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  • javaWebDemo

    一：设计数据库

        1)新建数据库（我这里用的是MySQL）

    /*
    Navicat MySQL Data Transfer

    Source Server : localhost_3306
    Source Server Version : 50022
    Source Host : localhost:3306
    Source Database : a

    Target Server Type : MYSQL
    Target Server Version : 50022
    File Encoding : 65001

    Date: 2017-09-28 09:19:33
    */

    SET FOREIGN_KEY_CHECKS=0;

    -- ----------------------------
    -- Table structure for user
    -- ----------------------------
    DROP TABLE IF EXISTS `user`;
    CREATE TABLE `user` (
    `userid` int(11) NOT NULL,
    `name` varchar(20) default NULL,
    `sex` varchar(10) default NULL,
    `age` int(11) default NULL,
    PRIMARY KEY (`userid`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

    -- ----------------------------
    -- Records of user
    -- ----------------------------
    INSERT INTO `user` VALUES ('1', 'torry', '女', '21');
    INSERT INTO `user` VALUES ('2', 'tom', '男', '21');
    INSERT INTO `user` VALUES ('3', '李元芳', '女', '20');

    二：mvc模式

    1)数据库连接

     1 package com.qiu.demo.dbc;
 2 
 3 import javax.sql.DataSource;
 4 
 5 import org.apache.commons.dbcp.BasicDataSource;
 6 
 7 public class DataSourceHolder {
 8 //基本数据源
 9 BasicDataSource ds = new BasicDataSource();
10 //构造方法加载数据库驱动
11 public DataSourceHolder(){
12 ds.setDriverClassName("com.mysql.jdbc.Driver");
13 ds.setUrl("jdbc:mysql://localhost:3306/a?useUnicode=true&characterEnxoding=gb2312");
14 ds.setUsername("root");
15 ds.setPassword("root");
16 }
17 //内部单例类，实例化DataSourceHolder的对象
18 private static class SingletonHolder{
19 private static DataSourceHolder instance = new DataSourceHolder();
20 }
21 //获得内部类中的实例化好的外部类对象
22 public static DataSourceHolder getInstance(){
23 return SingletonHolder.instance;
24 }
25 //获得数据源对象
26 public DataSource getDataSource(){
27 return ds;
28 }
29 }
    数据库连接

     

    2)实体类

     1 package com.qiu.demo.vo;
 2 
 3 public class UserModel {
 4 private int userId;
 5 private String name;
 6 private String sex;
 7 private int age;
 8 //-----------------
 9 public int getUserId() {
10 return userId;
11 }
12 public void setUserId(int userId) {
13 this.userId = userId;
14 }
15 public String getName() {
16 return name;
17 }
18 public void setName(String name) {
19 this.name = name;
20 }
21 public String getSex() {
22 return sex;
23 }
24 public void setSex(String sex) {
25 this.sex = sex;
26 }
27 public int getAge() {
28 return age;
29 }
30 public void setAge(int age) {
31 this.age = age;
32 }
33 //---------------------
34 @Override
35 public int hashCode() {
36 // TODO Auto-generated method stub
37 final int prime=31;
38 int result = 1;
39 result = prime*result+userId;
40 return result;
41 }
42 @Override
43 public boolean equals(Object obj) {
44 // TODO Auto-generated method stub
45 if(this == obj){
46 return true;
47 }
48 if(obj==null){
49 return false;
50 }
51 if(this.getClass() != obj.getClass()){
52 return false;
53 }
54 final UserModel other = (UserModel)obj;
55 if(userId != other.userId){
56 return false;
57 }
58 return true;
59 }
60 }

    3)Dao层

     1 package com.qiu.demo.dao;
 2 
 3 import java.util.List;
 4 
 5 import com.qiu.demo.vo.UserModel;
 6 
 7 public interface UserDao {
 8     //查询所有，返回集合
 9     public List<UserModel> findAll();
10     //删除
11     public void delete(int userId);
12     //添加
13     public void add(UserModel usermodel);
14     //根据id查询信息
15     public UserModel findById(int userId);
16     //修改信息
17     public void edit(UserModel usermodel);
18     //条件组合查询
19     public List<UserModel> findgroup(UserModel usermodel);
20 }
    UserDao

