Java简单用户管理系统

Dbutil.java

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package com.ceshi.util;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

/**

* 封装数据常用操作

* @author Administrator

*

*/

public class DbUtil {

/**

* 取得Connection

* @return

*/

public static Connection getConnection(){

Connection conn = null;

try {

Class.forName("oracle.jdbc.driver.OracleDriver");

String url = "jdbc:oracle:thin:@localhost:1521:orcl";

String username = "drp1";

String password = "drp1";

conn = DriverManager.getConnection(url,username,password);

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

return conn;

}

/**

* 关闭conn

* @param conn

*/

public static void close(Connection conn){

if(conn != null){

try {

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

/**

* 关闭PreparedStatement

* @param pstmt

*/

public static void close(PreparedStatement pstmt){

if(pstmt != null){

try {

pstmt.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

/**

* 关闭ResultSet

* @param pstmt

*/

public static void close(ResultSet rs ) {

if (rs != null) {

try {

rs.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

/**

* 测试数据库是否连接成功

* @param args

*/

public static void main(String args[]){

System.out.println("数据库连接成功！"+DbUtil.getConnection());

}

}

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PageModel.java

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package com.ceshi.util;

import java.util.List;

/**

* 封装分页信息

* @author Administrator

*

*/

public class PageModel<E> {

//结果集

private List<E> list;

//查询记录数

private int totalRecords;

//每页多少条数据

private int pageSize;

//第几页

private int pageNo;

/**

* 总页数

* @return

*/

public int getTotalPages() {

return (totalRecords + pageSize - 1) / pageSize;

}

/**

* 取得首页

* @return

*/

public int getTopPageNo() {

return 1;

}

/**

* 上一页

* @return

*/

public int getPreviousPageNo() {

if (pageNo <= 1) {

return 1;

}

return pageNo - 1;

}

/**

* 下一页

* @return

*/

public int getNextPageNo() {

if (pageNo >= getBottomPageNo()) {

return getBottomPageNo();

}

return pageNo + 1;

}

/**

* 取得尾页

* @return

*/

public int getBottomPageNo() {

return getTotalPages();

}

public List<E> getList() {

return list;

}

public void setList(List<E> list) {

this.list = list;

}

public int getTotalRecords() {

return totalRecords;

}

public void setTotalRecords(int totalRecords) {

this.totalRecords = totalRecords;

}

public int getPageSize() {

return pageSize;

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public int getPageNo() {

return pageNo;

}

public void setPageNo(int pageNo) {

this.pageNo = pageNo;

}

}

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UserManager.java

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package com.ceshi.manager;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Timestamp;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import com.ceshi.entity.User;

import com.ceshi.util.DbUtil;

import com.ceshi.util.PageModel;

/**

* 采用单例管理用户

* @author Administrator

*

*/

public class UserManager {

private static UserManager instance = new UserManager();

private UserManager(){}

/**

* 提供一个入口方法

* @return

*/

public static UserManager getInstance(){

return instance;

}

/**

* 添加用户的方法

* @param user

*/

public void addUser(User user){

String sql = "insert into t_user (user_id, user_name, password, contact_tel, email, create_date) values (?,?,?,?,?,?)";

Connection conn = null;

PreparedStatement pstmt = null;

try{

conn = DbUtil.getConnection();

pstmt = conn.prepareStatement(sql);

pstmt.setString(1, user.getUserId());

pstmt.setString(2, user.getUserName());

pstmt.setString(3, user.getPassword());

pstmt.setString(4, user.getContactTel());

pstmt.setString(5, user.getEmail());

pstmt.setTimestamp(6, new Timestamp(new Date().getTime()));//能保存年月日 时分秒

pstmt.executeQuery();

} catch(SQLException e) {

e.printStackTrace();

}finally {

DbUtil.close(pstmt);

DbUtil.close(conn);

}

}

/**

* 修改用户

* @param user

*/

public void modifyUser(User user) {

StringBuilder sbSql = new StringBuilder();

sbSql.append("update t_user ")

.append("set user_name = ?, ")

.append("password = ?, ")

.append("contact_tel = ?, ")

.append("email = ? ")

.append("where user_id = ? ");

Connection conn = null;

PreparedStatement pstmt = null;

try {

conn = DbUtil.getConnection();

pstmt = conn.prepareStatement(sbSql.toString());

pstmt.setString(1, user.getUserName());

pstmt.setString(2, user.getPassword());

pstmt.setString(3, user.getContactTel());

pstmt.setString(4, user.getEmail());

pstmt.setString(5, user.getUserId());

pstmt.executeUpdate();

