ImageSessionFilter


1   /**
2    * Copyright 2003-2006 the original author or authors.
3    * Licensed under the Apache License, Version 2.0 (the "License");
4    * you may not use this file except in compliance with the License.
5    * You may obtain a copy of the License at
6   
7          http://www.apache.org/licenses/LICENSE-2.0
8   
9     * Unless required by applicable law or agreed to in writing, software
10    * distributed under the License is distributed on an "AS IS" BASIS,
11    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12    * See the License for the specific language governing permissions and
13    * limitations under the License.
14    */
15  
16  package com.jdon.strutsutil.file.filter;
17  
18  import com.jdon.strutsutil.file.*;
19  import javax.servlet.http.*;
20  import java.util.*;
21  import com.jdon.util.Debug;
22  import com.jdon.util.UtilValidate;
23  
24  public class ImageSessionFilter implements ImageFilter {
25  
26    public final static String   module = ImageSessionFilter.class.getName();
27  
28    private final static String   PIC_NAME_PACKAGE = "PicturesPakage";
29  
30    private ImageFilter imageFilter = null;
31  
32    public ImageSessionFilter(ImageFilter imageFilter) {
33      this.imageFilter = imageFilter;
34  
35    }
36  
37    /**
38     * 有些功能直接�?作ImageSessionFilter()为止
39     */
40    public ImageSessionFilter() {
41    }
42  
43    /**
44     * 将HttpSession中的ID集�?�和�?的imageFilterID集�?��?�并
45     *
46     * �?�?�?个ID�?�有一个。
47     *
48     * @param request
49     * @return
50     */
51    public Collection getUploadFileID(HttpServletRequest request) {
52      Collection set = null;
53      Debug.logVerbose("[JdonFramework]--> enter session filter ", module);
54      try {
55         //�?�?一个id�?�有一个
56  
57        //从下一个Filter�?�出ID集�?�，没有�?�?
58        Collection list = imageFilter.getUploadFileID(request);
59        if (list == null)
60          set = new LinkedHashSet();
61        else
62          set = new LinkedHashSet(list);
63  
64        HttpSession session = request.getSession();
65        Collection sessionList = (Collection) session.getAttribute(PIC_NAME_PACKAGE);
66        if (sessionList == null) return set;
67  
68        //确�?Session中的ID覆盖下一个Filter中ID
69        Iterator  iter = sessionList.iterator();
70        while (iter.hasNext()) {
71          UploadFile uploadFile = (UploadFile) iter.next();
72          if ( (uploadFile.getId() != null) && (!uploadFile.getId().equals(""))) {
73            set.add(uploadFile.getId());
74          } else { //如果Session有多于下一个Filter的ID，以排列TempId加入
75            set.add(uploadFile.getTempId());
76          }
77        }
78      } catch (Exception   ex) {
79        Debug.logError("[JdonFramework] getUploadFileID error" + ex, module);
80      }
81      return set;
82  
83    }
84  
85    /**
86     * 根�?�UploadFile的id获得UploadFile实例
87     * @param request
88     * @param id
89     * @return
90     */
91    public UploadFile getUploadFile(HttpServletRequest request, String   id) {
92      UploadFile uploadFile = null;
93      Debug.logVerbose("[JdonFramework]--> getUploadFile session filter id=" + id, module);
94      try {
95        uploadFile = getUploadFileFromSession(request, id);
96        if (uploadFile == null) {
97          uploadFile = imageFilter.getUploadFile(request, id);
98        }
99      } catch (Exception   ex) {
100       Debug.logWarning(" getUploadFile error" + ex, module);
101 
102     }
103     return uploadFile;
104   }
105 
106   /**
107    * 根�?�UploadFile的id删除UploadFile实例
108    * @param request
109    * @param id
110    */
111   public void deleteUploadFile(HttpServletRequest request,
112                                UploadFile uploadFile) {
113     try {
114       String   imageId = null;
115       //首先先删除Session
116      if (!UtilValidate.isEmpty(uploadFile.getTempId())) {
117         imageId = uploadFile.getTempId();
118         deleteUploadFileFromSession(request, imageId);
119       }else  if (!UtilValidate.isEmpty(uploadFile.getId())) {
120        imageId = uploadFile.getId();
121        deleteUploadFileFromSession(request, imageId);
122        imageFilter.deleteUploadFile(request, uploadFile);
123       } else
124         throw new Exception  ("parameter id  and tempId all is null");
125 
126     } catch (Exception   ex) {
127       Debug.logError("[JdonFramework] deleteUploadFile error:" + ex, module);
128     }
129 
130   }
131 
132   /**
133    * �?个UploadFile新增�?存到Http Session
134    * @param request
135    * @param uploadFile
136    */
137   public void addUploadFile(HttpServletRequest request,