    4)Dao实现

      1 package com.qiu.demo.dao.impl;
  2 
  3 import java.sql.Connection;
  4 import java.sql.PreparedStatement;
  5 import java.sql.ResultSet;
  6 import java.sql.SQLException;
  7 import java.util.ArrayList;
  8 import java.util.List;
  9 
 10 import com.qiu.demo.dao.UserDao;
 11 import com.qiu.demo.dbc.DataSourceHolder;
 12 import com.qiu.demo.vo.UserModel;
 13 
 14 public class UserDaoImpl implements UserDao {
 15 
 16     @Override
 17     public List<UserModel> findAll() {
 18         Connection conn = null;
 19         List<UserModel> userList = new ArrayList<UserModel>();
 20         try{
 21             conn = DataSourceHolder.getInstance().getDataSource().getConnection();
 22             String sql ="SELECT userId,name,sex,age FROM user";
 23             PreparedStatement ps =conn.prepareStatement(sql);
 24             ResultSet res = ps.executeQuery();
 25             while(res.next()){
 26                 UserModel user = this.rs2Model(res);
 27                 userList.add(user);
 28             }
 29             res.close();
 30             ps.close();
 31         }catch(Exception e){
 32             e.printStackTrace();
 33         }finally{
 34             try {
 35                 conn.close();
 36             } catch (SQLException e) {
 37                 // TODO Auto-generated catch block
 38                 e.printStackTrace();
 39             }
 40         }
 41         return userList;
 42     }
 43     //----------------------------查询多数的方法封装
 44         private UserModel rs2Model(ResultSet res)throws Exception{
 45             UserModel user = new UserModel();
 46             user.setUserId(res.getInt("userId"));
 47             user.setName(res.getString("name"));
 48             user.setSex(res.getString("sex"));
 49             user.setAge(res.getInt("age"));
 50             return user;
 51         }
 52     //------------------------------删除
 53         @Override
 54         public void delete(int userId) {
 55             Connection conn = null;
 56             
 57             try{
 58                 conn = DataSourceHolder.getInstance().getDataSource().getConnection();
 59                 String sql ="DELETE FROM user WHERE userId=?";
 60                 PreparedStatement ps =conn.prepareStatement(sql);
 61                 ps.setInt(1, userId);
 62                 ps.execute();
 63                 ps.close();
 64             }catch(Exception e){
 65                 e.printStackTrace();
 66             }finally{
 67                 try {
 68                     conn.close();
 69                 } catch (SQLException e) {
 70                     // TODO Auto-generated catch block
 71                     e.printStackTrace();
 72                 }
 73             }
 74             
 75         }
 76         //-------------------------------添加
 77         @Override
 78         public void add(UserModel usermodel) {
 79             Connection conn = null;
 80             try{
 81                 conn = DataSourceHolder.getInstance().getDataSource().getConnection();
 82                 String sql ="INSERT INTO user (userId,name,sex,age) VALUES (?,?,?,?) ";
 83                 PreparedStatement ps = conn.prepareStatement(sql);
 84                 int count =1;
 85                 ps.setInt(count++, usermodel.getUserId());
 86                 ps.setString(count++, usermodel.getName());
 87                 ps.setString(count++, usermodel.getSex());
 88                 ps.setInt(count++, usermodel.getAge());
 89                 ps.executeUpdate();
 90                 ps.close();
 91             }catch(Exception e){
 92                 e.printStackTrace();
 93             }finally{
 94                 try {
 95                     conn.close();
 96                 } catch (SQLException e) {
 97                     // TODO Auto-generated catch block
 98                     e.printStackTrace();
 99                 }
100             }
101             
102         }
103         //----------------------按id查询
104         @Override
105         public UserModel findById(int userId) {
106             Connection conn = null;
107             UserModel user = new UserModel();
108             try{
109                 conn = DataSourceHolder.getInstance().getDataSource().getConnection();
110                 String sql ="SELECT userId,name,sex,age FROM user WHERE userId=?";
111                 PreparedStatement ps =conn.prepareStatement(sql);
112                 ps.setInt(1, userId);
113                 ResultSet res = ps.executeQuery();
114                 if(res.next()){
