1.建一个web文件，在里面分三层，分别是实体层；DAO层，DAO层里面包含BaseDAO（数据访问层）和DAO层；还有一个servlet层，处理数据逻辑层！
一、实体层，建立两个实体，一个members，和一个product：
1 package com.chinasoft.jsptest.entity;
2
3 public class Menbers {
4 private int id;
5 private String name;
6 private String pwd;
7 private String email;
8 private String born;
9 private String sex;
10
11 public Menbers() {
12 super();
13 // TODO Auto-generated constructor stub
14 }
15
16 public Menbers(String name, String pwd, String email, String born,
17 String sex) {
18 super();
19 this.name = name;
20 this.pwd = pwd;
21 this.email = email;
22 this.born = born;
23 this.sex = sex;
24 }
25
26 public String getEmail() {
27 return email;
28 }
29
30 public void setEmail(String email) {
31 this.email = email;
32 }
33
34 public String getBorn() {
35 return born;
36 }
37
38 public void setBorn(String born) {
39 this.born = born;
40 }
41
42 public String getSex() {
43 return sex;
44 }
45
46 public void setSex(String sex) {
47 this.sex = sex;
48 }
49
50 public int getId() {
51 return id;
52 }
53
54 public void setId(int id) {
55 this.id = id;
56 }
57
58 public String getName() {
59 return name;
60 }
61
62 public void setName(String name) {
63 this.name = name;
64 }
65
66 public String getPwd() {
67 return pwd;
68 }
69
70 public void setPwd(String pwd) {
71 this.pwd = pwd;
72 }
73 }
1 package com.chinasoft.jsptest.entity;
2
3 public class Product {
4 public int id ;
5 public String name ;
6 public String money ;
7 public int getId() {
8 return id;
9 }
10 public void setId(int id) {
11 this.id = id;
12 }
13 public String getName() {
14 return name;
15 }
16 public void setName(String name) {
17 this.name = name;
18 }
19 public String getMoney() {
20 return money;
21 }
22 public void setMoney(String money) {
23 this.money = money;
24 }
25
26
27
28
29 }
二、DAO层
1.BaseDAO
1 package com.chinasofti.jsptest.dao;
2
3 import java.sql.Connection;
4 import java.sql.DriverManager;
5 import java.sql.PreparedStatement;
6 import java.sql.ResultSet;
7 import java.sql.SQLException;
8
9
10 public class BaseDAO {
11 //1.链接数据库
12 String className="com.microsoft.sqlserver.jdbc.SQLServerDriver";
13 String connectionString="jdbc:sqlserver://127.0.0.1;DatabaseName=JspTest";
14 String username="sa";
15 String userpwd="123456";
16
17 private Connection conn;
18 private PreparedStatement pst;
19 private ResultSet rst;
20
21 //2. 链接上表
22 public BaseDAO(){
23 try {
24 Class.forName(className);
25 } catch (ClassNotFoundException e) {
26 // TODO Auto-generated catch block
27 e.printStackTrace();
28 }
29 }
30 public void getconnection(){
31 try {
32 conn=DriverManager.getConnection(connectionString,username,userpwd);
33 } catch (SQLException e) {
34 e.printStackTrace();
35 }
36 }
37
38 public ResultSet ExecuteQuest(String sql){
39 getconnection();
40 return ExecuteQuest(sql,new Object[]{});
41 }
42 public ResultSet ExecuteQuest(String sql, Object[] params) {
43 getconnection();
44 try {
45 pst=conn.prepareStatement(sql);
46 } catch (SQLException e) {
47 // TODO Auto-generated catch block
48 e.printStackTrace();
49 }
50 for(int i=0;i<params.length;i++){
51 try {
52
53 pst.setObject(i+1, params[i]);
54 } catch (SQLException e) {
55 // TODO Auto-generated catch block
56 e.printStackTrace();
57 }
58 }
59 try {
60 rst=pst.executeQuery();
61 } catch (SQLException e) {
62 // TODO Auto-generated catch block
63 e.printStackTrace();
64 }
65 return rst;
66 }
67
68
69 public int ExecuteUpdate(String sql){
70 getconnection();
71 return ExecuteUpdate(sql,new Object[]{});
72 }
