Commons Lang 包常用方法

很多常用的功能就不用自己去实现了，使用commons里面自带的实现更方便。

001	public class TestLangDemo {

002

003	public void charSetDemo() {

004	System.out.println("**CharSetDemo**");

005	CharSet charSet = CharSet.getInstance("aeiou");

006	String demoStr = "The quick brown fox jumps over the lazy dog.";

007	int count = 0;

008	for (int i = 0, len = demoStr.length(); i < len; i++) {

009	if (charSet.contains(demoStr.charAt(i))) {

010

count++;

011

}

012

}

013	System.out.println("count: " + count);

014

}

015

016	public void charSetUtilsDemo() {

017	System.out.println("**CharSetUtilsDemo**");

018	System.out.println("计算字符串中包含某字符数.");

019	System.out.println(CharSetUtils.count("The quick brown fox jumps over the lazy dog.", "aeiou"));

020

021	System.out.println("删除字符串中某字符.");

022	System.out.println(CharSetUtils.delete("The quick brown fox jumps over the lazy dog.", "aeiou"));

023

024	System.out.println("保留字符串中某字符.");

025	System.out.println(CharSetUtils.keep("The quick brown fox jumps over the lazy dog.", "aeiou"));

026

027	System.out.println("合并重复的字符.");

028	System.out.println(CharSetUtils.squeeze("a  bbbbbb     c dd", "b d"));

029

}

030

031	public void objectUtilsDemo() {

032	System.out.println("**ObjectUtilsDemo**");

033	System.out.println("Object为null时，默认打印某字符.");

034	Object obj = null;

035	System.out.println(ObjectUtils.defaultIfNull(obj, "空"));

036

037	System.out.println("验证两个引用是否指向的Object是否相等,取决于Object的equals()方法.");

038	Object a = new Object();

039	Object b = a;

040	Object c = new Object();

041	System.out.println(ObjectUtils.equals(a, b));

042	System.out.println(ObjectUtils.equals(a, c));

043

044	System.out.println("用父类Object的toString()方法返回对象信息.");

045	Date date = new Date();

046	System.out.println(ObjectUtils.identityToString(date));

047	System.out.println(date);

048

049	System.out.println("返回类本身的toString()方法结果,对象为null时，返回0长度字符串.");

050	System.out.println(ObjectUtils.toString(date));

051	System.out.println(ObjectUtils.toString(null));

052	System.out.println(date);

053

}

054

055	public void serializationUtilsDemo() {

056	System.out.println("*SerializationUtils**");

057	Date date = new Date();

058	byte[] bytes = SerializationUtils.serialize(date);

059	System.out.println(ArrayUtils.toString(bytes));

060	System.out.println(date);

061

062	Date reDate = (Date) SerializationUtils.deserialize(bytes);

063	System.out.println(reDate);

064	System.out.println(ObjectUtils.equals(date, reDate));

065	System.out.println(date == reDate);

066

067	FileOutputStream fos = null;

068	FileInputStream fis = null;

069

try {

070	fos = new FileOutputStream(new File("d:/test.txt"));

071	fis = new FileInputStream(new File("d:/test.txt"));

072	SerializationUtils.serialize(date, fos);

073	Date reDate2 = (Date) SerializationUtils.deserialize(fis);

074

075	System.out.println(date.equals(reDate2));

076

077	} catch (FileNotFoundException e) {

078	e.printStackTrace();

079	} finally {

080

try {

081	fos.close();

082	fis.close();

083	} catch (IOException e) {

084	e.printStackTrace();

085

}

086

}

087

088

}

089

090	public void randomStringUtilsDemo() {

091	System.out.println("**RandomStringUtilsDemo**");

092	System.out.println("生成指定长度的随机字符串,好像没什么用.");

093	System.out.println(RandomStringUtils.random(500));

094

095	System.out.println("在指定字符串中生成长度为n的随机字符串.");

096	System.out.println(RandomStringUtils.random(5, "abcdefghijk"));

097

098	System.out.println("指定从字符或数字中生成随机字符串.");

099	System.out.println(RandomStringUtils.random(5, true, false));

100	System.out.println(RandomStringUtils.random(5, false, true));

101

102

}

103

104	public void stringUtilsDemo() {

105	System.out.println("**StringUtilsDemo**");

106	System.out.println("将字符串重复n次，将文字按某宽度居中，将字符串数组用某字符串连接.");

107	String[] header = new String[3];

108	header[0] = StringUtils.repeat("*", 50);

109	header[1] = StringUtils.center("  StringUtilsDemo  ", 50, "^O^");

110	header[2] = header[0];

