java上传下载

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使用common-fileupload组建实现文件上传下载功能, 封装了一个WebFileService的类 Java代码

[java] view plaincopy

1. import java.io.BufferedInputStream; 2. import java.io.BufferedOutputStream; 3. import java.io.File;

4. import java.io.FileInputStream; 5. import java.io.PrintWriter; 6. import java.net.URLEncoder; 7. import java.util.ArrayList; 8. import java.util.HashMap; 9. import java.util.Iterator; 10. import java.util.List; 11. import java.util.Map; 12.

13. import javax.servlet.http.HttpServletRequest; 14. import javax.servlet.http.HttpServletResponse; 15.

16. import org.apache.commons.fileupload.FileItem;

17. import org.apache.commons.fileupload.FileUploadException;

18. import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededExcepti

on;

19. import org.apache.commons.fileupload.disk.DiskFileItemFactory; 20. import org.apache.commons.fileupload.servlet.ServletFileUpload; 21. 22. /**

23. *

Title: 处理文件上传下载的类

24. *

Description:

25. * 通过设置long MAX_SIZE可以设置上传文件的大小 26. * 通过设置String[] allowedExt设置允许上传的文件类型 27. * 通过Map parameters获得表单域的信息

28. * 通过List fileInfoList获取上传的每个文件的详细信息 29. *

30. *

erved.

31. * @author royzhou 32. * 2009-02-20 33. */

34. public class FileWebService { 35. /**

36. * 表单域的信息 37. */

38. private Map parameters = null;

39. 40. /**

41. * 文件域的详细信息 42. */

43. private List fileInfoList = null; 44. 45. /**

46. * 允许上传的文件大小 47. */

48. private long MAX_SIZE = 10*1024*1024; 49. 50. /**

51. * 允许上传的文件类型 52. */

53. private String[] allowedExt = new String[] { \"jpg\", \"jpeg\", \"gif\", \"txt\"

,\"doc\", \"docx\", \"mp3\", \"wma\", \"m4a\" }; 54.

55. public FileWebService() { 56. parameters = new HashMap(); 57. fileInfoList = new ArrayList(); 58. } 59. 60. /**

61. * @param request 62. * @param response

63. * @param path 用户设置的保存路径 . * 上传文件并获取表单域及文件域的详细信息 65. * @throws Exception 66. */

67. public void upload(HttpServletRequest request, HttpServletResponse respo

nse, String path) throws Exception { 68. /**

69. * 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload 70. */

71. DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

72. diskFileItemFactory.setSizeThreshold(4096);// 设置上传文件时用于临时存

放文件的内存大小,这里是4K.多于的部分将临时存在硬盘 73. /**

74. * 采用系统临时文件目录作为上传的临时目录 75. */

76. File tempfile = new File(System.getProperty(\"java.io.tmpdir\"));

77. diskFileItemFactory.setRepository(tempfile);

78. 79. /**

80. * 用以上工厂实例化上传组件 81. * 设置最大上传尺寸 82. */

83. ServletFileUpload fileUpload = new ServletFileUpload(diskFileItemFac

tory);

84. fileUpload.setSizeMax(MAX_SIZE); 85. 86. /**

87. * 调用FileUpload.settingHeaderEncoding(”UTF-8″)，这项设置可以解决路径

或者文件名为乱码的问题。 88. * 设置输出字符集 . */

90. fileUpload.setHeaderEncoding(\"UTF-8\");

91. response.setContentType(\"text/html;charset=utf-8\"); 92.

93. PrintWriter out = response.getWriter(); 94. /**

95. * 从request得到所有上传域的列表 96. */

97. List fileList = null; 98. try {

99. fileList = fileUpload.parseRequest(request); 100. } catch (FileUploadException e) {

101. if (e instanceof SizeLimitExceededException) { 102. /**

103. * 文件大小超出 104. */

105. out.println(\"文件尺寸超过规定大小:\" + MAX_SIZE + \"字节

\");

106. out.println(\"返回

\");

107. return; 108. }

109. e.printStackTrace(); 110. } 111. /**

112. * 没有上传文件 113. */

114. if (fileList == null || fileList.size() == 0) { 115. out.println(\"请选择上传文件

\");

116. out.println(\"返回

\");

