精致小巧的java相册制作方法

本文实例为大家分享了java相册制作方法，供大家参考，具体内容如下

这里写图片描述

注：
1)html上的图片是静态指定的。当更新了新的图片时必须手工更新。所以使用Servlet读取本地images中的所有图片，动态显示给用户。

2)如果存在中文名的图片，由于get方式无法直接传递中文，会导致出错。

主页面?Cindex.jsp

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>小小相册</title>
 </head>

 <body>
 <!-- http://localhost:8080/photosWeb/ -->
  <h2>小小相册</h2>
  <a href="jsps/upload.jsp">上传相片</a>
  <a href="<%=request.getContextPath() %>/servlet/showAllImg">浏览相片</a>
 </body>
</html>

页面显示:

这里写图片描述

上传图片功能:

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>小小相册</title>
 </head>

 <body>
  <h2>小小相册</h2>
  <form action="<%=request.getContextPath() %>/servlet/uploadServlet" method="post" enctype="multipart/form-data">
    照片:<input type="file" name="file"/><br/>
    说明:<input type="text" name="desc"/><br/>
    <input type="submit" value="上传"/>  
  </form>
 </body>
</html>

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.RequestDispatcher;
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.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;
import cn.hncu.utils.MyUtils;

public class UploadServlet extends HttpServlet {


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

    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
    out.println(" <BODY>");
    out.print("错误信息:提交方式错误...不支持Get方式上传照片");
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
  }

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

    request.setCharacterEncoding("utf-8");
    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>上传照片页面</TITLE></HEAD>");
    out.println(" <BODY>");
    //从上传表单提取信息:一,封装成photo值对象,调用dao层存储到后台
    //          二,把上传的照片存储到服务器硬盘
    //数据库:存储照片的存储情况的信息,,,真正的文件存储到硬盘
    DiskFileItemFactory dfi=new DiskFileItemFactory();
    File file=new File("d:/a");
    if(file.exists()){
      file.mkdirs();
    }
    dfi.setRepository(file);
    ServletFileUpload upload=new ServletFileUpload(dfi);
    upload.setSizeMax(1024*1024*8);
    upload.setHeaderEncoding("utf-8");//==>request.setCharacterEncoding("utf-8");
    try {
      List<FileItem> list=upload.parseRequest(request);
      PhotoModel pm=new PhotoModel();
      InputStream in=null;
      for(FileItem fI:list){
        if(fI.isFormField()){//这个不会有临时文件
          String desc=fI.getString("utf-8");
          pm.setDesc(desc);
        }else{
          in=fI.getInputStream();
//         String filename=fI.getFieldName();
//         System.out.println("getFieldName:"+filename);
          String fileName=fI.getName();
//         System.out.println("getName:"+fileName);//测试:C:\Users\adl1\Pictures\Saved Pictures\111.jpg?
          //卫条件
          if(fileName==null||fileName.trim().equals("")){
            out.println("没有选择文件,,,请必须选择一个文件...<br/>");
            String strPath2=request.getContextPath()+"/jsps/upload.jsp";
            out.println("<a href=\""+strPath2+"\">返回上传页面</a>");
            return;
          }
          pm.setDt(MyUtils.getCurrentDataime());
          String realName=fileName.substring(fileName.lastIndexOf("\\"));//"\112.jpg"
          System.out.println(realName.substring(1, realName.length()));
          pm.setRealName(realName.substring(1, realName.length()));//把realName的"\"去掉
          //ext扩展名
          String ext=fileName.substring(fileName.lastIndexOf("."));
          pm.setExt(ext);
          String id=MyUtils.getUUID();
          pm.setId(id);
          pm.setIp(request.getRemoteAddr());
          pm.setDir(MyUtils.getDir(id));
        }
      }
      //完成photo值对象的封装,调用dao进行存储
      boolean boo=new PhotoDaoImpl().sava(pm);
      if(boo){
        //完成数据库的存储,接下来是服务器硬盘的存储
        //把照片存储到项目根目录下的photos文件夹中存储(以打散方式存储)
        String path="photos/"+pm.getDir();

//       System.out.println("path:"+path);//测试:photos/9/0
        String filePath=getServletContext().getRealPath(path);

//       System.out.println("filePath:"+filePath);//测试:D:\apache-tomcat-7.0.30\webapps\photosWeb\photos\9\0
        File dir=new File(filePath);
        if(!dir.exists()){
          dir.mkdirs();
        }
        FileUtils.copyInputStreamToFile(in, new File(filePath+"/"+pm.getId()+pm.getExt()));