111	String head = StringUtils.join(header, "\n");

112	System.out.println(head);

113

114	System.out.println("缩短到某长度,用...结尾.");

115	System.out.println(StringUtils.abbreviate("The quick brown fox jumps over the lazy dog.", 10));

116	System.out.println(StringUtils.abbreviate("The quick brown fox jumps over the lazy dog.", 15, 10));

117

118	System.out.println("返回两字符串不同处索引号.");

119	System.out.println(StringUtils.indexOfDifference("aaabc", "aaacc"));

120

121	System.out.println("返回两字符串不同处开始至结束.");

122	System.out.println(StringUtils.difference("aaabcde", "aaaccde"));

123

124	System.out.println("截去字符串为以指定字符串结尾的部分.");

125	System.out.println(StringUtils.chomp("aaabcde", "de"));

126

127	System.out.println("检查一字符串是否为另一字符串的子集.");

128	System.out.println(StringUtils.containsOnly("aad", "aadd"));

129

130	System.out.println("检查一字符串是否不是另一字符串的子集.");

131	System.out.println(StringUtils.containsNone("defg", "aadd"));

132

133	System.out.println("检查一字符串是否包含另一字符串.");

134	System.out.println(StringUtils.contains("defg", "ef"));

135	System.out.println(StringUtils.containsOnly("ef", "defg"));

136

137	System.out.println("返回可以处理null的toString().");

138	System.out.println(StringUtils.defaultString("aaaa"));

139	System.out.println("?" + StringUtils.defaultString(null) + "!");

140

141	System.out.println("去除字符中的空格.");

142	System.out.println(StringUtils.deleteWhitespace("aa  bb  cc"));

143

144	System.out.println("分隔符处理成数组.");

145	String[] strArray = StringUtils.split("a,b,,c,d,null,e", ",");

146	System.out.println(strArray.length);

147	System.out.println(strArray.toString());

148

149	System.out.println("判断是否是某类字符.");

150	System.out.println(StringUtils.isAlpha("ab"));

151	System.out.println(StringUtils.isAlphanumeric("12"));

152	System.out.println(StringUtils.isBlank(""));

153	System.out.println(StringUtils.isNumeric("123"));

154

}

155

156	public void systemUtilsDemo() {

157	System.out.println(genHeader("SystemUtilsDemo"));

158	System.out.println("获得系统文件分隔符.");

159	System.out.println(SystemUtils.FILE_SEPARATOR);

160

161	System.out.println("获得源文件编码.");

162	System.out.println(SystemUtils.FILE_ENCODING);

163

164	System.out.println("获得ext目录.");

165	System.out.println(SystemUtils.JAVA_EXT_DIRS);

166

167	System.out.println("获得java版本.");

168	System.out.println(SystemUtils.JAVA_VM_VERSION);

169

170	System.out.println("获得java厂商.");

171	System.out.println(SystemUtils.JAVA_VENDOR);

172

}

173

174	public void classUtilsDemo() {

175	System.out.println(genHeader("ClassUtilsDemo"));

176	System.out.println("获取类实现的所有接口.");

177	System.out.println(ClassUtils.getAllInterfaces(Date.class));

178

179	System.out.println("获取类所有父类.");

180	System.out.println(ClassUtils.getAllSuperclasses(Date.class));

181

182	System.out.println("获取简单类名.");

183	System.out.println(ClassUtils.getShortClassName(Date.class));

184

185	System.out.println("获取包名.");

186	System.out.println(ClassUtils.getPackageName(Date.class));

187

188	System.out.println("判断是否可以转型.");

189	System.out.println(ClassUtils.isAssignable(Date.class, Object.class));

190	System.out.println(ClassUtils.isAssignable(Object.class, Date.class));

191

}

192

193	public void stringEscapeUtilsDemo() {

194	System.out.println(genHeader("StringEcsapeUtils"));

195	System.out.println("转换特殊字符.");

196	System.out.println("html:" + StringEscapeUtils.escapeHtml3(" "));

197	System.out.println("html:" + StringEscapeUtils.escapeHtml4(" "));

198	System.out.println("html:" + StringEscapeUtils.unescapeHtml3("<p>"));

199	System.out.println("html:" + StringEscapeUtils.unescapeHtml4("<p>"));

200

}

201

202	private final class BuildDemo {

203	String name;

204

int age;

205

206	public BuildDemo(String name, int age) {

207	this.name = name;

208	this.age = age;

209

}

210

211	public String toString() {

212	ToStringBuilder tsb = new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE);

213	tsb.append("Name", name);

214	tsb.append("Age", age);

215	return tsb.toString();

216

}

217

218	public int hashCode() {

219	HashCodeBuilder hcb = new HashCodeBuilder();

220	hcb.append(name);

221	hcb.append(age);

222	return hcb.hashCode();

223

}

224

225	public boolean equals(Object obj) {

226	if (!(obj instanceof BuildDemo)) {

227	return false;

