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
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=${user.id }">修改</a>
<a href="" onclick="del('bathPath')">删除</a></td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</body>
</html>
(7)add.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>add product</title>
</head> <body>
<div align="center">
<h1>add user</h1>
<form action="${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>
5.效果展示
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