//       //如果硬盘保存成功就跳转到主页面--转发
////      RequestDispatcher rd=request.getRequestDispatcher(getServletContext().getContextPath()+"/index.jsp");//"/photosWeb/photosWeb/index.jsp"
//       RequestDispatcher rd=request.getRequestDispatcher("/index.jsp");//"/photosWeb/index.jsp"g
//       //java代码块和web.xml中url的开始"/"代表项目根目录
//       rd.forward(request, response);
        //这里不能使用转发,具体重定向和转发区别:http://blog.csdn.net/xanlv/article/details/52701085


        //重定向
        response.sendRedirect(getServletContext().getContextPath()+"/index.jsp");
      }else{
        //数据库保存失败--留在上传页面
        RequestDispatcher rd=request.getRequestDispatcher("/jsps/upload..jsp");//"/photosWeb/index.jsp"
        rd.forward(request, response);
      }
    } catch (FileUploadException e) {
      throw new RuntimeException("上传失败", e);
    }finally{//清临时文件
      File f=new File("d:/a");
      File fs[]=f.listFiles();
      for(File ff:fs){
        ff.delete();
      }
    }
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
  }

}

页面显示效果:

这里写图片描述

浏览图片功能:

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.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;

public class ShowAllImgServlet 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("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>相册浏览</TITLE></HEAD>");
    out.println(" <BODY>");
    String strPath=request.getContextPath()+"/jsps/upload.jsp";
    out.println("<a href=\""+strPath+"\">返回上传页面</a>");
//String table="<table border='1px' width='100%' cellspacing='0' align='center'>"+//这种方式不可以设置水平居中
    String table="<table border='1px' width='100%' cellspacing='0' style='text-align: center;'>"+
        "<tr><th>文件名</th><th>上传日期时间</th><th>相片</th><th>相片说明</th><th>操作</th></tr>";
    out.println(table);
    //从dao层把所有的照片信息读取出来发送到前端页面
    List<PhotoModel> list=new PhotoDaoImpl().getAllPhotos();
    for(PhotoModel pm:list){
      out.println("<tr>");
      out.println("<td width=80>"+pm.getRealName());
      out.println("</td>");
      out.println("<td width=120>"+pm.getDt());
      out.println("</td>");
      String path=request.getContextPath()+"/photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
//System.out.println(path);//"/photosWeb/photos/d/7/e78e18352b42410f85dbd8df834bd718.jpg"
      //点击图片可以查看大图
      out.println("<td width=100><a href='"+path+"'><img width=100 height=100 src='"+path+"'/></a>");
      out.println("</td>");
      out.println("<td width=200>"+pm.getDesc());
      out.println("</td>");
      out.println("<td width=80><a href='"+getServletContext().getContextPath()+"/servlet/delPhoto?id="+pm.getId()+"'>删除图片</a>");
//out.println("<a href='<%=request.getContextPath()%>/servlet/down?id="+pm.getId()+"'>下载图片</a></td>");
      out.println("<br/><a href='"+getServletContext().getContextPath()+"/servlet/down?id="+pm.getId()+"'>下载图片</a></td>");

      out.println("</tr>");

    }
    out.println("</table>");
    out.println(" </BODY>");
    out.println("</HTML>");
    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("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
    out.println(" <BODY>");

    out.print("不支持Post方式。。。");
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
  }

}

页面显示效果:

删除功能:

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.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;

public class DelPhotoServlet 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("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>删除照片页面</TITLE></HEAD>");
    out.println(" <BODY>");
    String id=request.getParameter("id");
    String ip=request.getRemoteAddr();
    PhotoDaoImpl dao=new PhotoDaoImpl();
    PhotoModel pm=dao.getSingleById(id);
    if(pm!=null){
      if(!pm.getIp().equals(ip)){
        out.println("您没有该图片的权限去删除...");
        String strPath=request.getContextPath()+"/servlet/showAllImg";
        out.println("<br/><a href=\""+strPath+"\">返回继续浏览</a>");

        return ;
      }
      //删除包含两部分工作：清除数据库中的信息 和 删除服务器硬盘中的图片文件
      //1清除数据库中的信息
      boolean boo = dao.del(id);
      //2删除服务器硬盘中的图片文件
      if(boo){
        String path="photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
        String filePath=getServletContext().getRealPath(path);
        File f=new File(filePath);
        if(f.exists()){
          f.delete();
        }
        String strPath=request.getContextPath()+"/servlet/showAllImg";
//       System.out.println(strPath);///photosWeb/servlet/showPhotos
        out.println("删除成功...<br/><a href=\""+strPath+"\">返回浏览</a>");
      }else{
        out.println("删除数据库信息失败");
      }
    }else{
      out.println("文件不存在...");
      String strPath=request.getContextPath()+"/servlet/showAllImg";
      out.println("<br/><a href=\""+strPath+"\">返回继续浏览</a>");

