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Java——Struts2 crud 简单实例(学习struts2和ssh) 用Myeclipse实现

1.new web project

2.给新建的web项目添加struts2支持

3.项目结构中有了struts.xml和struts2核心库

4.编码

　　4.1项目结构图

　　4.2源代码：

　　（1）DbUtil

  1 package com.phome.crud;
  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 import java.sql.Statement;
  9 /**
 10  * 数据库工具类
 11  * @author yangzl
 12  *
 13  */
 14 public class DbUtil
 15 {
 16 
 17     //驱动名
 18     private static final String Driver = "com.mysql.jdbc.Driver";
 19     //数据库连接路径
 20     private static final String URL = "jdbc:mysql://localhost:3306/user";
 21     //数据库连接用户名及密码
 22     private static final String user = "root";
 23     private static final String password = "root";
 24     
 25     /**
 26      * 加载数据库驱动
 27      * @throws ClassNotFoundException（加载异常）
 28      */
 29     private static void registerDriver() throws ClassNotFoundException
 30     {
 31         try
 32         {
 33             Class.forName(Driver);
 34         }
 35         catch (ClassNotFoundException e)
 36         {
 37             System.out.println((new StringBuilder("【加载数据库驱动时，发生异常】
")).append(e.getMessage()).toString());
 38             throw e;
 39         }
 40     }
 41 
 42     /**
 43      * 得到数据库连接
 44      * @return
 45      * @throws SQLException
 46      * @throws ClassNotFoundException
 47      */
 48     public static Connection getConnection()
 49         throws SQLException, ClassNotFoundException
 50     {
 51         Connection conn = null;
 52         try
 53         {
 54             registerDriver();
 55             conn = DriverManager.getConnection(URL, user, password);
 56         }
 57         catch (SQLException e)
 58         {
 59             System.out.println((new StringBuilder("【得到数据库连接时，发生异常】
")).append(e.getMessage()).toString());
 60             throw e;
 61         }
 62         return conn;
 63     }
 64 
 65     public static int executeUpdate(String sql, Object args[])
 66     {
 67         int rows;
 68         rows = -1;
 69         Connection conn = null;
 70         PreparedStatement pst = null;
 71          try {
 72             conn=getConnection();
 73             pst=conn.prepareStatement(sql);
 74             if (args != null)
 75                 {
 76                     for (int i = 0; i < args.length; i++)
 77                         pst.setObject(i + 1, args[i]);
 78         
 79                 }
 80                 rows = pst.executeUpdate();
 81                 close(pst);
 82                 close(conn);
 83                 return rows;
 84         } catch (SQLException e) {
 85             // TODO Auto-generated catch block
 86             e.printStackTrace();
 87         } catch (ClassNotFoundException e) {
 88             // TODO Auto-generated catch block
 89             e.printStackTrace();
 90         }
 91          return -1;
 92     }
 93 
 94     public static void close(Connection conn)
 95         throws SQLException
 96     {
 97         if (conn != null)
 98             try
 99             {
100                 conn.close();
101             }
102             catch (SQLException e)
103             {
104                 System.out.println((new StringBuilder("【数据库连接对象在关闭时，发生异常！】
【异常信息】")).append(e.getMessage()).toString());
105                 throw e;
106             }
107     }
108 
109     public static void close(Statement state)
110         throws SQLException
111     {
112         if (state != null)
113             try
114             {
115                 state.close();
116             }
117             catch (SQLException e)
118             {
119                 System.out.println((new StringBuilder("【SQL命令对象在关闭时，发生异常！】
【异常信息】")).append(e.getMessage()).toString());
120                 throw e;
121             }
122     }
123 
124     public static void close(PreparedStatement pst)
125         throws SQLException
126     {
127         if (pst != null)
128             try
129             {
130                 pst.close();
131             }
132             catch (SQLException e)
133             {
134                 System.out.println((new StringBuilder("【预处理SQL命令对象在关闭时，发生异常！】
【异常信息】")).append(e.getMessage()).toString());
135                 throw e;
136             }
137     }
138 
139     public static void close(ResultSet rs)
140         throws SQLException
141     {
142         if (rs != null)
143             try
144             {
145                 rs.close();
146             }
147             catch (SQLException e)
148             {
149                 System.out.println((new StringBuilder("【关闭结果集对象时发生异常!】
【异常信息】")).append(e.getMessage()).toString());
150                 throw e;
151             }
152     }
153 }

