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。

public class TestLangDemo {     public void charSetDemo() {    System.out.println("**CharSetDemo**");    CharSet charSet = CharSet.getInstance("aeiou");    String demoStr = "The quick brown fox jumps over the lazy dog.";    int count = 0;    for (int i = 0, len = demoStr.length(); i < len; i++) {     if (charSet.contains(demoStr.charAt(i))) {      count++;     }    }    System.out.println("count: " + count);   }     public void charSetUtilsDemo() {    System.out.println("**CharSetUtilsDemo**");    System.out.println("计算字符串中包含某字符数.");    System.out.println(CharSetUtils.count("The quick brown fox jumps over the lazy dog.", "aeiou"));      System.out.println("删除字符串中某字符.");    System.out.println(CharSetUtils.delete("The quick brown fox jumps over the lazy dog.", "aeiou"));      System.out.println("保留字符串中某字符.");    System.out.println(CharSetUtils.keep("The quick brown fox jumps over the lazy dog.", "aeiou"));      System.out.println("合并重复的字符.");    System.out.println(CharSetUtils.squeeze("a  bbbbbb     c dd", "b d"));   }     public void objectUtilsDemo() {    System.out.println("**ObjectUtilsDemo**");    System.out.println("Object为null时，默认打印某字符.");    Object obj = null;    System.out.println(ObjectUtils.defaultIfNull(obj, "空"));      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.");    Object a = new Object();    Object b = a;    Object c = new Object();    System.out.println(ObjectUtils.equals(a, b));    System.out.println(ObjectUtils.equals(a, c));      System.out.println("用父类Object的toString()方法返回对象信息.");    Date date = new Date();    System.out.println(ObjectUtils.identityToString(date));    System.out.println(date);      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.");    System.out.println(ObjectUtils.toString(date));    System.out.println(ObjectUtils.toString(null));    System.out.println(date);   }     public void serializationUtilsDemo() {    System.out.println("*SerializationUtils**");    Date date = new Date();    byte[] bytes = SerializationUtils.serialize(date);    System.out.println(ArrayUtils.toString(bytes));    System.out.println(date);      Date reDate = (Date) SerializationUtils.deserialize(bytes);    System.out.println(reDate);    System.out.println(ObjectUtils.equals(date, reDate));    System.out.println(date == reDate);      FileOutputStream fos = null;    FileInputStream fis = null;    try {     fos = new FileOutputStream(new File("d:/test.txt"));     fis = new FileInputStream(new File("d:/test.txt"));     SerializationUtils.serialize(date, fos);     Date reDate2 = (Date) SerializationUtils.deserialize(fis);       System.out.println(date.equals(reDate2));      } catch (FileNotFoundException e) {     e.printStackTrace();    } finally {     try {      fos.close();      fis.close();     } catch (IOException e) {      e.printStackTrace();     }    }     }     public void randomStringUtilsDemo() {    System.out.println("**RandomStringUtilsDemo**");    System.out.println("生成指定长度的随机字符串,好像没什么用.");    System.out.println(RandomStringUtils.random(500));      System.out.println("在指定字符串中生成长度为n的随机字符串.");    System.out.println(RandomStringUtils.random(5, "abcdefghijk"));      System.out.println("指定从字符或数字中生成随机字符串.");    System.out.println(RandomStringUtils.random(5, true, false));    System.out.println(RandomStringUtils.random(5, false, true));     }     public void stringUtilsDemo() {    System.out.println("**StringUtilsDemo**");    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.");    String[] header = new String[3];    header[0] = StringUtils.repeat("*", 50);    header[1] = StringUtils.center("  StringUtilsDemo  ", 50, "^O^");    header[2] = header[0];    String head = StringUtils.join(header, "\n");    System.out.println(head);      System.out.println("缩短到某长度,用...