115                    user = this.rs2Model(res);
116                 }
117                 res.close();
118                 ps.close();
119             }catch(Exception e){
120                 e.printStackTrace();
121             }finally{
122                 try {
123                     conn.close();
124                 } catch (SQLException e) {
125                     // TODO Auto-generated catch block
126                     e.printStackTrace();
127                 }
128             }
129             return user;
130         }
131         //------------------修改信息
132         @Override
133         public void edit(UserModel usermodel) {
134             Connection conn = null;
135             try{
136                 conn = DataSourceHolder.getInstance().getDataSource().getConnection();
137                 String sql ="UPDATE user SET name=?,sex=?,age=? WHERE userId=?";
138                 PreparedStatement ps =conn.prepareStatement(sql);
139                 int count =1;
140                 ps.setString(count++,usermodel.getName());
141                 ps.setString(count++,usermodel.getSex());
142                 ps.setInt(count++, usermodel.getAge());
143                 ps.setInt(count++, usermodel.getUserId());
144                 ps.executeUpdate();
145                 ps.close();
146             }catch(Exception e){
147                 e.printStackTrace();
148             }finally{
149                 try {
150                     conn.close();
151                 } catch (SQLException e) {
152                     // TODO Auto-generated catch block
153                     e.printStackTrace();
154                 }
155             }
156             
157         }
158         //------------------组合查询优化版
159         @Override
160         public List<UserModel> findgroup(UserModel usermodel) {
161             Connection conn = null;
162             List<UserModel> userList = new ArrayList<UserModel>();
163             try{
164                 conn = DataSourceHolder.getInstance().getDataSource().getConnection();
165                 String sql ="SELECT userId,name,sex,age FROM user WHERE 1=1 "+this.generateWhere(usermodel);
166                 PreparedStatement ps =conn.prepareStatement(sql);
167                 this.priparedPs(usermodel, ps);
168                 System.out.println(sql);
169                 ResultSet res = ps.executeQuery();
170                 while(res.next()){
171                     UserModel user = this.rs2Model(res);
172                     userList.add(user);
173                 }
174                 res.close();
175                 ps.close();
176             }catch(Exception e){
177                 e.printStackTrace();
178             }finally{
179                 try {
180                     conn.close();
181                 } catch (SQLException e) {
182                     // TODO Auto-generated catch block
183                     e.printStackTrace();
184                 }
185             }
186             return userList;
187             
188         }
189         //----------------------------条件组合用到的方法
190         private String generateWhere(UserModel usermodel){
191             StringBuffer buf = new StringBuffer();
192             if(usermodel.getUserId()> 0){
193                 buf.append(" AND userId= ? ");
194             }
195             if(usermodel.getName()!=null && usermodel.getName().trim().length()>0){
196                 buf.append(" AND name LIKE ? ");
197                 
198             }
199             if(usermodel.getSex()!=null && usermodel.getSex().trim().length()>0){
200                 buf.append(" AND sex= ? ") ;
201                 
202             }
203             if(usermodel.getAge()>0){
204                 buf.append(" AND age = ? ");
205             }
206             return buf.toString();
207         }
208         private void priparedPs(UserModel usermodel,PreparedStatement ps)throws Exception{
209             int count=1;
210             if(usermodel.getUserId()>0){
211                 ps.setInt(count++, usermodel.getUserId());
212             }
213             if(usermodel.getName()!=null && usermodel.getName().trim().length()>0){
214                 ps.setString(count++, "%"+usermodel.getName()+"%");
215             }
216             if(usermodel.getSex()!=null && usermodel.getSex().trim().length()>0){
217                 ps.setString(count++, usermodel.getSex());
218             }
219             if(usermodel.getAge()>0){
220                 ps.setInt(count++, usermodel.getAge());
221             }
222         } 
223 
224 }
    UserDaoImpl