73 public int ExecuteUpdate(String sql,Object[] params){
74 getconnection();
75 int result=0;
76 try {
77 pst=conn.prepareStatement(sql);
78 } catch (SQLException e) {
79 e.printStackTrace();
80 }
81 for(int i=0;i<params.length;i++){
82 try {
83 pst.setObject(i+1, params[i]);
84 } catch (SQLException e) {
85 // TODO Auto-generated catch block
86 e.printStackTrace();
87 }
88 }
89 try {
90 result=pst.executeUpdate();
91 } catch (SQLException e) {
92 // TODO Auto-generated catch block
93 e.printStackTrace();
94 }
95 return result;
96 }
97
98
99 public void CloseAll(){
100 try{
101 if(!rst.isClosed()){
102 rst.close();
103 }
104 if(!pst.isClosed()){
105 pst.close();
106 }
107 if(!conn.isClosed()){
108 conn.close();
109 }
110 }catch(Exception e){
111 System.out.println(e.getMessage());
112 }
113 }
114
115
116 }
2.DAO
1 package com.chinasofti.jsptest.dao;
2
3 import java.sql.ResultSet;
4 import java.sql.SQLException;
5 import java.util.ArrayList;
6 import java.util.List;
7 import com.chinasoft.jsptest.entity.Menbers;
8
9 public class MenbersDAO {
10 //1.new一个
11 private BaseDAO dao = new BaseDAO();
12 //2.增加ExecuteUpdate;
13 public void Add(Menbers meb){
14 String sql = "insert into [test]([id],[name],[pwd],[email],[born],[sex]) values (?,?,?,?,?,?)";
15 Object[] params=new Object[]{meb.getId(),meb.getName(),meb.getPwd(),meb.getEmail(),meb.getBorn(),meb.getSex()};
16 dao.ExecuteUpdate(sql,params);
17 }
18 //3.删除ExecuteUpdate;
19 public void Delete(Menbers meb){
20 String sql = "delete from [test] where [id]=?";
21 Object[] params = new Object[]{meb.getId()};
22 dao.ExecuteUpdate(sql,params);
23 }
24 //4.修改ExecuteUpdate;
25 public void Update(Menbers meb){
26 String sql="update [tset] set [name]=?,[pwd]=? WHERE [id]=?";
27 Object [] params=new Object[]{meb.getName(),meb.getPwd(),meb.getId()};
28 dao.ExecuteUpdate(sql,params);
29 }
30 //5.查找全部ExecuteQuest;
31 public List<Menbers> getselect(){
32 List<Menbers> result=new ArrayList<Menbers>();
33 String sql="SELECT [id],[name],[pwd] ,[email],[sex]FROM [test]";
34 ResultSet rst=dao.ExecuteQuest(sql);
35 try{
36 while(rst.next()){
37 Menbers temp=new Menbers();
38 temp.setId(rst.getInt(1));
39 temp.setName(rst.getString(2));
40 temp.setPwd(rst.getString(3));
41 temp.setEmail(rst.getString(4));
42 temp.setSex(rst.getString(5));
43 result.add(temp);
44 }
45 } catch (SQLException e) {
46 // TODO Auto-generated catch block
47 e.printStackTrace();
48 }
49 dao.CloseAll();
50 return result;
51 }
52 //6.按照ID查找ExecuteQuest;
53 public Menbers getSelectid(int id){
54 Menbers result=null;
55 String sql="SELECT [id],[name],[pwd] FROM [test] WHERE [id]=?";
56 Object[] params=new Object[]{id};
57 ResultSet rst=dao.ExecuteQuest(sql,params);
58 try {
59 if(rst.next()){
60 result = new Menbers();
61 result.setId(rst.getInt(1));
62 result.setName(rst.getString(2));
63 result.setPwd(rst.getString(3));
64 }
65 } catch (SQLException e) {
66 // TODO Auto-generated catch block
67 e.printStackTrace();
68 }
69 dao.CloseAll();
70 return result;
71 }
72 //7.按照name查找ExecuteQuest;
73 public Menbers getSelectname(String name){
74 Menbers result=null;
75 String sql="SELECT [id],[name],[pwd] FROM [test] WHERE [name]=?";
76 Object[] params=new Object[]{name};
77 ResultSet rst=dao.ExecuteQuest(sql,params);
78 try {
79 if(rst.next()){
80 result = new Menbers();
81 result.setId(rst.getInt(1));
82 result.setName(rst.getString(2));
83 result.setPwd(rst.getString(3));
84 }
85 } catch (SQLException e) {
86 // TODO Auto-generated catch block
87 e.printStackTrace();
88 }
89 dao.CloseAll();