　　(2)UserBean.java

 1 package com.phome.crud;
 2 
 3 public class UserBean {
 4     private int id;
 5     private String loginid;
 6     private String loginpwd;
 7     private String name;
 8     private String gender;
 9     private int age;
10     public int getId() {
11         return id;
12     }
13     public void setId(int id) {
14         this.id = id;
15     }
16     public String getLoginid() {
17         return loginid;
18     }
19     public void setLoginid(String loginid) {
20         this.loginid = loginid;
21     }
22     public String getLoginpwd() {
23         return loginpwd;
24     }
25     public void setLoginpwd(String loginpwd) {
26         this.loginpwd = loginpwd;
27     }
28     public String getName() {
29         return name;
30     }
31     public void setName(String name) {
32         this.name = name;
33     }
34     public String getGender() {
35         return gender;
36     }
37     public void setGender(String gender) {
38         this.gender = gender;
39     }
40     public int getAge() {
41         return age;
42     }
43     public void setAge(int age) {
44         this.age = age;
45     }
46     
47 }

　　(3).UserDao.java

  1 package com.phome.crud;
  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 public class UserDao {
 11     public List<UserBean> list_users(){
 12         List<UserBean> list = new ArrayList<UserBean>();
 13         String sql = "select * from users";
 14         
 15         try {
 16             Connection conn = DbUtil.getConnection();
 17             PreparedStatement pst = conn.prepareStatement(sql);
 18             ResultSet rs = pst.executeQuery();
 19             while(rs.next()){
 20                 UserBean user = new UserBean();
 21                 user.setId(rs.getInt("id"));
 22                 user.setLoginid(rs.getString("loginid"));
 23                 user.setLoginpwd(rs.getString("loginpwd"));
 24                 user.setName(rs.getString("name"));
 25                 user.setGender(rs.getString("gender"));
 26                 user.setAge(rs.getInt("age"));
 27                 
 28                 list.add(user);
 29             }
 30             rs.close();
 31             pst.close();
 32             conn.close();
 33         } catch (SQLException e) {
 34             e.printStackTrace();
 35         } catch (ClassNotFoundException e) {
 36             e.printStackTrace();
 37         }
 38         return list;
 39     }
 40     
 41     public UserBean getUser(int id){
 42         UserBean user = new UserBean();
 43         String sql = "select * from users where id = " + id;
 44         
 45         try {
 46             Connection conn = DbUtil.getConnection();
 47             PreparedStatement pst = conn.prepareStatement(sql);
 48             ResultSet rs = pst.executeQuery();
 49             while(rs.next()){
 50                 user.setId(rs.getInt("id"));
 51                 user.setLoginid(rs.getString("loginid"));
 52                 user.setLoginpwd(rs.getString("loginpwd"));
 53                 user.setName(rs.getString("name"));
 54                 user.setGender(rs.getString("gender"));
 55                 user.setAge(rs.getInt("age"));
 56                 
 57             }
 58             rs.close();
 59             pst.close();
 60             conn.close();
 61         } catch (SQLException e) {
 62             e.printStackTrace();
 63         } catch (ClassNotFoundException e) {
 64             e.printStackTrace();
 65         }
 66         
 67         return user;
 68     }
 69     
 70     public int edit(UserBean user,int id){
 71         String sql = "UPDATE users SET name=?,gender=?,age=? WHERE id="+id;
 72         
 73         try {
 74             Connection conn = DbUtil.getConnection();
 75             PreparedStatement pst = conn.prepareStatement(sql);
 76             
 77             pst.setString(1,user.getName());
 78             pst.setString(2,user.getGender());
 79             pst.setInt(3,user.getAge());
 80             
 81             int rows = pst.executeUpdate();
 82             
 83             pst.close();
 84             conn.close();
 85             return rows;
 86         } catch (SQLException e) {
 87             e.printStackTrace();
 88         } catch (ClassNotFoundException e) {
 89             e.printStackTrace();
 90         }
 91         return -1;
 92     }
 93     
 94     public int add(UserBean user){
 95         String sql = "INSERT INTO users VALUES(DEFAULT,?,?,?,?,?)";
 96         
 97         try {
 98             Connection conn = DbUtil.getConnection();
 99             PreparedStatement pst = conn.prepareStatement(sql);
100             
101             pst.setString(1,user.getLoginid());
102             pst.setString(2,user.getLoginpwd());
103             pst.setString(3,user.getName());
104             pst.setString(4,user.getGender());
105             pst.setInt(5,user.getAge());
106             
107             int rows = pst.executeUpdate();
108             
109             pst.close();
110             conn.close();
111             return rows;
112         } catch (SQLException e) {
113             // TODO Auto-generated catch block
114             e.printStackTrace();
115         } catch (ClassNotFoundException e) {
116             // TODO Auto-generated catch block
117             e.printStackTrace();
118         }
119         return -1;
120     }
121 }

