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.判斷兩個數據是否相等, 如果內容相同， 順序相同 則返回 真 System.out.println("判斷兩個數組是否相同: " + ArrayUtils.isEquals(test, test2)); System.out.println("判斷數組中是否包含一個對象: " + ArrayUtils.contains(test, "33")); // 2.{33,ddffd} 將數組內容以{,}形式輸出． System.out.println("輸出數組中的數據: "+ArrayUtils.toString(test)); System.out.println("講一個二維數組轉換成MAP...."); Map map = ArrayUtils.toMap(new String[][] { { "RED", "#FF0000" }, { "GREEN", "#00FF00" }, { "BLUE", "#0000FF" } }); // 3.toMap 一個數組，但每個元素 Each element of the array // must be either a {@link java.util.Map.Entry} or an Array, // 方式一 下面是遍歷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("講一個二維數組轉換成MAP 打印結束...."); // 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.取得類名 System.out.println("取得一個類的名稱: "+ ClassUtils.getShortClassName(Test.class)); // 取得其包名 System.out.println("取得一個類的包名: "+ ClassUtils.getPackageName(Test.class)); // 5.NumberUtils System.out.println("將一個字符串轉換成數字: "+ NumberUtils.toInt("6")); System.out.println("將一個字符串轉換成數字, 輸入一個默認參數: "+ NumberUtils.toInt("7", 10));// 返回7 如果第一個參數為 null 返回10 // 6.五位的隨機字母和數字 System.out.println("取得隨機字母和數字: "+RandomStringUtils.randomAlphanumeric(15)); // 7.StringEscapeUtils System.out.println(StringEscapeUtils.unescapeHtml3("</html>")); // 輸出結果為<html> System.out.println(StringEscapeUtils.escapeJava("String")); // 8.StringUtils,判斷是否是空格字符 System.out.println("判斷一個字符串是否是 空格: "+StringUtils.isBlank(" ")); // 將數組中的內容以,分隔 System.out.println("將數組中的內容以,分隔: "+ StringUtils.join(test, ",")); // 在右邊加下字符,使之總長度為6 System.out.println("在右邊加下字符,使之總長度為6: "+ StringUtils.rightPad("abc", 6, 'T')); // 首字母大寫 System.out.println("首字母大寫: "+ StringUtils.capitalize("abc")); // Deletes all whitespaces from a String 刪除所有空格 System.out.println("刪除所有空格 : "+ StringUtils.deleteWhitespace(" ab c ")); // 判斷是否包含這個字符 System.out.println("判斷是否包含這個字符 : "+ StringUtils.contains("abc", "ab")); // 表示左邊兩個字符 System.out.println("取得一個字符串左邊的兩個字符: "+ StringUtils.left("abc", 2)); System.out.println("取得一個字符串右邊的三個字符 : "+ StringUtils.right("abcd", 3)); System.out.println("把一個字符串轉換為BigDecimal對象: " + 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("臨時目錄位置: " + SystemUtils.getJavaIoTmpDir()); System.out.println("日期格式處理: " + 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("計算字符串中包含某字符數."); System.out.println(CharSetUtils.count( "The quick brown fox jumps over the lazy dog.", "aeiou")); System.out.println("刪除字符串中某字符."); 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("合並重復的字符."); System.out.println(CharSetUtils.squeeze("a bbbbbb c dd", "b d")); } public void objectUtilsDemo() { System.out.println("**ObjectUtilsDemo**"); System.out.println("Object為null時，默認打印某字符."); Object obj = null; System.out.println(ObjectUtils.defaultIfNull(obj, "空")); System.out.println("驗證兩個引用是否指向的Object是否相等,取決於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("用父類Object的toString()方法返回對象信息."); Date date = new Date(); System.out.println(ObjectUtils.identityToString(date)); System.out.println(date); System.out.println("返回類本身的toString()方法結果,對象為null時，返回0長度字符串."); 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("生成指定長度的隨機字符串,好像沒什么用."); System.out.println(RandomStringUtils.random(500)); System.out.println("在指定字符串中生成長度為n的隨機字符串."); System.out.println(RandomStringUtils.random(5, "abcdefghijk")); System.out.println("指定從字符或數字中生成隨機字符串."); 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("將字符串重復n次，將文字按某寬度居中，將字符串數組用某字符串連接."); 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("縮短到某長度,用...結尾."); 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("返回兩字符串不同處索引號."); System.out.println(StringUtils.indexOfDifference("aaabc", "aaacc")); System.out.println("返回兩字符串不同處開始至結束."); System.out.println(StringUtils.difference("aaabcde", "aaaccde")); System.out.println("截去字符串為以指定字符串結尾的部分."); System.out.println(StringUtils.chomp("aaabcde", "de")); System.out.println("檢查一字符串是否為另一字符串的子集."); System.out.println(StringUtils.containsOnly("aad", "aadd")); System.out.println("檢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("檢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("返回可以處理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("判斷是否是某類字符."); 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("獲得系統文件分隔符."); System.out.println(SystemUtils.FILE_SEPARATOR); System.out.println("獲得源文件編碼."); System.out.println(SystemUtils.FILE_ENCODING); System.out.println("獲得ext目錄."); System.out.println(SystemUtils.JAVA_EXT_DIRS); System.out.println("獲得java版本."); System.out.println(SystemUtils.JAVA_VM_VERSION); System.out.println("獲得java廠商."); System.out.println(SystemUtils.JAVA_VENDOR); } public void classUtilsDemo() { System.out.println(genHeader("ClassUtilsDemo")); System.out.println("獲取類實現的所有接口."); System.out.println(ClassUtils.getAllInterfaces(Date.class)); System.out.println("獲取類所有父類."); System.out.println(ClassUtils.getAllSuperclasses(Date.class)); System.out.println("獲取簡單類名."); System.out.println(ClassUtils.getShortClassName(Date.class)); System.out.println("獲取包名."); System.out.println(ClassUtils.getPackageName(Date.class)); System.out.println("判斷是否可以轉型."); 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("轉換特殊字符."); 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("字符串轉為數字(不知道有什么用)."); System.out.println(NumberUtils.toInt("ba", 33)); System.out.println("從數組中選出最大值."); System.out.println(NumberUtils.max(new int[] { 1, 2, 3, 4 })); System.out.println("判斷字符串是否全是整數."); System.out.println(NumberUtils.isDigits("123.1")); System.out.println("判斷字符串是否是有效數字."); System.out.println(NumberUtils.isNumber("0123.1")); } public void dateFormatUtilsDemo() { System.out.println(genHeader("DateFormatUtilsDemo")); System.out.println("格式化日期輸出."); 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("秒表計時:" + 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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