{"id":6865,"date":"2013-02-06T23:58:21","date_gmt":"2013-02-06T14:58:21","guid":{"rendered":"http:\/\/arison.jp\/blog\/?p=6865"},"modified":"2017-07-14T02:12:31","modified_gmt":"2017-07-13T17:12:31","slug":"java-stringutils-null-space-check","status":"publish","type":"post","link":"https:\/\/arison.jp\/blog\/2013\/02\/06\/java-stringutils-null-space-check\/","title":{"rendered":"\u3010Java\u3011null\u3084\u7a7a\u6587\u5b57\u3001\u7a7a\u767d\u6587\u5b57\u306e\u5165\u529b\u30c1\u30a7\u30c3\u30af"},"content":{"rendered":"

Apache Commons Lang\u306eStringUtils\u30af\u30e9\u30b9\u304c\u4fbf\u5229\u3002
\nnull\u3084\u7a7a\u6587\u5b57\u3001\u7a7a\u767d\u6587\u5b57\u306e\u5165\u529b\u30c1\u30a7\u30c3\u30af\u306b\u306fStringUtils\u3092\u5229\u7528\u3057\u3088\u3046\u3002<\/span><\/p>\n

\u3044\u3064\u3082\u3002isEmpty\u4f7f\u3046\u304bisBlank\u3067\u8ff7\u3046\u3002
\n\u5fc5\u9808\u5165\u529b\u9805\u76ee\u306a\u3089\u3001\u7a7a\u767d\u3092\u8a31\u53ef\u3059\u308b\u306a\u3089isEmpty\u3002
\n\u4e3b\u30ad\u30fc\u306e\u9805\u76ee\u306a\u3089\u3001\u7a7a\u767d\u6587\u5b57\u3092\u8a31\u53ef\u3057\u306a\u3044isBlank\u304c\u3044\u3044\u304b\u306a\u3002<\/p>\n

<\/p>\n

\n

isEmpty<\/h3>\n

public static boolean isEmpty(java.lang.String str)
\n\u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304cNULL\u3001\u307e\u305f\u306f\u7a7a\u6587\u5b57\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/span>
\n\u30d1\u30e9\u30e1\u30fc\u30bf: str \u2013 \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217
\n\u623b\u308a\u5024: \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304cNULL\u3001\u307e\u305f\u306f\u7a7a\u6587\u5b57\u306e\u5834\u5408\u306ftrue\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse<\/p>\n

StringUtils.isEmpty(null) \u306e\u5834\u5408 true
\nStringUtils.isEmpty(“”) \u306e\u5834\u5408 true
\nStringUtils.isEmpty(” “) \u306e\u5834\u5408 false
\nStringUtils.isEmpty(“\u3000”) \u306e\u5834\u5408 false
\nStringUtils.isEmpty(“hoge”) \u306e\u5834\u5408 false<\/p>\n

\n

isNotEmpty<\/h3>\n

public static boolean isNotEmpty(java.lang.String str)
\n\u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304cNULL\u3067\u306a\u3044\u3001\u304b\u3064\u7a7a\u6587\u5b57\u3067\u306a\u3044\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/span><\/p>\n

\u30d1\u30e9\u30e1\u30fc\u30bf: str \u2013 \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217
\n\u623b\u308a\u5024: \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304cNULL\u3067\u306a\u3044\u3001\u304b\u3064\u7a7a\u6587\u5b57\u3067\u306a\u3044\u5834\u5408\u306ftrue\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse<\/p>\n

StringUtils.isNotEmpty(null) \u306e\u5834\u5408 false
\nStringUtils.isNotEmpty(“”) \u306e\u5834\u5408 false
\nStringUtils.isNotEmpty(” “) \u306e\u5834\u5408 true
\nStringUtils.isNotEmpty(“\u3000”) \u306e\u5834\u5408 true
\nStringUtils.isNotEmpty(“hoge”) \u306e\u5834\u5408 true<\/p>\n

\n

isBlank<\/h3>\n

public static boolean isBlank(java.lang.String str)<\/p>\n

\u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304c\u7a7a\u767d\u6587\u5b57\uff08\u6ce81\uff09\u3001\u307e\u305f\u306f\u7a7a\u6587\u5b57\u3001\u307e\u305f\u306fNULL\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/span>
\n\u30d1\u30e9\u30e1\u30fc\u30bf: str \u2013 \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217
\n \u623b\u308a\u5024: \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304c\u7a7a\u767d\u6587\u5b57\u3001\u307e\u305f\u306f\u7a7a\u6587\u5b57\u3001\u307e\u305f\u306fNULL\u306e\u5834\u5408\u306ftrue\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse<\/p>\n

