动手写一个java版简单云相册,实现的功能是：
用户可以一次上传一个至多个文件。
用户可以下载其他人上传的图片。
用户可以查看其他所有人的图片。
用户只能删除通过自己IP上传的图片。
用到的技术：
文件上传下载、设计模式、Dom4j、xPath等。
先看下2个页面：
源代码：
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <servlet> <servlet-name>UploadServlet</servlet-name> <servlet-class>cn.hncu.servlets.UploadServlet</servlet-class> </servlet> <servlet> <servlet-name>cloudPhotoServlet</servlet-name> <servlet-class>cn.hncu.servlets.cloudPhotoServlet</servlet-class> </servlet> <servlet> <servlet-name>DownServlet</servlet-name> <servlet-class>cn.hncu.servlets.DownServlet</servlet-class> </servlet> <servlet> <servlet-name>DelServlet</servlet-name> <servlet-class>cn.hncu.servlets.DelServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>UploadServlet</servlet-name> <url-pattern>/upload</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>cloudPhotoServlet</servlet-name> <url-pattern>/cloudPhoto</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>DownServlet</servlet-name> <url-pattern>/servlet/DownServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>DelServlet</servlet-name> <url-pattern>/servlet/DelServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>chx云相册</title>
<script type="text/javascript">
function delFile(input){
table = input.parentElement.parentElement.parentElement;//table.nodeName TBODY
table.removeChild(input.parentElement.parentElement);
}
var t=1;
function addFile(input){
tr = input.parentElement.parentElement;
//alert(tr.nodeName);
var str = "<td>选择文件：</td>"+
"<td> <input type='file' name='file"+t+"'> </td> "+
"<td>文件说明：</td>"+
"<td> <input type='text' name='text"+t+"'> </td> "+
"<td> <input type='button' value='删除文件' onclick='delFile(this)'> </td>";
tr.insertAdjacentHTML("beforeBegin",str);
}
function move(){
window.location.href="/myPhoto/cloudPhoto";
}
</script>
<style type="text/css">
#font{
color:red;
}
</style>
</head>
<body>
<h1><font id="font">相册上传：</font></h1>
<form action="/myPhoto/upload" method="post" enctype="multipart/form-data">
<table border="1px;double;#ff0000">
<tr>
<td>选择文件：</td>
<td> <input type="file" name="file1"> </td>
<td>文件说明：</td>
<td> <input type="text" name="text1"> </td>
<td> <input type="button" value="删 除 文 件" onclick="delFile(this)"> </td>
</tr>
<tr>
<td colspan=2> <input type="submit" value="上 传 文 件"> </td>
<td colspan=3> <input type="button" value="添 加 文 件" onclick="addFile(this)"> </td>
</tr>
</table>
</form>
<form action="/myPhoto/cloudPhoto" method="post" enctype="multipart/form-data">
<table border="1px;double;#ff0000">
<tr>
<td colspan=5><input type="submit" value="进 入 云 相 册" onclick="move()"></td>
</tr>
</table>
</form>
</body>
</html>
photo.xml:
<?xml version="1.0" encoding="UTF-8"?> <photos> </photos>
MyUtils.java:
package cn.hncu.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
public class MyUtils {
/**
* @return 获取UUID
*/
public static String getUUID(){
return UUID.randomUUID().toString().replace("-", "");
}
/**
* @param uuid
* @return 通过uuid，获得打散后的路径
*/
public static String getDir(String uuid){
String dir1 = Integer.toHexString( uuid.hashCode() & 0xf );
String dir2 = Integer.toHexString( (uuid.hashCode() & 0xf0)>>4 );
return "/"+dir1+"/"+dir2;
}
//日期时间格式
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
/**
* @return 返回的是上传的时候的日期时间
*/
public static String getCurrentDateTime(){
