JavaWeb开发的Hadoop网盘（3）
文章目录
- 一、dao层
- 1、封装增删改查（BaseDao ）
- 2、登陆注册的接口（UserDao ）
- 3、登陆注册接口的实现类（UserDaoImpl ，需要继承BaseDao类、实现UserDao接口）
- 二、HDFS类
- 三、实体类（User ）
- 四、连接数据库jdbc（JdbcUtil ）
- 五、登陆注册页面（login.jsp）
- 六、显示文件页面（index.jsp）
一、dao层
1、封装增删改查（BaseDao ）
package dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.rowset.CachedRowSet;
import com.sun.rowset.CachedRowSetImpl;
import util.JdbcUtil;
//封装所有的crud
public class BaseDao {
//封装增删改 pst.executeUpdate
public void modify (String sql,Object...objects) {
//获得connection对象
Connection con=null;
try {
con= JdbcUtil.getCon();
//创建预编译对象,且预先执行sql语句
PreparedStatement pst = con.prepareStatement(sql);
for (int i = 0; i < objects.length; i++) {
pst.setObject(i+1, objects[i]);
}
//提交
pst.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
//关闭资源
JdbcUtil.closeCon(con);
}
}
//封装查询
//返回的是缓存的结果集
public CachedRowSet search(String sql,Object...objects) {
//获得connection对象
Connection con=null;
try {
con= JdbcUtil.getCon();
//创建预编译对象,且预先执行sql语句
PreparedStatement pst = con.prepareStatement(sql);
for (int i = 0; i < objects.length; i++) {
pst.setObject(i+1, objects[i]);
}
//提交并返回结果集
ResultSet rs = pst.executeQuery();
//创建缓存的结果集
CachedRowSet crs= new CachedRowSetImpl();
//将结果集放入到缓存的结果集中
crs.populate(rs);
//返回
return crs;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
//关闭资源
JdbcUtil.closeCon(con);
}
return null;
}
}
2、登陆注册的接口（UserDao ）
package dao;
import pojo.User;
public interface UserDao {
//注册
void addUser(User user);
//登陆
User login(String username,String userpwd);
//查找用户名
User findUserName(String username);
}
3、登陆注册接口的实现类（UserDaoImpl ，需要继承BaseDao类、实现UserDao接口）
package dao.impl;
import java.sql.SQLException;
import javax.sql.rowset.CachedRowSet;
import dao.BaseDao;
import dao.UserDao;
import pojo.User;
public class UserDaoImpl extends BaseDao implements UserDao {
@Override
public void addUser(User user) {
String sql="insert into user(username,userpwd) values "+"(?,?)";
modify(sql, user.getUsername(),user.getUserpwd());
}
@Override
public User login(String username, String userpwd) {
String sql="select * from user where username=? and userpwd=?";
CachedRowSet result=this.search(sql, username,userpwd);
User user=null;
try {
if (result.next()) {
user=new User();
user.setUserid(result.getInt("userid"));
user.setUsername(result.getString("username"));
user.setUserpwd(result.getString("userpwd"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return user;
}
@Override
public User findUserName(String username) {
String sql="select * from user where username=?";
// TODO Auto-generated method stub
CachedRowSet result=this.search(sql, username);
User user=null;
try {
if (result.next()) {
user=new User();
user.setUserid(result.getInt("userid"));
user.setUsername(result.getString("username"));
user.setUserpwd("null");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return user;
}
}
二、HDFS类
通过servlet来调用该类，实现HDFS中的上传、下载、删除文件等方法。
package hdfs;
import java.io.*;
import java.net.URI;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class HdfsOper {
static Configuration conf = new Configuration();
public static void init() throws IOException {
conf.set("fs.defaultFS","hdfs://localhost:9000");
conf.set("fs.hdfs.impl","org.apache.hadoop.hdfs.DistributedFileSystem");
}
//在用户目录下创建目录
public static void CrDir(String PATH,String dir) throws IOException {
init();
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
String file1=PATH+"/"+dir+"/";
Path a=new Path(file1);
fs.mkdirs(a);
fs.close();
}
//为每个用户创建一个目录
public static void mk(String username) throws IOException{
init();
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
String upremote="/"+username;