    5)代理工厂

     1 package com.qiu.demo.dao.factory;
 2 
 3 import java.lang.reflect.InvocationHandler;
 4 import java.lang.reflect.Method;
 5 import java.lang.reflect.Proxy;
 6 
 7 import com.qiu.demo.dao.UserDao;
 8 import com.qiu.demo.dao.impl.UserDaoImpl;
 9 
10 public class UserDaoProxyFactory implements InvocationHandler {
11     //实现InvocationHandler 
12     //位于的包是java.lang.reflect.InvocationHandler
13         private UserDao us;
14         public UserDaoProxyFactory(UserDao us){
15              this.us = us;
16         }
17         public UserDao getUserServiceProxy(){
18             //生成动态代理
19             UserDao usProxy =(UserDao)Proxy.newProxyInstance(UserDao.class.getClassLoader(),UserDaoImpl.class.getInterfaces(),this );
20             return usProxy;
21         }
22         @Override
23         public Object invoke(Object proxy, Method method, Object[] args)
24                 throws Throwable {
25             //进行事务处理操作        
26             Object invoke = method.invoke(us, args);
27             return invoke;
28         }
29 
30 }
    factory

            6)Servlet

     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import java.util.ArrayList;
 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.qiu.demo.dao.UserDao;
13 import com.qiu.demo.dao.factory.UserDaoProxyFactory;
14 import com.qiu.demo.dao.impl.UserDaoImpl;
15 import com.qiu.demo.vo.UserModel;
16 
17 /**
18  * 查询所有信息到list页面
19  */
20 public class ListServlet extends HttpServlet {
21     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
22         // 查询所有信息
23         request.setCharacterEncoding("gb2312");
24         List<UserModel> userList = new ArrayList<UserModel>();
25         //-----------------
26         UserDao us= new UserDaoImpl();
27         UserDaoProxyFactory factory = new UserDaoProxyFactory(us);
28         UserDao usProxy = factory.getUserServiceProxy();
29         userList=usProxy.findAll();
30         //-----------------存入作用域
31         request.setAttribute("userList", userList);
32         request.getRequestDispatcher("list.jsp").forward(request, response);
33         
34     }
35     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
36         this.doGet(request, response);
37     }
38 
39 }
    ListServlet
     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import java.util.ArrayList;
 5 import java.util.List;
 6 
 7 import javax.servlet.ServletException;
 8 import javax.servlet.annotation.WebServlet;
 9 import javax.servlet.http.HttpServlet;
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12 
13 import com.qiu.demo.dao.UserDao;
14 import com.qiu.demo.dao.factory.UserDaoProxyFactory;
15 import com.qiu.demo.dao.impl.UserDaoImpl;
16 import com.qiu.demo.vo.UserModel;
17 
18 /**
19  * 条件组合查询
20  */
21 @WebServlet("/UserFindServlet")
22 public class UserFindServlet extends HttpServlet {
23     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
24         request.setCharacterEncoding("gb2312");
25         System.out.println("qqqqqqqqqqqqqqqq");
26         List<UserModel> userList = new ArrayList<UserModel>();
27         //-------------------------------
28         int userId = Integer.parseInt(request.getParameter("userId"));
29         System.out.println(userId);
30         String name = request.getParameter("name");
31         System.out.println(name);
32         String sex = request.getParameter("sex");
33         System.out.println(sex);
34         int age =Integer.parseInt(request.getParameter("age"));
35         //------------封装数据
36         UserModel usermodel = new UserModel();
37         usermodel.setUserId(userId);
38         usermodel.setName(name);
39         usermodel.setSex(sex);
40         usermodel.setAge(age);
41         //-------------查询操作
42         UserDao us= new UserDaoImpl();
43         UserDaoProxyFactory factory = new UserDaoProxyFactory(us);
44         UserDao usProxy = factory.getUserServiceProxy();
45         userList = usProxy.findgroup(usermodel);
46         //-------------转发到list.jsp
47         request.setAttribute("userList", userList);
48         request.getRequestDispatcher("list.jsp").forward(request, response);
49     }
50     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
51         this.doGet(request, response);
52     }
53 
54 }
    UserFindServlet
     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 /**
11  * to添加页面
12  */
13 @WebServlet("/UserToAddServlet")
14 public class UserToAddServlet extends HttpServlet {
15     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
16         request.setCharacterEncoding("gb2312");
17         request.getRequestDispatcher("userAdd.jsp").forward(request, response);
18     }
19     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
20         this.doGet(request, response);
21     }
22 
23 }
    UserToAddServlet
     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 import com.qiu.demo.dao.UserDao;