}catch(SQLException e) {

e.printStackTrace();

}finally {

DbUtil.close(pstmt);

DbUtil.close(conn);

}

}

/**

* 根据用户代码删除

* @param userId

*/

public void delUser(String userId) {

String sql = "delete from t_user where user_id=?";

Connection conn = null;

PreparedStatement pstmt = null;

try {

conn = DbUtil.getConnection();

pstmt = conn.prepareStatement(sql);

pstmt.setString(1, userId);

pstmt.executeUpdate();

}catch(SQLException e) {

e.printStackTrace();

}finally {

DbUtil.close(pstmt);

DbUtil.close(conn);

}

}

/**

* 根据用户代码查询

* @param userId

* @return 如果存在返回User对象，否则返回null

*/

public User findUserById(String userId) {

String sql = "select user_id, user_name, password, contact_tel, email, create_date from t_user where user_id=?";

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

User user = null;

try {

conn = DbUtil.getConnection();

pstmt = conn.prepareStatement(sql);

pstmt.setString(1, userId);

rs = pstmt.executeQuery();

if (rs.next()) {

user = new User();

user.setUserId(rs.getString("user_id"));

user.setUserName(rs.getString("user_name"));

user.setPassword(rs.getString("password"));

user.setContactTel(rs.getString("contact_tel"));

user.setEmail(rs.getString("email"));

user.setCreateDate(rs.getTimestamp("create_date"));

}

}catch(SQLException e) {

e.printStackTrace();

}finally {

DbUtil.close(rs);

DbUtil.close(pstmt);

DbUtil.close(conn);

}

return user;

}

/**

* 分页查询

* @param pageNo 第几页

* @param pageSize 每页多少条数据

* @return pageModel

*/

public PageModel<User> findUserList(int pageNo, int pageSize) {

StringBuffer sbSql = new StringBuffer();

sbSql.append("select user_id, user_name, password, contact_tel, email, create_date ")

.append("from ")

.append("( ")

.append("select rownum rn, user_id, user_name, password, contact_tel, email, create_date ")

.append("from ")

.append("( ")

.append("select user_id, user_name, password, contact_tel, email, create_date from t_user where user_id <> 'root' order by user_id ")

.append(") where rownum <= ? ")

.append(") where rn > ? ");

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

PageModel<User> pageModel = null;

try {

conn = DbUtil.getConnection();

pstmt = conn.prepareStatement(sbSql.toString());

pstmt.setInt(1, pageNo * pageSize);

pstmt.setInt(2, (pageNo - 1) * pageSize);

rs = pstmt.executeQuery();

List<User> userList = new ArrayList<User>();

while (rs.next()) {

User user = new User();

user.setUserId(rs.getString("user_id"));

user.setUserName(rs.getString("user_name"));

user.setPassword(rs.getString("password"));

user.setContactTel(rs.getString("contact_tel"));

user.setEmail(rs.getString("email"));

user.setCreateDate(rs.getTimestamp("create_date"));

userList.add(user);

}

pageModel = new PageModel<User>();

pageModel.setList(userList);

pageModel.setTotalRecords(getTotalRecords(conn));

pageModel.setPageSize(pageSize);

pageModel.setPageNo(pageNo);

}catch(SQLException e) {

e.printStackTrace();

}finally {

DbUtil.close(rs);

DbUtil.close(pstmt);

DbUtil.close(conn);

}

return pageModel;

}

/**

* 取得总记录数

* @param conn

* @return

*/

private int getTotalRecords(Connection conn)

throws SQLException {

String sql = "select count(*) from t_user where user_id <> 'root'";

PreparedStatement pstmt = null;

ResultSet rs = null;

int count = 0;

try {

pstmt = conn.prepareStatement(sql);

rs = pstmt.executeQuery();

rs.next();

count = rs.getInt(1);

}finally {

DbUtil.close(rs);

DbUtil.close(pstmt);

}

return count;

}

}

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User.java

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package com.ceshi.entity;

import java.util.Date;

public class User {

private String userId; //用户ID

private String userName; //用户名称

private String password; //用户密码

private String contactTel; //用户电话

private String email; //电子邮件

private Date createDate; //创建日期

public String getUserId() {

return userId;

}

public void setUserId(String userId) {

this.userId = userId;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getContactTel() {

return contactTel == null ? "": contactTel;

}

public void setContactTel(String contactTel) {

this.contactTel = contactTel;

