Web---自己写的一个简单云相册~ - 成就云开发者社区

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:

代码语言：javascript

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<?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:

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<%@ 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 = &#34;&lt;td&gt;选择文件：&lt;/td&gt;&#34;+
            &#34;&lt;td&gt; &lt;input type=&#39;file&#39; name=&#39;file&#34;+t+&#34;&#39;&gt; &lt;/td&gt; &#34;+
            &#34;&lt;td&gt;文件说明：&lt;/td&gt;&#34;+
            &#34;&lt;td&gt; &lt;input type=&#39;text&#39; name=&#39;text&#34;+t+&#34;&#39;&gt; &lt;/td&gt; &#34;+
            &#34;&lt;td&gt; &lt;input type=&#39;button&#39; value=&#39;删除文件&#39; onclick=&#39;delFile(this)&#39;&gt; &lt;/td&gt;&#34;;
        tr.insertAdjacentHTML(&#34;beforeBegin&#34;,str);
    }

    function move(){
        window.kk=&#34;/myPhoto/cloudPhoto&#34;;
    }
&lt;/script&gt;

&lt;style type=&#34;text/css&#34;&gt;
    #font{
        color:red;
    }

&lt;/style&gt;

</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" bordercolor="red">

<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:

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<?xml version="1.0" encoding="UTF-8"?>

<photos>
</photos>

MyUtils.java:

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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(&#34;-&#34;, &#34;&#34;);
}

/**
 * @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() &amp; 0xf );
    String dir2 = Integer.toHexString( (uuid.hashCode() &amp; 0xf0)&gt;&gt;4 );
    return &#34;/&#34;+dir1+&#34;/&#34;+dir2;
}

//日期时间格式
private static SimpleDateFormat sdf = new SimpleDateFormat(&#34;yyyy年MM月dd日 HH:mm:ss&#34;);
/**
 * @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:

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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(&#34;[@uuid=&#39;&#34;+uuid+&#34;&#39;]&#34;);
    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

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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:

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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&lt;PhotoModel&gt; 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:

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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(&#34;photo&#34;);
    p.addAttribute(&#34;uuid&#34;, photo.getUuid());
    p.addAttribute(&#34;realName&#34;, photo.getRealName());
    p.addAttribute(&#34;dateTime&#34;, photo.getDateTime());
    p.addAttribute(&#34;ip&#34;, photo.getIp());
    p.addAttribute(&#34;ext&#34;, photo.getExt());
    p.addAttribute(&#34;dir&#34;, photo.getDir());
    p.addAttribute(&#34;desc&#34;, photo.getDesc());
    return Dom4jFactory.save();
}

@Override
public List&lt;PhotoModel&gt; getAll() {
    List&lt;PhotoModel&gt; list = new ArrayList&lt;PhotoModel&gt;();
    Document dom = Dom4jFactory.getDocument();
    Element root = dom.getRootElement();
    Iterator&lt;Element&gt; it = root.elementIterator(&#34;photo&#34;);
    //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&lt;Node&gt; lists = dom.selectNodes(&#34;//photo[@uuid]&#34;);
    //Iterator&lt;Node&gt; it = lists.iterator();
    while(it.hasNext()){
        Element e = it.next();
        PhotoModel photo = new PhotoModel();
        photo.setUuid(e.attributeValue(&#34;uuid&#34;));
        photo.setRealName(e.attributeValue(&#34;realName&#34;));
        photo.setDateTime(e.attributeValue(&#34;dateTime&#34;));
        photo.setExt(e.attributeValue(&#34;ext&#34;));
        photo.setIp(e.attributeValue(&#34;ip&#34;));
        photo.setDir(e.attributeValue(&#34;dir&#34;));
        photo.setDesc(e.attributeValue(&#34;desc&#34;));
        list.add(photo);
    }
    return list;
}

@Override
public PhotoModel getSingleByUuid(String uuid) {
    List&lt;PhotoModel&gt; 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(&#34;//photo[@uuid=&#39;&#34;+uuid.trim()+&#34;&#39;]&#34;);
    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:

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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:

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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(&#34;&lt;h1&gt;不支持普通表单的提交方式！&lt;/h1&gt;&#34;);
        return;
    }

    File file = new File(&#34;d:/photoCache&#34;);
    if(!file.exists()){
        file.mkdir();
    }

    DiskFileItemFactory fiFactory = new DiskFileItemFactory(1024*10,file);

