commons-lang中常用方法

commons-lang方法介绍 /

apache-commons-lang /
commons-lang工具 /
java工具类 /
commons.lang包方法使用
10153
[java] view plain cpublic 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();  
    }  
   
}