117. return; 118. } 119. /**

120. * 得到所有上传的文件 121. * 对文件域操作

122. * 并保存每个文件的详细信息 123. */

124. Iterator fileItr = fileList.iterator(); 125. Map fileInfo = null; 126. while (fileItr.hasNext()) { 127. FileItem fileItem = null; 128. long size = 0;

129. String userPath = null; 130. String serverPath = null; 131. String fileName = null; 132. String fileExt = null;

133. fileItem = (FileItem) fileItr.next(); 134. /**

135. * 忽略简单form字段而不是上传域的文件域(

等)

136. */

137. if (!fileItem.isFormField()) { 138. 139. /**

140. * 得到文件的详细信息 141. * 客户端完整路径：userPath 142. * 服务器端完整路径：serverPath 143. * 大小：size 144. * 文件名：fileName 145. * 扩展名：fileExt 146. * 147. */

148. userPath = fileItem.getName(); 149. size = fileItem.getSize();

150. if (\"\".equals(userPath) || size == 0) { 151. out.println(\"请选择上传文件

\");

152. out.println(\"返

回\");

153. return; 154. }

155. fileName = userPath.substring(userPath.lastIndexOf(\"\\\\\") +

1);

156. fileExt = fileName.substring(fileName.lastIndexOf(\".\") + 1)

;

157.

158. /**

159. * 文件类型是否合法 160. */

161. int allowFlag = 0;

162. int allowedExtCount = allowedExt.length;

163. for (; allowFlag < allowedExtCount; allowFlag++) { 1. if (allowedExt[allowFlag].toLowerCase().equals(fileExt.

toLowerCase()))

165. break; 166. }

167. if (allowFlag == allowedExtCount) {

168. out.println(\"请上传以下类型的文件

\");

169. for (allowFlag = 0; allowFlag < allowedExtCount; allowF

lag++)

170. out.println(\"*.\" + allowedExt[allowFlag].toLowerCas

e()

171. + \" \"); 172. out

173. .println(\"

\"_top\\\">返回\");

174. return; 175. } 176. /**

177. * 根据系统时间生成上传后保存的文件名 178. */

179. serverPath = path + System.currentTimeMillis() + \".\" + file

Ext;

180. 181. try { 182. /**

183. * 保存文件 184. */

185. File diskPath = new File(path); 186. if(!diskPath.exists()) { 187. diskPath.mkdirs(); 188. }

1. File diskFile = new File(serverPath); 190. if(!diskFile.exists()) { 191. diskFile.createNewFile(); 192. }

193. fileItem.write(diskFile);

194. out.println(\"文件上传成功. 已保存为: \" + serverPath 195. + \" 文件大小: \" + size + \"字节

\");

196. out.println(\"

\"); 201. } catch (Exception e) { 202. e.printStackTrace(); 203. } 204.

205. fileInfo = new HashMap();

206. fileInfo.put(\"size\", String.valueOf(size)); 207. fileInfo.put(\"userpath\", userPath); 208. fileInfo.put(\"name\",fileName); 209. fileInfo.put(\"ext\", fileExt);

210. fileInfo.put(\"serverpath\", serverPath); 211. fileInfoList.add(fileInfo); 212. } else {

213. String fieldName = fileItem.getFieldName(); 214. /**

215. * 在取字段值的时候，用FileItem.getString(”UTF-8″)，这项设置可

以解决获取的表单字段为乱码的问题。 216. */

217. String value = fileItem.getString(\"UTF-8\"); 218. parameters.put(fieldName, value); 219. } 220. } 221. } 222. 223. 224. /**

225. * 该方法支持支持国际化 226. * 但是文件名不能超过17个汉字 227. * 而且在IE6下存在bug 228. */

229. public void downloadI18N(HttpServletRequest request, HttpServletRespons

e response) throws Exception {

230. response.setContentType(\"text/html;charset=utf-8\"); 231. java.io.BufferedInputStream bis = null; 232. java.io.BufferedOutputStream bos = null; 233.

234. String filePath = request.getParameter(\"filePath\"); 235. String fileName = request.getParameter(\"fileName\"); 236. System.out.println(fileName); 237. try {

238. long fileLength = new File(filePath).length(); 239.

240. fileName = URLEncoder.encode(fileName, \"UTF-8\"); 241. response.setContentType(\"application/x-msdownload;\"); 242. response.setHeader(\"Content-disposition\", \"attachment; filename

=\" + fileName);

243. response.setHeader(\"Content-Length\", String.valueOf(fileLength)

); 244.