90 return result;
91 }
92
93
94 }
MembersDAO
1 package com.chinasofti.jsptest.dao;
2
3 import java.sql.ResultSet;
4 import java.sql.SQLException;
5 import java.util.ArrayList;
6 import java.util.List;
7
8 import com.chinasoft.jsptest.entity.Product;
9
10
11
12 public class ProductDAO {
13 private BaseDAO dao = new BaseDAO();
14 //1.增加
15 public void Add(Product put){
16 String sql ="insert into [Product]([name],[money]) values(?,?)";
17 Object[] params = new Object[]{put.getName(),put.getMoney()};
18 dao.ExecuteUpdate(sql, params);
19 }
20 //2.删除
21 public void delete(int id){
22 String sql ="delete [Product] where [id]=?";
23 Object[] params = new Object[]{id};
24 dao.ExecuteUpdate(sql, params);
25 }
26 //3.更改
27 public void Update (Product put){
28 String sql ="update [Product] set [name]=?,[money]=? where [id]=?";
29 Object[] params = new Object[]{put.getName(),put.getMoney(),put.getId()};
30 dao.ExecuteUpdate(sql, params);
31 }
32 //4.查找全部
33 public List <Product > getSelect(){
34 List <Product> result=new ArrayList<Product>();
35 String sql ="select [id] ,[name],[money] from [Product] ";
36 ResultSet rst = dao.ExecuteQuest(sql);
37 try {
38 while (rst.next()){
39 Product pro = new Product();
40 pro.setId(rst.getInt(1));
41 pro.setName(rst.getString(2));
42 pro.setMoney(rst.getString(3));
43 result.add(pro);
44 }
45 } catch (SQLException e) {
46 // TODO Auto-generated catch block
47 e.printStackTrace();
48 }
49 dao.CloseAll();
50 return result;
51 }
52 //5.根据name查找
53 public Product getname(String name){
54 Product pro = null;
55 Object [] params = new Object[]{name};
56 String sql ="select [name],[money],[id] from [Product] where[name]=? ";
57 ResultSet rst = dao.ExecuteQuest(sql,params);
58 try {
59 while (rst.next()){
60 pro = new Product();
61 pro.setId(rst.getInt(1));
62 pro.setName(rst.getString(2));
63 pro.setMoney(rst.getString(3));
64 }
65 } catch (SQLException e) {
66 // TODO Auto-generated catch block
67 e.printStackTrace();
68 }
69 dao.CloseAll();
70 return pro;
71
72 }
73
74
75
76
77 }
ProductDAO
三、servlet层 需要建servlet类,里面会直接生成servlet/xxxx地址。这样在访问的时候，就直接访问这个地址
1.登录注册的逻辑判断层，主要注意request的用法；还有就是跳转jsp以后，jsp用post方法提交到的action地址，是servlet映射的地址！这个在WebRoot-web-inf-web.hml可以找到
1 package com.chinasofti.jsptest.servlet;
2
3 import java.io.IOException;
4
5 import javax.servlet.ServletException;
6 import javax.servlet.http.HttpServlet;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 import com.chinasoft.jsptest.entity.Menbers;
11 import com.chinasofti.jsptest.dao.MenbersDAO;
12
13 @SuppressWarnings("serial")
14 public class goset extends HttpServlet {
15
16 /**
17 * Constructor of the object.
18 */
19 public goset() {
20 super();
21 }
22
23 /**
24
25 */
26 public void destroy() {
27 super.destroy(); // Just puts "destroy" string in log
28 // Put your code here
29 }
30
31 /**
32 *
33 *
34 * This method is called when a form has its tag value method equals to get.
35 *
36 * @param request
37 * the request send by the client to the server
38 * @param response
39 * the response send by the server to the client
40 * @throws ServletException
41 * if an error occurred
42 * @throws IOException
43 * if an error occurred
44 */
45 public void doGet(HttpServletRequest request, HttpServletResponse response)
46 throws ServletException, IOException {
47 request.getRequestDispatcher("../go30-1.jsp").forward(request, response);//指向你要过去的JSP，进行逻辑判断以后，以post方法，进行下面的逻辑判断
48 }
49
50 /**
51 *
52 *
53 * This method is called when a form has its tag value method equals to
54 * post.
