Servlet文件上传和下载---个人相册
2016-09-08 00:50
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这个小程序有以下功能：
上传照片、下载图片、浏览图片、删除图片(需要权限)
这个程序为了省事，dao层也没有分成接口、实现类和工厂类三个部分，就直接在dao的类中实现了想要的功能了
网页就相当于是表现层，值对象也写，servlet其实就相当于业务逻辑层了
此程序需要使用到几个jar包，导入到WEB-INF下的lib目录下：
用于文件传输：commons-fileupload-1.2.2.jar和commons-io-2.1.jar
don4j对xml文件操作：dom4j-1.6.1.jar和jaxen-1.1-beta-6.jar
在项目src下要建立一个xml文件存放上传的相片的信息，这个文件里面写上一对<photos></photos>标签，每上传一张照片就增加一对<photo>标签作为<photos>的子节点，其中photo中要添加照片的属性 id , 原文件名realName , 扩展名ext , 路径dir , 上传时间dateTime , ip地址；然后每个photo增加一个子节点<description>，其中设置text存放照片描述信息。
表现层：
主页index.jsp
值对象：
PhotoModel.java
业务逻辑层：
上传照片UploadServlet.java
DAO层
PhotoDAO.java
工具类
MyUtils.java
效果图：
主页：
上传照片：
浏览相册：
上传照片、下载图片、浏览图片、删除图片(需要权限)
这个程序为了省事，dao层也没有分成接口、实现类和工厂类三个部分，就直接在dao的类中实现了想要的功能了
网页就相当于是表现层，值对象也写，servlet其实就相当于业务逻辑层了
此程序需要使用到几个jar包，导入到WEB-INF下的lib目录下：
用于文件传输：commons-fileupload-1.2.2.jar和commons-io-2.1.jar
don4j对xml文件操作：dom4j-1.6.1.jar和jaxen-1.1-beta-6.jar
在项目src下要建立一个xml文件存放上传的相片的信息，这个文件里面写上一对<photos></photos>标签，每上传一张照片就增加一对<photo>标签作为<photos>的子节点，其中photo中要添加照片的属性 id , 原文件名realName , 扩展名ext , 路径dir , 上传时间dateTime , ip地址；然后每个photo增加一个子节点<description>，其中设置text存放照片描述信息。
表现层：
主页index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <h2>小相册</h2> <a href="jsps/upload.jsp">上传照片</a><br/> <a href="showServlet">查看相册</a> </body> </html>上传照片upload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <h2>相片上传</h2> <form action="<%=request.getContextPath() %>/uploadServlet" method="post" enctype="multipart/form-data"> 文件: <input type="file" name="file" /><br/> 说明: <input type="text" name="description" /><br/> <input type="submit" value="上传" /> </form> <br/> <a href='javascript:history.go(-1)'>返回</a> </body> </html>
值对象：
PhotoModel.java
package cn.hncu.vo;
public class PhotoModel {
private String uuid;
private String realName;
private String ext;
private String dir;
private String dateTime;
private String ip;
private String description;
public String getUuid() {
return uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
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 getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
@Override
public String toString() {
return "PhotoModel [uuid=" + uuid + ", realName=" + realName + ", ext="
+ ext + ", dir=" + dir + ", dateTime=" + dateTime + ", ip="
+ ip + ", description=" + description + "]";
}
}业务逻辑层：
上传照片UploadServlet.java
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.utils.MyUtils;
import cn.hncu.vo.PhotoModel;
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.print("不支持get方式提交");
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>");
//处理上传文件
DiskFileItemFactory factory=new DiskFileItemFactory();
factory.setRepository(new File("D:/a/b"));
ServletFileUpload upload=new ServletFileUpload(factory);
upload.setSizeMax(1024*1024*100);
request.setCharacterEncoding("utf-8");
FileItem fi=null;
try {
List<FileItem> list=upload.parseRequest(request);
InputStream in=null;
boolean boo=false;
PhotoModel photo=new PhotoModel();
//for循环是把photo的信息封装完整，，，之后(for之后)才能把该photo对象保存到数据库
for (FileItem fii:list){
fi=fii;
if (fi.isFormField()){
String description=fi.getString("utf-8");
photo.setDescription(description);
} else {
in=fi.getInputStream();
String fileName=fi.getName();
if (fileName==null||fileName.trim().equals("")){
out.print("没有选择文件!<br/><a href='javascript:history.go(-1)'>返回</a>");
return;
} else {
fileName=fileName.substring(fileName.lastIndexOf("/")+1);
photo.setRealName(fileName);//文件名
String ext=fileName.substring(fileName.lastIndexOf("."));
photo.setExt(ext);//后缀名
photo.setDateTime(MyUtils.getCurrentTime());//时间
