网上相册（上传与下载）

来源：互联网发布：mac os 软件开发教程编辑：程序博客网时间：2024/06/06 09:59

运用apache解析工具实现网上相册

主页：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>文件上传</title><script type="text/javascript">   onload=function(){       var msg=document.getElementsByName("msg").item(0);       if(msg.value=="noGet"){           alert("文件不支持get方式提交");       }else if(msg.value=="noFile"){           alert("请选择文件");       }else if(msg.value=="noMultipart"){           alert("不支持普通表单提交");       }else if(msg.value=="true"){           alert("上传成功");       }else if(msg.value=="false"){           alert("上传失败");       }   };</script>  </head>    <body>    <form action="uploadFileServlet" method="post" enctype="multipart/form-data">       <table>            <tr><td><input type="file" name="file"/></td></tr>            <tr><td><textarea rows="10" cols="20" title="文件说明" name="fileMsg"></textarea></td></tr>            <tr><td><input type="submit" value="上传"/></td></tr>       </table>    </form>    <input type="hidden" value="<%=request.getParameter("msg")%>" name="msg"/>    <a href="showImageServlet">查看个人上传画册</a>    <a href="showAllImageServlet">查看所有图片</a>  </body></html>

servlet处理：

上传：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.sendRedirect("index.jsp?msg=noGet");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {if(!ServletFileUpload.isMultipartContent(request)){response.sendRedirect("index.jsp?msg=noMultipart");return;}request.setCharacterEncoding("utf-8");String pathname=getServletContext().getRealPath("/images/uploadImg");File filePath=new File(pathname);if(!filePath.exists()){filePath.mkdirs();}DiskFileItemFactory factory=new DiskFileItemFactory();factory.setSizeThreshold(1024*8);factory.setRepository(filePath);ServletFileUpload upload=new ServletFileUpload(factory);long fileSizeMax=1024*1024*2;upload.setFileSizeMax(fileSizeMax);upload.setSizeMax(fileSizeMax*10);FileItem itemClose=null;try {List<FileItem> list=upload.parseRequest(request);if(list.size()==0){response.sendRedirect("index.jsp?msg=noFile");return;}String fileMsg=null;String filepath=null;String fileName=null;String newFileName=null;String fileUploadTime=null;for(FileItem item:list){itemClose=item;if(item.isFormField()){fileMsg=item.getString("utf-8");}else{if(item.getSize()==0){response.sendRedirect("index.jsp?msg=noFile");return;}fileName=item.getName();//上传文件名int index=fileName.lastIndexOf(".");String ext=fileName.substring(index);String fileIdName=UUID.randomUUID().toString().replace("-", "");newFileName=fileIdName+ext;//新文件名int hash=fileName.substring(0, index).hashCode();String fileDirPath=""+Integer.toHexString(hash&0xf)+"/"+Integer.toHexString((hash&0xf0)>>4);pathname+="/"+fileDirPath;//存放文件目录File file=new File(pathname);if(!file.exists()){file.mkdirs();}File newfile=new File(pathname+"/"+newFileName);item.write(newfile);DateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");fileUploadTime=df.format(new Date(newfile.lastModified()));filepath=newfile.getAbsolutePath().substring(newfile.getAbsolutePath().indexOf(request.getContextPath().replace("/", "\\"))).replace("\\", "/");}}request.setAttribute("userName", request.getRemoteAddr());request.setAttribute("fileName", fileName);request.setAttribute("newFileName", newFileName);request.setAttribute("filepath", filepath);request.setAttribute("fileMsg", fileMsg);request.setAttribute("fileUploadTime", fileUploadTime);request.getRequestDispatcher("/saveFileMsgServlet").forward(request, response);} catch (FileUploadException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}finally{if(itemClose!=null)itemClose.delete();}}

保存数据：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");String userName=(String)request.getAttribute("userName");String fileName=(String) request.getAttribute("fileName");String newFileName=(String) request.getAttribute("newFileName");String filepath=(String) request.getAttribute("filepath");String fileMsg=(String) request.getAttribute("fileMsg");String fileUploadTime=(String)request.getAttribute("fileUploadTime");//System.out.println(fileName+","+newFileName+","+filepath+","+fileMsg);String[] elementName=new String[]{"fileName","fileUploadTime","newFileName","filepath","fileMsg"};String[] elementText=new String[]{fileName,fileUploadTime,newFileName,filepath,fileMsg};if(Dom4jSaveFileMsg.SaveElement("userName",elementName,userName, elementText))response.sendRedirect("index.jsp?msg=true");elseresponse.sendRedirect("index.jsp?msg=false");}

显示图片：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String userName=request.getRemoteAddr();List<ImageModel> imgList=ImageForXML.getCurrentUserImages(userName);//for(ImageModel img:imgList){//System.out.println(img);//}request.setAttribute("imgList", imgList);request.getRequestDispatcher("/jsp/showImg.jsp?source=SingleUser&judge="+request.getParameter("del")).forward(request, response);}

