java相册_精致小巧的java相册制作方法
本文實例為大家分享了java相冊制作方法，供大家參考，具體內容如下
注：
1)html上的圖片是靜態指定的。當更新了新的圖片時必須手工更新。所以使用Servlet讀取本地images中的所有圖片，動態顯示給用戶。
2)如果存在中文名的圖片，由于get方式無法直接傳遞中文，會導致出錯。
主頁面–index.jsp
小小相冊小小相冊
上傳相片
瀏覽相片
頁面顯示:
上傳圖片功能:
小小相冊小小相冊
照片:
說明:
package cn.hncu.servlet;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.RequestDispatcher;
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.PhotoDaoImpl;
import cn.hncu.domain.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");
PrintWriter out = response.getWriter();
out.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
A Servlet");out.println("
");out.print("錯誤信息:提交方式錯誤...不支持Get方式上傳照片");
out.println(" ");
out.println("");
out.flush();
out.close();
}
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();
out.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
上傳照片頁面");out.println("
");//從上傳表單提取信息:一,封裝成photo值對象,調用dao層存儲到后臺
// 二,把上傳的照片存儲到服務器硬盤
//數據庫:存儲照片的存儲情況的信息,,,真正的文件存儲到硬盤
DiskFileItemFactory dfi=new DiskFileItemFactory();
File file=new File("d:/a");
if(file.exists()){
file.mkdirs();
}
dfi.setRepository(file);
ServletFileUpload upload=new ServletFileUpload(dfi);
upload.setSizeMax(1024*1024*8);
upload.setHeaderEncoding("utf-8");//==>request.setCharacterEncoding("utf-8");
try {
List list=upload.parseRequest(request);
PhotoModel pm=new PhotoModel();
InputStream in=null;
for(FileItem fI:list){
if(fI.isFormField()){//這個不會有臨時文件
String desc=fI.getString("utf-8");
pm.setDesc(desc);
}else{
in=fI.getInputStream();
// String filename=fI.getFieldName();
// System.out.println("getFieldName:"+filename);
String fileName=fI.getName();
// System.out.println("getName:"+fileName);//測試:C:\Users\adl1\Pictures\Saved Pictures\111.jpg?
//衛條件
if(fileName==null||fileName.trim().equals("")){
out.println("沒有選擇文件,,,請必須選擇一個文件...
");
String strPath2=request.getContextPath()+"/jsps/upload.jsp";
out.println("返回上傳頁面");
return;
}
pm.setDt(MyUtils.getCurrentDataime());
String realName=fileName.substring(fileName.lastIndexOf("\\"));//"\112.jpg"
System.out.println(realName.substring(1, realName.length()));
pm.setRealName(realName.substring(1, realName.length()));//把realName的"\"去掉
//ext擴展名
String ext=fileName.substring(fileName.lastIndexOf("."));
pm.setExt(ext);
String id=MyUtils.getUUID();
pm.setId(id);
pm.setIp(request.getRemoteAddr());
pm.setDir(MyUtils.getDir(id));
}
}
//完成photo值對象的封裝,調用dao進行存儲
boolean boo=new PhotoDaoImpl().sava(pm);
if(boo){
//完成數據庫的存儲,接下來是服務器硬盤的存儲
//把照片存儲到項目根目錄下的photos文件夾中存儲(以打散方式存儲)
String path="photos/"+pm.getDir();
// System.out.println("path:"+path);//測試:photos/9/0
String filePath=getServletContext().getRealPath(path);
// System.out.println("filePath:"+filePath);//測試:D:\apache-tomcat-7.0.30\webapps\photosWeb\photos\9\0
File dir=new File(filePath);
if(!dir.exists()){
dir.mkdirs();
}
FileUtils.copyInputStreamToFile(in, new File(filePath+"/"+pm.getId()+pm.getExt()));
// //如果硬盤保存成功就跳轉到主頁面--轉發
RequestDispatcher rd=request.getRequestDispatcher(getServletContext().getContextPath()+"/index.jsp");//"/photosWeb/photosWeb/index.jsp"
// RequestDispatcher rd=request.getRequestDispatcher("/index.jsp");//"/photosWeb/index.jsp"g
// //java代碼塊和web.xml中url的開始"/"代表項目根目錄
// rd.forward(request, response);
//這里不能使用轉發,具體重定向和轉發區別:http://blog.csdn.net/xanlv/article/details/52701085
//重定向
response.sendRedirect(getServletContext().getContextPath()+"/index.jsp");
}else{
//數據庫保存失敗--留在上傳頁面
RequestDispatcher rd=request.getRequestDispatcher("/jsps/upload..jsp");//"/photosWeb/index.jsp"
rd.forward(request, response);
}
} catch (FileUploadException e) {
throw new RuntimeException("上傳失敗", e);
}finally{//清臨時文件
File f=new File("d:/a");
File fs[]=f.listFiles();
for(File ff:fs){
ff.delete();
}
}
out.println(" ");
out.println("");
out.flush();
out.close();
}
}
頁面顯示效果:
瀏覽圖片功能:
package cn.hncu.servlet;
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.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;
public class ShowAllImgServlet 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(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
相冊瀏覽");out.println("
");String strPath=request.getContextPath()+"/jsps/upload.jsp";
out.println("返回上傳頁面");
//String table="
String table="
"
文件名上傳日期時間相片相片說明操作";out.println(table);