photo.setUuid(MyUtils.getUuid());//id
photo.setDir(MyUtils.getDir(photo.getUuid()));//目录
photo.setIp(request.getRemoteAddr());//ip地址
}
}
}
//把相片信息存储到数据库
PhotoDAO dao=new PhotoDAO();
boo=dao.save(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){
String path=getServletContext().getRealPath("/photos");
path=path+"/"+photo.getDir();
File file=new File(path);
if (!file.exists()){
file.mkdirs();
}
String fileName2=path+"/"+photo.getUuid()+photo.getExt();
FileUtils.copyInputStreamToFile(in, new File(fileName2));
out.print("上传成功!<br/><a href='javascript:history.go(-1)'>返回</a>");
} else {
out.print("上传失败!<br/><a href='javascript:history.go(-1)'>返回</a>");
}
} catch (FileUploadException e) {
throw new RuntimeException("上传失败", e);
} finally {
if (fi!=null){
fi.delete();
}
}
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}浏览相册ShowServlet.javapackage 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.vo.PhotoModel;
public class ShowServlet 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 {
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>");
String table="<table border=1px width=600px >"+
"<tr><th>文件名</th> <th>上传时间</th> <th>图片</th> <th>说明</th> <th>操作</th></tr>";
out.print(table);
//显示所有的图片
PhotoDAO dao=new PhotoDAO();
List<PhotoModel> list=dao.getAll();
for (PhotoModel model:list){
out.print("<tr>");
out.print("<td width=100>"+model.getRealName()+"</td>");
out.print("<td width=100>"+model.getDateTime()+"</td>");
String path=request.getContextPath()+"/photos/"+model.getDir()+"/"+model.getUuid()+model.getExt();
out.print("<td><a href='"+path+"'><img height=200 width=200 src='"+path+"'/></a></td>");
out.print("<td width=100>"+model.getDescription()+"</td>");
String strDelete="<a href='"+request.getContextPath()+"/deleteServlet?id="+model.getUuid()+"'>删除</a>";
String strDownload="<a href='"+request.getContextPath()+"/downloadServlet?id="+model.getUuid()+"'>下载</a>";
String str=strDownload+" "+strDelete;
out.print("<td width=100>"+str+"</td>");
out.print("</tr>");
}
out.print("</table>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}下载文件DownloadServlet.javapackage 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 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.vo.PhotoModel;
public class DownloadServlet 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 {
PhotoDAO dao=new PhotoDAO();
String id=request.getParameter("id");
PhotoModel photo=dao.getSingleById(id);
if (photo!=null){
response.setContentType("application/force-download");
String realName=photo.getRealName();
realName=URLEncoder.encode(realName, "utf-8");
//设置响应头，以让客户端软件下载时能够显示该文件名
response.setHeader("content-disposition", "attachment;filename='"+realName+"'");
String fileName="photos/"+photo.getDir()+"/"+photo.getUuid()+photo.getExt();
String filePathName=getServletContext().getRealPath(fileName);
InputStream in=new FileInputStream(new File(filePathName));
OutputStream out=response.getOutputStream();
int len=0;
byte[] buf=new byte[1024];
while ((len=in.read(buf))!=-1){
out.write(buf, 0, len);
}
out.close();
} else {
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
out.print("该文件已被删除");
out.print("<br/><a href='javascript:history.go(-1)'>返回</a>");
}
}
}删除照片DeleteServlet.javapackage cn.hncu.servlets;
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.PhotoDAO;
import cn.hncu.vo.PhotoModel;
public class DeleteServlet 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 {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
String id=request.getParameter("id");
String ip=request.getRemoteAddr();
PhotoDAO dao=new PhotoDAO();
PhotoModel photo=dao.getSingleById(id);
