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.StringEscapeUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.SystemUtils;
import org.apache.commons.lang3.Validate;
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.text.WordUtils;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DateUtils;
import org.apache.commons.lang3.time.StopWatch;
/*转自霸气的小码农的博客*/
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();
}
}
原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/10890.html