    }
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
  }

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

    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>删除照片页面</TITLE></HEAD>");
    out.println(" <BODY>");
    out.print("不支持POST方式...");
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
  }

}

页面显示:

这里写图片描述

下载功能:
1.在HTML页面上使用超连接指向要下载的文件（不安全容易被盗链）。
问题：
如何确定本地资源？
ServletContext ?C 代表一个web项目。一个web项目只有一个ServletContext对像。
getRealPath(“/”); //d:/prm/tom/web/

需求分析：
在实际的开发中，下载哪一个文件，都是由用户动态选择的。
如，在我们项目images目录下，存在着很多图片文件。用户在页面上显示所有图片，用户可以点下载连接下载喜欢的图片。

详细设计：
使用静态网页显示所有图片。给每一个图片一个下以下载的超连接。
在超连接后面传递要下载的图片id。
在serivice中动态接收图片名。完成下载。

package cn.hncu.servlet;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.FileUtils;

import cn.hncu.dao.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;

public class DownServlet extends HttpServlet {


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

    //获取被下载图片的信息
    tring id=request.getParameter("id");
    PhotoModel pm=new PhotoDaoImpl().getSingleById(id);
    if(pm==null){
      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>A Servlet</TITLE></HEAD>");
      out.println(" <BODY>");
      response.getWriter().println("alert('该文本已不存在...')");
      out.println(" </BODY>");
      out.println("</HTML>");
      out.flush();
      out.close();
      //getServletContext().getContextPath()
      RequestDispatcher rd=request.getRequestDispatcher("/servlet/down");//"/photosWeb/index.jsp"
      //java代码块和web.xml中url的开始"/"代表项目根目录
      rd.forward(request, response);
    }else{

      //真正下载: 把服务器硬盘的照片文件读取出来发送给客户端(设置响应头)
      //获取真实的文件
      String realName=pm.getRealName();
      realName=URLEncoder.encode(realName, "utf-8");//如果是中文名必须转码，防止文件名中文乱码
//   InputStream in=DownServlet.class.getClassLoader().getResourceAsStream(realName);
      //设置显示类型为下载 
      response.setContentType("application/force-download");
      //设置响应头
      response.setHeader("content-Disposition", "attachment;filename=\""+realName+"\"");

//   String path=request.getContextPath()+"/photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
      String path="photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
      String filePath=getServletContext().getRealPath(path);
      FileUtils.copyInputStreamToFile(request.getInputStream(), new File(filePath));
      InputStream in=new FileInputStream(filePath);
      OutputStream o=response.getOutputStream();
      byte b[]=new byte[1024];
      int len=0;
      while((len=in.read(b))!=-1){
        o.write(b, 0, len);
      }
      o.close();

    }
  }

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

    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
    out.println(" <BODY>");
    out.print(" 不支持");
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
  }

}

页面显示效果:

配置文件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.servlet.UploadServlet</servlet-class>
 </servlet>
 <servlet>
  <servlet-name>ShowAllImgServlet</servlet-name>
  <servlet-class>cn.hncu.servlet.ShowAllImgServlet</servlet-class>
 </servlet>
 <servlet>
  <servlet-name>DownServlet</servlet-name>
  <servlet-class>cn.hncu.servlet.DownServlet</servlet-class>
 </servlet>
 <servlet>
  <servlet-name>DelPhotoServlet</servlet-name>
  <servlet-class>cn.hncu.servlet.DelPhotoServlet</servlet-class>
 </servlet>



 <servlet-mapping>
  <servlet-name>UploadServlet</servlet-name>
  <url-pattern>/servlet/uploadServlet</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>ShowAllImgServlet</servlet-name>
  <url-pattern>/servlet/showAllImg</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>DownServlet</servlet-name>
  <url-pattern>/servlet/down</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>DelPhotoServlet</servlet-name>
  <url-pattern>/servlet/delPhoto</url-pattern>
 </servlet-mapping>  
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

数据库:photos.xml

<?xml version="1.0" encoding="UTF-8"?>
<photos>
  <!-- 数据库设计
    <photo id="uuid" realName="真实文件名.jpg" 
    dT="2016-10-03 19:51:31" ext=".jpg" dir="a/5"
    ip="192.168.12.12">
    <desc>照片说明信息</desc>
    </photo>
   -->
</photos>