}

public String getEmail() {

return email == null ? "": email;

}

public void setEmail(String email) {

this.email = email;

}

public Date getCreateDate() {

return createDate;

}

public void setCreateDate(Date createDate) {

this.createDate = createDate;

}

}

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add_query.jsp

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<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>

<%@ page import="java.util.*" %>

<%@ page import="java.text.*" %>

<%@ page import="com.ceshi.manager.*"%>

<%@ page import="com.ceshi.util.*"%>

<%@ page import="com.ceshi.entity.*"%>

<%

request.setCharacterEncoding("GB18030");

String command = request.getParameter("command");

if ("del".equals(command)) {

String[] userIds = request.getParameterValues("selectFlag");

for (int i=0; i<userIds.length; i++) {

UserManager.getInstance().delUser(userIds[i]);

}

}

int pageNo = 1;

int pageSize = 4; //每页设置的大小

String pageNoString = request.getParameter("pageNo");

if (pageNoString != null) {

pageNo = Integer.parseInt(pageNoString);

}

PageModel<User> pageModel = UserManager.getInstance().findUserList(pageNo, pageSize);

%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030">

<title>用户维护</title>

<script type="text/javascript">

function addUser() {

//点添加按钮时 跳向user_add.jsp页面

window.self.location = "user_add.jsp";

}

function modifyUser() {

var selectFlags = document.getElementsByName("selectFlag");

var count = 0;

var j = 0;

for (var i=0; i<selectFlags.length; i++) {

if (selectFlags[i].checked) {

j = i;

count++;

}

}

if (count == 0) {

alert("请选择需要修改的用户！");

return;

}

if (count > 1) {

alert("一次只能修改一个用户！");

return;

}

window.self.location = "user_modify.jsp?userId=" + selectFlags[j].value;

}

function deleteUser() {

var selectFlags = document.getElementsByName("selectFlag");

var flag = false;

for (var i=0; i<selectFlags.length; i++) {

if (selectFlags[i].checked) {

flag = true;

break;

}

}

if (!flag) {

alert("请选择需要删除的用户！");

return;

}

if (window.confirm("确认删除吗？")) {

with (document.getElementById("userform")) {

action="user_main.jsp?command=del";

method="post";

submit();

}

}

}

function checkAll(field) {

var selectFlags = document.getElementsByName("selectFlag");

for (var i=0; i<selectFlags.length; i++) {

selectFlags[i].checked = field.checked;

}

}

function topPage() {

window.self.location = "user_main.jsp?pageNo=<%=pageModel.getTopPageNo()%>";

}

function previousPage() {

window.self.location = "user_main.jsp?pageNo=<%=pageModel.getPreviousPageNo()%>";

}

function nextPage() {

window.self.location = "user_main.jsp?pageNo=<%=pageModel.getNextPageNo()%>";

}

function bottomPage() {

window.self.location = "user_main.jsp?pageNo=<%=pageModel.getBottomPageNo()%>";

}

</script>

</head>

<body class="body1" bgcolor="#CCCCCC">

<br>

<form name="userform" id="userform">

<div align="center">用户维护界面</div><br>

<table width="800px" border="1" cellspacing="0" cellpadding="0" align="center" class="table1">

<tr>

<td width="55" class="rd6">

<input type="checkbox" name="ifAll" onClick="checkAll(this)">

</td>

<td width="119" class="rd6">

用户代码

</td>

<td width="152" class="rd6">

用户名称

</td>

<td width="166" class="rd6">

联系电话

</td>

<td width="150" class="rd6">

email

</td>

<td width="200" class="rd6">

创建日期

</td>

</tr>

<%

List<User> userList = pageModel.getList();

for (Iterator<User> iter=userList.iterator(); iter.hasNext();) {

User user = iter.next();

%>

<tr>

<td class="rd8">

<input type="checkbox" name="selectFlag" class="checkbox1"

value="<%=user.getUserId() %>">

</td>

<td class="rd8">

<%=user.getUserId() %>

</td>

<td class="rd8">

<%=user.getUserName() %>

</td>

<td class="rd8">

<%=user.getContactTel()%>

</td>

<td class="rd8">

<%=user.getEmail() %>

</td>

<td class="rd8">

<%=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(user.getCreateDate()) %>