138                             UploadFile uploadFile) {
139     if (uploadFile == null)
140       return;
141     try{
142       HttpSession session = request.getSession(true);
143       Collection uploadList = (Collection)session.getAttribute(PIC_NAME_PACKAGE);
144       if (uploadList == null) {
145         uploadList = new ArrayList();
146         session.setAttribute(PIC_NAME_PACKAGE, uploadList);
147       }
148       uploadList.add(uploadFile);
149       uploadFile.setTempId(Integer.toString(uploadList.size() - 1)); //临时给予id
150     }catch(Exception   ex){
151       Debug.logError("[JdonFramework]addUploadFile error:" + ex, module);
152     }
153 
154   }
155 
156   /**
157    * 一次性将之�?�?存的所有UploadFile集�?��?�出，然�?�从Session中删除
158    *
159    * 获得�?一个步骤上传的数�?�
160    *
161    * 文件上传是在专门页�?��?作，�?作�?功�?�，其它页�?�通过本方法获得数�?�。
162    *
163    * @param request
164    * @return UploadFile 集�?�
165    */
166   public Collection loadAllUploadFile(HttpServletRequest request) {
167     Debug.logVerbose("[JdonFramework] load all upload files from session and remove them", module);
168     Collection uploadList = null;
169     try {
170       HttpSession session = request.getSession();
171       if (session != null) {
172         uploadList = (Collection) session.getAttribute(PIC_NAME_PACKAGE);
173         session.removeAttribute(PIC_NAME_PACKAGE);
174       }
175     } catch (Exception   ex) {
176       Debug.logError("[JdonFramework] not found the upload files in session" + ex, module);
177     }
178     return uploadList;
179   }
180 
181   /**
182    * �?�出�?存的所有UploadFile集�?�，但�?从Session删除这些集�?�
183    * @param request
184    * @return
185    */
186   public Collection getAllUploadFile(HttpServletRequest request) {
187 
188     Collection uploadList = null;
189     try {
190       HttpSession session = request.getSession();
191       if (session != null) {
192         uploadList = (Collection) session.getAttribute(PIC_NAME_PACKAGE);
193       }
194     } catch (Exception   ex) {
195       Debug.logError("[JdonFramework] not found the upload files in session" + ex, module);
196     }
197     return uploadList;
198   }
199 
200 
201   /**
202    * 根�?�UploadFile的id获得UploadFile实例
203    * @param request
204    * @param id
205    * @return
206    */
207   private UploadFile getUploadFileFromSession(HttpServletRequest request,
208                                               String   id) {
209     UploadFile uploadFile = null;
210     boolean found = false;
211     try {
212       HttpSession session = request.getSession(true);
213       Collection uploadList = (Collection) session.getAttribute(PIC_NAME_PACKAGE);
214       if (uploadList == null)
215         return null;
216       Iterator iter = uploadList.iterator();
217       while (iter.hasNext()) {
218         uploadFile = (UploadFile) iter.next();
219         if (uploadFile.getId().equals(id)){
220           found = true;
221           break;
222         }else if (uploadFile.getTempId().equals(id)){
223           found = true;
224           break;
225         }
226       }
227       if (!found )  uploadFile = null;
228     } catch (Exception   ex) {
229       Debug.logError("[JdonFramework] getUploadFileSession error" + ex, module);
230 
231     }
232     return uploadFile;
233 
234   }
235 
236   /**
237    * 删除图片
238    * @param request
239    * @param uploadFile
240    */
241   private void deleteUploadFileFromSession(HttpServletRequest request,
242                                            String   id) {
243     try {
244 
245       HttpSession session = request.getSession(true);
246       Collection uploadList = (Collection) session.getAttribute(PIC_NAME_PACKAGE);
247       if ( (uploadList == null) || (id == null))
248         return;
249 
250       UploadFile uploadFile = null;
251       boolean found = false;
252       Iterator iter = uploadList.iterator();
253       while (iter.hasNext()) {
254         Object   o = iter.next();
255         Debug.logError("[JdonFramework] object: " + o.getClass().getName(), module);
256         uploadFile = (UploadFile) o;
257         if (uploadFile.getId().equals(id)){
258           found = true;
259           break;
260         }else if (uploadFile.getTempId().equals(id)){
261           found = true;
262           break;
263         }
264       }
265       if (found )
266         uploadList.remove(uploadFile);
267     } catch (Exception   ex) {
268       Debug.logError("[JdonFramework] deleteUploadFileFromSession error" + ex, module);
269 
270     }
271 
272   }
273 
274 }
275
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