{"id":303,"date":"2021-01-15T14:58:44","date_gmt":"2021-01-15T06:58:44","guid":{"rendered":"https:\/\/22pig.com\/?p=303"},"modified":"2021-01-15T14:58:44","modified_gmt":"2021-01-15T06:58:44","slug":"java-stringutils-common","status":"publish","type":"post","link":"http:\/\/22pig.com\/?p=303","title":{"rendered":"java-StringUtils commons-lang"},"content":{"rendered":"

\u5de5\u4f5c\u5bb9\u6613\u9047\u5230\u7684\uff1a
\n\u5fc5\u987b\u89818\u4f4d\uff0c\u4e0d\u591f\u7684\u5c31\u62ff0\u53bb\u8865
\nSystem.out.println(StringUtils.leftPad(“34”, 8, “0”));
\n\/\/ 00000034
\n\u53c8\u6216\u8005\u4f60\u9700\u8981\u5728\u4e00\u4e2a\u6570\u7ec4\u4e2d\u52a0\u5165\u4e00\u4e2a\u5143\u7d20\uff0c\u4f60\u53ef\u4ee5\u8fd9\u4e48\u505a\uff1a<\/p>\n

\u628a\u6570\u7ec4\u91cc\u7684\u5b57\u7b26\u4e32\u7528:\u8fde\u63a5
\nSystem.out.println(StringUtils.join(new String[]{“cat”,”dog”,”carrot”,”leaf”,”door”}, “:”)<\/p>\n

\/\/ cat:dog:carrot:leaf:door<\/p>\n

\u5982\u679c\u4f60\u9700\u8981\u4e00\u4e2a\u5927\u5199\u5b57\u6bcd\u6216\u8005\u662f\u9700\u8981\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e2a\u5355\u8bcd\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u5927\u5199\uff0c\u4f60\u53ef\u4ee5\u8fd9\u4e48\u505a\uff1a<\/p>\n

System.out.println(StringUtils.capitaliseAllWords(“a sentenced to be capitalised”));
\n\/\/ A Sentenced To Be Capitalised<\/p>\n

\u5982\u679c\u4f60\u9700\u8981\u8ba1\u7b97\u4e00\u4e2a\u5b57\u6bcd\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u4e2a\u6570\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528countMatches\u65b9\u6cd5\uff1a
\nSystem.out.println(StringUtils.countMatches(“Bethany plays with army men”, “e”));
\n\/\/ 2<\/p>\n

\u751a\u81f3\u8fd8\u6709\u8ba1\u7b97\u4e24\u5b57\u7b26\u4e32\u4e4b\u95f4\u7684Levenshtein-Distance<\/p>\n

System.out.println(StringUtils.getLevenshteinDistance(“David”, “Jakob”));
\n\/\/ 4<\/p>\n

\u5c11\u4e8e5\u4f4d\u7684\u5c31\u752899\u53bb\u8865 \u76f4\u5230\u8865\u8db35\u4e3a
\nSystem.out.println(StringUtils.leftPad(“123”, 5, “99”));
\n\/\/99123<\/p>\n

———————————–\u65e5\u671f\u7684\u4f7f\u7528\uff1a
\nName\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Format<\/p>\n

ISO_DATE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-dd”2004-01-02″<\/p>\n

ISO_DATE_TIME_ZONE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-ddZZ”2004-01-02-07:00″<\/p>\n

ISO_DATETIME_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-dd’T’HH:mm:ss”2004-01-02T23:22:12″<\/p>\n

ISO_DATETIME_TIME_ZONE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-dd’T’HH:mm:ssZZ”2004-01-02T21:13:45-07:00″<\/p>\n

ISO_TIME_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ‘T’HH:mm:ss”T04:23:22″<\/p>\n

ISO_TIME_NO_T_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 HH:mm:ss”05:12:34″<\/p>\n

ISO_TIME_NO_T_TIME_ZONE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 HH:mm:ssZZ”12:32:22-07:00″<\/p>\n

ISO_TIME_TIME_ZONE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ‘T’HH:mm:ssZZ”T18:23:22-07:00″<\/p>\n