245. bis = new BufferedInputStream(new FileInputStream(filePath));

246. bos = new BufferedOutputStream(response.getOutputStream());

247. byte[] buff = new byte[2048]; 248. int bytesRead;

249. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

250. bos.write(buff, 0, bytesRead); 251. }

252. } catch (Exception e) { 253. e.printStackTrace(); 254. } finally {

255. if (bis != null) 256. bis.close(); 257. if (bos != null) 258. bos.close(); 259. } 260. } 261. 262. /**

263. * 支持中文,文件名长度无 2. * 不支持国际化 265. */

266. public void download(HttpServletRequest request, HttpServletResponse re

sponse) throws Exception {

267. response.setContentType(\"text/html;charset=utf-8\"); 268. request.setCharacterEncoding(\"UTF-8\"); 269. java.io.BufferedInputStream bis = null; 270. java.io.BufferedOutputStream bos = null; 271.

272. String filePath = request.getParameter(\"filePath\"); 273. String fileName = request.getParameter(\"fileName\"); 274. System.out.println(fileName); 275. try {

276. long fileLength = new File(filePath).length(); 277.

278. response.setContentType(\"application/x-msdownload;\"); 279. response.setHeader(\"Content-disposition\", \"attachment; filename

=\" + new String(fileName.getBytes(\"GBK\"),\"ISO8859-1\"));

280. response.setHeader(\"Content-Length\", String.valueOf(fileLength)

); 281.

282. bis = new BufferedInputStream(new FileInputStream(filePath));

283. bos = new BufferedOutputStream(response.getOutputStream());

284. byte[] buff = new byte[2048]; 285. int bytesRead;

286. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

287. bos.write(buff, 0, bytesRead); 288. }

2. } catch (Exception e) { 290. e.printStackTrace(); 291. } finally {

292. if (bis != null) 293. bis.close(); 294. if (bos != null) 295. bos.close(); 296. } 297. } 298.

299. public List getFileInfoList() { 300. return fileInfoList; 301. } 302.

303. public void setFileInfoList(List fileInfoList) { 304. this.fileInfoList = fileInfoList; 305. } 306.

307. public Map getParameters() { 308. return parameters; 309. } 310.

311. public void setParameters(Map parameters) { 312. this.parameters = parameters; 313. } 314.

315. public String[] getAllowedExt() { 316. return allowedExt; 317. } 318.

319. public void setAllowedExt(String[] allowedExt) { 320. this.allowedExt = allowedExt; 321. } 322.

323. public long getMAX_SIZE() { 324. return MAX_SIZE; 325. } 326.

327. public void setMAX_SIZE(long max_size) { 328. MAX_SIZE = max_size; 329. } 330. }

[java] view plaincopy

1. import java.io.BufferedInputStream; 2. import java.io.BufferedOutputStream; 3. import java.io.File;

13. import javax.servlet.http.HttpServletRequest; 14. import javax.servlet.http.HttpServletResponse; 15.

16. import org.apache.commons.fileupload.FileItem;

17. import org.apache.commons.fileupload.FileUploadException;

18. import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededExcepti

on;

19. import org.apache.commons.fileupload.disk.DiskFileItemFactory; 20. import org.apache.commons.fileupload.servlet.ServletFileUpload; 21.

22. /**

23. *

Title: 处理文件上传下载的类

24. *

Description:

25. * 通过设置long MAX_SIZE可以设置上传文件的大小 26. * 通过设置String[] allowedExt设置允许上传的文件类型 27. * 通过Map parameters获得表单域的信息

28. * 通过List fileInfoList获取上传的每个文件的详细信息 29. *

30. *

erved.

31. * @author royzhou 32. * 2009-02-20 33. */

34. public class FileWebService { 35. /**

36. * 表单域的信息 37. */

38. private Map parameters = null; 39. 40. /**

41. * 文件域的详细信息 42. */

43. private List fileInfoList = null; 44. 45. /**

46. * 允许上传的文件大小 47. */

48. private long MAX_SIZE = 10*1024*1024; 49. 50. /**

51. * 允许上传的文件类型 52. */

53. private String[] allowedExt = new String[] { \"jpg\", \"jpeg\", \"gif\", \"txt\"

,\"doc\", \"docx\", \"mp3\", \"wma\", \"m4a\" }; 54.

