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

1.new web project

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2.给新建的web项目添加struts2支持

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3.项目结构中有了struts.xml和struts2核心库

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4.编码

　　4.1项目结构图

　　　

　　

　　4.2源代码：

　　（1）DbUtil

 package com.phome.crud;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 /**
  * 数据库工具类
  * @author yangzl
  *
  */
 public class DbUtil
 {

     //驱动名
     private static final String Driver = "com.mysql.jdbc.Driver";
     //数据库连接路径
     private static final String URL = "jdbc:mysql://localhost:3306/user";
     //数据库连接用户名及密码
     private static final String user = "root";
     private static final String password = "root";

     /**
      * 加载数据库驱动
      * @throws ClassNotFoundException（加载异常）
      */
     private static void registerDriver() throws ClassNotFoundException
     {
         try
         {
             Class.forName(Driver);
         }
         catch (ClassNotFoundException e)
         {
             System.out.println((new StringBuilder("【加载数据库驱动时，发生异常】\n")).append(e.getMessage()).toString());
             throw e;
         }
     }

     /**
      * 得到数据库连接
      * @return
      * @throws SQLException
      * @throws ClassNotFoundException
      */
     public static Connection getConnection()
         throws SQLException, ClassNotFoundException
     {
         Connection conn = null;
         try
         {
             registerDriver();
             conn = DriverManager.getConnection(URL, user, password);
         }
         catch (SQLException e)
         {
             System.out.println((new StringBuilder("【得到数据库连接时，发生异常】\n")).append(e.getMessage()).toString());
             throw e;
         }
         return conn;
     }

     public static int executeUpdate(String sql, Object args[])
     {
         int rows;
         rows = -1;
         Connection conn = null;
         PreparedStatement pst = null;
          try {
             conn=getConnection();
             pst=conn.prepareStatement(sql);
             if (args != null)
                 {
                     for (int i = 0; i < args.length; i++)
                         pst.setObject(i + 1, args[i]);

                 }
                 rows = pst.executeUpdate();
                 close(pst);
                 close(conn);
                 return rows;
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
          return -1;
     }

     public static void close(Connection conn)
         throws SQLException
     {
         if (conn != null)
             try
             {
                 conn.close();
             }
             catch (SQLException e)
             {
                 System.out.println((new StringBuilder("【数据库连接对象在关闭时，发生异常！】\n【异常信息】")).append(e.getMessage()).toString());
                 throw e;
             }
     }

     public static void close(Statement state)
         throws SQLException
     {
         if (state != null)
             try
             {
                 state.close();
             }
             catch (SQLException e)
             {
                 System.out.println((new StringBuilder("【SQL命令对象在关闭时，发生异常！】\n【异常信息】")).append(e.getMessage()).toString());
                 throw e;
             }
     }

     public static void close(PreparedStatement pst)
         throws SQLException
     {
         if (pst != null)
             try
             {
                 pst.close();
             }
             catch (SQLException e)
             {
                 System.out.println((new StringBuilder("【预处理SQL命令对象在关闭时，发生异常！】\n【异常信息】")).append(e.getMessage()).toString());
                 throw e;
             }
     }

     public static void close(ResultSet rs)
         throws SQLException
     {
         if (rs != null)
             try
             {
                 rs.close();
             }
             catch (SQLException e)
             {
                 System.out.println((new StringBuilder("【关闭结果集对象时发生异常!】\n【异常信息】")).append(e.getMessage()).toString());
                 throw e;
             }
     }
 }

　　(2)UserBean.java

 package com.phome.crud;

 public class UserBean {
     private int id;
     private String loginid;
     private String loginpwd;
     private String name;
     private String gender;
     private int age;
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getLoginid() {
         return loginid;
     }
     public void setLoginid(String loginid) {
         this.loginid = loginid;
     }
     public String getLoginpwd() {
         return loginpwd;
     }
     public void setLoginpwd(String loginpwd) {
         this.loginpwd = loginpwd;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getGender() {
         return gender;
     }
     public void setGender(String gender) {
         this.gender = gender;
     }
     public int getAge() {
         return age;
     }
     public void setAge(int age) {
         this.age = age;
     }

 }

　　(3).UserDao.java

 package com.phome.crud;

 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;

 public class UserDao {
     public List<UserBean> list_users(){
         List<UserBean> list = new ArrayList<UserBean>();
         String sql = "select * from users";

         try {
             Connection conn = DbUtil.getConnection();
             PreparedStatement pst = conn.prepareStatement(sql);
             ResultSet rs = pst.executeQuery();
             while(rs.next()){
                 UserBean user = new UserBean();
                 user.setId(rs.getInt("id"));
                 user.setLoginid(rs.getString("loginid"));
                 user.setLoginpwd(rs.getString("loginpwd"));
                 user.setName(rs.getString("name"));
                 user.setGender(rs.getString("gender"));
                 user.setAge(rs.getInt("age"));

                 list.add(user);
             }
             rs.close();
             pst.close();
             conn.close();
         } catch (SQLException e) {
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }
         return list;
     }

     public UserBean getUser(int id){
         UserBean user = new UserBean();
         String sql = "select * from users where id = " + id;

         try {
             Connection conn = DbUtil.getConnection();
             PreparedStatement pst = conn.prepareStatement(sql);
             ResultSet rs = pst.executeQuery();
             while(rs.next()){
                 user.setId(rs.getInt("id"));
                 user.setLoginid(rs.getString("loginid"));
                 user.setLoginpwd(rs.getString("loginpwd"));
                 user.setName(rs.getString("name"));
                 user.setGender(rs.getString("gender"));
                 user.setAge(rs.getInt("age"));