　　(4)UserAction.java

 1 package com.phome.crud;
 2 
 3 import java.util.List;
 4 
 5 import javax.servlet.http.HttpSession;
 6 
 7 import org.apache.struts2.ServletActionContext;
 8 
 9 import com.opensymphony.xwork2.ActionSupport;
10 
11 public class UserAction extends ActionSupport {
12     List<UserBean> users = null;
13     public List<UserBean> getUsers() {
14         return users;
15     }
16     public void setUsers(List<UserBean> users) {
17         this.users = users;
18     }
19     
20     UserBean user = new UserBean();
21     public UserBean getUser() {
22         return user;
23     }
24     public void setUser(UserBean user) {
25         this.user = user;
26     }
27 
28     UserDao dao = new UserDao();
29     
30     public String list_users(){
31         HttpSession s = ServletActionContext.getRequest().getSession();
32         
33         users = dao.list_users();
34         s.setAttribute("users", users);
35         System.out.println(users.toArray());
36         return SUCCESS;
37     }
38     
39     public String get(){
40         int id = Integer.parseInt(ServletActionContext.getRequest().getParameter("id"));
41         //HttpSession s = ServletActionContext.getRequest().getSession();
42         user = dao.getUser(id);
43         //s.setAttribute("user", user);
44         return SUCCESS;
45     }
46     public String edit(){
47         int id = Integer.parseInt(ServletActionContext.getRequest().getParameter("id"));
48         dao.edit(user, id);
49         return SUCCESS;
50     }
51     public String add(){
52         dao.add(user);
53         return SUCCESS;
54     }
55 }

　　(5)struts.xml

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
 3 <struts>
 4     <package name="suibian" extends="struts-default" namespace="/">
 5         <action name="Test" class="com.phome.test.TestAction" method="excute">
 6             <result name="success">/list.jsp</result>
 7             
 8         </action>
 9     </package>
10     
11     <package name="list" extends="struts-default" namespace="/">
12         <action name="list" class="com.phome.crud.UserAction" method="list_users">
13             <result name="success">/list.jsp</result>
14         </action>
15         <action name="get" class="com.phome.crud.UserAction" method="get">
16             <result name="success">/edit.jsp</result>
17         </action>
18         <action name="edit" class="com.phome.crud.UserAction" method="edit">
19             <result name="success" type="redirectAction">list</result>
20         </action>
21         <action name="add" class="com.phome.crud.UserAction" method="add">
22             <result name="success" type="redirectAction">list</result>
23         </action>
24     </package>
25 </struts>

