|
1
16
17 package org.springframework.web.multipart.commons;
18
19 import java.io.ByteArrayInputStream  ;
20 import java.io.File ;
21 import java.io.IOException ;
22 import java.io.InputStream ;
23 import java.io.Serializable ;
24
25 import org.apache.commons.fileupload.FileItem;
26 import org.apache.commons.fileupload.FileUploadException;
27 import org.apache.commons.fileupload.disk.DiskFileItem;
28 import org.apache.commons.logging.Log;
29 import org.apache.commons.logging.LogFactory;
30
31 import org.springframework.web.multipart.MultipartFile;
32
33
45 public class CommonsMultipartFile implements MultipartFile, Serializable {
46
47 protected static final Log logger = LogFactory.getLog(CommonsMultipartFile.class);
48
49 private final FileItem fileItem;
50
51 private final long size;
52
53
54
58 public CommonsMultipartFile(FileItem fileItem) {
59 this.fileItem = fileItem;
60 this.size = this.fileItem.getSize();
61 }
62
63
67 public final FileItem getFileItem() {
68 return this.fileItem;
69 }
70
71
72 public String getName() {
73 return this.fileItem.getFieldName();
74 }
75
76 public String getOriginalFilename() {
77 String filename = this.fileItem.getName();
78 if (filename == null) {
79 return "";
81 }
82 int pos = filename.lastIndexOf("/");
84 if (pos == -1) {
85 pos = filename.lastIndexOf("\\");
87 }
88 if (pos != -1) {
89 return filename.substring(pos + 1);
91 }
92 else {
93 return filename;
95 }
96 }
97
98 public String getContentType() {
99 return this.fileItem.getContentType();
100 }
101
102 public boolean isEmpty() {
103 return (this.size == 0);
104 }
105
106 public long getSize() {
107 return this.size;
108 }
109
110 public byte[] getBytes() {
111 if (!isAvailable()) {
112 throw new IllegalStateException ("File has been moved - cannot be read again");
113 }
114 byte[] bytes = this.fileItem.get();
115 return (bytes != null ? bytes : new byte[0]);
116 }
117
118 public InputStream getInputStream() throws IOException {
119 if (!isAvailable()) {
120 throw new IllegalStateException ("File has been moved - cannot be read again");
121 }
122 InputStream inputStream = this.fileItem.getInputStream();
123 return (inputStream != null ? inputStream : new ByteArrayInputStream (new byte[0]));
124 }
125
126 public void transferTo(File dest) throws IOException , IllegalStateException {
127 if (!isAvailable()) {
128 throw new IllegalStateException ("File has already been moved - cannot be transferred again");
129 }
130
131 if (dest.exists() && !dest.delete()) {
132 throw new IOException (
133 "Destination file [" + dest.getAbsolutePath() + "] already exists and could not be deleted");
134 }
135
136 try {
137 this.fileItem.write(dest);
138 if (logger.isDebugEnabled()) {
139 String action = "transferred";
140 if (!this.fileItem.isInMemory()) {
141 action = isAvailable() ? "copied" : "moved";
142 }
143 logger.debug("Multipart file '" + getName() + "' with original filename [" +
144 getOriginalFilename() + "], stored " + getStorageDescription() + ": " +
145 action + " to [" + dest.getAbsolutePath() + "]");
146 }
147 }
148 catch (FileUploadException ex) {
149 throw new IllegalStateException (ex.getMessage());
150 }
151 catch (IOException ex) {
152 throw ex;
153 }
154 catch (Exception ex) {
155 logger.error("Could not transfer to file", ex);
156 throw new IOException ("Could not transfer to file: " + ex.getMessage());
157 }
158 }
159
160
164 protected boolean isAvailable() {
165 if (this.fileItem.isInMemory()) {
167 return true;
168 }
169 if (this.fileItem instanceof DiskFileItem) {
171 return ((DiskFileItem) this.fileItem).getStoreLocation().exists();
172 }
173 return (this.fileItem.getSize() == this.size);
175 }
176
177
182 public String getStorageDescription() {
183 if (this.fileItem.isInMemory()) {
184 return "in memory";
185 }
186 else if (this.fileItem instanceof DiskFileItem) {
187 return "at [" + ((DiskFileItem) this.fileItem).getStoreLocation().getAbsolutePath() + "]";
188 }
189 else {
190 return "on disk";
191 }
192 }
193
194 }
195 |
Popular Tags |
Java API By Example, From Geeks To Geeks.