【java】org.apache.commons.lang3功能示例

时间：2022-08-23 16:03:29

org.apache.commons.lang3功能示例

package com.simple.test; 

import java.util.Date;

import java.util.Iterator;

import java.util.Map; 

import org.apache.commons.lang3.ArrayUtils;

import org.apache.commons.lang3.ClassUtils;

import org.apache.commons.lang3.RandomStringUtils;

import org.apache.commons.lang3.StringEscapeUtils;

import org.apache.commons.lang3.StringUtils;

import org.apache.commons.lang3.SystemUtils;

import org.apache.commons.lang3.math.NumberUtils;

import org.apache.commons.lang3.time.DateFormatUtils;

import org.apache.commons.lang3.time.DateUtils;

import org.junit.Test; 

public class TestString { 

    public static void main(String[] args) {

        String[] test = { "33", "ddffd" };

        String[] test2 = { "33", "ddffd" };

        String[] test1 = { "ddffd", "33" }; 

        // 1.判断两个数据是否相等, 如果内容相同， 顺序相同 则返回 真

        System.out.println("判断两个数组是否相同: " + ArrayUtils.isEquals(test, test2));

        System.out.println("判断数组中是否包含一个对象: " + ArrayUtils.contains(test, "33")); 

        // 2.{33,ddffd} 将数组内容以{,}形式输出．

        System.out.println("输出数组中的数据: "+ArrayUtils.toString(test)); 

        System.out.println("讲一个二维数组转换成MAP....");

        Map map = ArrayUtils.toMap(new String[][] { { "RED", "#FF0000" }, { "GREEN", "#00FF00" }, { "BLUE", "#0000FF" } });

        // 3.toMap 一个数组，但每个元素 Each element of the array

        // must be either a {@link java.util.Map.Entry} or an Array,

        // 方式一 下面是遍历map的方式，取得其keySet.iterator();

        Iterator it = map.keySet().iterator();

        while (it.hasNext()) {

            String key = (String) it.next();

            // it.next()只包含key

            System.out.println("key:" + key + "value:" + map.get(key));

        }

        System.out.println("讲一个二维数组转换成MAP 打印结束....");

        // 方式二,取得其entrySet()集合,

        Iterator it1 = map.entrySet().iterator();

        while (it.hasNext()) {

            Map.Entry entry = (Map.Entry) it1.next();

            // it1.next()中包含key和value

            System.out.println("key :" + entry.getKey() + "value :" + entry.getValue());

        } 

        // 4.取得类名

        System.out.println("取得一个类的名称: "+ ClassUtils.getShortClassName(Test.class));

        // 取得其包名

        System.out.println("取得一个类的包名: "+ ClassUtils.getPackageName(Test.class));

        // 5.NumberUtils

        System.out.println("将一个字符串转换成数字: "+ NumberUtils.toInt("6"));

        System.out.println("将一个字符串转换成数字, 输入一个默认参数: "+ NumberUtils.toInt("7", 10));// 返回7 如果第一个参数为 null 返回10  

        // 6.五位的随机字母和数字

        System.out.println("取得随机字母和数字: "+RandomStringUtils.randomAlphanumeric(15));

        // 7.StringEscapeUtils

        System.out.println(StringEscapeUtils.unescapeHtml3("</html>"));

        // 输出结果为&lt;html&gt;

        System.out.println(StringEscapeUtils.escapeJava("String"));

        // 8.StringUtils,判断是否是空格字符

        System.out.println("判断一个字符串是否是 空格: "+StringUtils.isBlank("   "));

        // 将数组中的内容以,分隔

        System.out.println("将数组中的内容以,分隔: "+ StringUtils.join(test, ","));

        // 在右边加下字符,使之总长度为6

        System.out.println("在右边加下字符,使之总长度为6: "+ StringUtils.rightPad("abc", 6, 'T'));

        // 首字母大写

        System.out.println("首字母大写: "+ StringUtils.capitalize("abc"));

        // Deletes all whitespaces from a String 删除所有空格

        System.out.println("删除所有空格 : "+ StringUtils.deleteWhitespace("   ab  c  "));

        // 判断是否包含这个字符

        System.out.println("判断是否包含这个字符 : "+ StringUtils.contains("abc", "ab"));

        // 表示左边两个字符

        System.out.println("取得一个字符串左边的两个字符: "+ StringUtils.left("abc", 2));

        System.out.println("取得一个字符串右边的三个字符 : "+ StringUtils.right("abcd", 3)); 

        System.out.println("把一个字符串转换为BigDecimal对象: " + NumberUtils.createBigDecimal("0.25"));

        System.out.println("找出最大值: " + NumberUtils.max(new int[]{1,2,3}));

        System.out.println("JavaHome: " + SystemUtils.getJavaHome());

        System.out.println("临时目录位置: " + SystemUtils.getJavaIoTmpDir()); 

        System.out.println("日期格式处理: " + DateFormatUtils.format(new Date(), "yyyy-MM-dd HH:mm:ss"));

        System.out.println("日期加 7天: " + DateFormatUtils.format(DateUtils.addDays(new Date(), 7), "yyyy-MM-dd HH:mm:ss")); 

    }

} 
import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Calendar;

import java.util.Date;

import java.util.Iterator;  

import org.apache.commons.lang3.ArrayUtils;

import org.apache.commons.lang3.CharSet;

import org.apache.commons.lang3.CharSetUtils;

import org.apache.commons.lang3.ClassUtils;

import org.apache.commons.lang3.ObjectUtils;

import org.apache.commons.lang3.RandomStringUtils;

import org.apache.commons.lang3.SerializationUtils;

import org.apache.commons.lang3.StringUtils;

import org.apache.commons.lang3.SystemUtils;

import org.apache.commons.lang3.builder.EqualsBuilder;

import org.apache.commons.lang3.builder.HashCodeBuilder;

import org.apache.commons.lang3.builder.ToStringBuilder;

import org.apache.commons.lang3.builder.ToStringStyle;

import org.apache.commons.lang3.math.NumberUtils;

import org.apache.commons.lang3.time.DateFormatUtils;

import org.apache.commons.lang3.time.DateUtils;

import org.apache.commons.lang3.time.StopWatch;

import org.apache.commons.lang3.StringEscapeUtils;  

/**

 * @author Administrator

 *http://commons.apache.org/proper/commons-lang/userguide.html

 */

public class LangDemo

{

    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("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.escapeHtml4("/n\n"));

        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");

    }  

    /**

     * @param args

     */

    public static void main(String[] args)

    {

        LangDemo langDemo = new LangDemo();  

        langDemo.charSetDemo();

        langDemo.charSetUtilsDemo();

        langDemo.objectUtilsDemo();

        langDemo.serializationUtilsDemo();

        langDemo.randomStringUtilsDemo();

        langDemo.stringUtilsDemo();

        langDemo.systemUtilsDemo();

        langDemo.classUtilsDemo();

        langDemo.stringEscapeUtilsDemo();

        langDemo.builderDemo();

        langDemo.numberUtils();

        langDemo.dateFormatUtilsDemo();  

    }  

}

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