功能文件的上传，下载和管理
技术：1.用xml当做数据库存储信息（dom4j，xpath)
2.Java表单的文件上传和下载
3.文件目录的打散 （ Hash目录是一种优化文件存储性能的方法）
需要的jar包：
commons-fileupload-1.2.2.jar、commons-io-2.1.jar、dom4j-1.6.1.jar和jaxen-1.1-beta-6.jar
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先写index.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>相册管理系统</title>
</head>
<body>
<h1>我的小相册</h1>
<a href="jsps/upload.jsp">上传相册</a>
<a href="servlets/ShowServlet">浏览相册</a>
</body>
</html>
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upload.jsp是下载页面放在jsps目录下
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<h1>相处上传</h1>
<form action="<%=request.getContextPath()%>/servlets/UploadServlet"
method="post" enctype="multipart/form-data">
文件:<input type="file" name="file1"/><br/>
说明:<input type="text" name="desc" /><br/>
<input type="submit" value="上传" />
</form>
</body>
</html>
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photos.xml放在src目录下
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<?xml version="1.0" encoding="UTF-8"?>
<photos>
</photos>
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在写值对象PhotoModel
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package cn.hncu.demain;
public class PhotoModel {
private String id;
private String realName;
private String ext;
private String dir;
private String dateTime;
private String ip;
private String desc;
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 getDateTime() {
return dateTime;
}
public void setDateTime(String dateTime) {
this.dateTime = dateTime;
}
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "PhotoModel [id=" + id + ", realName=" + realName + ", ext="
+ ext + ", dir=" + dir + ", dateTime=" + dateTime + ", ip="
+ ip + ", desc=" + desc + "]";
}
}
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写工具类两个：
MyUtil（日期格式化，目录打散代码，随机id代码)
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package cn.hncu.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
public class MyUtils {
private MyUtils() {
}
private static SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");
public static String getCurrentDateTime(){
return format.format(new Date());
}
public static String getUUid(){
UUID uuid=UUID.randomUUID();
String id=uuid.toString().replaceAll("-", "");
return id;
}
public static String getDir(String uuid){
String dir1=Integer.toHexString(uuid.hashCode() & 0xf);
String dir2=Integer.toHexString((uuid.hashCode() & 0xf0)>>4);
return dir1+"/"+dir2;
}
}
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Dom4jFactory(dom4j的相关操作，获取document对象，保存操作)
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package cn.hncu.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.UnsupportedEncodingException;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class Dom4jFactory {
private static Document dom = null;
private static String path;
static {
try {
SAXReader sax = new SAXReader();
// 学习一下服务器下的资源路径加载方式(因为我们的资源已经从MyEclipse中发布到Tomcat服务器中了，所以跟原来纯Java项目不一样了)
// 利用当前类找到它的类加载器，然后通过该类加载器再去获得资源路径
path = Dom4jFactory.class.getClassLoader().getResource("photos.xml")
.getPath();
dom = sax.read(new FileInputStream(path));
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
public static Document getDom(){
return dom;
}
public static boolean save(){
try {
OutputFormat format=new OutputFormat();
format.setEncoding("utf-8");
XMLWriter w = new XMLWriter( new FileOutputStream(new File(path)),format);
w.write(dom);
w.close();
return true;
} catch (Exception e) {
return false;
}
}
}
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从底层写PhotoDao
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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.demain.PhotoModel;
import cn.hncu.utils.Dom4jFactory;
public class PhotoDao {
//添加
public boolean add(PhotoModel photo){
Document dom=Dom4jFactory.getDom();
Element root=dom.getRootElement();
Element ePhoto=root.addElement("photo");
ePhoto.addAttribute("id", photo.getId());
ePhoto.addAttribute("realName", photo.getRealName());
ePhoto.addAttribute("dir", photo.getDir());
ePhoto.addAttribute("ip", photo.getIp());
ePhoto.addAttribute("dateTime", photo.getDateTime());
ePhoto.addAttribute("ext", photo.getExt());
ePhoto.addElement("desc").setText(photo.getDesc());
boolean boo=Dom4jFactory.save();
return boo;
}
//浏览
public List<PhotoModel> getAll(){
Document dom=Dom4jFactory.getDom();
List<PhotoModel> list=new ArrayList<PhotoModel>();
Element root=dom.getRootElement();
Iterator<Element> it=root.elementIterator();
while(it.hasNext()){
PhotoModel photo=new PhotoModel();
Element e=it.next();
photo.setId(e.attributeValue("id"));
photo.setDateTime(e.attributeValue("dateTime"));
photo.setDir(e.attributeValue("dir"));
photo.setExt(e.attributeValue("ext"));
photo.setIp(e.attributeValue("ip"));
photo.setRealName(e.attributeValue("realName"));
photo.setDesc(e.elementText("desc"));
list.add(photo);
}
return list;
}
public PhotoModel getSingleById(String id) {
Document dom=Dom4jFactory.getDom();
List<PhotoModel> list=getAll();
for(PhotoModel photo:list){
if(photo.getId().equals(id)){
return photo;
}
}
return null;
}
public boolean del(String id) {
Document dom=Dom4jFactory.getDom();
Element e=(Element) dom.selectSingleNode("//photo[@id='"+id.trim()+"']");
return e.getParent().remove(e);
}
}
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最后写四个servlet
UploadServlet 上传Servlet代码
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package cn.hncu.servlets;
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.demain.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;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.println("不支持get方式上传!");
