commons-lang中常用方法

怼烎@ 2022-09-23 13:00 85阅读 0赞

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();  
        }  
       
    }