login.jsp");
} catch (IOException e) {
logger.debug("注册重定向失败");
}
}
}
/**
* 显示所有用户信息
*/
private void userShow(HttpServletRequest req, HttpServletResponse resp) {
List<User> list=usi.userShowService();
if(list!=null) {
req.setAttribute("userList", list);
try {
req.getRequestDispatcher("/user/usershow.jsp").forward(req, resp);
return;
} catch (ServletException e) {
logger.debug("获取所有用户信息转发失败");
} catch (IOException e) {
logger.debug("获取所有用户信息转发失败");
}
}
}
/**
* 修改密码
* @param req
* @param resp
*/
private void updatePwd(HttpServletRequest req, HttpServletResponse resp) {
//得到新密码
String newPwd=req.getParameter("newPwd");
//得到用户id
HttpSession hs=req.getSession();
User user=(User)hs.getAttribute("user");
int id=user.getUid();
//修改密码
int num = usi.updatePwdService(id, newPwd);
//设置session
user.setPwd(newPwd);
hs.setAttribute("user", user);
if(num>0) {
hs.setAttribute("flag", 1);
try {
resp.sendRedirect("/infomanager/login.jsp");
} catch (IOException e) {
logger.debug("修改密码重定向失败");
}
}
}
/**
* 退出登录
* @param req
* @param resp
*/
private void userOut(HttpServletRequest req,HttpServletResponse resp) {
HttpSession hs=req.getSession();
hs.invalidate();
try {
resp.sendRedirect("/infomanager/login.jsp");
} catch (IOException e) {
logger.debug("退出重定向错误");
}
}
/**
* 用户登录验证
* @param req
* @param resp
*/
private void checkUserLogin(HttpServletRequest req,HttpServletResponse resp) {
//得到页面中输入的用户名和密码
String name=req.getParameter("uname");
String pwd=req.getParameter("pwd");
System.out.println(name+":"+pwd);
User user=usi.checkUserLoginService(name, pwd);
if(user!=null) {
try {
HttpSession hs=req.getSession();
hs.setAttribute("user", user);
resp.sendRedirect("/infomanager/main/main.jsp");
return;
} catch (IOException e) {
logger.debug("进入主页重定向失败");
}
}else {
req.setAttribute("flag2", "success");
/*
* HttpSession hs=req.getSession(); hs.setAttribute("flag", 0);
*/
try {
req.getRequestDispatcher("/login.jsp").forward(req, resp);
return;
} catch (ServletException e) {
logger.debug("请求转发失败");
} catch (IOException e) {
logger.debug("请求转发失败");
}
}
}
}
Dao层实现与数据库的交互
package hu.web.dao.impl;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import hu.web.dao.UserDao;
import hu.web.pojo.User;
public class UserDaoImpl implements UserDao{
/**
* 登录验证
*/
public User checkUserLoginDao(String name, String pwd) {
Connection conn=null;
PreparedStatement ps=null;
ResultSet rs=null;
User u=null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/test?"
+ "serverTimezone=Asia/Shanghai&useSSL=false"
, "scott", "123456");
String sql="select * from t_user where uname=? and pwd=?";
ps=conn.prepareStatement(sql);
ps.setString(1, name);
ps.setString(2, pwd);
rs=ps.executeQuery();
while(rs.next()) {
u=new User();
u.setUid(rs.getInt("uid"));
u.setAge(rs.getInt("age"));
u.setBirth(rs.getString("birth"));
u.setPwd(rs.getString("pwd"));
u.setSex(rs.getString("sex"));
u.setUname(rs.getString("uname"));
}
} catch (Exception e) {
e.printStackTrace();
}finally {
if(rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(ps!=null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!=null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return u;
}
/**
* 更新密码
*/
public int updatePwdDao(int id, String pwd) {
Connection conn=null;
PreparedStatement ps=null;
int num=0;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/test?"
+ "serverTimezone=Asia/Shanghai&useSSL=false"
, "scott", "123456");
String sql="update t_user set pwd=? where uid=?";
ps=conn.prepareStatement(sql);
ps.setString(1, pwd);
ps.setInt(2, id);
num=ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
if(ps!=null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!=null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return num;
}
/**
* 获得所有用户信息
*/
public List<User> useShowDao() {
Connection conn=null;
PreparedStatement ps=null;
ResultSet rs=null;
List<User> list=null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/test?"
+ "serverTimezone=Asia/Shanghai&useSSL=false"
, "scott", "123456");
String sql="select * from t_user";
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
list=new ArrayList<User>();
while(rs.next()) {
User u=new User();
u.setUid(rs.getInt("uid"));
u.setAge(rs.getInt("age"));
u.setBirth(rs.getString("birth"));
u.setPwd(rs.getString("pwd"));
u.setSex(rs.getString("sex"));
u.setUname(rs.getString("uname"));
list.add(u);
}
} catch (Exception e) {
e.printStackTrace();
}finally {
if(rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(ps!=null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!=null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return list;
}
/**
* 用户注册
*/
public int userRegDao(User user) {
Connection conn=null;
PreparedStatement ps=null;
int num=0;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/test?"
+ "serverTimezone=Asia/Shanghai&useSSL=false"
, "scott", "123456");
String sql="insert into t_user values(default,?,?,?,?,?)";
ps=conn.prepareStatement(sql);
ps.setString(1, user.getUname());
ps.setString(2, user.getPwd());
ps.setString(3, user.getSex());
ps.setInt(4, user.getAge());
ps.setString(5, user.getBirth());
num=ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
if(ps!=null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!=null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return num;
}
}
完整项目代码
https://github.com/StudyRecording/InfoManager