    ServletFileUpload upload = new ServletFileUpload(fiFactory);
    upload.setHeaderEncoding(&#34;utf-8&#34;);//设置文件名编码
    String path = getServletContext().getRealPath(&#34;/photos&#34;);


    FileItem fi = null;
    try {
        List&lt;FileItem&gt; list = upload.parseRequest(request);
        PhotoModel photo = new PhotoModel();//数据封装---需要7个属性
        photo.setRealName(&#34;&#34;);
        int cont=0;
        for(FileItem f:list){
            if(cont!=0 &amp;&amp; cont%2==0 &amp;&amp; !photo.getRealName().equals(&#34;&#34;)){
                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(&#34;utf-8&#34;);
                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(&#34;&#34;);
                    cont++;
                    continue;
                }
                String fileName = fi.getName();
                fileName = fileName.substring( fileName.lastIndexOf(&#34;\\&#34;)+1);//真实文件名
                photo.setRealName(fileName);//#2
                String ext = fileName.substring(fileName.lastIndexOf(&#34;.&#34;));//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()+&#34;/&#34;+photo.getUuid()+photo.getExt()));


            }

            cont++;

            if(cont%2==0 &amp;&amp; !photo.getRealName().equals(&#34;&#34;)){
                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(&#34;&lt;h1&gt;上传成功！&lt;/h1&gt;&#34;);
            out.print(&#34;&lt;a href=&#39;javascript:history.go(-1)&#39;&gt;返回上一页&lt;/a&gt; &#34;);
        }else{
            out.print(&#34;&lt;h1&gt;上传失败！&lt;/h1&gt;&#34;);
            out.print(&#34;&lt;a href=&#39;javascript:history.go(-1)&#39;&gt;返回上一页&lt;/a&gt; &#34;);
        }
    }
}

}

显示所有文件-cloudPhotoServlet.java

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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(&#34;text/html;charset=utf-8&#34;);
    PrintWriter out = response.getWriter();
    out.println(&#34;&lt;!DOCTYPE HTML PUBLIC \&#34;-//W3C//DTD HTML 4.01 Transitional//EN\&#34;&gt;&#34;);
    out.println(&#34;&lt;HTML&gt;&#34;);
    out.println(&#34;  &lt;HEAD&gt;&lt;TITLE&gt;CHX云相册&lt;/TITLE&gt;&lt;/HEAD&gt;&#34;);
    out.println(&#34;  &lt;BODY&gt;&#34;);

    out.println(&#34;&lt;table border=&#39;1px&#39; bordercolor=&#39;red&#39;&gt;&#34;);
    out.println(&#34;&lt;tr&gt;&#34;);
    out.println(&#34;&lt;td&gt;文件名&lt;/td&gt;&#34;);
    out.println(&#34;&lt;td&gt;上传时间&#34;);
    out.println(&#34;&lt;td&gt;文件&lt;/td&gt;&#34;);
    out.println(&#34;&lt;td&gt;文件说明&lt;/td&gt;&#34;);
    out.println(&#34;&lt;td&gt;操作&lt;/td&gt; &#34;);
    out.println(&#34;&lt;/tr&gt;&#34;);

    String tdWH = &#34;style=&#39;width:200px; height:200px;&#39;&#34;;

    // 显示所有图片
    PhotoDao dao = PhotoDaoFactory.getPhotoDao();
    List&lt;PhotoModel&gt; photos = dao.getAll();
    for (PhotoModel photo : photos) {
        String fileName = photo.getRealName();
        String time = photo.getDateTime();

        // 输出图片
        String path = request.getContextPath() + &#34;/photos/&#34;
                + photo.getDir() + &#34;/&#34; + photo.getUuid() + photo.getExt();
        // System.out.println(path);
        // /myPhoto/photos//7/c/a1237a48a6aa451cb22fa78b15bafcea.jpg
        String img = &#34;&lt;a href=&#39;&#34; + path + &#34;&#39;&gt;&lt;img src=&#39;&#34; + path + &#34;&#39;/&gt;&lt;/a&gt;&#34;;
        String desc = photo.getDesc();