Path a = new Path(upremote);
fs.mkdirs(a);
fs.close();
}
//上传文件
public static void copyFile(String fileName,InputStream in) throws IOException{
init();
//String filePath="/"+fileName;
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
FSDataOutputStream out=fs.create(new Path(fileName));
IOUtils.copy(in,out);
fs.close();
}
//遍历用户根目录下的文件与目录
public static FileStatus[] ShowFiles(String username) throws IOException{
init();
String filePath="/"+username+"/";
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
FileStatus[] list=fs.listStatus(new Path(filePath));
if (list!=null) {
for (FileStatus f:list) {
//System.out.printf("name %s,folder:%s,size:%d\n",f.getPath(),f.isDir(),f.getLen());
}
}
fs.close();
return list;
}
//遍历用户目录下的文件夹下面的文件
public static FileStatus[] ShowDirFiles(String filePath) throws IOException{
init();
//String filePath1="/"+username+"/"+filePath+"/";
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
FileStatus[] list=fs.listStatus(new Path(filePath));
if (list!=null) {
for (FileStatus f:list) {
//System.out.printf("name %s,folder:%s,size:%d\n",f.getPath(),f.isDir(),f.getLen());
}
}
fs.close();
return list;
}
//下载文件夹
public static void DownloadFile(String DirPath,String oldPath) throws IOException {
//String oldPath="/user/hadoop/myLocalFile.txt";
init();
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
//String name="myLocalFile.txt";
String newPath="/home/hadoop/桌面";
String oldPath1="/"+DirPath+"/"+oldPath;
fs.copyToLocalFile(false, new Path(oldPath1),new Path(newPath),true);
//Path ofile = new Path(oldPath);
fs.close();
}
//通过流下载文件
public static InputStream down(String filePath) throws IOException {
init();
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
String filePath1="/"+filePath+"/";
FSDataInputStream in=fs.open(new Path(filePath1));
return in;
}
//删除文件
public static void DeleteFile(String DirPath,String deletePath) throws IOException {
init();
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
String deletePath1="/"+DirPath+"/"+deletePath;
fs.deleteOnExit(new Path(deletePath1));
fs.close();
}
//移动
public static void ReName(String path1,String path2) throws IOException {
// 1获取对象
init();
String filePath1 =path1 + "/";
String filePath2 =path2 + "/";
FileSystem fs = FileSystem.get(URI.create("hdfs://localhost:9000"),conf);
boolean re = fs.rename(new Path(filePath1), new Path(filePath2));
System.out.println("rename:"+re);
}
}
三、实体类（User ）
package pojo;
public class User {
private int userid;
private String username;
private String userpwd;
public User() {
}
public User(int userid, String username, String userpwd) {
super();
this.userid = userid;
this.username = username;
this.userpwd = userpwd;
}
@Override
public String toString() {
return "User [userid=" + userid + ", username=" + username + ", userpwd=" + userpwd + "]";
}
public int getUserid() {
return userid;
}
public void setUserid(int userid) {
this.userid = userid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserpwd() {
return userpwd;
}
public void setUserpwd(String userpwd) {
this.userpwd = userpwd;
}
}
四、连接数据库jdbc（JdbcUtil ）
package util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JdbcUtil {
private static String url="jdbc:mysql://localhost:3306/sys?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8";
private static String username="debian-sys-maint";
private static String password="Y3SWr5aeHtXxZ9QI";
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static Connection getCon() throws SQLException{
return (Connection) DriverManager.getConnection(url, username, password);
}
public static void closeCon(Connection con) {
try {
if (con!=null)
{