SMTP_DATETIME_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 EEE, dd MMM yyyy HH:mm:ss Z”Wed, 01 Feb 2004 20:03:01 CST”<\/p>\n

\u6bd4\u8f83\u4e24\u4e2a\u65e5\u671f\u6216\u8ba9\u65e5\u671f\u56db\u820d\u4e94\u5165
\nDate date1 = new Date();<\/p>\n

System.out.println(DateUtils.MILLIS_IN_SECOND
\n+ “The time right now is >>” + date1);<\/p>\n

Thread.currentThread().sleep(DateUtils.MILLIS_IN_SECOND);<\/p>\n

Date date2 = new Date();<\/p>\n

System.out.println(“Is Same Instant >> ”
\n+ DateUtils.isSameInstant(date1, date2));<\/p>\n

String[] dates = { “2005.03.24 11:03:26”, “2005-03-24 11:03”,
\n“2005\/03\/24” };<\/p>\n

System.out.println(“—-88——” + dates.length);<\/p>\n

System.out.println(“———-“);
\n\/\/ Display date in HH:mm:ss format
\nSystem.out.println(“Now >>”
\n+ DateFormatUtils.ISO_TIME_NO_T_FORMAT.format(System
\n.currentTimeMillis()));<\/p>\n

System.out.println(“Date after rounding >>”
\n+ DateUtils.round(date1, Calendar.HOUR));<\/p>\n

\/\/ Truncate the hour
\nSystem.out.println(“Date after truncation >>”
\n+ DateUtils.truncate(date1, Calendar.HOUR));<\/p>\n

\/\/\u8f93\u51fa\u7ed3\u679c\uff1a
\n1000The time right now is >>Thu Sep 08 18:37:32 CST 2011
\nIs Same Instant >> false
\n—-88——3<\/p>\n

\u4e00\u4e2a\u5e38\u7528\u7684\u65e5\u671f\uff1a
\nFastDateFormat formatter = FastDateFormat.getInstance(“yyyy-MM-dd HH:mm:ss”);<\/p>\n

String output = formatter.format( new Date( ) );<\/p>\n

System.out.println(output);
\n==\u300b2011-09-09 10:11:20
\n2011-09-09 13:19:11
\n————————————————————–
\nNow >>18:37:33
\nDate after rounding >>Thu Sep 08 19:00:00 CST 2011
\nDate after truncation >>Thu Sep 08 18:00:00 CST 2011<\/p>\n

——————————-
\nimport org.apache.commons.lang.builder.ToStringBuilder;
\ntoString :\u5728\u5c5e\u6027\u7c7b\u52a0\u4e86\u8fd9\u4e2a\u00a0 \u5728\u5176\u4ed6\u7c7b\u76f4\u63a5toString\u5c31\u53ef\u4ee5\u5566<\/p>\n

public String toString(){
\nreturn ToStringBuilder.reflectionToString(this);
\n}
\n————————————–
\nimport java.util.Collections;
\nimport org.apache.commons.lang.builder.CompareToBuilder;<\/p>\n

\u5bf9\u5bf9\u8c61\u6392\u5e8f\uff1a
\n1\u3001\u5e8f\u5217\u5316
\npublic class Stu implements Comparable{
\nprivate int id;
\nprivate String name;
\n2\u3001\u91cd\u5199\u8fd9\u4e2a\u65b9\u6cd5\uff1a
\npublic int compareTo(Object obj) {
\nStu anotherComputer = (Stu)obj;
\nreturn new CompareToBuilder().
\nappend(this.id, anotherComputer.id).toComparison();
\n}
\n3\u3001ArrayList a = new ArrayList();<\/p>\n

a.add(new Stu(234,”aer”,”sg”,”fgh”));
\na.add(new Stu(456,”dfgd”,”df”,”fgh”));
\na.add(new Stu(88,”ertr”,”hgh”,”gfhf”));
\nCollections.sort(a);
\nSystem.out.println(a);
\n—————————————————-
\n\u68c0\u67e5\u7a7a\u5b57\u7b26\u4e32\uff1a
\nStringUtils.isBlank(String str);
\nStringUtils.isNotBlank(String str);<\/p>\n

