我弄了一个设置界面的背景
在<title>后面加上<style>body{background:url(images/1.jpg)}</style>，其中1.jsp是在WebContent文件目录下，自己新建了一个文件夹叫做images
其中，jsp界面怎么设置背景可以参考链接：https://jingyan.baidu.com/article/9989c746c0d308f648ecfe09.html
另外，登录界面的代码如下：
<%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7 <title>家庭记账本</title>
8 <style>
9 body{background:url(images/1.jpg)}
10 </style>
11 </head>
12 <body>
13 <center>
14 <br><br><br><br><br><br><br>
15 <h1 style="color:black">家庭记账本</h1>
16 <form action="Servlet?method=Login" method="post">
17 <tr>
18 <td>用户名</td>
19 <td><input type="text" name="num" id="num"></td>
20 </tr>
21 <br><br>
22 <tr>
23 <td>密码</td>
24 <td><input type="password" name="password" id="password"></td>
25 </tr>
26 <br><br>
27 <tr>
28 <td>用户</td>
29 <td>
30 <select id="user" name="user">
31 <option>管理员</option>
32 <option>普通用户</option>
33 </select>
34 </td>
35 </tr>
36 <br><br>
37 <tr>
38 <td><input type="submit" value="登录"></td>
39 </tr>
40 </form>
41 </center>
42 </body>
43 </html>
servlet里面的Login代码为：
1 public void Login(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {
2 request.setCharacterEncoding("utf-8");
3 response.setCharacterEncoding("utf-8");
4 String num=request.getParameter("num");
5 System.out.println(num);
6 String password=request.getParameter("password");
7 System.out.println(password);
8 String user=request.getParameter("user");
9 System.out.println(user);
10 if(dao.Login(num,password,user)) {
11 System.out.println("dao层验证成功");
12 HttpSession session=request.getSession();
13 session.setAttribute("loginnum",num);
14 String loginnum=(String)session.getAttribute("loginnum");
15 System.out.println(loginnum);
16 if(user.equals("管理员")) {
17 System.out.println("进入管理员功能页");
18 request.getRequestDispatcher("admin.jsp").forward(request, response);
19 }else if(user.equals("用户")) {
20 System.out.println("进入用户功能页");
21 request.getRequestDispatcher("user.jsp").forward(request,response);
22 }else {
23 System.out.println("进入功能页失败");
24 request.getRequestDispatcher("login.jsp").forward(request, response);
25 }
26 }else {
27 System.out.println("dao层验证失败");
28 request.getRequestDispatcher("login.jsp").forward(request,response);
29 }
30 }
dao里面得Login代码：
1 public boolean Login(String num,String password,String user) {
2 String sql="select num,password,user from login";
3 Connection conn=Database.getConnection();
4 Statement stmt=null;
5 try {
6 stmt=conn.createStatement();
7 ResultSet rs=stmt.executeQuery(sql);
8 while(rs.next()) {
9 //用户输入的信息和数据库中的信息做比较，判断输入是否正确；
10 String Num=rs.getString("num");
11 System.out.println("从数据库获取的num为:"+Num);
12 String pwd=rs.getString("password");
13 System.out.println("从数据库获取的password为:"+pwd);
14 String us=rs.getString("user");
15 System.out.println("从数据库获取的user为:"+us);
16 if(Num.trim().compareTo(num)==0&&pwd.trim().compareTo(password)==0&&us.trim().compareTo(user)==0) {
17 return true;
18 }
19 }
20 rs.close();
21 }catch(Exception e) {
22 e.printStackTrace();
23 }
24 return false;
25 }
另外，还在user里面定义了User类以及Consume类：
User.java
1 public class User {
2 private String num;//用户名
3 private String password;//密码
4 private String sex;//性别
5 private String age;//年龄
6 private String phone;//电话
7 private String time;//注册时间
8 public User() {}
9 public User(String num,String password,String sex,String age,String phone,String time) {
10 super();
11 this.num=num;
12 this.password=password;
13 this.sex=sex;
14 this.age=age;
15 this.phone=phone;
16 this.time=time;
17 }
18 public String getNum() {
19 return num;
20 }
21 public void setNum(String num) {
22 this.num = num;
23 }
24 public String getPassword() {
25 return password;
26 }
27 public void setPassword(String password) {
28 this.password = password;
29 }
30 public String getSex() {
31 return sex;
32 }
33 public void setSex(String sex) {
34 this.sex = sex;
35 }
36 public String getAge() {
37 return age;
38 }
39 public void setAge(String age) {
40 this.age = age;
41 }
42 public String getPhone() {
43 return phone;
44 }
45 public void setPhone(String phone) {
46 this.phone = phone;
47 }
48 public String getTime() {
49 return time;
50 }
51 public void setTime(String time) {
52 this.time = time;
53 }
54 }
Consume.java
1 public class Consume {
2 private String conName;//名称
3 private String conType;//账单类型
4 private String conTime;//时间
5 private String conMoney;//金额
6 private String conNote;//备注
7 public Consume() {}
8 public Consume(String conName,String conType,String conTime,String conMoney,String conNote) {
9 super();
10 this.conName=conName;
11 this.conType=conType;
12 this.conTime=conTime;
13 this.conMoney=conMoney;
14 this.conNote=conNote;
15 }
16 public String getConName() {
17 return conName;
18 }
19 public void setConName(String conName) {
20 this.conName = conName;
21 }
22 public String getConType() {
23 return conType;
24 }
25 public void setConType(String conType) {
26 this.conType = conType;
27 }
28 public String getConTime() {
29 return conTime;
30 }
31 public void setConTime(String conTime) {
32 this.conTime = conTime;
33 }
34 public String getConMoney() {
35 return conMoney;
36 }
37 public void setConMoney(String conMoney) {
38 this.conMoney = conMoney;
39 }
40 public String getConNote() {
41 return conNote;
42 }
43 public void setConNote(String conNote) {
44 this.conNote = conNote;
45 }
46
47 }