commons-lang中常用方法

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();    } }