相册管理(dom4j+servlet+文件上传与下载)

index.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>



  
    
  
  
  
    
小相册
    
    上传照片	

    
    浏览相册	

    
  

cn.hncu.dao:---这里直接写实现类了,最好是接口+实现类+工厂

PhotoDAO

package cn.hncu.dao;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;

import cn.hncu.domain.Photo;
import cn.hncu.utils.Dom4jFactory;

public class PhotoDAO {

	public boolean save(Photo photo) {
		Document dom=Dom4jFactory.getDocument();
		Element root=dom.getRootElement();
		//给root(photos>添加一个子元素
		//值对象-id,realName,dt,ext,ip,dir,desc
		Element ePhoto = root.addElement("photo");
		ePhoto.addAttribute("id", photo.getId());
		ePhoto.addAttribute("realName", photo.getRealName());
		ePhoto.addAttribute("dt", photo.getDt());
		ePhoto.addAttribute("ext", photo.getExt());
		ePhoto.addAttribute("ip", photo.getIp());
		ePhoto.addAttribute("dir", photo.getDir());
		
		ePhoto.addElement("desc").setText(photo.getDesc());
		
		//持久化
		try {
			Dom4jFactory.save();
		} catch (Exception e) {
			return false;
		}
		
		return true;
	}

	public List getAll() {
		List resList=new ArrayList();
		Document dom=Dom4jFactory.getDocument();
		Element root=dom.getRootElement();
		Iterator it = root.elementIterator("photo");
		while(it.hasNext()){
			Element ePhoto=it.next();
			Photo photo=new Photo();
			//值对象-id,realName,dt,ext,ip,dir,desc
			photo.setId(ePhoto.attributeValue("id"));
			photo.setRealName(ePhoto.attributeValue("realName"));
			photo.setDt(ePhoto.attributeValue("dt"));
			photo.setExt(ePhoto.attributeValue("ext"));
			photo.setIp(ePhoto.attributeValue("ip"));
			photo.setDir(ePhoto.attributeValue("dir"));
			photo.setDesc(ePhoto.elementText("desc"));
			
			resList.add(photo);
		}
		
		return resList;
	}

	public Photo getSingleById(String id) {
		List list=getAll();
		for(Photo photo:list){
			if(photo.getId().equals(id)){
				return photo;
			}
		}
		return null;
	}

	public boolean del(String id) {
		Document dom=Dom4jFactory.getDocument();
		String xpath="//photo[@id='"+id.trim()+"']";
		Element ePhtot = (Element) dom.selectSingleNode(xpath);
		boolean boo = ePhtot.getParent().remove(ePhtot);
		try {
			Dom4jFactory.save();
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
		return boo;
	}
	
}

cn.hncu.domain

Photo

package cn.hncu.domain;

public class Photo {
	//id,realName,dt,ext,ip,dir,desc
	private String id;		//Uuid
	private String realName;//文件的真实名
	private String dt;		//上传相片的日期时间
	private String ext;		//文件的扩展名
	private String ip;		//上传文件的用户的ip地址
	private String dir;		//文件存放目录--打散的
	private String desc;	//相片文字说明
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getRealName() {
		return realName;
	}
	public void setRealName(String realName) {
		this.realName = realName;
	}
	public String getDt() {
		return dt;
	}
	public void setDt(String dt) {
		this.dt = dt;
	}
	public String getExt() {
		return ext;
	}
	public void setExt(String ext) {
		this.ext = ext;
	}
	public String getIp() {
		return ip;
	}
	public void setIp(String ip) {
		this.ip = ip;
	}
	public String getDir() {
		return dir;
	}
	public void setDir(String dir) {
		this.dir = dir;
	}
	public String getDesc() {
		return desc;
	}
	public void setDesc(String desc) {
		this.desc = desc;
	}
	@Override
	public String toString() {
		return "Photo [id=" + id + ", realName=" + realName + ", dt=" + dt
				+ ", ext=" + ext + ", ip=" + ip + ", dir=" + dir + ", desc="
				+ desc + "]";
	}
}

photo.xml：

cn.hncu.utils：

Dom4jFactory

package cn.hncu.utils;

import java.io.File;
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.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class Dom4jFactory {
	private static Document dom;
	private static String path;
	static{
		SAXReader sax=new SAXReader();
		path=Dom4jFactory.class.getClassLoader().getResource("photo.xml").getPath();
		File file=new File(path);
		try {
			dom = sax.read(file);
		} catch (DocumentException e) {
			throw new RuntimeException(e.getMessage(), e);
		}
	}
	
	private Dom4jFactory(){
	}
	public static Document getDocument(){
		return dom;
	}
	
	public static void save(){
		try {
			XMLWriter w=new XMLWriter(new FileOutputStream(new File(path)));
			w.write(dom);
			w.close();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
}