结尾.");    System.out.println(StringUtils.abbreviate("The quick brown fox jumps over the lazy dog.", 10));    System.out.println(StringUtils.abbreviate("The quick brown fox jumps over the lazy dog.", 15, 10));      System.out.println("返回两字符串不同处索引号.");    System.out.println(StringUtils.indexOfDifference("aaabc", "aaacc"));      System.out.println("返回两字符串不同处开始至结束.");    System.out.println(StringUtils.difference("aaabcde", "aaaccde"));      System.out.println("截去字符串为以指定字符串结尾的部分.");    System.out.println(StringUtils.chomp("aaabcde", "de"));      System.out.println("检查一字符串是否为另一字符串的子集.");    System.out.println(StringUtils.containsOnly("aad", "aadd"));      System.out.println("检查一字符串是否不是另一字符串的子集.");    System.out.println(StringUtils.containsNone("defg", "aadd"));      System.out.println("检查一字符串是否包含另一字符串.");    System.out.println(StringUtils.contains("defg", "ef"));    System.out.println(StringUtils.containsOnly("ef", "defg"));      System.out.println("返回可以处理null的toString().");    System.out.println(StringUtils.defaultString("aaaa"));    System.out.println("?" + StringUtils.defaultString(null) + "!");      System.out.println("去除字符中的空格.");    System.out.println(StringUtils.deleteWhitespace("aa  bb  cc"));      System.out.println("分隔符处理成数组.");    String[] strArray = StringUtils.split("a,b,,c,d,null,e", ",");    System.out.println(strArray.length);    System.out.println(strArray.toString());      System.out.println("判断是否是某类字符.");    System.out.println(StringUtils.isAlpha("ab"));    System.out.println(StringUtils.isAlphanumeric("12"));    System.out.println(StringUtils.isBlank(""));    System.out.println(StringUtils.isNumeric("123"));   }     public void systemUtilsDemo() {    System.out.println(genHeader("SystemUtilsDemo"));    System.out.println("获得系统文件分隔符.");    System.out.println(SystemUtils.FILE_SEPARATOR);      System.out.println("获得源文件编码.");    System.out.println(SystemUtils.FILE_ENCODING);      System.out.println("获得ext目录.");    System.out.println(SystemUtils.JAVA_EXT_DIRS);      System.out.println("获得java版本.");    System.out.println(SystemUtils.JAVA_VM_VERSION);      System.out.println("获得java厂商.");    System.out.println(SystemUtils.JAVA_VENDOR);   }     public void classUtilsDemo() {    System.out.println(genHeader("ClassUtilsDemo"));    System.out.println("获取类实现的所有接口.");    System.out.println(ClassUtils.getAllInterfaces(Date.class));      System.out.println("获取类所有父类.");    System.out.println(ClassUtils.getAllSuperclasses(Date.class));      System.out.println("获取简单类名.");    System.out.println(ClassUtils.getShortClassName(Date.class));      System.out.println("获取包名.");    System.out.println(ClassUtils.getPackageName(Date.class));      System.out.println("判断是否可以转型.");    System.out.println(ClassUtils.isAssignable(Date.class, Object.class));    System.out.println(ClassUtils.isAssignable(Object.class, Date.class));   }     public void stringEscapeUtilsDemo() {    System.out.println(genHeader("StringEcsapeUtils"));    System.out.println("转换特殊字符.");    System.out.println("html:" + StringEscapeUtils.escapeHtml3(" "));    System.out.println("html:" + StringEscapeUtils.escapeHtml4(" "));    System.out.println("html:" + StringEscapeUtils.unescapeHtml3("<p>"));    System.out.println("html:" + StringEscapeUtils.unescapeHtml4("<p>"));   }     private final class BuildDemo {    String name;    int age;      public BuildDemo(String name, int age) {     this.name = name;     this.age = age;    }      public String toString() {     ToStringBuilder tsb = new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE);     tsb.append("Name", name);     tsb.append("Age", age);     return tsb.toString();    }      public int hashCode() {     HashCodeBuilder hcb = new HashCodeBuilder();     hcb.append(name);     hcb.append(age);     return hcb.hashCode();    }      public boolean equals(Object obj) {     if (!