return sdf.format(new Date());
}
}
Dom4jFactory.java:
package cn.hncu.utils;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class Dom4jFactory {
private static Document dom=null;
private static String path;
//静态块！只会运行一次！特点是在类加载的时候就执行
static{
try {
SAXReader sax = new SAXReader();
//因为我们的资源已经从myelipse中发布到tomcat服务器中了，所以跟原来的纯Java项目不一样了。
//利用当前类找到它的类加载器，然后通过该类加载器再去获得资源路径
path = Dom4jFactory.class.getClassLoader().getResource("photo.xml").getPath();
//getClassLoader()返回：加载此对象所表示的类或接口的类加载器
//public URL getResource(String name)返回：读取资源的 URL 对象；如果找不到该资源，或者调用者没有足够的权限获取该资源，则返回 null。
//此方法首先搜索资源的父类加载器；如果父类加载器为 null，则搜索的路径就是虚拟机的内置类加载器的路径。
//public String getPath()获取此 URL 的路径部分。
System.out.println(path);
dom = sax.read(new FileInputStream(path));
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
} catch (DocumentException e) {
throw new RuntimeException(e);
}
}
/**
* @return 获取相册的Document
*/
public static Document getDocument(){
return dom;
}
/**
* 进行photo.xml的保存，保存到本地
*/
public static boolean save(){
try {
XMLWriter w = new XMLWriter(new FileOutputStream(path));
w.write(dom);
w.close();
return true;
} catch (UnsupportedEncodingException e) {
return false;
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
return false;
}
}
public static boolean del(String uuid){
Node node = dom.selectSingleNode("[@uuid='"+uuid+"']");
if(node==null){
return false;
}
node.getParent().remove(node);
return true;
}
/**
* 测试用
* @param args
*/
public static void main(String[] args){
System.out.println( getDocument() );
}
}
PhotoModel.java-值对象
package cn.hncu.domain;
/**
* 值对象封装
* @author 陈浩翔
* 2016-7-24
*/
public class PhotoModel {
private String uuid;//uuid
private String realName="";//图片真实文件名(上传时的文件名)
private String ext;//后缀名
private String dir;//打散后的路径
private String dateTime;//上传文件的时间
private String ip;//上传者的IP
private String desc;//文件的说明
public String getUuid() {
return uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
public String getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
public String getExt() {
return ext;
}
public void setExt(String ext) {
this.ext = ext;
}
public String getDir() {
return dir;
}
public void setDir(String dir) {
this.dir = dir;
}
public String getDateTime() {
return dateTime;
}
public void setDateTime(String dateTime) {
this.dateTime = dateTime;
}
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "PhotoModel [uuid=" + uuid + ", realName=" + realName + ", ext="
+ ext + ", dir=" + dir + ", dateTime=" + dateTime + ", ip="
+ ip + ", desc=" + desc + "]";
}
}
PhotoDao.java:
package cn.hncu.photoDao.Dao;
import java.util.List;
import cn.hncu.domain.PhotoModel;
public interface PhotoDao {
/**
* @param photo
* @return 数据的保存
*/
public boolean save(PhotoModel photo);
/**
* @return 返回所所有的图片信息
*/
public List<PhotoModel> getAll();
/**
* @param uuid
* @return 通过uuid 查找那个被封装的值对象
*/
public PhotoModel getSingleByUuid(String uuid);
/**
* @param uuid
* @return 通过uuid删除photos.xml中该图片的信息
*/
public boolean deleteXml(String uuid);
/**
* @param dir
* @return 通过路径删除服务器磁盘中该图片的信息
*/
public boolean deleteFile(String pathFileName);
}
PhotoSerImpl.java:
package cn.hncu.photoDao.impl;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import cn.hncu.domain.PhotoModel;
import cn.hncu.photoDao.Dao.PhotoDao;
import cn.hncu.utils.Dom4jFactory;