55. public FileWebService() { 56. parameters = new HashMap(); 57. fileInfoList = new ArrayList(); 58. } 59. 60. /**

61. * @param request 62. * @param response

63. * @param path 用户设置的保存路径

. * 上传文件并获取表单域及文件域的详细信息 65. * @throws Exception 66. */

67. public void upload(HttpServletRequest request, HttpServletResponse respo

nse, String path) throws Exception { 68. /**

69. * 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload 70. */

71. DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

72. diskFileItemFactory.setSizeThreshold(4096);// 设置上传文件时用于临时存

放文件的内存大小,这里是4K.多于的部分将临时存在硬盘 73. /**

74. * 采用系统临时文件目录作为上传的临时目录 75. */

76. File tempfile = new File(System.getProperty(\"java.io.tmpdir\"));

77. diskFileItemFactory.setRepository(tempfile); 78. 79. /**

80. * 用以上工厂实例化上传组件 81. * 设置最大上传尺寸 82. */

83. ServletFileUpload fileUpload = new ServletFileUpload(diskFileItemFac

tory);

84. fileUpload.setSizeMax(MAX_SIZE); 85. 86. /**

87. * 调用FileUpload.settingHeaderEncoding(”UTF-8″)，这项设置可以解决路径

或者文件名为乱码的问题。 88. * 设置输出字符集 . */

90. fileUpload.setHeaderEncoding(\"UTF-8\");

91. response.setContentType(\"text/html;charset=utf-8\"); 92.

93. PrintWriter out = response.getWriter(); 94. /**

95. * 从request得到所有上传域的列表 96. */

97. List fileList = null; 98. try {

99. fileList = fileUpload.parseRequest(request); 100. } catch (FileUploadException e) {

101. if (e instanceof SizeLimitExceededException) {

102. /**

103. * 文件大小超出 104. */

105. out.println(\"文件尺寸超过规定大小:\" + MAX_SIZE + \"字节

\");

106. out.println(\"返回

\");

107. return; 108. }

109. e.printStackTrace(); 110. } 111. /**

112. * 没有上传文件 113. */

114. if (fileList == null || fileList.size() == 0) { 115. out.println(\"请选择上传文件

\");

116. out.println(\"返回

\");

117. return; 118. } 119. /**

120. * 得到所有上传的文件 121. * 对文件域操作

122. * 并保存每个文件的详细信息 123. */

124. Iterator fileItr = fileList.iterator(); 125. Map fileInfo = null; 126. while (fileItr.hasNext()) { 127. FileItem fileItem = null; 128. long size = 0;

129. String userPath = null; 130. String serverPath = null; 131. String fileName = null; 132. String fileExt = null;

133. fileItem = (FileItem) fileItr.next(); 134. /**

135. * 忽略简单form字段而不是上传域的文件域(

等)

136. */

137. if (!fileItem.isFormField()) { 138. 139. /**

140. * 得到文件的详细信息 141. * 客户端完整路径：userPath

142. * 服务器端完整路径：serverPath 143. * 大小：size 144. * 文件名：fileName 145. * 扩展名：fileExt 146. * 147. */

148. userPath = fileItem.getName(); 149. size = fileItem.getSize();

150. if (\"\".equals(userPath) || size == 0) { 151. out.println(\"请选择上传文件

\");

152. out.println(\"返

回\");

153. return; 154. }

155. fileName = userPath.substring(userPath.lastIndexOf(\"\\\\\") +

1);

156. fileExt = fileName.substring(fileName.lastIndexOf(\".\") + 1)

; 157.

