commons-lang中常用方法

來自： http://blog.csdn.net//chenleixing/article/details/43093991

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("合并重復的字符.");
    System.out.println(CharSetUtils.squeeze("a  bbbbbb     c dd", "b d"));
}

public void objectUtilsDemo() {
    System.out.println("**ObjectUtilsDemo**");
    System.out.println("Object為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("返回類本身的toString()方法結果,對象為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,好像沒什么用.");
    System.out.println(RandomStringUtils.random(500));

    System.out.println("在指定字符串中生成長度為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("將字符串重復n次，將文字按某寬度居中，將字符串數組用某字符串連接.");
    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("返回兩字符串不同處索引號.");
    System.out.println(StringUtils.indexOfDifference("aaabc", "aaacc"));

    System.out.println("返回兩字符串不同處開始至結束.");
    System.out.println(StringUtils.difference("aaabcde", "aaaccde"));

    System.out.println("截去字符串為以指定字符串結尾的部分.");
    System.out.println(StringUtils.chomp("aaabcde", "de"));

    System.out.println("檢查一字符串是否為另一字符串的子集.");
    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("判斷是否是某類字符.");
    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("獲得系統文件分隔符.");
    System.out.println(SystemUtils.FILE_SEPARATOR);

    System.out.println("獲得源文件編碼.");
    System.out.println(SystemUtils.FILE_ENCODING);

    System.out.println("獲得ext目錄.");
    System.out.println(SystemUtils.JAVA_EXT_DIRS);

    System.out.println("獲得java版本.");
    System.out.println(SystemUtils.JAVA_VM_VERSION);

    System.out.println("獲得java廠商.");
    System.out.println(SystemUtils.JAVA_VENDOR);
}

public void classUtilsDemo() {
    System.out.println(genHeader("ClassUtilsDemo"));
    System.out.println("獲取類實現的所有接口.");
    System.out.println(ClassUtils.getAllInterfaces(Date.class));

    System.out.println("獲取類所有父類.");
    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("判斷是否可以轉型.");
    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("字符串轉為數字(不知道有什么用).");
    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("判斷字符串是否是有效數字.");
    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();
}


}</pre>