55 *
56 * @param request
57 * the request send by the client to the server
58 * @param response
59 * the response send by the server to the client
60 * @throws ServletException
61 * if an error occurred
62 * @throws IOException
63 * if an error occurred
64 */
65 public void doPost(HttpServletRequest request, HttpServletResponse response)
66 throws ServletException, IOException {
67 request.setCharacterEncoding("utf-8");
68 String name = request.getParameter("name");
69 String pwd = request.getParameter("pwd");
70 String emai = request.getParameter("email");
71 String born = request.getParameter("born");
72 String sex = request.getParameter("sex");
73 String type = request.getParameter("type");
74 if ("login".equals(type)) {
75 MenbersDAO dao = new MenbersDAO();
76 Menbers m = dao.getSelectname(name);
77 if (m != null && m.getPwd().equals(pwd)) {
78 request.setAttribute("title", "登陆成功");
79 request.setAttribute("retn", "欢迎你," + name + "。");
80 request.getRequestDispatcher("../go30-2.jsp").forward(request,
81 response);//指向你要过去的JSP
82 } else if (m != null && !m.getPwd().endsWith(pwd)) {
83 request.setAttribute("title", "登陆失败");
84 request.setAttribute("retn", "用户名或密码错误！请重新登录 ");
85 request.getRequestDispatcher("../go30-3.jsp").forward(request,
86 response);//指向你要过去的JSP
87 } else {
88 request.setAttribute("retn", "你不是公司员工，请入职以后再登入");
89 request.getRequestDispatcher("../go30-4.jsp").forward(request,
90 response);//指向你要过去的JSP
91 }
92 } else if ("register".equals(type)) {
93 Menbers m = new Menbers(name, pwd, emai, born, sex);
94 MenbersDAO dao = new MenbersDAO();
95 dao.Add(m);
96 request.getRequestDispatcher("../go30-4.jsp").forward(request,
97 response);//指向你要过去的JSP
98 }
99
100 }
101
102 /**
103 *
104 * @throws ServletException
105 * if an error occurs
106 */
107 public void init() throws ServletException {
108 // Put your code here
109 }
110
111 }
goset.java
2.显示全部界面，只用看get方法就好了
1 package com.chinasofti.jsptest.servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import java.util.List;
6
7 import javax.servlet.ServletException;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11
12 import com.chinasoft.jsptest.entity.Product;
13 import com.chinasofti.jsptest.dao.ProductDAO;
14
15 public class ProductSevlet extends HttpServlet {
16
17 /**
18 * Constructor of the object.
19 */
20 public ProductSevlet() {
21 super();
22 }
23
24 public void destroy() {
25 super.destroy(); // Just puts "destroy" string in log
26 // Put your code here
27 }
28
29 public void doGet(HttpServletRequest request, HttpServletResponse response)
30 throws ServletException, IOException {
31 ProductDAO dao = new ProductDAO();
32 List<Product> ms= dao.getSelect();
33 request.setAttribute("Model", ms);
34 request.getRequestDispatcher("../Product.jsp").forward(request, response);
35
36 }
37
38 /**
39 * The doPost method of the servlet. <br>
40 *
41 * This method is called when a form has its tag value method equals to post.
42 *
43 * @param request the request send by the client to the server
44 * @param response the response send by the server to the client
45 * @throws ServletException if an error occurred
46 * @throws IOException if an error occurred
47 */
48 public void doPost(HttpServletRequest request, HttpServletResponse response)
49 throws ServletException, IOException {
50
51 response.setContentType("text/html");
52 PrintWriter out = response.getWriter();
53 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
54 out.println("<HTML>");
55 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
56 out.println(" <BODY>");
57 out.print(" This is ");
58 out.print(this.getClass());
59 out.println(", using the POST method");
60 out.println(" </BODY>");
61 out.println("</HTML>");
62 out.flush();
63 out.close();
64 }
65
66 /**
67 * Initialization of the servlet. <br>
68 *
69 * @throws ServletException if an error occurs
70 */
71 public void init() throws ServletException {
72 // Put your code here
73 }
74
75 }
ProducAction.java
1 package com.chinasofti.jsptest.servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import java.util.List;
6
7 import javax.servlet.ServletException;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11
12 import com.chinasoft.jsptest.entity.Menbers;
13 import com.chinasofti.jsptest.dao.MenbersDAO;
14
15 public class UserList extends HttpServlet {
16
17 /**
18 * Constructor of the object.
19 */
20 public UserList() {
21 super();
22 }
23
24 /**
25 * Destruction of the servlet. <br>
26 */
27 public void destroy() {
28 super.destroy(); // Just puts "destroy" string in log
29 // Put your code here
30 }
31
32 /**
33 * The doGet method of the servlet. <br>
34 *
35 * This method is called when a form has its tag value method equals to get.
36 *
37 * @param request the request send by the client to the server
38 * @param response the response send by the server to the client
39 * @throws ServletException if an error occurred
40 * @throws IOException if an error occurred
41 */
42 public void doGet(HttpServletRequest request, HttpServletResponse response)
43 throws ServletException, IOException {
44
45 MenbersDAO dao= new MenbersDAO();
46 List <Menbers> ms = dao.getselect();
47 request.setAttribute("Model", ms);
48 request.getRequestDispatcher("../UserList.jsp").forward(request, response);
49 }
50
51 /**
52 * The doPost method of the servlet. <br>
53 *
54 * This method is called when a form has its tag value method equals to post.