158. /**

159. * 文件类型是否合法 160. */

161. int allowFlag = 0;

162. int allowedExtCount = allowedExt.length;

163. for (; allowFlag < allowedExtCount; allowFlag++) { 1. if (allowedExt[allowFlag].toLowerCase().equals(fileExt.

toLowerCase()))

165. break; 166. }

167. if (allowFlag == allowedExtCount) {

168. out.println(\"请上传以下类型的文件

\");

169. for (allowFlag = 0; allowFlag < allowedExtCount; allowF

lag++)

170. out.println(\"*.\" + allowedExt[allowFlag].toLowerCas

e()

171. + \" \"); 172. out

173. .println(\"

\"_top\\\">返回\");

174. return; 175. } 176. /**

177. * 根据系统时间生成上传后保存的文件名 178. */

179. serverPath = path + System.currentTimeMillis() + \".\" + file

Ext;

180. 181. try { 182. /**

183. * 保存文件 184. */

185. File diskPath = new File(path); 186. if(!diskPath.exists()) { 187. diskPath.mkdirs(); 188. }

1. File diskFile = new File(serverPath); 190. if(!diskFile.exists()) { 191. diskFile.createNewFile(); 192. }

193. fileItem.write(diskFile);

194. out.println(\"文件上传成功. 已保存为: \" + serverPath 195. + \" 文件大小: \" + size + \"字节

\"); 196. out.println(\"

\"); 201. } catch (Exception e) { 202. e.printStackTrace(); 203. } 204.

205. fileInfo = new HashMap();

206. fileInfo.put(\"size\", String.valueOf(size)); 207. fileInfo.put(\"userpath\", userPath); 208. fileInfo.put(\"name\",fileName); 209. fileInfo.put(\"ext\", fileExt);

210. fileInfo.put(\"serverpath\", serverPath); 211. fileInfoList.add(fileInfo); 212. } else {

213. String fieldName = fileItem.getFieldName(); 214. /**

215. * 在取字段值的时候，用FileItem.getString(”UTF-8″)，这项设置可

以解决获取的表单字段为乱码的问题。 216. */

217. String value = fileItem.getString(\"UTF-8\"); 218. parameters.put(fieldName, value); 219. } 220. } 221. } 222. 223. 224. /**

225. * 该方法支持支持国际化 226. * 但是文件名不能超过17个汉字 227. * 而且在IE6下存在bug 228. */

229. public void downloadI18N(HttpServletRequest request, HttpServletRespons

e response) throws Exception {

230. response.setContentType(\"text/html;charset=utf-8\"); 231. java.io.BufferedInputStream bis = null; 232. java.io.BufferedOutputStream bos = null; 233.

234. String filePath = request.getParameter(\"filePath\"); 235. String fileName = request.getParameter(\"fileName\"); 236. System.out.println(fileName); 237. try {

238. long fileLength = new File(filePath).length(); 239.

240. fileName = URLEncoder.encode(fileName, \"UTF-8\"); 241. response.setContentType(\"application/x-msdownload;\"); 242. response.setHeader(\"Content-disposition\", \"attachment; filename

=\" + fileName);

243. response.setHeader(\"Content-Length\", String.valueOf(fileLength)

); 244.

245. bis = new BufferedInputStream(new FileInputStream(filePath));

246. bos = new BufferedOutputStream(response.getOutputStream());

247. byte[] buff = new byte[2048]; 248. int bytesRead;

249. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

250. bos.write(buff, 0, bytesRead); 251. }

252. } catch (Exception e) { 253. e.printStackTrace(); 254. } finally {

255. if (bis != null) 256. bis.close(); 257. if (bos != null) 258. bos.close(); 259. } 260. } 261. 262. /**

263. * 支持中文,文件名长度无 2. * 不支持国际化 265. */

266. public void download(HttpServletRequest request, HttpServletResponse re

sponse) throws Exception {

272. String filePath = request.getParameter(\"filePath\"); 273. String fileName = request.getParameter(\"fileName\"); 274. System.out.println(fileName); 275. try {

276. long fileLength = new File(filePath).length(); 277.

278. response.setContentType(\"application/x-msdownload;\"); 279. response.setHeader(\"Content-disposition\", \"attachment; filename

=\" + new String(fileName.getBytes(\"GBK\"),\"ISO8859-1\"));

280. response.setHeader(\"Content-Length\", String.valueOf(fileLength)

); 281.

282. bis = new BufferedInputStream(new FileInputStream(filePath));

283. bos = new BufferedOutputStream(response.getOutputStream());

284. byte[] buff = new byte[2048]; 285. int bytesRead;

286. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

287. bos.write(buff, 0, bytesRead); 288. }

2. } catch (Exception e) { 290. e.printStackTrace(); 291. } finally {

292. if (bis != null)

293. bis.close(); 294. if (bos != null) 295. bos.close(); 296. } 297. } 298.