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {List<ImageModel> imgList=ImageForXML.getAllImages();//for(ImageModel img:imgList){//System.out.println(img);//}request.setAttribute("imgList", imgList);request.getRequestDispatcher("/jsp/showImg.jsp?source=AllUser&judge="+request.getParameter("del")).forward(request, response);}

界面显示：

<%@page import="cn.hncu.uploadFile.vo.ImageModel"%><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>            <title>图片展示</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><style type="text/css">   table{      width: 60%;   }   td{      border: solid blue 2px;   }   img{      width: 300px;      height: 200px;   }</style><script type="text/javascript">   onload=function(){      var source=document.getElementsByName("source").item(0);      if(source.value=="noUser"){          alert("您对于该图片不具有删除权限")      }else if(source.value=="ok"){          alert("删除图片成功")      }else if(source.value=="noDel"){          alert("删除图片失败")      }      };</script>  </head>    <body>         <table>          <tr><th>图片名</th><th>上传时间</th><th>图片</th><th>图片说明</th><th>操作</th></tr>       <%           List<ImageModel> imgList =(List<ImageModel>)request.getAttribute("imgList");          for(ImageModel img:imgList){%>          <tr>               <td><%=img.getFileName()%></td>               <td><%=img.getFileUploadTime()%></td>               <td><a href="<%=img.getFilepath()%>"><img src="<%=img.getFilepath()%>"></a></td>               <td><%=img.getFileMsg()%></td>               <td><a href="delImgServlet?imgId=<%=img.getId() %>&source=<%=request.getParameter("source") %>">删除</a> <a href="downImageServlet?imgId=<%=img.getId() %>">下载</a></td>          </tr>         <%}              %>                 </table>       <a href="showAllImageServlet">查看所有图片</a>       <a href="showImageServlet">查看个人图片</a>       <input type="hidden" value="<%=request.getParameter("judge") %>" name="source">  </body></html>

删除图片：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String id=request.getParameter("imgId");ImageModel img=ImageForXML.getSingleImageById(id);if(!request.getRemoteAddr().equals(img.getUserName())){request.getRequestDispatcher("/showAllImageServlet?del=noUser").forward(request, response);}else{String source=request.getParameter("source");if(Dom4jDelFileMsg.delFileForXML(id)){String name=request.getContextPath();File file=new File(request.getServletContext().getRealPath(img.getFilepath().substring(name.length())));if(file.delete()){if("SingleUser".equals(source))request.getRequestDispatcher("/showImageServlet?del=ok").forward(request, response);else if("AllUser".equals(source))request.getRequestDispatcher("/showAllImageServlet?del=ok").forward(request, response);     return;}}if("SingleUser".equals(source))request.getRequestDispatcher("/showImageServlet?del=noDel").forward(request, response);else if("AllUser".equals(source))request.getRequestDispatcher("/showAllImageServlet?del=noDel").forward(request, response);}}

下载图片：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String id=request.getParameter("imgId");ImageModel img=ImageForXML.getSingleImageById(id);response.setContentType("application/force-download");response.setCharacterEncoding("utf-8");String fileName=img.getFileName();if(request.getHeader("user-agent").contains("Firefox"))//判断是否为火狐fileName=new String(fileName.getBytes("utf-8"), "ISO8859-1");elsefileName=URLEncoder.encode(fileName, "utf-8");response.setHeader("Content-Disposition", "attachment;filename=\""+fileName+"\"");String name=request.getContextPath();File file=new File(request.getServletContext().getRealPath(img.getFilepath().substring(name.length())));OutputStream out=response.getOutputStream();byte[] buf=new byte[1024];FileInputStream fin=new FileInputStream(file);int len=0;while((len=fin.read(buf))!=-1){out.write(buf, 0, len);}fin.close();out.flush();out.close();}

所用的工具类：

dom单例对象

public class DOMFactory {private static Document dom;private static String fileName;static{String name=DOMFactory.class.getSimpleName()+".class";String packageName=DOMFactory.class.getPackage().getName().replace(".", "/");String urlPath=DOMFactory.class.getResource(name).getPath();String path=urlPath.substring(0, urlPath.lastIndexOf(packageName));fileName=path+"uploadFileMsg.xml";File file=new File(fileName);if(!file.exists()){try {file.createNewFile();FileWriter pw=new FileWriter(file);pw.write("<?xml version='1.0' encoding='utf-8'?>");pw.flush();pw.close();dom=DocumentHelper.createDocument();dom.addElement("Files");SaveDom();} catch (IOException e) {e.printStackTrace();}}SAXReader sax=new SAXReader();try {dom=sax.read(new FileInputStream(file));} catch (FileNotFoundException e) {e.printStackTrace();} catch (DocumentException e) {e.printStackTrace();}}public static Document getInstance(){return dom;}public static boolean SaveDom() {OutputFormat format=OutputFormat.createPrettyPrint();format.setEncoding("utf-8");XMLWriter w=null;try {w=new XMLWriter(new FileOutputStream(fileName),format);            w.write(dom);            return true;} catch (IOException e) {e.printStackTrace();}finally{if(w!=null)try {w.close();} catch (IOException e) {e.printStackTrace();}}return false;}}