</td>

</tr>

<%

}

%>

</table>

<table width="800px" height="30" border="0" align="center"

cellpadding="0" cellspacing="0" class="rd1">

<tr>

<td nowrap class="rd19" height="2">

<div align="left">

共 <font color="red"><%=pageModel.getTotalPages() %></font> 页    

当前第<font color="red"><%=pageModel.getPageNo() %></font>页

</div>

</td>

<td nowrap class="rd19">

<div align="right">

<input name="btnTopPage" class="button1" type="button" id="btnTopPage" value=" << " title="首页" onClick="topPage()">

<input name="btnPreviousPage" class="button1" type="button" id="btnPreviousPage" value=" < " title="上页" onClick="previousPage()">

<input name="btnNextPage" class="button1" type="button" id="btnNextPage" value=" > " title="下页" onClick="nextPage()">

<input name="btnBottomPage" class="button1" type="button" id="btnBottomPage" value=" >> " title="尾页" onClick="bottomPage()">

<input name="btnAdd" type="button" class="button1" id="btnAdd" value="添加" onClick="addUser()">

<input name="btnDelete" class="button1" type="button" id="btnDelete" value="删除" onClick="deleteUser()">

<input name="btnModify" class="button1" type="button" id="btnModify" value="修改" onClick="modifyUser()">

</div>

</td>

</tr>

</table>

</form>

</body>

</html>

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add_modify.jsp

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<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>

<%@ page import="com.ceshi.entity.*" %>

<%@ page import="com.ceshi.manager.*" %>

<%

request.setCharacterEncoding("GB18030");

String command = request.getParameter("command");

String userId = request.getParameter("userId");

User user = UserManager.getInstance().findUserById(userId);

if ("modify".equals(command)) {

user.setUserId(request.getParameter("userId"));

user.setUserName(request.getParameter("userName"));

user.setPassword(request.getParameter("password"));

user.setContactTel(request.getParameter("tel"));

user.setEmail(request.getParameter("email"));

UserManager.getInstance().modifyUser(user);

out.println("修改用户成功！");

}

%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030">

<title>修改用户</title>

<script type="text/javascript">

function modifyUser(){

with (document.getElementById("userForm")) {

method="post";

action="user_modify.jsp?command=modify";

submit();

}

}

function userMain() {

window.self.location = "user_main.jsp";

}

</script>

</head>

<body bgcolor="#CCCCCC" >

<form name="userForm" target="_self" id="userForm">

<input type="hidden" name="command" value="modify">

<br><div align="center">修改用户<br><br>

</div><table align="center" width="300" border="1">

<tr>

<td width="83" align="right">用户代码</td>

<td width="201">

<input type="text" name="userId" id="userId" value="<%=user.getUserId() %>"/>

</td>

</tr>

<tr>

<td align="right">用户名称</td>

<td>

<input type="text" name="userName" id="userName" value="<%=user.getUserName() %>"/>

</td>

</tr>

<tr>

<td align="right">密码</td>

<td>

<input type="password" name="password" id="password" value="<%=user.getPassword() %>"/>

</td>

</tr>

<tr>

<td align="right">联系电话</td>

<td>

<input type="tel" name="tel" id="tel" value="<%=user.getContactTel() %>"/>

</td>

</tr>

<tr>

<td align="right">E-mail</td>

<td>

<input type="email" name="email" id="email" value="<%=user.getEmail() %>"/>

</td>

</tr>

<tr>

<td>

<br>

</td>

<td align="center">

<input type="submit" name="button" id="button" value="修改" onclick="modifyUser()"/>

<input type="button" name="btnAdd" class="button1" id="btnAdd" value="返回" onclick="userMain()">

</td>

</tr>

</table>

</form>

</body>

</html>

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add_add.jsp

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<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>

<%@ page import="com.ceshi.entity.*" %>

<%@ page import="com.ceshi.manager.*" %>

<%

request.setCharacterEncoding("GB18030");

String command = request.getParameter("command");

String userId = "";

String userName = "";

String contactTel = "";

String email = "";

if("add".equals(command)){//会很好的防止空指针异常

if(UserManager.getInstance().findUserById(request.getParameter("userId")) == null)

{

User user = new User();

user.setUserId(request.getParameter("userId"));

user.setUserName(request.getParameter("userName"));

user.setPassword(request.getParameter("password"));

user.setContactTel(request.getParameter("tel"));

user.setEmail(request.getParameter("email"));

UserManager.getInstance().addUser(user);

out.println("添加用户成功！");

}else {

userId = request.getParameter("userId");

userName = request.getParameter("userName");

contactTel = request.getParameter("contactTel");

email = request.getParameter("email");

out.println("用户代码已经存在，代码=【" + request.getParameter("userId") + "】");