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();
String path=request.getServletContext().getRealPath("/photos");
DiskFileItemFactory factory=new DiskFileItemFactory();
factory.setRepository(new File("g:/a"));
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(1024*1024*10);//最大10M
upload.setHeaderEncoding("utf-8");//用于设置文件名的编码，相当于：request.setCharacterEncoding("utf-8");
FileItem fi=null;
try {
List<FileItem> list=upload.parseRequest(request);
PhotoModel photo = new PhotoModel();//数据封装---需要7个属性
boolean boo=false;
InputStream in = null;
for(FileItem fi2:list){
fi=fi2;
if(fi.isFormField()){
String desc=fi.getString("utf-8");
photo.setDesc(desc);//desc
}else{
in=fi.getInputStream();
String realName=fi.getName();
if(realName==null || realName.trim().equals("")){
out.print("没有选择文件!");
return;
}
if(realName.indexOf("\\")!=-1){
realName=realName.substring(realName.lastIndexOf("\\")+1);
}
photo.setRealName(realName);//真实文件名
String ext=realName.substring(realName.lastIndexOf("."));
photo.setExt(ext);//3
photo.setDateTime(MyUtils.getCurrentDateTime());//4
photo.setId(MyUtils.getUUid());//5
photo.setDir(MyUtils.getDir(photo.getId()));//6
photo.setIp(request.getRemoteAddr());//7
}
}
//把相片信息存储到数据库
PhotoDao dao=new PhotoDao();
boo=dao.add(photo);
//如果上面的相片信息保存成功，那么才开始接收图片文件，把它保存到服务器硬盘
if(boo){
System.out.println(dao);
path=path+"/"+photo.getDir();
File dir=new File(path);
if(!dir.exists()){
dir.mkdirs();
}
String fileName=path+"/"+photo.getId()+photo.getExt();
FileUtils.copyInputStreamToFile(in, new File(fileName));
String strPath = request.getContextPath()+"/servlets/ShowServlet";
out.print("上传成功!<a href='"+strPath+"'>浏览相册</a>");
}else{
out.print("上传失败!");
}
} catch (FileUploadException e) {
throw new RuntimeException("上传失败！", e);
}finally{
if(fi!=null){
fi.delete();
}
}
out.flush();
out.close();
}
}
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ShowServlet 浏览相册的Servlet端
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package cn.hncu.servlets;
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.demain.PhotoModel;
public class ShowServlet extends HttpServlet {
IOException if an error occurred
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");
request.setCharacterEncoding("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>");
String table="<table border='1' width='100%'>"+
"<tr><th>文件名</th><th>上传ip</th><th>上传时间</th><th>图片</th><th>说明</th><th>操作</th></tr>"
;
out.print(table);
PhotoDao dao=new PhotoDao();
List<PhotoModel> list=dao.getAll();
for(PhotoModel p:list){
out.print("<tr>");
out.println("<td>"+p.getRealName()+"</td>");
out.println("<td>"+p.getIp()+"</td>");
out.println("<td>"+p.getDateTime()+"</td>");
//输出图片
String path=request.getContextPath()+"/photos/"+p.getDir()+"/"+p.getId()+p.getExt();
out.println("<td><a href='"+path+"'><img src='"+path+"' width='200' height='200'></img></a></td>");
String op="<a href='"+request.getContextPath()+"/servlets/DelServlet?id="+p.getId()+"'>删除</a> ";
out.println("<td>"+p.getDesc()+"</td>");
op+="<a href='"+request.getContextPath()+"/servlets/DownServlet?id="+p.getId()+"'>下载</a>";
out.println("<td>"+op+"</td>");
out.print("</tr>");
}
out.println("</table>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
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DownServlet 下载的服务器代码
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package cn.hncu.servlets;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
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.demain.PhotoModel;
public class DownServlet 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 {
String id=request.getParameter("id");
response.setContentType("application/force-download");
PhotoModel p=new PhotoDao().getSingleById(id);
if(p!=null){
String realName=p.getRealName();
realName=new String(realName.getBytes("iso8859-1"),"utf-8");
response.setHeader("content-Disposition", "attachment;filename=\""+realName+"\"");
String relpath=getServletContext().getRealPath("/photos/"+p.getDir()+"/"+p.getId()+p.getExt());
InputStream in=new FileInputStream(relpath);
OutputStream out=response.getOutputStream();
System.out.println(relpath);
byte buf[]=new byte[1024];
int len=0;
while ((len=in.read(buf))!=-1){
out.write(buf,0,len);
}
out.close();
}else{
response.setContentType("text/html;charset=utf-8");
response.getWriter().println("该文件已经被删除!");
}
}
}
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Delservlet 删除操作的服务器
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package cn.hncu.servlets;
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 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.demain.PhotoModel;
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 {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
String id=request.getParameter("id");
PhotoModel p=new PhotoDao().getSingleById(id);
if(p!=null){
if(!p.getIp().equals(request.getRemoteAddr())){
out.println("你无权进行删除！");
return;
}
//※※※※以下部分课后补敲的!!!!
//1删除数据库中的信息
PhotoDao dao=new PhotoDao();
boolean boo=dao.del(id);
//2把服务器硬盘中的文件删除
if(boo){
String fileName="photos/"+p.getDir()+"/"+p.getId()+p.getExt();
String pathFileName = getServletContext().getRealPath(fileName);
File f=new File(pathFileName);
if(f.exists()){
f.delete();
}
String strPath = request.getContextPath()+"/servlets/ShowServlet";
out.println("相片删除成功!<a href='"+strPath+"'>浏览相册</a>");
}else{
out.println("相片删除失败!");
}
}else{
response.setContentType("text/html;charset=utf-8");
response.getWriter().println("该文件不存在!");
}
}
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。