//從dao層把所有的照片信息讀取出來發送到前端頁面
List list=new PhotoDaoImpl().getAllPhotos();
for(PhotoModel pm:list){
out.println("
");out.println("
"+pm.getRealName());out.println("
");out.println("
"+pm.getDt());out.println("
");String path=request.getContextPath()+"/photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
//System.out.println(path);//"/photosWeb/photos/d/7/e78e18352b42410f85dbd8df834bd718.jpg"
//點擊圖片可以查看大圖
out.println("
");out.println("
");out.println("
"+pm.getDesc());out.println("
");out.println("
刪除圖片");//out.println("下載圖片
");out.println("下載圖片");
out.println("
");}
out.println("
");out.println(" ");
out.println("");
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(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
A Servlet");out.println("
");out.print("不支持Post方式。。。");
out.println(" ");
out.println("");
out.flush();
out.close();
}
}
頁面顯示效果:
刪除功能:
package cn.hncu.servlet;
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.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;
public class DelPhotoServlet 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(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
刪除照片頁面");out.println("
");String id=request.getParameter("id");
String ip=request.getRemoteAddr();
PhotoDaoImpl dao=new PhotoDaoImpl();
PhotoModel pm=dao.getSingleById(id);
if(pm!=null){
if(!pm.getIp().equals(ip)){
out.println("您沒有該圖片的權限去刪除...");
String strPath=request.getContextPath()+"/servlet/showAllImg";
out.println("返回繼續瀏覽");
return ;
}
//刪除包含兩部分工作：清除數據庫中的信息 和 刪除服務器硬盤中的圖片文件
//1清除數據庫中的信息
boolean boo = dao.del(id);
//2刪除服務器硬盤中的圖片文件
if(boo){
String path="photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
String filePath=getServletContext().getRealPath(path);
File f=new File(filePath);
if(f.exists()){
f.delete();
}
String strPath=request.getContextPath()+"/servlet/showAllImg";
// System.out.println(strPath);///photosWeb/servlet/showPhotos
out.println("刪除成功...返回瀏覽");
}else{
out.println("刪除數據庫信息失敗");
}
}else{
out.println("文件不存在...");
String strPath=request.getContextPath()+"/servlet/showAllImg";
out.println("返回繼續瀏覽");
}
out.println(" ");
out.println("");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
刪除照片頁面");out.println("
");out.print("不支持POST方式...");
out.println(" ");
out.println("");
out.flush();
out.close();
}
}
頁面顯示:
下載功能:1.在HTML頁面上使用超連接指向要下載的文件(不安全容易被盜鏈)。
問題：
如何確定本地資源？
ServletContext – 代表一個web項目。一個web項目只有一個ServletContext對像。
getRealPath(“/”); //d:/prm/tom/web/
需求分析：在實際的開發中，下載哪一個文件，都是由用戶動態選擇的。
如，在我們項目images目錄下，存在著很多圖片文件。用戶在頁面上顯示所有圖片，用戶可以點下載連接下載喜歡的圖片。
詳細設計：
使用靜態網頁顯示所有圖片。給每一個圖片一個下以下載的超連接。
在超連接后面傳遞要下載的圖片id。
在serivice中動態接收圖片名。完成下載 。
package cn.hncu.servlet;
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.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FileUtils;
import cn.hncu.dao.PhotoDaoImpl;
import cn.hncu.domain.PhotoModel;
public class DownServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//獲取被下載圖片的信息
tring id=request.getParameter("id");
PhotoModel pm=new PhotoDaoImpl().getSingleById(id);
if(pm==null){
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
A Servlet");out.println("
");response.getWriter().println("alert('該文本已不存在...')");
out.println(" ");
out.println("");
out.flush();
out.close();
//getServletContext().getContextPath()
RequestDispatcher rd=request.getRequestDispatcher("/servlet/down");//"/photosWeb/index.jsp"
//java代碼塊和web.xml中url的開始"/"代表項目根目錄
rd.forward(request, response);
}else{
//真正下載: 把服務器硬盤的照片文件讀取出來發送給客戶端(設置響應頭)
//獲取真實的文件
String realName=pm.getRealName();
realName=URLEncoder.encode(realName, "utf-8");//如果是中文名必須轉碼，防止文件名中文亂碼
// InputStream in=DownServlet.class.getClassLoader().getResourceAsStream(realName);
//設置顯示類型為下載
response.setContentType("application/force-download");
//設置響應頭
response.setHeader("content-Disposition", "attachment;filename=\""+realName+"\"");
// String path=request.getContextPath()+"/photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
String path="photos/"+pm.getDir()+"/"+pm.getId()+pm.getExt();
String filePath=getServletContext().getRealPath(path);
FileUtils.copyInputStreamToFile(request.getInputStream(), new File(filePath));
InputStream in=new FileInputStream(filePath);
OutputStream o=response.getOutputStream();