if (photo!=null){
if (!ip.equals(photo.getIp())){
out.print("你无权删除!<br/><a href='javascript:history.go(-1)'>返回</a>");
return;
}
//1删除数据库中的信息
boolean boo=dao.delete(photo.getUuid());
//2把服务器硬盘中的文件删除
if (boo){
String fileName="photos/"+photo.getDir()+"/"+photo.getUuid()+photo.getExt();
String filePathName=getServletContext().getRealPath(fileName);
File file=new File(filePathName);
if (file.exists()){
file.delete();
}
String showPath=getServletContext().getContextPath()+"/showServlet";
out.print("删除成功!<br/><a href='"+showPath+"'>浏览相册</a>");
} else {
out.print("相片删除失败<br/><a href='javascript:history.go(-1)'>返回</a>");
}
} else {
out.print("该文件不存在<br/><a href='javascript:history.go(-1)'>返回</a>");
}
}
}DAO层
PhotoDAO.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.utils.Dom4jFactory;
import cn.hncu.vo.PhotoModel;
public class PhotoDAO {
public boolean save(PhotoModel model){
Document dom=Dom4jFactory.getDom();
Element root=dom.getRootElement();
Element photoElement=root.addElement("photo");
photoElement.addAttribute("id", model.getUuid());
photoElement.addAttribute("ip", model.getIp());
photoElement.addAttribute("realName", model.getRealName());
photoElement.addAttribute("dir", model.getDir());
photoElement.addAttribute("ext", model.getExt());
photoElement.addAttribute("dateTime", model.getDateTime());
photoElement.addAttribute("description", model.getDescription());
boolean boo=Dom4jFactory.save();
return boo;
}
public List<PhotoModel> getAll(){
List<PhotoModel> list=new ArrayList<PhotoModel>();
Element root=Dom4jFactory.getDom().getRootElement();
Iterator<Element> it=root.elementIterator("photo");
while (it.hasNext()){
PhotoModel model=new PhotoModel();
Element e=it.next();
model.setDateTime(e.attributeValue("dateTime"));
model.setDir(e.attributeValue("dir"));
model.setExt(e.attributeValue("ext"));
model.setIp(e.attributeValue("ip"));
model.setRealName(e.attributeValue("realName"));
model.setUuid(e.attributeValue("id"));
model.setDescription(e.elementText("description"));
list.add(model);
}
return list;
}
public PhotoModel getSingleById(String uuid){
List<PhotoModel> list=getAll();
for (PhotoModel p:list){
if (p.getUuid().equals(uuid)){
return p;
}
}
return null;
}
public boolean delete(String id){
Document dom=Dom4jFactory.getDom();
Element e=(Element) dom.selectSingleNode("//photo[@id='"+id+"']");
return e.getParent().remove(e);
}
}工具类
MyUtils.java
package cn.hncu.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
public class MyUtils {
public static String getUuid(){
return UUID.randomUUID().toString().replace("-", "");
}
public static String getDir(String uuid){
String dir1=Integer.toHexString(uuid.hashCode() & 0xf);
String dir2=Integer.toHexString((uuid.hashCode() & 0xf0)>>4);
String dir=dir1+"/"+dir2;
return dir;
}
private static SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
public static String getCurrentTime(){
return format.format(new Date());
}
}Dom4jFactory.javapackage cn.hncu.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
public class MyUtils {
public static String getUuid(){
return UUID.randomUUID().toString().replace("-", "");
}
public static String getDir(String uuid){
String dir1=Integer.toHexString(uuid.hashCode() & 0xf);
String dir2=Integer.toHexString((uuid.hashCode() & 0xf0)>>4);
String dir=dir1+"/"+dir2;
return dir;
}
private static SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
public static String getCurrentTime(){
return format.format(new Date());
}
}
效果图：
主页：
上传照片：
浏览相册：
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 
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