MyUtils

package cn.hncu.utils;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

public class MyUtils {
	public static String getUuid(){
		return UUID.randomUUID().toString().replaceAll("-", "");
	}
	
	private static DateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	public static String getCurrentDT(){
		return df.format(new Date());
	}
	
	public static String  getDir(String uuid){
		int dir1=uuid.hashCode()&0xf;
		int dir2=(uuid.hashCode()&0xf0)>>4;
		return dir1+"\\"+dir2;
	}
}

cn.hncu.servlet:

ShowServlet

package cn.hncu.servlet;

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.dao.PhotoDAO;
import cn.hncu.domain.Photo;

public class ShowServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("");
		out.println("");
		out.println("  ");
		out.println("  ");
		
		String sTable=""+
						"";
		out.println(sTable);
		//获取所有相片,每个相片显示成表格的一行
		PhotoDAO dao=new PhotoDAO();
		List photos = dao.getAll();
		for(Photo photo:photos){
			out.println("");
			out.println("");	//文件名
			out.println("");		//上传时间
			//输出图片--request.getContextPath()
			String path=request.getContextPath()+"/"+"photos/"+photo.getDir()+"/"+photo.getId()+photo.getExt();
			out.println("");
			
			out.println("");	//文字说明
			
			//操作
			//通过？id=photo.getId()来传参数
			String op="删除   "
					+"下载";
			out.println("");
			
			
			out.println("");
		}
		out.println("  
文件名
 
上传时间
 
图片
 
文字说明
 
操作
 
"+photo.getRealName()+"
"+photo.getDt()+"
  
"+photo.getDesc()+"
"+op+"
");
		out.println("  ");
		out.println("");
		out.flush();
		out.close();
	}

}

DelServlet

package cn.hncu.servlet;

import java.io.File;
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.dao.PhotoDAO;
import cn.hncu.domain.Photo;

public class DelServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("");
		out.println("");
		out.println("  ");
		out.println("  ");
		
		String id=request.getParameter("id");
		String ip=request.getRemoteAddr();
		PhotoDAO dao=new PhotoDAO();
		Photo photo=dao.getSingleById(id);
		if(photo!=null){
			//1.判断是否有权删除
			if(!photo.getIp().equals(ip)){
				out.println("你无权删除别人的图片");
				return;
			}else{
				//2删除数据库中的信息
				boolean boo = dao.del(id);
				if(boo){
					//3.删除服务器磁盘文件
					String fileName="photos/"+photo.getDir()+"/"+photo.getId()+photo.getExt();
					String realFileName=getServletContext().getRealPath(fileName);
					File file=new File(realFileName);
					if(file.exists()){
						file.delete();
						
					}
					//request.getContentType()：项目根目录
					String strPath=request.getContextPath()+"/ShowServlet";
					out.println("相片删除成功! 浏览相册");
				}else{
					out.println("相片删除失败");
				}
			}
		}else{
			out.println("相片已经不存在");
		}
		
		
		out.println("  ");
		out.println("");
		out.flush();
		out.close();
	}

}

UploadServlet

package cn.hncu.servlet;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
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 org.apache.commons.io.FileUtils;

import cn.hncu.dao.PhotoDAO;
import cn.hncu.domain.Photo;
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");
		PrintWriter out = response.getWriter();
		out.println("");
		out.println("");
		out.println("  ");
		out.println("  ");
		out.println("不支持GET方式");
		out.println("  ");
		out.println("");
		out.flush();
		out.close();
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("");
		out.println("");
		out.println("  ");
		out.println("  ");
		
		request.getContentType();
//		getServletContext().getRealPath(arg0)	获取路径的绝对地址
		
//		文件上传核心入口:ServletFileUpload upload=new ServletFileUpload(fileItemFactory);
		DiskFileItemFactory fileItemFactory=new DiskFileItemFactory();
		fileItemFactory.setRepository(new File("e://a"));	//临时文件的存放目录
		