}

}

%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030">

<title>添加用户</title>

<script type="text/javascript">

function addUser(){

with (document.getElementById("userForm")) {

action="user_add.jsp";

method="post";

submit();

}

}

function userMain() {

window.self.location = "user_main.jsp";

}

</script>

</head>

<body bgcolor="#CCCCCC" >

<form name="userForm" target="_self" id="userForm">

<input type="hidden" name="command" value="add">

<br><div align="center">添加用户<br><br>

</div><table align="center" width="300" border="1">

<tr>

<td width="83" align="right">用户代码</td>

<td width="201">

<input type="text" name="userId" id="userId" />

<span id="spanUserId"></span>

</td>

</tr>

<tr>

<td align="right">用户名称</td>

<td>

<input type="text" name="userName" id="userName" />

</td>

</tr>

<tr>

<td align="right">密码</td>

<td>

<input type="password" name="password" id="password" />

</td>

</tr>

<tr>

<td align="right">联系电话</td>

<td>

<input type="tel" name="tel" id="tel" />

</td>

</tr>

<tr>

<td align="right">E-mail</td>

<td>

<input type="email" name="email" id="email" />

</td>

</tr>

<tr>

<td>

<br>

</td>

<td align="center">

<input type="submit" name="button" id="button" value="保存信息" onclick="addUser()"/>

<input type="button" name="btnAdd" class="button1" id="btnAdd" value="返回" onclick="userMain()">

</td>

</tr>

</table>

</form>

</body>

</html>

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no fy

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/**

* 取得用户列表

* @return

*/

public List<User> getUsers(){//如果不是static 我们取用户的时候可能要new 一个新的用户

String sql = "select * from t_user";

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

User user = null;

List<User> users = new ArrayList<User>();

try {

conn = DbUtil.getConnection();

pstmt = conn.prepareStatement(sql);

rs = pstmt.executeQuery();

while (rs.next()) {

user = new User();

user.setId(rs.getString("id"));

user.setName(rs.getString("name"));

user.setPassword(rs.getString("password"));

user.setTel(rs.getString("tel"));

user.setEmail(rs.getString("email"));

user.setCreateDate(rs.getTimestamp("create_date"));

users.add(user);

}

} catch (SQLException e) {

e.printStackTrace();

} finally {

DbUtil.close(rs);

DbUtil.close(pstmt);

DbUtil.close(conn);

}

return users;

}

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<%

List<User> users = UserManager.getInstance().getUsers();

for (int i = 0; i < users.size(); i++) {

User user = users.get(i);

%>

<tr>

<td class="rd8">

<input type="checkbox" name="selectFlag" class="checkbox1" value="<%=user.getId()%>">

</td>

<td class="rd8">

<%=user.getName() %>

</td>

<td class="rd8">

<%=user.getPassword() %>

</td>

<td class="rd8">

<%=user.getTel()%>

</td>

<td class="rd8">

<%=user.getEmail() %>

</td>

<td class="rd8">

<%=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(user.getCreateDate()) %>

</td>

</tr>

<%

}

%>

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Junit.java

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package com.ceshi.manager;

import java.util.List;

import java.util.Scanner;

import junit.framework.TestCase;

import com.ceshi.entity.User;

public class TestUserManager extends TestCase{

//测试删除操作

public void testDelUser(){

Scanner str = new Scanner(System.in);

System.out.print("请输入要删除的用户Id:");

String userId = str.next();

UserManager.getInstance().delUser(userId);

}

//测试查询操作

public void testGetUsers(){

List<User> users = UserManager.getInstance().getUsers();

for (int i = 0; i < users.size(); i++) {

User user = users.get(i);

System.out.print(user.getName());//获取名字

}

}

//测试用户添加

public void testAddUser(){

User user = new User();

Scanner str = new Scanner(System.in);

System.out.print("请输入用户Id:");

String id = str.next();

System.out.print("请输入用户name:");

String name = str.next();

System.out.print("请输入用户password:");

String password = str.next();

System.out.print("请输入用户tel:");

String tel = str.next();

System.out.print("请输入用户email:");

String email = str.next();

user.setId(id);

user.setName(name);

user.setPassword(password);

user.setTel(tel);

user.setEmail(email);

UserManager.getInstance().addUser(user);

}

//根据用户Id查询

public void testFindUserById(){

Scanner str = new Scanner(System.in);

System.out.print("请输入用户Id:");

String userId = str.next();

UserManager.getInstance().findUserById(userId);

User user = new User();

System.out.print("用户的名字:"+user.getName());

}

}

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