11 import com.qiu.demo.dao.factory.UserDaoProxyFactory;
12 import com.qiu.demo.dao.impl.UserDaoImpl;
13 import com.qiu.demo.vo.UserModel;
14 
15 /**
16  * 添加操作
17  */
18 public class UserAddServlet extends HttpServlet {
19     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
20         // TODO Auto-generated method stub
21         request.setCharacterEncoding("gb2312");
22         int userId = Integer.parseInt(request.getParameter("userId"));
23         String name = request.getParameter("name");
24         String sex = request.getParameter("sex");
25         int age =Integer.parseInt(request.getParameter("age"));
26         //------------封装数据
27         UserModel usermodel = new UserModel();
28         usermodel.setUserId(userId);
29         usermodel.setName(name);
30         usermodel.setSex(sex);
31         usermodel.setAge(age);
32         //-------------添加操作
33         UserDao us= new UserDaoImpl();
34         UserDaoProxyFactory factory = new UserDaoProxyFactory(us);
35         UserDao usProxy = factory.getUserServiceProxy();
36         usProxy.add(usermodel);
37         //-------------重定向到ListServlet
38         response.sendRedirect("listServlet");
39     }
40     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
41         this.doGet(request, response);
42     }
43 
44 }
    UserAddServlet 
     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 import com.qiu.demo.dao.UserDao;
11 import com.qiu.demo.dao.factory.UserDaoProxyFactory;
12 import com.qiu.demo.dao.impl.UserDaoImpl;
13 import com.qiu.demo.vo.UserModel;
14 
15 /**
16  * Servlet implementation class UserToEditServlet
17  */
18 @WebServlet("/UserToEditServlet")
19 public class UserToEditServlet extends HttpServlet {
20     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
21         request.setCharacterEncoding("gb2312");
22         UserModel user = new UserModel();
23         //获取id
24         int userId = Integer.parseInt(request.getParameter("userId"));
25         //查询出信息
26         UserDao us= new UserDaoImpl();
27         UserDaoProxyFactory factory = new UserDaoProxyFactory(us);
28         UserDao usProxy = factory.getUserServiceProxy();
29         user=usProxy.findById(userId);
30         //-----------------存入作用域
31         request.setAttribute("user", user);
32         request.getRequestDispatcher("edit.jsp").forward(request, response);
33     }
34 
35     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
36         this.doGet(request, response);
37     }
38 
39 }
    UserToEditServlet
     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 import com.qiu.demo.dao.UserDao;
11 import com.qiu.demo.dao.factory.UserDaoProxyFactory;
12 import com.qiu.demo.dao.impl.UserDaoImpl;
13 import com.qiu.demo.vo.UserModel;
14 
15 /**
16  * 修改操作
17  */
18 @WebServlet("/UserEditServlet")
19 public class UserEditServlet extends HttpServlet {
20     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
21         request.setCharacterEncoding("gb2312");
22         int userId = Integer.parseInt(request.getParameter("userId"));
23         String name = request.getParameter("name");
24         String sex = request.getParameter("sex");
25         int age =Integer.parseInt(request.getParameter("age"));
26         //------------封装数据
27         UserModel usermodel = new UserModel();
28         usermodel.setUserId(userId);
29         usermodel.setName(name);
30         usermodel.setSex(sex);
31         usermodel.setAge(age);
32         //-------------修改操作
33         UserDao us= new UserDaoImpl();
34         UserDaoProxyFactory factory = new UserDaoProxyFactory(us);
35         UserDao usProxy = factory.getUserServiceProxy();
36         usProxy.edit(usermodel);
37         //-------------重定向到ListServlet
38         response.sendRedirect("listServlet");
39     }
40     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
41         this.doGet(request, response);
42     }
43 
44 }
    UserEditServlet
     1 package com.qiu.demo.servlet;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 import com.qiu.demo.dao.UserDao;
11 import com.qiu.demo.dao.factory.UserDaoProxyFactory;
12 import com.qiu.demo.dao.impl.UserDaoImpl;
13 
14 /**
15  * 删除操作
16  */
17 public class UserDelete extends HttpServlet {
18     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
19         request.setCharacterEncoding("gb2312");
20         int userId = Integer.parseInt(request.getParameter("userId"));
21         //-----------------------------删除
22         UserDao us= new UserDaoImpl();
23         UserDaoProxyFactory factory = new UserDaoProxyFactory(us);
24         UserDao usProxy = factory.getUserServiceProxy();
25         usProxy.delete(userId);
26         //-----------------------------重定向到listServlet
27         response.sendRedirect("listServlet");
28         
29     }
30     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
31         this.doGet(request, response);
32     }
33 
34 }
    UserDelete

