1.前言。 properties文件的写作方法比较难用，折中写了一个通用类。2.例子。
1. import2. import3. import4. import5. import6. import7. import8. import9. import10. import11. import12. 13. /**14. * 阅读Properties综合类15. * 16. * @author lijn 2014-02-2517. */18. public class19. /**20. * 获得某一类的路径21. * 22. * @param name23. * @return24. */25. public static26. null; 27. if (System.getProperty("os.name").toLowerCase().indexOf("window") > -1) { 28. "/").toString().replace("file:/", "") 29. "%20", " "); 30. else31. "/").toString().replace("file:", "") 32. "%20", " "); 33. } 34. return35. } 36. 37. /**38. * 阅读所有property39. * 40. * @param filename4. * properties文件路径422. * @return Property的所有集合(map形式)43. */44. @SuppressWarnings("unchecked") 45. public static46. if (null47. return null; 48. } 49. class) + filename; 50. new51. null; 52. try53. new BufferedInputStream(new54. props.load(in); 55. new56. Enumeration en = props.propertyNames(); 57. while58. String key = (String) en.nextElement(); 59. String Property = props.getProperty(key); 60. map.put(key, Property); 61. } 62. return63. // 关闭资源64. catch65. e.printStackTrace(); 66. catch67. e.printStackTrace(); 68. finally69. try70. in.close(); 71. catch72. // TODO Auto-generated catch block73. e.printStackTrace(); 74. } 75. } 76. return null; 77. } 78. 79. /**80. * 获得一个property的值81. * 82. * @param filename83. * 文件名84. * @param key85. * propertykey86. * @return propertyvalue87. */88. public static89. if (null == filename || null90. return null; 91. } 92. class) + filename; 93. new94. null; 95. null; 96. try97. new BufferedInputStream(new98. props.load(in); 99. new FileOutputStream(new100. props.setProperty(key, value); 101. "update"); 102. // 关闭资源103. catch104. e.printStackTrace(); 105. catch106. e.printStackTrace(); 107. finally108. try109. out.close(); 110. in.close(); 111. catch112. // TODO Auto-generated catch block113. e.printStackTrace(); 114. } 115. } 116. return null; 117. } 118. 119. /**120. * 获得property的值121. * 122. * @param filename123. * 文件名124. * @param key125. * propertykey126. * @return propertyvalue127. */128. public static129. if (null == filename || null130. return null; 131. } 132. class) + filename; 133. new134. null; 135. try136. new BufferedInputStream(new137. props.load(in); 138. return139. // 关闭资源140. catch141. e.printStackTrace(); 142. catch143. e.printStackTrace(); 144. finally145. try146. in.close(); 147. catch148. // TODO Auto-generated catch block149. e.printStackTrace(); 150. } 151. } 152. return null; 153. } 154. 155. /**156. * config需要使用.properies文件放在以下157. * 158. * @param filename159. * @param key160. * @param value161. * @return162. */163. public static164. if (null == filename || null165. return null; 166. } 167. class) + filename; 168. new169. null; 170. null; 171. try172. class.getResourceAsStream("config.properties"); 173. // System.out.println(PropertiesUtil.class.getClassLoader().getResource("config.properties"));174. new175. props.load(b2); 176. 177. new178. props.setProperty(key, value); 179. "update"); 180. // 关闭资源181. catch182. e.printStackTrace(); 183. catch184. e.printStackTrace(); 185. finally1866. try187. out.close(); 188. in.close(); 189. catch190. // TODO Auto-generated catch block191. e.printStackTrace(); 192. } 193. } 194. return null; 195. } 196. 197. /**198. * 1999年读写jar外的properties文件. * 200. * @param filename201. * @param key202. * @param value203. */204. public static void205. String value) { 206. if (null == filename || null207. return; 208. } 209. "java.class.path"); 210. 0, outPathString 211. "\\") + 1); 212. 213. String filePath = outPathString + filename; 214. new215. null; 216. null; 217. try218. new BufferedInputStream(new219. props.load(b2); 220. 221. new FileOutputStream(new222. props.setProperty(key, value); 223. "update"); 224. // 关闭资源225. catch226. setProp(filename,key,value); 227. catch228. e.printStackTrace(); 229. finally23000. try231. if(null!=out){ 232. out.close(); 233. } 234. if(null!=b2){ 235. b2.close(); 236. } 237. catch238. // TODO Auto-generated catch block239. e.printStackTrace(); 240. } 241. } 242. 243. } 244. /**245. * 以行的形式写ja内的文件246. * 247. * @param filename248. * @param key249. * @param value250. */251. public static void252. if (null == filename || null253. return; 254. } 255. class) + filename; 256. 257. null; 258. null; 259. byte[] cont=new byte[4]; 260. ""; 261. try262. ///先读取源文件的内容，再追加内容263. new BufferedInputStream(new264. int265. while(res!=-1){ 266. new267. res=b2.read(cont); 268. } 269. //追加270. contentResult+=content; 271. new FileOutputStream(new272. out.write(contentResult.getBytes()); 273. // 关闭资源274. catch275. catch276. e.printStackTrace(); 277. finally278. try279. if(null!=out){ 280. out.close(); 281. } 282. if(null!=b2){ 283. b2.close(); 284. } 285. catch286. // TODO Auto-generated catch block287. e.printStackTrace(); 288. } 289. } 290. 291. 292. } 293. /**294. * 以行的形式写jar以外的文件295. * 296. * @param filename297. * @param key298. * @param value299. */300. public static void301. if (null == filename || null302. return; 303. } 304. "java.class.path"); 305. 0, outPathString 306. "\\") + 1); 307. 308. String filePath = outPathString + filename; 309. null; 310. null; 311. byte[] cont=new byte[1024]; 312. ""; 313. try314. ///先读取源文件的内容，再追加内容315. new BufferedInputStream(new316. int317. while(res!=-1){ 318. new319. res=b2.read(cont); 320. } 321. //追加322. contentResult+=content; 323. new324. out.write(contentResult.getBytes()); 325. // 关闭资源326. catch327. writeLineInerFile(filename,content); 328. catch329. e.printStackTrace(); 330. finally331. try332. if(null!=out){ 333. out.close(); 334. } 335. if(null!=b2){ 336. b2.close(); 337. } 338. catch339. // TODO Auto-generated catch block340. e.printStackTrace(); 341. } 342. } 343. 344. } 345. /**346. * 阅读jar外properties文件的属性347. * 348. * @param filename349. * @param key350. * @param value351. */352. public static353. if (null == filename || null354. return null; 355. } 356. "java.class.path"); 357. 0, outPathString 358. "\\") + 1); 359. 360. String filePath = outPathString + filename; 361. new362. null; 363. try364. new BufferedInputStream(new365. props.load(b2); 366. return367. // 关闭资源368. catch369. return370. catch371. e.printStackTrace(); 372. finally373. try374. if(null!=b2){ 375. b2.close(); 376. } 377. catch378. // TODO Auto-generated catch block379. e.printStackTrace(); 380. } 381. } 382. return null; 383. 384. } 385. 386. public static void main(String[] args) throws387. "error.txt","fiowe"); 388. 389. } 390. }
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