             }
             rs.close();
             pst.close();
             conn.close();
         } catch (SQLException e) {
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }

         return user;
     }

     public int edit(UserBean user,int id){
         String sql = "UPDATE users SET name=?,gender=?,age=? WHERE id="+id;

         try {
             Connection conn = DbUtil.getConnection();
             PreparedStatement pst = conn.prepareStatement(sql);

             pst.setString(1,user.getName());
             pst.setString(2,user.getGender());
             pst.setInt(3,user.getAge());

             int rows = pst.executeUpdate();

             pst.close();
             conn.close();
             return rows;
         } catch (SQLException e) {
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }
         return -1;
     }

     public int add(UserBean user){
         String sql = "INSERT INTO users VALUES(DEFAULT,?,?,?,?,?)";

         try {
             Connection conn = DbUtil.getConnection();
             PreparedStatement pst = conn.prepareStatement(sql);

             pst.setString(1,user.getLoginid());
             pst.setString(2,user.getLoginpwd());
             pst.setString(3,user.getName());
             pst.setString(4,user.getGender());
             pst.setInt(5,user.getAge());

             int rows = pst.executeUpdate();

             pst.close();
             conn.close();
             return rows;
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (ClassNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return -1;
     }
 }

　　(4)UserAction.java

 package com.phome.crud;

 import java.util.List;

 import javax.servlet.http.HttpSession;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 public class UserAction extends ActionSupport {
     List<UserBean> users = null;
     public List<UserBean> getUsers() {
         return users;
     }
     public void setUsers(List<UserBean> users) {
         this.users = users;
     }

     UserBean user = new UserBean();
     public UserBean getUser() {
         return user;
     }
     public void setUser(UserBean user) {
         this.user = user;
     }

     UserDao dao = new UserDao();

     public String list_users(){
         HttpSession s = ServletActionContext.getRequest().getSession();

         users = dao.list_users();
         s.setAttribute("users", users);
         System.out.println(users.toArray());
         return SUCCESS;
     }

     public String get(){
         int id = Integer.parseInt(ServletActionContext.getRequest().getParameter("id"));
         //HttpSession s = ServletActionContext.getRequest().getSession();
         user = dao.getUser(id);
         //s.setAttribute("user", user);
         return SUCCESS;
     }
     public String edit(){
         int id = Integer.parseInt(ServletActionContext.getRequest().getParameter("id"));
         dao.edit(user, id);
         return SUCCESS;
     }
     public String add(){
         dao.add(user);
         return SUCCESS;
     }
 }

　　(5)struts.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
 <struts>
     <package name="suibian" extends="struts-default" namespace="/">
         <action name="Test" class="com.phome.test.TestAction" method="excute">
             <result name="success">/list.jsp</result>

         </action>
     </package>

     <package name="list" extends="struts-default" namespace="/">
         <action name="list" class="com.phome.crud.UserAction" method="list_users">
             <result name="success">/list.jsp</result>
         </action>
         <action name="get" class="com.phome.crud.UserAction" method="get">
             <result name="success">/edit.jsp</result>
         </action>
         <action name="edit" class="com.phome.crud.UserAction" method="edit">
             <result name="success" type="redirectAction">list</result>
         </action>
         <action name="add" class="com.phome.crud.UserAction" method="add">
             <result name="success" type="redirectAction">list</result>
         </action>
     </package>
 </struts>    

　　(6)list.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 <%@ taglib  prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

 <%
     String path = request.getContextPath();
     String basePath = request.getScheme() + "://"
             + request.getServerName() + ":" + request.getServerPort()
             + path + "/";
 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
   <head>
     <title>User List</title>

     <script type="text/javascript">
     function del(src) {
         if (confirm("确定要删除吗？")) {
             window.location.href(src);
             return;
         }
     }
 </script>
   </head>

   <body>
    <div align="center">
       <h1>用户列表</h1>
       <a href="add.jsp"><strong>添加用户</strong></a><br/><br/>
     <table align="center" border="1" cellspacing="0" cellpadding="0">
        <thead style="background-color: #eeeeee">
          <tr>
            <th width="200px" >ID</th>
            <th width="200px" >姓名</th>
            <th width="200px" >性别</th>
            <th width="200px" >年龄</th>
            <th width="200px" >操作</th>
          </tr>
        </thead>
        <tbody>
         <c:forEach items="${users}" var="user">
          <tr height="15px">
            <td align="center">${user.id }</td>
            <td align="center">${user.name }</td>
            <td align="center">${user.gender }</td>
            <td align="center">${user.age }</td>
            <td align="center"><a href="${pageContext.request.contextPath }/get.action?id=${user.id }">修改</a>&nbsp;&nbsp;
                <a href="" onclick="del('bathPath')">删除</a></td>
          </tr>
         </c:forEach>
        </tbody>
     </table>
    </div>
   </body>
 </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

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

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
   <head>
     <title>update user</title>
   </head>

   <body>
    <div align="center">
    <h1>修改user</h1>
    <form action="${pageContext.request.contextPath }/edit.action?id=${user.id }" method="post">
        <input type="hidden" name="user.id" value="${user.id }"/>
        <input type="hidden" name="user.loginid" value="${user.loginid }"/>
        <input type="hidden" name="user.loginpwd" value="${user.loginpwd }"/>
        <table>
          <tr>
            <td width="80px">姓名：</td>
              <td><input type="text" name="user.name" value="${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="修改"/></td>
       </tr>
        </table>
    </form>
    </div>
   </body>
 </html>

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5.效果展示