\u7f29\u5199\u5b57\u7b26\u4e32\uff1aabbreviate()\u53ef\u4ee5\u6309\u7167\u76ee\u6807\u957f\u5ea6\u7f29\u51cf\u5b57\u7b26\u4e32\uff0c\u82e5\u5c0f\u4e8e\u76ee\u6807\u957f\u5ea6\uff0c\u6700\u540e\u4e09\u4f4d\u5b57\u7b26\u4ee5”…”\u4ee3\u66ff
\n\u3010\u6ce8\u610f\u6709\u4e09\u4e2a…\u3011
\nString test = ” This is a test of the abbreviation. ”
\nSystem.out.println( StringUtils.abbreviate( test, 10 ) );<\/p>\n

[Console\u8f93\u51fa]
\nThis is…<\/p>\n

StringUtils.abbreviate(“How to abbreviate a string?”,9) -> How to…<\/p>\n

——————————
\n\u8ba1\u7b97\u5b57\u7b26\u4e32\u51fa\u73b0\u9891\u7387\uff1a
\n\u3010\u68c0\u6d4b\u5b57\u7b26\u4e32\u51fa\u73b0\u9891\u7387\u00a0 countMatches()\u3011<\/p>\n

File manuscriptFile = new File( ” manuscript.txt ” );<\/p>\n

Reader reader = new FileReader( manuscriptFile );<\/p>\n

StringWriter stringWriter = new StringWriter( );<\/p>\n

while ( reader.ready( ) ) { writer.write( reader.read( ) ); }<\/p>\n

String manuscript = stringWriter.toString( );<\/p>\n

\/\/ Convert string to lowercase<\/p>\n

manuscript = StringUtils.lowerCase(manuscript);<\/p>\n

\/\/ count the occurrences of “futility”<\/p>\n

int numFutility = StringUtils.countMatches( manuscript, ” futility ” );<\/p>\n

———————————–<\/p>\n

\u5224\u65ad\u7a7a\u5b57\u7b26\u4e32\uff0c\u7a7a\u683c\u53canull
\nisEmpty()\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u5b57\u7b26\u4e32\u6216null
\nisNotEmpty()==!isEmpty()
\nisBlank()\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u683c\uff0c\u7a7a\u5b57\u7b26\u4e32\u6216null
\nisNotBlank()==!isBlank()<\/p>\n

\u68c0\u6d4b\u5b57\u7b26\u4e32\u5185\u5bb9
\nisNumeric()\u5224\u65ad\u662f\u5426\u53ea\u5305\u542b0-9
\nisAlpha()\u5224\u65ad\u662f\u5426\u53ea\u5305\u542b\u5b57\u6bcd
\nisAlphanumeric()\u5224\u65ad\u662f\u5426\u53ea\u5305\u542b\u5b57\u6bcd\u548c\u6570\u5b57\u7684\u7ec4\u5408
\nisAlphaSpace()\u5224\u65ad\u662f\u5426\u53ea\u5305\u542b\u7a7a\u683c\u548c\u5b57\u6bcd<\/p>\n

substringBefore()\u6355\u83b7\u6307\u5b9a\u5b57\u7b26\u4e32\u4e4b\u524d\u7684\u5185\u5bb9
\nsubstringAfter()\u6355\u83b7\u6307\u5b9a\u5b57\u7b26\u4e32\u4e4b\u540e\u7684\u5185\u5bb9
\nsubstringBeforeLast()\u6355\u83b7\u6307\u5b9a\u5b57\u7b26\u4e32\u6700\u540e\u51fa\u73b0\u5904\u4e4b\u524d\u7684\u5185\u5bb9
\nsubstringAfterLast()\u6355\u83b7\u6307\u5b9a\u5b57\u7b26\u4e32\u6700\u540e\u51fa\u73b0\u5904\u4e4b\u540e\u7684\u5185\u5bb9
\nStringUtils.substringBetween(“[hello,heis]”,”[“,”]”) ->hello,heis<\/p>\n

difference(str1\uff0cstr2)\u8f93\u51fa\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u4e32\u4e0e\u7b2c\u4e00\u4e2a\u76f8\u5dee\u7684\u5b57\u7b26\u4e32
\nStringUtils.difference(“word”,”world”) ->ld<\/p>\n