con.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
五、登陆注册页面（login.jsp）
登陆注册是一个页面。代码里面引用了外部的js
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>Hadoop网盘</title>
<script src="https://use.fontawesome.com/b729cab93f.js"></script>
<link rel="icon" href="http://img3.imgtn.bdimg.com/it/u=1870932651,3659050372&fm=26&gp=0.jpg" type="image/x-icon">
<!-- <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.8.2/css/all.min.css"> -->
<link rel="stylesheet" href="css/style.css">
</head>
<body style="background: url(img/test1.jpg)">
<div class="dowebok" id="dowebok">
<div class="form-container sign-up-container">
<form action="register.do" method="post">
<h1>注册</h1>
<div class="social-container">
<a href="#" class="social"><i class="fa fa-qq"></i></a>
<a href="#" class="social"><i class="fa fa-link"></i></a>
<a href="#" class="social"><i class="fa fa-twitter"></i></a>
</div>
<input type="text" placeholder="用户名" name="username">
<input type="password" placeholder="密码" name="userpwd">
<input type="password" placeholder="确认密码" name="userpwd1">
<button type="submit">注册</button>
<br/>
<span style="color: red">${message}</span>
</form>
</div>
<div class="form-container sign-in-container">
<form action="login.do" method="post">
<h1>登录</h1>
<div class="social-container">
<a href="#" class="social"><i class="fa fa-qq"></i></a>
<a href="#" class="social"><i class="fa fa-link"></i></a>
<a href="#" class="social"><i class="fa fa-twitter"></i></a>
</div>
<span>使用您的帐号</span>
<input type="text" placeholder="用户名" name="username">
<input type="password" placeholder="密码" name="userpwd">
<a href="#">忘记密码？</a>
<button type="submit">登录</button>
</form>
</div>
<div class="overlay-container">
<div class="overlay">
<div class="overlay-panel overlay-left">
<h1>已有帐号？</h1>
<p>请使用您的帐号进行登录</p>
<button class="ghost" id="signIn">登录</button>
</div>
<div class="overlay-panel overlay-right">
<h1>没有帐号？</h1>
<p>立即注册加入我们，和我们一起开始旅程吧</p>
<button class="ghost" id="signUp">注册</button>
</div>
</div>
</div>
</div>
<script src="js/index.js"></script>
</body>
</html>
六、显示文件页面（index.jsp）
<%@page import="java.io.File"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="org.apache.hadoop.fs.FileStatus"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>欢迎使用-Hadoop网盘</title>
<!-- 新 Bootstrap4 核心 CSS 文件 -->
<link rel="stylesheet"
href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<link rel="icon"
href="http://img3.imgtn.bdimg.com/it/u=1870932651,3659050372&fm=26&gp=0.jpg"
type="image/x-icon">
<link href="https://cdn.bootcdn.net/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
</head>
<body class="container" >
<%
FileStatus[] list = (FileStatus[]) request.getAttribute("list");
String name = (String) session.getAttribute("username");
String result;
if (list.length != 0) {
result = list[0].getPath().getParent().toString().substring(22);
}else{
result = name;
}
//
%>
<%
String PATH=(String)request.getAttribute("filePath");
if (PATH==null){
PATH="/"+name;
}
File file=new File(PATH);
String PATH1=file.getParent();
if (PATH1==null){
PATH1="/"+name;
}
//request.setAttribute("PATH", PATH);
%>
<nav class="navbar navbar-expand-lg navbar-light bg-light mt-5">
<a class="navbar-brand" href="#">Hadoop网盘</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a> <input class="form-control mr-sm-2 col-5" type="text" id="myInput" onkeyup="myFunction()" placeholder="搜索..."> </a>
<a class="nav-link col-3">当前路径：<%=PATH %></a>
<form class="form-inline my-2 my-lg-0" action="UserCreDicServlet?PATH=<%=PATH %>" method="post" >
<input class="form-control mr-sm-2 col-5" type="text"
placeholder="输入文件夹名称" name="mkdir">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">创建</button>