    7)同步配置web.xml文件

    这里的配置是：每当6)有一个Servlet就相应在web.xml中写对应的配置(!!!切记)

     1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 3   <display-name>jdbcdemospring</display-name>
 4   <welcome-file-list>
 5     <welcome-file>index.html</welcome-file>
 6     <welcome-file>index.htm</welcome-file>
 7     <welcome-file>index.jsp</welcome-file>
 8     <welcome-file>default.html</welcome-file>
 9     <welcome-file>default.htm</welcome-file>
10     <welcome-file>default.jsp</welcome-file>
11   </welcome-file-list>
12   <servlet>
13     <servlet-name>listServlet</servlet-name>
14     <servlet-class>com.qiu.demo.servlet.ListServlet</servlet-class>
15   </servlet>
16   <servlet-mapping>
17     <servlet-name>listServlet</servlet-name>
18     <url-pattern>/listServlet</url-pattern>
19   </servlet-mapping>
20   <servlet>
21     <servlet-name>userDelete</servlet-name>
22     <servlet-class>com.qiu.demo.servlet.UserDelete</servlet-class>
23   </servlet>
24   <servlet-mapping>
25     <servlet-name>userDelete</servlet-name>
26     <url-pattern>/userDelete</url-pattern>
27   </servlet-mapping>
28   <servlet>
29     <servlet-name>userToAddServlet</servlet-name>
30     <servlet-class>com.qiu.demo.servlet.UserToAddServlet</servlet-class>
31   </servlet>
32   <servlet-mapping>
33     <servlet-name>userToAddServlet</servlet-name>
34     <url-pattern>/userToAddServlet</url-pattern>
35   </servlet-mapping>
36   <servlet>
37     <servlet-name>userAddServlet</servlet-name>
38     <servlet-class>com.qiu.demo.servlet.UserAddServlet</servlet-class>
39   </servlet>
40   <servlet-mapping>
41     <servlet-name>userAddServlet</servlet-name>
42     <url-pattern>/userAddServlet</url-pattern>
43   </servlet-mapping>
44   <servlet>
45     <servlet-name>userToEditServlet</servlet-name>
46     <servlet-class>com.qiu.demo.servlet.UserToEditServlet</servlet-class>
47   </servlet>
48   <servlet-mapping>
49     <servlet-name>userToEditServlet</servlet-name>
50     <url-pattern>/userToEditServlet</url-pattern>
51   </servlet-mapping>
52   <servlet>
53     <servlet-name>userEditServlet</servlet-name>
54     <servlet-class>com.qiu.demo.servlet.UserEditServlet</servlet-class>
55   </servlet>
56   <servlet-mapping>
57     <servlet-name>userEditServlet</servlet-name>
58     <url-pattern>/userEditServlet</url-pattern>
59   </servlet-mapping>
60   
61   
62   <servlet>
63     <servlet-name>userFindServlet</servlet-name>
64     <servlet-class>com.qiu.demo.servlet.UserFindServlet</servlet-class>
65   </servlet>
66   <servlet-mapping>
67     <servlet-name>userFindServlet</servlet-name>
68     <url-pattern>/userFindServlet</url-pattern>
69   </servlet-mapping>
70 </web-app>
    web.xml