数据保存入xml

public static boolean SaveElement(String attName, String[] elementName, String userName, String[] elementText) {Document dom=DOMFactory.getInstance();Element ele=dom.getRootElement().addElement("file");ele.addAttribute("id", UUID.randomUUID().toString().replace("-", ""));if(userName!=null)ele.addAttribute(attName, userName);for(int i=0;i<elementName.length;i++){ele.addElement(elementName[i]).setText(elementText[i]);}return DOMFactory.SaveDom();}

数据删除于xml

private static Document dom=DOMFactory.getInstance();public static boolean delFileForXML(String id){return delFile("//file[@id='"+id+"']");}private static boolean delFile(String xpth){Element e=(Element) dom.selectSingleNode(xpth);if(!e.getName().equals("file"))return false;else{if(e.getParent().remove(e))return DOMFactory.SaveDom();return false;}}

xml读取数据封装值对象

public class ImageForXML {private static Document dom=DOMFactory.getInstance();private static ImageModel getSingleImage(String xpth){Element e=(Element) dom.selectSingleNode(xpth);if(!e.getName().equals("file"))return null;Map<String, String> map=new HashMap<String, String>();map.put("id", e.attributeValue("id"));map.put("userName", e.attributeValue("userName"));map.put("fileUploadTime", e.elementText("fileUploadTime"));map.put("fileName", e.elementText("fileName"));map.put("newFileName", e.elementText("newFileName"));map.put("filepath", e.elementText("filepath"));map.put("fileMsg", e.elementText("fileMsg"));        return BeanUtil.getInstance(ImageModel.class, map);}public static ImageModel getSingleImageById(String id){return getSingleImage("//file[@id='"+id+"']");}public static List<ImageModel> getCurrentUserImages(String userName){String xpath="//file[@userName='"+userName+"']";List<Element> list=dom.selectNodes(xpath);List<ImageModel> imgList=new ArrayList<ImageModel>();for(Element e:list){String id=e.attributeValue("id");imgList.add(getSingleImage("//file[@id='"+id+"']"));}return imgList;}public static List<ImageModel> getAllImages(){List<Element> list=dom.getRootElement().elements();List<ImageModel> imgList=new ArrayList<ImageModel>();for(Element e:list){String id=e.attributeValue("id");imgList.add(getSingleImage("//file[@id='"+id+"']"));}return imgList;}}

值对象：

public class ImageModel {private String id;private String userName;private String fileUploadTime;private String fileName;private String newFileName;private String filepath;private String fileMsg;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}public String getFileUploadTime() {return fileUploadTime;}public void setFileUploadTime(String fileUploadTime) {this.fileUploadTime = fileUploadTime;}public String getNewFileName() {return newFileName;}public void setNewFileName(String newFileName) {this.newFileName = newFileName;}public String getFilepath() {return filepath;}public void setFilepath(String filepath) {this.filepath = filepath;}public String getFileMsg() {return fileMsg;}public void setFileMsg(String fileMsg) {this.fileMsg = fileMsg;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + ((id == null) ? 0 : id.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;ImageModel other = (ImageModel) obj;if (id == null) {if (other.id != null)return false;} else if (!id.equals(other.id))return false;return true;}@Overridepublic String toString() {return "ImageModel [id=" + id + ", userName=" + userName+ ", fileUploadTime=" + fileUploadTime + ", fileName="+ fileName + ", newFileName=" + newFileName + ", filepath="+ filepath + ", fileMsg=" + fileMsg + "]";}}

map解析成值对象的beanutil

public class BeanUtil {public static<T> T getInstance(Class<T> cls,Map<String, ?> map){T obj=null;try {obj=cls.newInstance();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}Field[] fields=cls.getDeclaredFields();for(Field field:fields){String fieldName=field.getName();Object fieldValue=map.get(fieldName);if(fieldValue==null)continue;String fieldNameUp=fieldName.substring(0, 1).toUpperCase()+fieldName.substring(1);try {Method method=cls.getMethod("set"+fieldNameUp, field.getType());//invoke的第二参数必须是数组method.invoke(obj, getList(fieldValue));} catch (NoSuchMethodException e) {e.printStackTrace();} catch (SecurityException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}return obj;}private static Object[] getList(Object fieldValue){Object[] list=null;if(fieldValue instanceof Object[]){Object[] array=(Object[])fieldValue;if(array.length==1)list=array;else if(array.length>1){list=new Object[1];list[0]=fieldValue;}}else{list=new Object[1];list[0]=fieldValue;}return list;}}

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