228

}

229	BuildDemo bd = (BuildDemo) obj;

230	EqualsBuilder eb = new EqualsBuilder();

231	eb.append(name, bd.name);

232	eb.append(age, bd.age);

233	return eb.isEquals();

234

}

235

}

236

237	public void builderDemo() {

238	System.out.println(genHeader("BuilderDemo"));

239	BuildDemo obj1 = new BuildDemo("a", 1);

240	BuildDemo obj2 = new BuildDemo("b", 2);

241	BuildDemo obj3 = new BuildDemo("a", 1);

242

243	System.out.println("toString()");

244	System.out.println(obj1);

245	System.out.println(obj2);

246	System.out.println(obj3);

247

248	System.out.println("hashCode()");

249	System.out.println(obj1.hashCode());

250	System.out.println(obj2.hashCode());

251	System.out.println(obj3.hashCode());

252

253	System.out.println("equals()");

254	System.out.println(obj1.equals(obj2));

255	System.out.println(obj1.equals(obj3));

256

}

257

258	public void numberUtils() {

259	System.out.println(genHeader("NumberUtils"));

260	System.out.println("字符串转为数字(不知道有什么用).");

261	System.out.println(NumberUtils.toInt("ba", 33));

262

263	System.out.println("从数组中选出最大值.");

264	System.out.println(NumberUtils.max(new int[] { 1, 2, 3, 4 }));

265

266	System.out.println("判断字符串是否全是整数.");

267	System.out.println(NumberUtils.isDigits("123.1"));

268

269	System.out.println("判断字符串是否是有效数字.");

270	System.out.println(NumberUtils.isNumber("0123.1"));

271

}

272

273	public void dateFormatUtilsDemo() {

274	System.out.println(genHeader("DateFormatUtilsDemo"));

275	System.out.println("格式化日期输出.");

276	System.out.println(DateFormatUtils.format(System.currentTimeMillis(), "yyyy-MM-dd HH:mm:ss"));

277

278	System.out.println("秒表.");

279	StopWatch sw = new StopWatch();

280	sw.start();

281

282	for (Iterator iterator = DateUtils.iterator(new Date(), DateUtils.RANGE_WEEK_CENTER); iterator.hasNext();) {

283	Calendar cal = (Calendar) iterator.next();

284	System.out.println(DateFormatUtils.format(cal.getTime(), "yy-MM-dd HH:mm"));

285

}

286

287	sw.stop();

288	System.out.println("秒表计时:" + sw.getTime());

289

290

}

291

292	private String genHeader(String head) {

293	String[] header = new String[3];

294	header[0] = StringUtils.repeat("*", 50);

295	header[1] = StringUtils.center("  " + head + "  ", 50, "^O^");

296	header[2] = header[0];

297	return StringUtils.join(header, "\n");

298

}

299

300	private void validateDemo() {

301	String[] strarray = { "a", "b", "c" };

302	System.out.println("验证功能");

303	System.out.println(Validate.notEmpty(strarray));

304

}

305

306	private void wordUtilsDemo() {

307	System.out.println("单词处理功能");

308	String str1 = "wOrD";

309	String str2 = "ghj\nui\tpo";

310	System.out.println(WordUtils.capitalize(str1)); // 首字母大写

311	System.out.println(WordUtils.capitalizeFully(str1)); // 首字母大写其它字母小写

312	char[] ctrg = { '.' };

313	System.out.println(WordUtils.capitalizeFully("i aM.fine", ctrg)); // 在规则地方转换

314	System.out.println(WordUtils.initials(str1)); // 获取首字母

315	System.out.println(WordUtils.initials("Ben John Lee", null)); // 取每个单词的首字母

316	char[] ctr = { ' ', '.' };

317	System.out.println(WordUtils.initials("Ben J.Lee", ctr)); // 按指定规则获取首字母

318	System.out.println(WordUtils.swapCase(str1)); // 大小写逆转

319	System.out.println(WordUtils.wrap(str2, 1)); // 解析\n和\t等字符

320

}

321

322

/**

323	* @param args

324

*/

325	public static void main(String[] args) {

326	TestLangDemo langDemo = new TestLangDemo();

327

328	langDemo.charSetDemo();

329	langDemo.charSetUtilsDemo();

330	langDemo.objectUtilsDemo();

331	langDemo.serializationUtilsDemo();

332	langDemo.randomStringUtilsDemo();

333	langDemo.stringUtilsDemo();

334	langDemo.systemUtilsDemo();

335	langDemo.classUtilsDemo();

336	langDemo.stringEscapeUtilsDemo();

337	langDemo.builderDemo();

338	langDemo.numberUtils();

339	langDemo.dateFormatUtilsDemo();

340	langDemo.validateDemo();

341	langDemo.wordUtilsDemo();

342

}

343

344

}