【java】org.apache.commons.lang3功能示例

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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