public class PhotoSerImpl implements PhotoDao{
@Override
public boolean save(PhotoModel photo) {
Document dom = Dom4jFactory.getDocument();
Element root = dom.getRootElement();
//添加属性
Element p = root.addElement("photo");
p.addAttribute("uuid", photo.getUuid());
p.addAttribute("realName", photo.getRealName());
p.addAttribute("dateTime", photo.getDateTime());
p.addAttribute("ip", photo.getIp());
p.addAttribute("ext", photo.getExt());
p.addAttribute("dir", photo.getDir());
p.addAttribute("desc", photo.getDesc());
return Dom4jFactory.save();
}
@Override
public List<PhotoModel> getAll() {
List<PhotoModel> list = new ArrayList<PhotoModel>();
Document dom = Dom4jFactory.getDocument();
Element root = dom.getRootElement();
Iterator<Element> it = root.elementIterator("photo");
//通过DOM4J获得photo元素的迭代器,也可以通过xPath来找到所有的 photo
//List<Node> lists = dom.selectNodes("//photo[@uuid]");
//Iterator<Node> it = lists.iterator();
while(it.hasNext()){
Element e = it.next();
PhotoModel photo = new PhotoModel();
photo.setUuid(e.attributeValue("uuid"));
photo.setRealName(e.attributeValue("realName"));
photo.setDateTime(e.attributeValue("dateTime"));
photo.setExt(e.attributeValue("ext"));
photo.setIp(e.attributeValue("ip"));
photo.setDir(e.attributeValue("dir"));
photo.setDesc(e.attributeValue("desc"));
list.add(photo);
}
return list;
}
@Override
public PhotoModel getSingleByUuid(String uuid) {
List<PhotoModel> photos=getAll();
for(PhotoModel photo:photos){
if(photo.getUuid().equals(uuid)){
return photo;
}
}
return null;
}
@Override
public boolean deleteXml(String uuid) {
Document dom = Dom4jFactory.getDocument();
Element e = (Element) dom.selectSingleNode("//photo[@uuid='"+uuid.trim()+"']");
return e.getParent().remove(e);
}
@Override
public boolean deleteFile(String pathFileName) {
try {
File file = new File(pathFileName);
if(file.exists()){
file.delete();
}
return true;
} catch (Exception e) {
return false;
}
}
}
PhotoDaoFactory.java:
package cn.hncu.photoDao.factory;
import cn.hncu.photoDao.impl.PhotoSerImpl;
/**
* 工厂方法
* @author 陈浩翔
* 2016-7-24
*/
public class PhotoDaoFactory {
public static PhotoSerImpl getPhotoDao(){
return new PhotoSerImpl();
}
}
上传-UploadServlet.java:
package cn.hncu.servlets;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import cn.hncu.domain.PhotoModel;
import cn.hncu.photoDao.Dao.PhotoDao;
import cn.hncu.photoDao.factory.PhotoDaoFactory;
import cn.hncu.utils.Dom4jFactory;
import cn.hncu.utils.MyUtils;
public class UploadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
response.getWriter().print("<h1>很抱歉，本页面不支持GET方式访问！！！</h1>");
response.getWriter().print("<a href='javascript:history.go(-1)'>返回上一页</a> ");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
final PrintWriter out = response.getWriter();
//防黑-非multipart表单提交
//使用上传工具的方式
boolean boo = ServletFileUpload.isMultipartContent(request);
if(!boo){
out.print("<h1>不支持普通表单的提交方式！</h1>");
return;
}
File file = new File("d:/photoCache");
if(!file.exists()){
file.mkdir();
}
DiskFileItemFactory fiFactory = new DiskFileItemFactory(1024*10,file);
ServletFileUpload upload = new ServletFileUpload(fiFactory);
upload.setHeaderEncoding("utf-8");//设置文件名编码
String path = getServletContext().getRealPath("/photos");
FileItem fi = null;
try {
List<FileItem> list = upload.parseRequest(request);