　　(6)list.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <%@ taglib  prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 3 
 4 <%
 5     String path = request.getContextPath();
 6     String basePath = request.getScheme() + "://"
 7             + request.getServerName() + ":" + request.getServerPort()
 8             + path + "/";
 9 %>
10 
11 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
12 <html>
13   <head>
14     <title>User List</title>
15     
16     <script type="text/javascript">
17     function del(src) {
18         if (confirm("确定要删除吗？")) {
19             window.location.href(src);
20             return;
21         }
22     }
23 </script>
24   </head>
25   
26   <body>
27    <div align="center">
28       <h1>用户列表</h1>
29       <a href="add.jsp"><strong>添加用户</strong></a><br/><br/>
30     <table align="center" border="1" cellspacing="0" cellpadding="0">
31        <thead style="background-color: #eeeeee">
32          <tr>
33            <th width="200px" >ID</th>
34            <th width="200px" >姓名</th>
35            <th width="200px" >性别</th>
36            <th width="200px" >年龄</th>
37            <th width="200px" >操作</th>
38          </tr>
39        </thead>
40        <tbody>
41         <c:forEach items="${users}" var="user">
42          <tr height="15px">
43            <td align="center">${user.id }</td>
44            <td align="center">${user.name }</td>
45            <td align="center">${user.gender }</td>
46            <td align="center">${user.age }</td>
47            <td align="center"><a href="${pageContext.request.contextPath }/get.action?id=${user.id }">修改</a>&nbsp;&nbsp;
48                <a href="" onclick="del('bathPath')">删除</a></td>
49          </tr>
50         </c:forEach>
51        </tbody>
52     </table>
53    </div>
54   </body>
55 </html>

　　(7)add.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>add product</title>
  </head>
  
  <body>
   <div align="center">
   <h1>add user</h1>
   <form action="${pageContext.request.contextPath }/add.action" method="post">
       <table>
         <tr>
           <td width="80px">登陆名：</td>
             <td><input type="text" name="user.loginid" value="${user.loginid }"/></td>
      </tr>
         <tr>
           <td width="80px">登陆密码：</td>
             <td><input type="text" name="user.loginpwd" value="${user.loginpwd }"/></td>
      </tr>
         <tr>
           <td width="80px">姓名：</td>
             <td><input type="text" name="user.name" value="${user.name }"/></td>
      </tr>
         <tr>
           <td width="80px">性别：</td>
             <td><input type="text" name="user.gender" value="${user.gender }"/></td>
      </tr>
         <tr>
           <td width="80px">年龄：</td>
             <td><input type="text" name="user.age" value="${user.age }"/></td>
      </tr>
         
         <tr>
             <td><a href="${pageContext.request.contextPath }/list.action">返回</a></td>
             <td><input type="submit" value="添加"/></td>
      </tr>
       </table>
   </form>
   </div>
  </body>
</html>

　　（8）edit.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <title>update user</title>
 7   </head>
 8   
 9   <body>
10    <div align="center">
11    <h1>修改user</h1>
12    <form action="${pageContext.request.contextPath }/edit.action?id=${user.id }" method="post">
13        <input type="hidden" name="user.id" value="${user.id }"/>
14        <input type="hidden" name="user.loginid" value="${user.loginid }"/>
15        <input type="hidden" name="user.loginpwd" value="${user.loginpwd }"/>
16        <table>
17          <tr>
18            <td width="80px">姓名：</td>
19              <td><input type="text" name="user.name" value="${user.name }"/></td>
20       </tr>
21          <tr>
22            <td width="80px">性别：</td>
23              <td><input type="text" name="user.gender" value="${user.gender }"/></td>
24       </tr>
25          <tr>
26            <td width="80px">年龄：</td>
27              <td><input type="text" name="user.age" value="${user.age }"/></td>
28       </tr>
29          
30          <tr>
31              <td><a href="${pageContext.request.contextPath }/list.action">返回</a></td>
32              <td><input type="submit" value="修改"/></td>
33       </tr>
34        </table>
35    </form>
36    </div>
37   </body>
38 </html>

5.效果展示

逃避不一定躲得过,面对不一定最难过

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原文地址：https://www.cnblogs.com/yangzhenlong/p/3354987.html