StringUtils.isBlank(null) \u306e\u5834\u5408 true
\nStringUtils.isBlank(“”) \u306e\u5834\u5408 true
\nStringUtils.isBlank(” “) \u306e\u5834\u5408 true
\nStringUtils.isBlank(“\u3000”) \u306e\u5834\u5408 true
\nStringUtils.isBlank(“hoge”) \u306e\u5834\u5408 false<\/p>\n

\n

isNotBlank<\/h3>\n

public static boolean isNotBlank(java.lang.String str)<\/p>\n

\u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304c\u7a7a\u767d\u6587\u5b57\uff08\u6ce81\uff09\u3067\u306a\u3044\u3001\u304b\u3064\u7a7a\u6587\u5b57\u3067\u306a\u3044\u3001\u304b\u3064NULL\u3067\u306a\u3044\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/span>
\n\u30d1\u30e9\u30e1\u30fc\u30bf: str \u2013 \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217
\n\u623b\u308a\u5024: \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304c\u7a7a\u767d\u6587\u5b57\u3067\u306a\u3044\u3001\u304b\u3064\u7a7a\u6587\u5b57\u3067\u306a\u3044\u3001\u304b\u3064NULL\u3067\u306a\u3044\u5834\u5408\u306ftrue\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse<\/p>\n

StringUtils.isNotBlank(null) \u306e\u5834\u5408 false
\nStringUtils.isNotBlank(“”) \u306e\u5834\u5408 false
\nStringUtils.isNotBlank(” “) \u306e\u5834\u5408 false
\nStringUtils.isNotBlank(“\u3000”) \u306e\u5834\u5408 false
\nStringUtils.isNotBlank(“hoge”) \u306e\u5834\u5408 true<\/p>\n

\n

\u6ce81\u3000\u7a7a\u767d\u6587\u5b57\u306fCharacter.isWhitespace\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u6587\u5b57\u5217\u306e\u3053\u3068\u3002
\n\u534a\u89d2\u30b9\u30da\u30fc\u30b9\u3001\u5168\u89d2\u30b9\u30da\u30fc\u30b9\u3092\u542b\u307f\u307e\u3059\u3002<\/p>\n

Character.isWhitespace(‘ ‘) \u306e\u5834\u5408 true
\nCharacter.isWhitespace(‘\u3000’) \u306e\u5834\u5408 true
\nCharacter.isWhitespace(‘\\r’) \u306e\u5834\u5408 true \u203bCARRIAGE RETURN
\nCharacter.isWhitespace(‘\\n’) \u306e\u5834\u5408 true \u203bLINE FEED
\nCharacter.isWhitespace(‘\\t’) \u306e\u5834\u5408 true \u203bHORIZONTAL TABULATION HT
\n\u3053\u3093\u306a\u66f8\u304d\u65b9\u3082\u3067\u304d\u307e\u3059\u3002
\nCharacter.isWhitespace(‘\\u0009’) \u306e\u5834\u5408 true \u203b\u3044\u308f\u3086\u308b\\t HORIZONTAL TABULATION HT
\nCharacter.isWhitespace(‘\\u000B’) \u306e\u5834\u5408 true \u203bVERTICAL TABULATION
\nCharacter.isWhitespace(‘\\u000C’) \u306e\u5834\u5408 true \u203b\u3044\u308f\u3086\u308b\\f FORM FEED FF
\nCharacter.isWhitespace(‘\\u001C’) \u306e\u5834\u5408 true \u203bFILE SEPARATOR
\nCharacter.isWhitespace(‘\\u001D’) \u306e\u5834\u5408 true \u203bGROUP SEPARATOR
\nCharacter.isWhitespace(‘\\u001E’) \u306e\u5834\u5408 true \u203bRECORD SEPARATOR
\nCharacter.isWhitespace(‘\\u001F’) \u306e\u5834\u5408 true \u203bUNIT SEPARATOR<\/p>\n

\n

\u304a\u307e\u3051<\/h3>\n

Character.isWhitespace(‘c’) \u306e\u5834\u5408 false
\nCharacter.isWhitespace() \u306e\u5834\u5408 \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff08\u5f15\u6570\u306a\u3057\uff09
\nCharacter.isWhitespace(”) \u306e\u5834\u5408 \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff08\u6587\u5b57\u5b9a\u6570\u7121\u52b9\uff09
\nCharacter.isWhitespace(‘hoge’) \u306e\u5834\u5408 \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff08\u6587\u5b57\u5217\u3060\u3057\uff09
\nCharacter.isWhitespace(‘\\b’) \u306e\u5834\u5408 false \u203b\u3044\u308f\u3086\u308b\\b backspace BS
\nCharacter.isWhitespace(‘\\u0008’) \u306e\u5834\u5408 false \u203b\u3044\u308f\u3086\u308b\\b backspace BS
\nCharacter.isWhitespace(‘ ‘\\u000A\\u000D)) \u2026CARRIAGE RETURN\u3068LINE FEED\uff08\u7b11\uff09\u203b\u3044\u308f\u3086\u308b\\r\\n<\/p>\n