PhotoModel photo = new PhotoModel();//数据封装---需要7个属性
photo.setRealName("");
int cont=0;
for(FileItem f:list){
if(cont!=0 && cont%2==0 && !photo.getRealName().equals("")){
photo = new PhotoModel();//重新数据封装
}
fi=f;
if(fi.isFormField()){//普通表单组件
//得到文件说明
String desc = fi.getString("utf-8");
photo.setDesc(desc);//#1
}else{
//防黑3-如果在file组件中不选择文件
if(fi.getSize()==0){
photo.setRealName("");
cont++;
continue;
}
String fileName = fi.getName();
fileName = fileName.substring( fileName.lastIndexOf("\\")+1);//真实文件名
photo.setRealName(fileName);//#2
String ext = fileName.substring(fileName.lastIndexOf("."));//扩展名
photo.setExt(ext);//#3
photo.setDateTime(MyUtils.getCurrentDateTime());//#4
photo.setIp( request.getRemoteAddr() );//#5
String uuid = MyUtils.getUUID();
photo.setUuid(uuid);//#6
photo.setDir( MyUtils.getDir(uuid) );//#7
//打散目录
File dFile = new File(path+photo.getDir());
if(!dFile.exists()){
dFile.mkdirs();
}
fi.write(new File(path+photo.getDir()+"/"+photo.getUuid()+photo.getExt()));
}
cont++;
if(cont%2==0 && !photo.getRealName().equals("")){
PhotoDao dao = PhotoDaoFactory.getPhotoDao();
boo = dao.save(photo);
//存入磁盘-法二：FileUtils.copyInputStreamToFile(in, new File(fileName2));//※2※ 把图片文件存储到服务器硬盘
photo = new PhotoModel();//重新数据封装
}
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}finally{
if(fi!=null){
fi.delete();
}
if(Dom4jFactory.save()){
out.print("<h1>上传成功！</h1>");
out.print("<a href='javascript:history.go(-1)'>返回上一页</a> ");
}else{
out.print("<h1>上传失败！</h1>");
out.print("<a href='javascript:history.go(-1)'>返回上一页</a> ");
}
}
}
}
显示所有文件-cloudPhotoServlet.java
package cn.hncu.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.domain.PhotoModel;
import cn.hncu.photoDao.Dao.PhotoDao;
import cn.hncu.photoDao.factory.PhotoDaoFactory;
public class cloudPhotoServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String pwd = (String) request.getParameter("pwd");
if ("chx".equals(pwd)) {
doPost(request, response);
} else {
response.setContentType("text/html;charset=utf-8");
response.getWriter().print("<h1>很抱歉，你没有权限访问！！！</h1>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>CHX云相册</TITLE></HEAD>");
out.println(" <BODY>");
out.println("<table border='1px;double;#ff0000'>");
out.println("<tr>");
out.println("<td>文件名</td>");
out.println("<td>上传时间");
out.println("<td>文件</td>");
out.println("<td>文件说明</td>");
out.println("<td>操作</td> ");
out.println("</tr>");
String tdWH = "style='width:200px; height:200px;'";
// 显示所有图片
PhotoDao dao = PhotoDaoFactory.getPhotoDao();
List<PhotoModel> photos = dao.getAll();
for (PhotoModel photo : photos) {
String fileName = photo.getRealName();
String time = photo.getDateTime();
// 输出图片
String path = request.getContextPath() + "/photos/"
+ photo.getDir() + "/" + photo.getUuid() + photo.getExt();
// System.out.println(path);
// /myPhoto/photos//7/c/a1237a48a6aa451cb22fa78b15bafcea.jpg
String img = "<a href='" + path + "'><img src='" + path + "'/></a>";
String desc = photo.getDesc();
String delStr = "<a href='/myPhoto/servlet/DelServlet?uuid="
+ photo.getUuid() + "'>删除</a>";
String downStr = "<a href='/myPhoto/servlet/DownServlet?uuid="
+ photo.getUuid() + "'>下载</a>";
out.println("<tr>");
out.println("<td " + tdWH + "> " + fileName + " </td>");
out.println("<td " + tdWH + ">" + time + "</td>");
out.println("<td " + tdWH + ">" + img + "</td>");
