org.apache.commons.lang3功能示例

package com.hbk.test;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();      }  }