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:
我要评论
<%@ 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~~)！！
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idea 访问html页面端口号显示的是63342而不是8080
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