byte b[]=new byte[1024];
int len=0;
while((len=in.read(b))!=-1){
o.write(b, 0, len);
}
o.close();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
A Servlet");out.println("
");out.print(" 不支持");
out.println(" ");
out.println("");
out.flush();
out.close();
}
}
頁面顯示效果:
配置文件web.xml
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
UploadServlet
cn.hncu.servlet.UploadServlet
ShowAllImgServlet
cn.hncu.servlet.ShowAllImgServlet
DownServlet
cn.hncu.servlet.DownServlet
DelPhotoServlet
cn.hncu.servlet.DelPhotoServlet
UploadServlet
/servlet/uploadServlet
ShowAllImgServlet
/servlet/showAllImg
DownServlet
/servlet/down
DelPhotoServlet
/servlet/delPhoto
index.jsp
數據庫:photos.xml
值對象:PhotoModel.java
package cn.hncu.domain;
public class PhotoModel {
//photo值對象
private String id;//UUID
private String realName;//照片真實文件名
private String ext;//擴展名
private String dir;//文件打撒后存儲的目錄
private String dt;//上傳日期時間
private String ip;//上傳客戶端的ip地址
private String desc;//照片說明
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 getDt() {
return dt;
}
public void setDt(String dt) {
this.dt = dt;
}
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public String Dreturn desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
}
dao層:這里簡寫了,只寫了實現類PhotoDaoImpl.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.domain.PhotoModel;
import cn.hncu.utils.DomFactory;
public class PhotoDaoImpl {
public boolean sava(PhotoModel pm){
Document dom=DomFactory.getDom();
Element root=dom.getRootElement();
Element e=root.addElement("photo");
e.addAttribute("id", pm.getId());
e.addAttribute("dir", pm.getDir());
e.addAttribute("dt", pm.getDt());
e.addAttribute("ext", pm.getExt());
e.addAttribute("ip", pm.getIp());
e.addAttribute("realName", pm.getRealName());
e.addElement("desc").setText(pm.getDesc());
boolean b=DomFactory.save();
if(b){
return true;
}
return false;
}
public List getAllPhotos(){
List li=new ArrayList();
Document dom=DomFactory.getDom();
Element e=dom.getRootElement();
Iterator it=e.elementIterator();
while(it.hasNext()){
Element ie=it.next();
PhotoModel pm=new PhotoModel();
pm.setId(ie.attributeValue("id"));
pm.setDir(ie.attributeValue("dir"));
pm.setDt(ie.attributeValue("dt"));
pm.setExt(ie.attributeValue("ext"));
pm.setIp(ie.attributeValue("ip"));
pm.setRealName(ie.attributeValue("realName"));
pm.setDesc(ie.elementText("desc"));
li.add(pm);
}
return li;
}
public PhotoModel getSingleById(String id){
List li=getAllPhotos();
PhotoModel pm=new PhotoModel();
for(PhotoModel p:li){
if(p.getId().equals(id)){
return p;
}
}
return null;
}
public boolean del(String id) {
Document dom=DomFactory.getDom();
Element e=(Element) dom.selectSingleNode("//photo[@id='"+id+"']");
return e.getParent().remove(e);
}
}
工具類:
1.
package cn.hncu.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
public class MyUtils {
private MyUtils() {
}
public static String getUUID(){
return UUID.randomUUID().toString().replace("-", "");
}
private static SimpleDateFormat sdf=new SimpleDateFormat("yy-MM-dd HH:mm:ss");
public static String getCurrentDataime(){
return sdf.format(new Date());
}
public static String getDir(String uuid){
String dir1=Integer.toHexString(uuid.hashCode()&0xf);
String dir2=Integer.toHexString((uuid.hashCode()&0xf0)>>4);
return dir1+"/"+dir2;
}
}
2.
package cn.hncu.utils;
import java.io.FileOutputStream;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class DomFactory {
private static Document dom;
private static String fileName;
static{
try {
SAXReader r=new SAXReader();
//獲取src下的資源文件
fileName=DomFactory.class.getClassLoader().getResource("photos.xml").getPath();
System.out.println("users.xml的路徑:"+fileName);//"/D:/apache-tomcat-7.0.30/webapps/photosWeb/WEB-INF/classes/photos.xml"
//注意:獲取tomcat中當前項目classpath下的資源方式
dom=r.read(fileName);
} catch (DocumentException e) {
e.printStackTrace();
}
}
public static Document getDom(){
return dom;
}
public static boolean save(){
XMLWriter w;
try {
w = new XMLWriter(new FileOutputStream(fileName));
w.write(dom);
w.close();
return true;
} catch (Exception e) {
return false;
}
}
}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
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