CR LF\u306fisWhitespace\u3067\u6bd4\u8f03\u3067\u304d\u306a\u304b\u3063\u305f\u3002<\/p>\n

\u3010\u7a7a\u767d\u6587\u5b57\u306e\u53c2\u8003\u30b5\u30a4\u30c8\u3011
\nCharacter (Java Platform SE 6)
\nhttp:\/\/docs.oracle.com\/javase\/jp\/6\/api\/java\/lang\/Character.html#isWhitespace(char)<\/p>\n

\n

\u6307\u5b9a\u3055\u308c\u305f\u6587\u5b57\u304c Java \u306e\u57fa\u6e96\u306b\u5f93\u3063\u305f\u7a7a\u767d\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002\u6b21\u306e\u57fa\u6e96\u306e\u3069\u308c\u304b\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u3060\u3051\u3001Java \u306e\u7a7a\u767d\u6587\u5b57\u306b\u306a\u308a\u307e\u3059\u3002
\n\u2022Unicode \u306e\u7a7a\u767d\u6587\u5b57 (SPACE_SEPARATOR\u3001LINE_SEPARATOR\u3001\u307e\u305f\u306f PARAGRAPH_SEPARATOR) \u3067\u3042\u308b\u304c\u3001\u975e\u533a\u5207\u308a\u30b9\u30da\u30fc\u30b9 (‘\\u00A0’\u3001’\\u2007’\u3001’\\u202F’) \u3067\u306f\u306a\u3044
\n\u2022’\\u0009’\u3001HORIZONTAL TABULATION \u3067\u3042\u308b
\n\u2022’\\u000A’\u3001LINE FEED \u3067\u3042\u308b
\n\u2022’\\u000B’\u3001VERTICAL TABULATION \u3067\u3042\u308b
\n\u2022’\\u000C’\u3001FORM FEED \u3067\u3042\u308b
\n\u2022’\\u000D’\u3001CARRIAGE RETURN \u3067\u3042\u308b
\n\u2022’\\u001C’\u3001FILE SEPARATOR \u3067\u3042\u308b
\n\u2022’\\u001D’\u3001GROUP SEPARATOR \u3067\u3042\u308b
\n\u2022’\\u001E’\u3001RECORD SEPARATOR \u3067\u3042\u308b
\n\u2022’\\u001F’\u3001UNIT SEPARATOR \u3067\u3042\u308b<\/p>\n

\n

\u3010\u53c2\u8003\u30b5\u30a4\u30c8\u3011
\nApache Commons Lang \u2013 StringUtils\uff08IsEmpty – IsBlank\uff09 TK Factory
\nhttp:\/\/tk-factory.net\/wordpress\/?p=1429<\/a><\/p>\n

2009-04-22 – \u502d\u30de\u30f3\u65e5\u8a18\u3000Java \u3068 XML \u3068\u7a7a\u767d\u3068 (2) : \u6b63\u898f\u8868\u73fe
\nhttp:\/\/d.hatena.ne.jp\/waman\/20090422<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Apache Commons Lang\u306eStringUtils\u30af\u30e9\u30b9\u304c\u4fbf\u5229\u3002 null\u3084\u7a7a\u6587\u5b57\u3001\u7a7a\u767d\u6587\u5b57\u306e\u5165\u529b\u30c1\u30a7\u30c3\u30af\u306b\u306fStringUtils\u3092\u5229\u7528\u3057\u3088\u3046\u3002 \u3044\u3064\u3082\u3002isEmpty\u4f7f\u3046\u304bisBlank\u3067\u8ff7\u3046\u3002 \u5fc5\u9808\u5165\u529b […]<\/p>\n","protected":false},"author":2,"featured_media":17178,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,4],"tags":[703,119],"class_list":["post-6865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming","category-diary","tag-java","tag-coding"],"_links":{"self":[{"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/posts\/6865","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/comments?post=6865"}],"version-history":[{"count":0,"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/posts\/6865\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/media\/17178"}],"wp:attachment":[{"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/media?parent=6865"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/categories?post=6865"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arison.jp\/blog\/wp-json\/wp\/v2\/tags?post=6865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}