        String delStr = &#34;&lt;a href=&#39;/myPhoto/servlet/DelServlet?uuid=&#34;
                + photo.getUuid() + &#34;&#39;&gt;删除&lt;/a&gt;&#34;;
        String downStr = &#34;&lt;a href=&#39;/myPhoto/servlet/DownServlet?uuid=&#34;
                + photo.getUuid() + &#34;&#39;&gt;下载&lt;/a&gt;&#34;;

        out.println(&#34;&lt;tr&gt;&#34;);
        out.println(&#34;&lt;td &#34; + tdWH + &#34;&gt; &#34; + fileName + &#34; &lt;/td&gt;&#34;);
        out.println(&#34;&lt;td &#34; + tdWH + &#34;&gt;&#34; + time + &#34;&lt;/td&gt;&#34;);
        out.println(&#34;&lt;td &#34; + tdWH + &#34;&gt;&#34; + img + &#34;&lt;/td&gt;&#34;);
        out.println(&#34;&lt;td &#34; + tdWH + &#34;&gt;&#34; + desc + &#34;&lt;/td&gt;&#34;);
        out.println(&#34;&lt;td &#34; + tdWH + &#34;&gt;&#34; + delStr + &#34;&amp;nbsp;&#34; + downStr
                + &#34;&lt;/td&gt;&#34;);
        out.println(&#34;&lt;/tr&gt;&#34;);
    }

    out.println(&#34;&lt;tr&gt;&#34;);
    out.println(&#34;&lt;/tr&gt;&#34;);

    out.println(&#34;&lt;/table&gt;&#34;);

    out.println(&#34;  &lt;/BODY&gt;&#34;);
    out.println(&#34;&lt;/HTML&gt;&#34;);
    out.flush();
    out.close();
}

}

删除文件-DelServlet.java

代码语言：javascript

复制

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(&#34;uuid&#34;);
    String ip = request.getRemoteAddr();
    response.setContentType(&#34;text/html;charset=utf-8&#34;);

    PrintWriter out = response.getWriter();

    PhotoModel photo = dao.getSingleByUuid(uuid);

    if(photo!=null){
        if(!photo.getIp().equals(ip)){
            out.print(&#34;&lt;h1&gt;你没有权限删除这个文件！！！&lt;/h1&gt;&#34;);
            out.print(&#34;&lt;a href=&#39;javascript:history.go(-1)&#39;&gt;返回上一页&lt;/a&gt; &#34;);
            return ;
        }

        //1.删除数据库中的信息
        boolean boo = dao.deleteXml(uuid);

        if(boo){
            String fileName = &#34;photos/&#34;+photo.getDir()+&#34;/&#34;+photo.getUuid()+photo.getExt();
            String pathFileName = getServletContext().getRealPath(fileName);
            if(dao.deleteFile(pathFileName)){
                //重定向到相册页面
                response.sendRedirect(&#34;/myPhoto/cloudPhoto?pwd=chx&#34;);
            }else{
                out.print(&#34;&lt;h1&gt;无法从服务器中删除，文件正在被占用！！！&lt;/h1&gt;&#34;);
                out.print(&#34;&lt;a href=&#39;javascript:history.go(-1)&#39;&gt;返回上一页&lt;/a&gt; &#34;);
            }
        }else{
            out.print(&#34;&lt;h1&gt;该文件已经不存在！！！&lt;/h1&gt;&#34;);
            out.print(&#34;&lt;a href=&#39;javascript:history.go(-1)&#39;&gt;返回上一页&lt;/a&gt; &#34;);
        }
    }
}

}

下载文件-DownServlet.java

代码语言：javascript

复制

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(&#34;uuid&#34;);
    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(&#34;application/force-download&#34;);

        String realName = photo.getRealName();

        String agent = request.getHeader(&#34;User-Agent&#34;);
        System.out.println(agent);
        if(agent.indexOf(&#34;Mozilla&#34;)!=-1){//火狐浏览器
            response.setHeader(&#34;Content-Disposition&#34;, &#34;attachment;filename=&#34;+ new String(realName.getBytes(&#34;GB2312&#34;),&#34;ISO-8859-1&#34;));
        }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, &#34;utf-8&#34;);//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(&#34;Content-Disposition&#34;, &#34;attachment;filename=\&#34;&#34;+realName+&#34;\&#34;&#34;);
            //注意：“cttachment;”不能少，否则浏览器会直接在新窗口中打开
        }

        String fileName = &#34;photos/&#34; + photo.getDir()+&#34;/&#34;+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(&#34;text/html;charset=utf-8&#34;);
        response.getWriter().println(&#34;&lt;h1&gt;该文件已经被删除了&lt;/h1&gt;&#34;);
    }
}

}

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~~)！！