</form>
<form action="UserCopyServlet?PATH=<%=PATH %>" method="post" enctype="multipart/form-data">
<div class="row">
<div class="col-8">
<input type="file"
class="filestyle" data-badgeName="badge-danger" data-badge="true" data-placeholder="未选择文件"
data-text="点击上传文件" name="file1">
</div>
<div class="col-3 ml-0 pl-0">
<button
class="btn btn-secondary my-2 my-sm-0" type="submit" >提交</button>
</div>
</div>
</form>
</nav>
<table id="myTable" class="table table-hover " style="text-align: center">
<thead class="thead-dark">
<tr>
<th scope="col">序号</th>
<th scope="col">文件名</th>
<th scope="col">属性</th>
<th scope="col">大小</th>
<th scope="col">可执行操作</th>
</tr>
</thead>
<%String cut=(String) request.getAttribute("cut"); %>
<tbody>
<%
if (list != null) {
for (int i = 0; i < list.length; i++) {
%>
<tr>
<%
out.print("" + (i + 1) + " ");
if (list[i].isDir())//DocumentServlet
{
out.print("+"/"+result+"/"+list[i].getPath().getName()+"&&cut="+cut+"\">"+list[i].getPath().getName()+"> ");
} else {
out.print(""+list[i].getPath().getName()+" ");
}
%>
<td><%=(list[i].isDir() ? "目录" : "文件")%></td>
<td><%=(list[i].getLen())%></td>
<td><a role='button' class='btn btn-outline-success' aria-pressed='true' href="/Test-BigData/UserDownServlet?oldPath=<%=(list[i].getPath().getName()) %>&&name=<%=name %>&&result=<%=result %>&&isDir=<%=list[i].isDir() %>" class="btn btn-primary"><i class='fa fa-sign-in mr-1' aria-hidden='true'></i>下载</a>;
<a role="button" class="btn btn-outline-danger"
aria-pressed="true"
href="javascript: if(window.confirm('是否删除？')){window.location.href='/Test-BigData/UserDeleteServlet?deletePath=<%= (list[i].getPath().getName()) %>&&name=<%=name %>&&result=<%=result %>'}">删除</a>
<%
if (cut == null||cut.equals("null")) {
out.print(" ");
} else if (!cut.equals("null")&&cut != null && list[i].isDir()) {
out.print("粘贴");
}
%>
</td>
<tr>
<%
}
}
if (list.length == 0) {
out.print("没有任何文件哦 ");
}
%>
</table>
<div class="row">
<div class="col-3 offset-9">
<div class="row">
<a role="button" class="btn btn-outline-secondary col-6 mr-1" href="/Test-BigData/DirShowFilesServlet?filePath=<%=PATH1 %>&&name=<%=name %>" class="btn btn-danger"><i class="fa fa-arrow-left" aria-hidden="true"></i>返回上一级</a>
<a class="btn btn-danger col-4" href="javascript: if(window.confirm('是否注销？')){window.location.href='login.jsp'}" role="button">注销登录</a>
</div>
</div>
</div>
</body>
<footer>
<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
<!-- 搜索功能js -->
<script>
function myFunction() {
// 声明变量
var input, filter, table, tr, td, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
table = document.getElementById("myTable");
tr = table.getElementsByTagName("tr");
// 循环表格每一行，查找匹配项
for (i = 0; i < tr.length; i++) {
td = tr[i].getElementsByTagName("td")[0];
if (td) {
if (td.innerHTML.toUpperCase().indexOf(filter) > -1) {
tr[i].style.display = "";
} else {
tr[i].style.display = "none";
}
}
}
}
</script>
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script
src="https://cdn.bootcdn.net/ajax/libs/bootstrap-filestyle/2.1.0/bootstrap-filestyle.js"></script>
<!-- bootstrap.bundle.min.js 用于弹窗、提示、下拉菜单，包含了 popper.min.js -->
<script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
<script
src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script type="text/javascript">
// get
$(":file").filestyle({
'onChange': function (files) {
console.log(files)
}
}
$(":file").filestyle({text: "Find file"});
</script>
</script>
<script type="text/javascript" color="100,50,100" opacity='1' zIndex="-2" count="99" src="//cdn.bootcss.com/canvas-nest.js/1.0.1/canvas-nest.min.js"></script>
</footer>
</html>