网上相册（上传与下载）
2016-07-24 00:04
274 查看
运用apache解析工具实现网上相册
主页：
servlet处理：
上传：
保存数据：
显示图片：
界面显示：
删除图片：
dom单例对象
数据保存入xml
数据删除于xml
xml读取数据封装值对象
值对象：
map解析成值对象的beanutil
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");
else
response.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");
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;
}
@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;
}
}
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- 基于jQuery实现多标签页切换的效果(web前端开发)
- 省市二级联动小案例讲解
- JavaScript学习小结之使用canvas画“哆啦A梦”时钟
- JavaScript提高网站性能优化的建议(二)
- JavaScript关于提高网站性能的几点建议(一)
- JS中的==运算： [''] == false ―>true
- 深入理解javascript作用域第二篇之词法作用域和动态作用域
- javascript中sort排序实例详解
- JavaScript表单焦点自动切换代码
- JavaScript禁止用户多次提交的两种方法
- 内容运营|公众号没话题可写？试试UGC吧~
- 周鸿祎上直播看点很多：美女、音乐、AI、豪宅，可网民最新奇的是他家门口的自动塑封鞋套
- 读懂 Android 中的代码混淆
- C++ 实现银行排队服务模拟
- ES6新特性：JavaScript中Set和WeakSet类型的数据结构
- 【codeforces】Vacations
- Android自定义view详解
- 码神学习（对象）
- 旧瓶装新酒的 Java 8 StringJoiner
- Shell脚本编程总结及速查手册