55 *
56 * @param request the request send by the client to the server
57 * @param response the response send by the server to the client
58 * @throws ServletException if an error occurred
59 * @throws IOException if an error occurred
60 */
61 public void doPost(HttpServletRequest request, HttpServletResponse response)
62 throws ServletException, IOException {
63
64 response.setContentType("text/html");
65 PrintWriter out = response.getWriter();
66 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
67 out.println("<HTML>");
68 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
69 out.println(" <BODY>");
70 out.print(" This is ");
71 out.print(this.getClass());
72 out.println(", using the POST method");
73 out.println(" </BODY>");
74 out.println("</HTML>");
75 out.flush();
76 out.close();
77 }
78
79 /**
80 * Initialization of the servlet. <br>
81 *
82 * @throws ServletException if an error occurs
83 */
84 public void init() throws ServletException {
85 // Put your code here
86 }
87
88 }
UserList.java
jsp界面，所有的显示界面
1 <form method="post" action="<%=request.getContextPath() %>/servlet/goset"> 2 <input type="hidden" name="type" value="login"> 3 <table border="0" align="center"> 4 <tr> 5 <td>用户名</td> 6 <td><input type="text" name="name"></td> 7 </tr> 8 <tr> 9 <td>密码</td> 10 <td><input type="password" name="pwd"></td> 11 </tr> 12 13 <tr> 14 <td colspan="2" align="center"><input type="submit" value="登录" /> 15 16 17 <input type="reset" value="取消" /></td> 18 </tr> 19 </table> 20 </form>
go30-1.jsp
1 <h1 align="center"> <%=title%> </h1> 2 <h3 align="center"> <%=retn%> </h3>
go30-2.jsp
1 <h1 align="center"> <%=retn%> </h1> 2 <form method="post"> 3 <table border="0" align="center" > 4 <tr> <td>用户名</td><td> <input type="text" name="name"></td></tr> 5 <tr><td>密码</td><td > <input type="password" name="pwd"> </td></tr> 6 7 <tr><td colspan="2" align="center"> 8 <input type="submit" value="登录" /> 9 10 <input type="reset" value="取消" /> 11 </td></tr> 12 </table> 13 </form>
go30-3.jsp
1 <h1 align="center"> 2 <%=retn%> 3 </h1> 4 <form method="post" action="<%=request.getContextPath() %>/servlet/goset"> 5 <input type="hidden" name="type" value="register"> 6 <table border="0" align="center"> 7 <tr> 8 <td>用户名</td> 9 <td><input type="text" name="name"></td> 10 </tr> 11 <tr> 12 <td>密码</td> 13 <td><input type="password" name="pwd"></td> 14 </tr> 15 <tr> 16 <td>邮箱</td> 17 <td><input type="text" name="email"></td> 18 </tr> 19 <tr> 20 <td>出生日期</td> 21 <td><input type="text" name="born"></td> 22 </tr> 23 <tr> 24 <td>性别</td> 25 <td>男<input type="radio" name="sex" value="男"> 女<input 26 type="radio" name="sex" value="女"></td> 27 </tr> 28 29 <tr> 30 <td colspan="2" align="center"><input type="submit" value="注册" /> 31 32 <input type="reset" value="取消" /></td> 33 </tr> 34 </table> 35 </form>
go30-4.jsp
1 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
2
3
4
5
6 <table>
7 <tr width="300">
8 <td width="100">id</td>
9 <td width="100">name</td>
10 <td width="100">money</td>
11 </tr>
12 <c:forEach var="m" items= "${Model}">
13 <tr>
14 <td>${m.id}</td>
15 <td>${m.name}</td>
16 <td>${m.email}</td>
17
18 </tr>
19 </c:forEach>
20
21 </table>
Product.jsp
1 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
2
3
4
5
6 <table>
7 <tr width="500">
8 <td width="100">id</td>
9 <td width="100">name</td>
10 <td width="100">pwd</td>
11 <td width="100">email</td>
12 <td width="100">born</td>
13 <td width="100">sex</td>
14 </tr>
15 <c:forEach var="m" items= "${Model}">
16 <tr>
17 <td >${m.id}</td>
18 <td >${m.name}</td>
19 <td >${m.pwd}</td>
20 <td >${m.email}</td>
21 <td >${m.born}</td>
22 <td >${m.sex}</td>
23
24 </tr>
25 </c:forEach>
26
27 </table>
UserLise.jsp
时间： 2024-10-17 13:09:28