            8)页面

           *这里按照个人习惯，我是每次用到一个小功能就写一个相应的页面 

     1 <%@ page language="java" contentType="text/html; charset=gb2312"
 2     pageEncoding="gb2312"%>
 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=gb2312">
 7 <title>主页做跳转</title>
 8 </head>
 9 <body>
10     <%
11         response.sendRedirect("listServlet");
12     %>
13 </body>
14 </html>
    index.jsp
     1 <%@ page language="java" contentType="text/html; charset=gb2312"
 2     pageEncoding="gb2312"%>
 3 <%@ page import="java.util.*" %>
 4 <%@ page import="com.qiu.demo.vo.UserModel" %>
 5 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 6 <html>
 7 <head>
 8 <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 9 <title>信息显示页面</title>
10 </head>
11 <body>
12      <form action=""  method="post">
13          <table>
14             <tr>
15                 <td>编号：</td>
16                 <td>姓名：</td>
17                 <td>性别：</td>
18                 <td>年龄：</td>
19                 <td>操作：</td>
20             </tr>
21              <%
22                 request.setCharacterEncoding("gb2312");
23              %>
24              <% 
25                     List<UserModel> userList = (List<UserModel>)request.getAttribute("userList");
26                     if(userList!=null){
27                     Iterator<UserModel> iter = userList.iterator();
28                     while(iter.hasNext()){
29                         UserModel user  = iter.next();
30              %>
31             <tr>
32                 <td><%=user.getUserId() %> </td>
33                 <td><%=user.getName() %> </td>
34                 <td><%=user.getSex() %> </td>
35                 <td><%=user.getAge() %> </td>
36                 <td><a href ="userToEditServlet?userId=<%=user.getUserId()%>">修改</a>|<a href ="javascript:if(confirm('你确定要删除吗？'))window.location.href='userDelete?userId=<%=user.getUserId()%>'">删除</a> </td>
37             </tr>
38              <%
39                      }
40                    }
41              %>    
42         </table>
43         <a href="userToAddServlet">添加用户</a>
44         <a href ="userFind.jsp">查询用户</a>
45             
46      </form>       
47 </body>
48 </html>
    list.jsp
     1 <%@ page language="java" contentType="text/html; charset=gb2312"
 2     pageEncoding="gb2312"%>
 3 <%@ page import="com.qiu.demo.vo.UserModel"%>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 8 <title>修改页面</title>
 9 </head>
10 <body>
11              <%
12                 request.setCharacterEncoding("gb2312");
13              %>
14              <% 
15                     UserModel user = (UserModel)request.getAttribute("user");
16                     if(user!=null){
17                     
18              %>
19                 <form action="userEditServlet" method="post">
20                     编号:<input type="text" name="userId" value="<%=user.getUserId() %>" readonly="readonly"/><br/>
21                     姓名:<input type="text" name="name" value="<%=user.getName() %>"/><br/>
22                     性别:<select name="sex">
23                             <option value="<%=user.getSex() %>">男</option>
24                             <option>女</option>
25                          </select><br/>
26                     年龄:<input type="text" name="age" value="<%=user.getAge() %>"><br/>
27                     <input type="submit" value="编辑"/>
28                 </form>
29              <%
30                      }
31              %>    
32     
33 </body>
34 </html>
    edit.jsp
     1 <%@ page language="java" contentType="text/html; charset=gb2312"
 2     pageEncoding="gb2312"%>
 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=gb2312">
 7 <title>添加页面</title>
 8 </head>
 9 <body>
10     <form action="userAddServlet" method="post">
11         编号:<input type="text" name="userId" value="0"/><br/>
12         姓名:<input type="text" name="name" /><br/>
13         性别:<select name="sex">
14                 <option>男</option>
15                 <option>女</option>
16              </select><br/>
17         年龄:<input type="text" name="age" value="0"><br/>
18         <input type="submit" value="添加"/>
19     </form>
20 </body>
21 </html>
    userAdd.jsp
     1 <%@ page language="java" contentType="text/html; charset=gb2312"
 2     pageEncoding="gb2312"%>
 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=gb2312">
 7 <title>条件查询页面</title>
 8 </head>
 9 <body>
10     <form action="userFindServlet" method="post">
11             编号:<input type="text" name="userId" value="0"/><br/>
12             姓名:<input type="text" name="name"/><br/>
13             性别:<select name="sex">
14                     <option value=""></option>
15                     <option>男</option>
16                     <option>女</option>
17                 </select><br/>
18             年龄:<input type="text" name="age" value="0"><br/>
19                  <input type="submit" value="查询"/>
20     </form>
21 </body>
22 </html>
    userFind.jsp

    三：发布运行

    　　　这里我用的是Tomcat v7.0,后面就不用多说了，什么调bug是程序员必备技能（纸上得来终觉浅，绝知此事要躬行）。

    四：感悟

          每个人写代码习惯不同，建议整理思路后再下手。

    五：我只是一只菜鸟，欢迎大神纠正（在此谢过）。

     

     

     

     
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  • 原文地址：https://www.cnblogs.com/qiuyingbo/p/7685828.html
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