out.println("<td " + tdWH + ">" + desc + "</td>");
out.println("<td " + tdWH + ">" + delStr + " " + downStr
+ "</td>");
out.println("</tr>");
}
out.println("<tr>");
out.println("</tr>");
out.println("</table>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
删除文件-DelServlet.java
package cn.hncu.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.domain.PhotoModel;
import cn.hncu.photoDao.Dao.PhotoDao;
import cn.hncu.photoDao.factory.PhotoDaoFactory;
public class DelServlet extends HttpServlet {
//注入
private PhotoDao dao = PhotoDaoFactory.getPhotoDao();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String uuid = request.getParameter("uuid");
String ip = request.getRemoteAddr();
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
PhotoModel photo = dao.getSingleByUuid(uuid);
if(photo!=null){
if(!photo.getIp().equals(ip)){
out.print("<h1>你没有权限删除这个文件！！！</h1>");
out.print("<a href='javascript:history.go(-1)'>返回上一页</a> ");
return ;
}
//1.删除数据库中的信息
boolean boo = dao.deleteXml(uuid);
if(boo){
String fileName = "photos/"+photo.getDir()+"/"+photo.getUuid()+photo.getExt();
String pathFileName = getServletContext().getRealPath(fileName);
if(dao.deleteFile(pathFileName)){
//重定向到相册页面
response.sendRedirect("/myPhoto/cloudPhoto?pwd=chx");
}else{
out.print("<h1>无法从服务器中删除，文件正在被占用！！！</h1>");
out.print("<a href='javascript:history.go(-1)'>返回上一页</a> ");
}
}else{
out.print("<h1>该文件已经不存在！！！</h1>");
out.print("<a href='javascript:history.go(-1)'>返回上一页</a> ");
}
}
}
}
下载文件-DownServlet.java
package cn.hncu.servlets;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.domain.PhotoModel;
import cn.hncu.photoDao.Dao.PhotoDao;
import cn.hncu.photoDao.factory.PhotoDaoFactory;
public class DownServlet extends HttpServlet {
private PhotoDao dao = PhotoDaoFactory.getPhotoDao();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String uuid = request.getParameter("uuid");
System.out.println(uuid);
PhotoModel photo = dao.getSingleByUuid(uuid);
System.out.println(photo);
if(photo!=null){
//设置响应头--内容接收程序--浏览器看到这个响应头，就会把它认为的下载程序打开
//(如果识别迅雷那么就会自动打开迅雷，如果没有则会打开一个“文件另存为”的对话框)
response.setContentType("application/force-download");
String realName = photo.getRealName();
String agent = request.getHeader("User-Agent");
System.out.println(agent);
if(agent.indexOf("Mozilla")!=-1){//火狐浏览器
response.setHeader("Content-Disposition", "attachment;filename="+ new String(realName.getBytes("GB2312"),"ISO-8859-1"));
}else{
//解决中文乱码问题（只要用下面一句对文件名进行编码就行了）
realName = URLEncoder.encode(realName, "utf-8");//使用指定的编码机制将字符串转换为 application/x-www-form-urlencoded 格式。
response.setHeader("Content-Disposition", "attachment;filename=\""+realName+"\"");
//注意：“cttachment;”不能少，否则浏览器会直接在新窗口中打开
}
String fileName = "photos/" + photo.getDir()+"/"+photo.getUuid()+photo.getExt();
String pathFileName = getServletContext().getRealPath(fileName);
InputStream in = new FileInputStream(pathFileName);
OutputStream out = response.getOutputStream();
byte buf[] = new byte[2048];
int len=0;
while( (len=in.read(buf))!=-1 ){
out.write(buf, 0, len);
}
out.close();
in.close();
}else{
response.setContentType("text/html;charset=utf-8");
response.getWriter().println("<h1>该文件已经被删除了</h1>");
}
}
}
演示结果
这个我就不演示啦，图片在前面也有，所有的源码我都给了。有兴趣的可以自己取改进一下咯。
其实这个还能上传其他任意类型文件哦，因为我们没有防护后缀名的，而且我们是用字符流传输，全都不会失真(可以当云盘来处理了~~)！！
