網上相冊（上傳與下載）

運用apache解析工具實現網上相冊

主頁：

<%@ 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>文件上傳</title>
	<script type="text/javascript">
	
	   οnlοad=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("請選擇文件");
	       }else if(msg.value=="noMultipart"){
	           alert("不支持普通表單提交");
	       }else if(msg.value=="true"){
	           alert("上傳成功");
	       }else if(msg.value=="false"){
	           alert("上傳失敗");
	       }
	   };
	</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="文件說明" name="fileMsg"></textarea></td></tr>
            <tr><td><input type="submit" value="上傳"/></td></tr>
       </table>
    </form>
    <input type="hidden" value="<%=request.getParameter("msg")%>" name="msg"/>
    <a href="showImageServlet">查看個人上傳畫冊</a>
    <a href="showAllImageServlet">查看所有圖片</a>
  </body>
</html>

servlet處理：

上傳：

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();//上傳文件名
					
					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;//存放文件目錄
					
					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();
		}
		
	}

保存數據：

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");
		else
			response.sendRedirect("index.jsp?msg=false");
	}

顯示圖片：

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);
	}

界面顯示：

<%@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>圖片展示</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">
	   οnlοad=function(){
	      var source=document.getElementsByName("source").item(0);
	      if(source.value=="noUser"){
	          alert("您對於該圖片不具有刪除權限")
	      }else if(source.value=="ok"){
	          alert("刪除圖片成功")
	      }else if(source.value=="noDel"){
	          alert("刪除圖片失敗")
	      }
	   
	   };
	</script>
  </head>
  
  <body>
  
       <table>
          <tr><th>圖片名</th><th>上傳時間</th><th>圖片</th><th>圖片說明</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") %>">刪除</a> <a href="downImageServlet?imgId=<%=img.getId() %>">下載</a></td>
          </tr>
         <%}
       
       %>
          
       </table>
       <a href="showAllImageServlet">查看所有圖片</a>
       <a href="showImageServlet">查看個人圖片</a>
       <input type="hidden" value="<%=request.getParameter("judge") %>" name="source">
  </body>
</html>

刪除圖片：

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);
		}
			
	}

下載圖片：

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"))//判斷是否爲火狐
			fileName=new String(fileName.getBytes("utf-8"), "ISO8859-1");
		else
			fileName=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();
		
	}

所用的工具類：

dom單例對象

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;
	}
}

數據保存入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();
	}

數據刪除於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讀取數據封裝值對象

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;		
	}

}

值對象：

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;
	}
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		return result;
	}
	@Override
	public 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;
	}
	@Override
	public String toString() {
		return "ImageModel [id=" + id + ", userName=" + userName
				+ ", fileUploadTime=" + fileUploadTime + ", fileName="
				+ fileName + ", newFileName=" + newFileName + ", filepath="
				+ filepath + ", fileMsg=" + fileMsg + "]";
	}

	
}

map解析成值對象的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的第二參數必須是數組
				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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