值对象:PhotoModel.java

package cn.hncu.domain;

public class PhotoModel {

  //photo值对象
  private String id;//UUID
  private String realName;//照片真实文件名
  private String ext;//扩展名
  private String dir;//文件打撒后存储的目录
  private String dt;//上传日期时间
  private String ip;//上传客户端的ip地址
  private String desc;//照片说明
  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 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 getDt() {
    return dt;
  }
  public void setDt(String dt) {
    this.dt = dt;
  }
  public String getIp() {
    return ip;
  }
  public void setIp(String ip) {
    this.ip = ip;
  }
  public String Dreturn desc;
  }
  public void setDesc(String desc) {
    this.desc = desc;
  }

}

dao层:这里简写了,只写了实现类PhotoDaoImpl.java

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.PhotoModel;
import cn.hncu.utils.DomFactory;

public class PhotoDaoImpl {

  public boolean sava(PhotoModel pm){
    Document dom=DomFactory.getDom();
    Element root=dom.getRootElement();
    Element e=root.addElement("photo");
    e.addAttribute("id", pm.getId());
    e.addAttribute("dir", pm.getDir());
    e.addAttribute("dt", pm.getDt());
    e.addAttribute("ext", pm.getExt());
    e.addAttribute("ip", pm.getIp());
    e.addAttribute("realName", pm.getRealName());
    e.addElement("desc").setText(pm.getDesc());
    boolean b=DomFactory.save();
    if(b){
      return true;
    }
    return false;
  }
  public List<PhotoModel> getAllPhotos(){
    List<PhotoModel> li=new ArrayList<PhotoModel>();

    Document dom=DomFactory.getDom();
    Element e=dom.getRootElement();
    Iterator<Element> it=e.elementIterator();
    while(it.hasNext()){
      Element ie=it.next();
      PhotoModel pm=new PhotoModel();
      pm.setId(ie.attributeValue("id"));
      pm.setDir(ie.attributeValue("dir"));
      pm.setDt(ie.attributeValue("dt"));
      pm.setExt(ie.attributeValue("ext"));
      pm.setIp(ie.attributeValue("ip"));
      pm.setRealName(ie.attributeValue("realName"));

      pm.setDesc(ie.elementText("desc"));
      li.add(pm);
    }
    return li;


  }
  public PhotoModel getSingleById(String id){
    List<PhotoModel> li=getAllPhotos();
    PhotoModel pm=new PhotoModel();
    for(PhotoModel p:li){
      if(p.getId().equals(id)){
        return p;
      }
    }
    return null;


  }
  public boolean del(String id) {
    Document dom=DomFactory.getDom();
    Element e=(Element) dom.selectSingleNode("//photo[@id='"+id+"']");
    return e.getParent().remove(e);
  }
}

工具类:

package cn.hncu.utils;

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

public class MyUtils {

  private MyUtils() {
  }
  public static String getUUID(){
    return UUID.randomUUID().toString().replace("-", "");
  }
  private static SimpleDateFormat sdf=new SimpleDateFormat("yy-MM-dd HH:mm:ss");
  public static String getCurrentDataime(){
    return sdf.format(new Date());
  }
  public static String getDir(String uuid){
    String dir1=Integer.toHexString(uuid.hashCode()&0xf);
    String dir2=Integer.toHexString((uuid.hashCode()&0xf0)>>4);

    return dir1+"/"+dir2;
  }
}

package cn.hncu.utils;

import java.io.FileOutputStream;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class DomFactory {
  private static Document dom;
  private static String fileName;
  static{
    try {
      SAXReader r=new SAXReader();
      //获取src下的资源文件
      fileName=DomFactory.class.getClassLoader().getResource("photos.xml").getPath();
      System.out.println("users.xml的路径:"+fileName);//"/D:/apache-tomcat-7.0.30/webapps/photosWeb/WEB-INF/classes/photos.xml"
      //注意:获取tomcat中当前项目classpath下的资源方式
      dom=r.read(fileName);
    } catch (DocumentException e) {
      e.printStackTrace();
    }
  }
  public static Document getDom(){
    return dom;
  }
  public static boolean save(){
    XMLWriter w;
    try {
      w = new XMLWriter(new FileOutputStream(fileName));
      w.write(dom);
      w.close();
      return true;
    } catch (Exception e) {
      return false;
    }
  }
}

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