(obj instanceof BuildDemo)) {      return false;     }     BuildDemo bd = (BuildDemo) obj;     EqualsBuilder eb = new EqualsBuilder();     eb.append(name, bd.name);     eb.append(age, bd.age);     return eb.isEquals();    }   }     public void builderDemo() {    System.out.println(genHeader("BuilderDemo"));    BuildDemo obj1 = new BuildDemo("a", 1);    BuildDemo obj2 = new BuildDemo("b", 2);    BuildDemo obj3 = new BuildDemo("a", 1);      System.out.println("toString()");    System.out.println(obj1);    System.out.println(obj2);    System.out.println(obj3);      System.out.println("hashCode()");    System.out.println(obj1.hashCode());    System.out.println(obj2.hashCode());    System.out.println(obj3.hashCode());      System.out.println("equals()");    System.out.println(obj1.equals(obj2));    System.out.println(obj1.equals(obj3));   }     public void numberUtils() {    System.out.println(genHeader("NumberUtils"));    System.out.println("字符串转为数字(不知道有什么用).");    System.out.println(NumberUtils.toInt("ba", 33));      System.out.println("从数组中选出最大值.");    System.out.println(NumberUtils.max(new int[] { 1, 2, 3, 4 }));      System.out.println("判断字符串是否全是整数.");    System.out.println(NumberUtils.isDigits("123.1"));      System.out.println("判断字符串是否是有效数字.");    System.out.println(NumberUtils.isNumber("0123.1"));   }     public void dateFormatUtilsDemo() {    System.out.println(genHeader("DateFormatUtilsDemo"));    System.out.println("格式化日期输出.");    System.out.println(DateFormatUtils.format(System.currentTimeMillis(), "yyyy-MM-dd HH:mm:ss"));      System.out.println("秒表.");    StopWatch sw = new StopWatch();    sw.start();      for (Iterator iterator = DateUtils.iterator(new Date(), DateUtils.RANGE_WEEK_CENTER); iterator.hasNext();) {     Calendar cal = (Calendar) iterator.next();     System.out.println(DateFormatUtils.format(cal.getTime(), "yy-MM-dd HH:mm"));    }      sw.stop();    System.out.println("秒表计时:" + sw.getTime());     }     private String genHeader(String head) {    String[] header = new String[3];    header[0] = StringUtils.repeat("*", 50);    header[1] = StringUtils.center("  " + head + "  ", 50, "^O^");    header[2] = header[0];    return StringUtils.join(header, "\n");   }     private void validateDemo() {    String[] strarray = { "a", "b", "c" };    System.out.println("验证功能");    System.out.println(Validate.notEmpty(strarray));   }     private void wordUtilsDemo() {    System.out.println("单词处理功能");    String str1 = "wOrD";    String str2 = "ghj\nui\tpo";    System.out.println(WordUtils.capitalize(str1)); // 首字母大写    System.out.println(WordUtils.capitalizeFully(str1)); // 首字母大写其它字母小写    char[] ctrg = { '.' };    System.out.println(WordUtils.capitalizeFully("i aM.fine", ctrg)); // 在规则地方转换    System.out.println(WordUtils.initials(str1)); // 获取首字母    System.out.println(WordUtils.initials("Ben John Lee", null)); // 取每个单词的首字母    char[] ctr = { ' ', '.' };    System.out.println(WordUtils.initials("Ben J.Lee", ctr)); // 按指定规则获取首字母    System.out.println(WordUtils.swapCase(str1)); // 大小写逆转    System.out.println(WordUtils.wrap(str2, 1)); // 解析\n和\t等字符   }     /**    * @param args    */   public static void main(String[] args) {    TestLangDemo langDemo = new TestLangDemo();      langDemo.charSetDemo();    langDemo.charSetUtilsDemo();    langDemo.objectUtilsDemo();    langDemo.serializationUtilsDemo();    langDemo.randomStringUtilsDemo();    langDemo.stringUtilsDemo();    langDemo.systemUtilsDemo();    langDemo.classUtilsDemo();    langDemo.stringEscapeUtilsDemo();    langDemo.builderDemo();    langDemo.numberUtils();    langDemo.dateFormatUtilsDemo();    langDemo.validateDemo();    langDemo.wordUtilsDemo();   }    }