\u53cd\u8f6c\u5b57\u7b26\u4e32\u548c\u53cd\u8f6c\u53e5\u5b50\u7684\u5355\u8bcd\u987a\u5e8f
\nreverse()
\nStringUtils.reverse(“I’m heis”) ->sieh m’I
\nStringUtils.reverseSentence(“I’m heis”) ->heis I’m<\/p>\n

\u8f93\u51fa\u4e24\u4e2a\u5b57\u7b26\u7f16\u8f91\u8ddd\u79bb\uff0c\u5373\u4e00\u4e2a\u5b57\u7b26\u4e32\u8981\u8f6c\u6362\u5230\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u9700\u8981\u63d2\u5165\uff0c\u5220\u9664\u548c\u66ff\u6362\u7684\u5b57\u7b26\u7684\u6b21\u6570\u3002
\ngetLevenshteinDistance(str1,str2)<\/p>\n

StringUtils.getLevenshteinDistance(“steve”,”stereo”) ->2
\nStringUtils.getLevenshteinDistance(“heis”,”hello”) ->3<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5de5\u4f5c\u5bb9\u6613\u9047\u5230\u7684\uff1a \u5fc5\u987b\u89818\u4f4d\uff0c\u4e0d\u591f\u7684\u5c31\u62ff0\u53bb\u8865 System.out.println(StringUtils.leftPad(“34”, 8, “0”)); \/\/ 00000034 \u53c8\u6216\u8005\u4f60\u9700\u8981\u5728\u4e00\u4e2a\u6570\u7ec4\u4e2d\u52a0\u5165\u4e00\u4e2a\u5143\u7d20\uff0c\u4f60\u53ef\u4ee5\u8fd9\u4e48\u505a\uff1a \u628a\u6570\u7ec4\u91cc\u7684\u5b57\u7b26\u4e32\u7528:\u8fde\u63a5 System.out.println(StringUtils.join(new String[]{“cat”,”dog”,”carrot”,”leaf”,”door”}, “:”) \/\/ cat:dog:carrot:leaf:door \u5982\u679c\u4f60\u9700\u8981\u4e00\u4e2a\u5927\u5199\u5b57\u6bcd\u6216\u8005\u662f\u9700\u8981\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e2a\u5355\u8bcd\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u5927\u5199\uff0c\u4f60\u53ef\u4ee5\u8fd9\u4e48\u505a\uff1a System.out.println(StringUtils.capitaliseAllWords(“a sentenced to be capitalised”)); \/\/ A Sentenced To Be Capitalised \u5982\u679c\u4f60\u9700\u8981\u8ba1\u7b97\u4e00\u4e2a\u5b57\u6bcd\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u4e2a\u6570\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528countMatches\u65b9\u6cd5\uff1a System.out.println(StringUtils.countMatches(“Bethany plays with army men”, “e”)); \/\/ 2 \u751a\u81f3\u8fd8\u6709\u8ba1\u7b97\u4e24\u5b57\u7b26\u4e32\u4e4b\u95f4\u7684Levenshtein-Distance System.out.println(StringUtils.getLevenshteinDistance(“David”, “Jakob”)); \/\/ 4 \u5c11\u4e8e5\u4f4d\u7684\u5c31\u752899\u53bb\u8865 \u76f4\u5230\u8865\u8db35\u4e3a System.out.println(StringUtils.leftPad(“123”, 5, “99”)); \/\/99123 ———————————–\u65e5\u671f\u7684\u4f7f\u7528\uff1a Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Format ISO_DATE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-dd”2004-01-02″ ISO_DATE_TIME_ZONE_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-ddZZ”2004-01-02-07:00″ ISO_DATETIME_FORMAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 yyyy-MM-dd’T’HH:mm:ss”2004-01-02T23:22:12″ … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-303","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts\/303","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=303"}],"version-history":[{"count":0,"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts\/303\/revisions"}],"wp:attachment":[{"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=303"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}