commons-lang中經常使用方法

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("計算字符串中包含某字符數.");

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

 

        System.out.println("刪除字符串中某字符.");

        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("合併重複的字符.");

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

    }

 

    public void objectUtilsDemo() {

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

        System.out.println("Object爲null時，默認打印某字符.");

        Object obj = null;

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

 

        System.out.println("驗證兩個引用是否指向的Object是否相等,取決於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("用父類Object的toString()方法返回對象信息.");

        Date date = new Date();

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

        System.out.println(date);

 

        System.out.println("返回類自己的toString()方法結果,對象爲null時，返回0長度字符串.");

        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("生成指定長度的隨機字符串,好像沒什麼用.");

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

 

        System.out.println("在指定字符串中生成長度爲n的隨機字符串.");

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

 

        System.out.println("指定從字符或數字中生成隨機字符串.");

        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("將字符串重複n次，將文字按某寬度居中，將字符串數組用某字符串鏈接.");

        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("縮短到某長度,用...結尾.");

        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("返回兩字符串不一樣處索引號.");

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

 

        System.out.println("返回兩字符串不一樣處開始至結束.");

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

 

        System.out.println("截去字符串爲以指定字符串結尾的部分.");

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

 

        System.out.println("檢查一字符串是否爲另外一字符串的子集.");

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

 

        System.out.println("檢查一字符串是否不是另外一字符串的子集.");

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

 

        System.out.println("檢查一字符串是否包含另外一字符串.");

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

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

 

        System.out.println("返回能夠處理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("分隔符處理成數組.");

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

        System.out.println(strArray.length);

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

 

        System.out.println("判斷是不是某類字符.");

        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("得到系統文件分隔符.");

        System.out.println(SystemUtils.FILE_SEPARATOR);

 

        System.out.println("得到源文件編碼.");

        System.out.println(SystemUtils.FILE_ENCODING);

 

        System.out.println("得到ext目錄.");

        System.out.println(SystemUtils.JAVA_EXT_DIRS);

 

        System.out.println("得到java版本.");

        System.out.println(SystemUtils.JAVA_VM_VERSION);

 

        System.out.println("得到java廠商.");

        System.out.println(SystemUtils.JAVA_VENDOR);

    }

 

    public void classUtilsDemo() {

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

        System.out.println("獲取類實現的全部接口.");

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

 

        System.out.println("獲取類全部父類.");

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

 

        System.out.println("獲取簡單類名.");

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

 

        System.out.println("獲取包名.");

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

 

        System.out.println("判斷是否能夠轉型.");

        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("轉換特殊字符.");

        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("字符串轉爲數字(不知道有什麼用).");

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

 

        System.out.println("從數組中選出最大值.");

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

 

        System.out.println("判斷字符串是否全是整數.");

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

 

        System.out.println("判斷字符串是不是有效數字.");

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

    }

 

    public void dateFormatUtilsDemo() {

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

        System.out.println("格式化日期輸出.");

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

 

        System.out.println("秒錶.");

        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("秒錶計時:" + 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("驗證功能");

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

    }

 

    private void wordUtilsDemo() {

        System.out.println("單詞處理功能");

        String str1 = "wOrD";

        String str2 = "ghj\nui\tpo";

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

        System.out.println(WordUtils.capitalizeFully(str1)); // 首字母大寫其它字母小寫

        char[] ctrg = { '.' };

        System.out.println(WordUtils.capitalizeFully("i aM.fine", ctrg)); // 在規則地方轉換

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

        System.out.println(WordUtils.initials("Ben John Lee", null)); // 取每一個單詞的首字母

        char[] ctr = { ' ', '.' };

        System.out.println(WordUtils.initials("Ben J.Lee", ctr)); // 按指定規則獲取首字母

        System.out.println(WordUtils.swapCase(str1)); // 大小寫逆轉

        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();

    }

 

}