//		DiskFileItemFactory fileItemFactory2=new DiskFileItemFactory();
//		ServletFileUpload upload=new ServletFileUpload(fileItemFactory2);
//		List list = upload.parseRequest(request);
		
		ServletFileUpload upload=new ServletFileUpload(fileItemFactory);
		upload.setSizeMax(1024*1024*10);
//		request.setCharacterEncoding("utf-8");//设置上传文件的编码
		upload.setHeaderEncoding("utf-8"); 	//设置文件上传头编码
		
		FileItem fi=null;
		InputStream in=null;
		try {
			List list=upload.parseRequest(request);
			Photo photo=new Photo();		//值对象-id,realName,dt,ext,ip,dir,desc
			for(FileItem item:list){
				fi=item;
				if(item.isFormField()){	//是普通表单组件
					String desc=item.getString("utf-8");
					photo.setDesc(desc);	//desc--1
				}else{	//file表单组件
					in=fi.getInputStream();
					String fileName=item.getName();
					if(fileName==null && fileName.trim().equals("")){
						out.println("没有选择上传文件");
						return;
					}
					String realName=fileName.substring( fileName.lastIndexOf("\\")+1); //去去掉文件目录的文件名
					photo.setRealName(realName);//realName--2
					String ext=realName.substring(realName.lastIndexOf("."));
					photo.setExt(ext);	//ext--3
					photo.setDt( MyUtils.getCurrentDT());//uuid--4
					photo.setIp( request.getRemoteHost() );//ip---5
					photo.setId(MyUtils.getUuid());
					photo.setDir(MyUtils.getDir(photo.getId()));
				}
			}
			
			//调用dao层--保存photo-bean
			PhotoDAO dao=new PhotoDAO();
			//只有在文件存储到xml数据库成功后,才把照片存储到服务器中
			//1.把photo值对象包装的数据存储到数据库
			boolean boo = dao.save(photo);	
			if(boo){
				//获取文件在服务器中的存储目录
				String path=getServletContext().getRealPath("/photos");
				path=path+"/"+photo.getDir();
				File dir=new File(path);
				if(!dir.exists()){
					dir.mkdir();
				}
				
				//开始存储
				String fileName=path+"/"+photo.getId()+photo.getExt();	//存储到服务器磁盘的文件名
				//拿到FileItem的in流
//				in = fi.getInputStream();	//只有文件表单组件才有这个in流,所以只能在file表单组件中获取
				
				//2.把图片存储到服务器磁盘
				//使用FileUtil中的工具吧FileItem流的数据拷贝到File中
				FileUtils.copyInputStreamToFile(in, new File(fileName));	
				
				out.println("图片上传成功返回主界面");
			}else{
				out.println("图片上传失败");
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		} finally{
			if(fi!=null){
				fi.delete();	//删除临时文件
			}
		}
		
		
		out.println("  ");
		out.println("");
		out.flush();
		out.close();
	}

}

DownServlet

package cn.hncu.servlet;

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.dao.PhotoDAO;
import cn.hncu.domain.Photo;

public class DownServlet extends HttpServlet {

	private PhotoDAO dao=new PhotoDAO();
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String id=request.getParameter("id");
		Photo photo=dao.getSingleById(id);
		//把服务器磁盘中的相片文件读取出来,写到客户端
		if(photo!=null){
			String realName=photo.getRealName();
			
			realName=URLEncoder.encode(realName,"utf-8");
			//设置下载的响应头
			response.setContentType("application/force-download");
			response.setHeader("content-Disposition", "attachment;filename='\'"+realName+"\'");
			
			
			String fileName="/photos/"+photo.getDir()+"/"+photo.getId()+photo.getExt();//相对路径
			String pathFileName=getServletContext().getRealPath(fileName);	//真正的带盘符的路径
			InputStream in=new FileInputStream(pathFileName);
			OutputStream out=response.getOutputStream();
			byte bs[]=new byte[512];
			int len=-1;
			while((len=in.read(bs))!=-1){
				out.write(bs, 0, len);
			}
			in.close();
			out.close();
		}
	}
}