{"id":2797,"date":"2023-04-25T14:17:43","date_gmt":"2023-04-25T06:17:43","guid":{"rendered":"https:\/\/hsin-life.com\/?p=2797"},"modified":"2023-04-25T14:17:43","modified_gmt":"2023-04-25T06:17:43","slug":"java%e4%b8%ad%e7%9a%84stringutils%e5%b7%a5%e5%85%b7%e9%a1%9e%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/hsin-life.com\/archives\/2797","title":{"rendered":"Java\u4e2d\u7684StringUtils\u5de5\u5177\u985e\u8a73\u89e3"},"content":{"rendered":"\n

StringUtils\u5de5\u5177\u985e\u662f\u5c0djava.lang.String\u985e\u578b\u7684\u5c0d\u8c61\u9032\u884c\u64cd\u4f5c\u7684\u4e00\u500b\u88dc\u5145\uff0c\u63d0\u4f9b\u4e86130\u591a\u500b\u64cd\u4f5c\u65b9\u6cd5\uff0c\u4e26\u4e14\u662fnull\u5b89\u5168\u7684\u3002<\/p>\n\n\n\n

\u5b83\u7684\u65b9\u6cd5\u90fd\u662fstatic\u7684\uff0c\u56e0\u6b64\u6211\u5011\u53ef\u4ee5\u76f4\u63a5\u8abf\u7528StringUtils.xxx()\u3002<\/p>\n\n\n\n

\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u65b9\u6cd5\u7684\u4ecb\u7d39\uff1a<\/p>\n\n\n\n

    \n
  1. isEmpty(String str)\uff1a\u5224\u65b7\u67d0\u5b57\u7b26\u4e32\u662f\u5426\u70ba\u7a7a\uff0c\u70ba\u7a7a\u7684\u6a19\u6e96\u662fstr==null\u6216str.length()==0\u3002StringUtils.isEmpty(” “)\u6703\u8fd4\u56defalse\uff0c\u56e0\u70ba\u5728StringUtils\u4e2d\u7a7a\u683c\u88ab\u8996\u70ba\u975e\u7a7a\u3002<\/li>\n\n\n\n
  2. isNotEmpty(String str)\uff1a\u5224\u65b7\u67d0\u5b57\u7b26\u4e32\u662f\u5426\u975e\u7a7a\uff0c\u7b49\u65bc!isEmpty(String str)\u3002StringUtils.isNotEmpty(” “)\u6703\u8fd4\u56detrue\u3002<\/li>\n\n\n\n
  3. isBlank(String str)\uff1a\u5224\u65b7\u67d0\u5b57\u7b26\u4e32\u662f\u5426\u70ba\u7a7a\u6216\u9577\u5ea6\u70ba0\u6216\u7531\u7a7a\u767d\u7b26(whitespace)\u69cb\u6210\u3002StringUtils.isBlank(“\\t \\n \\f \\r”)\u6703\u8fd4\u56detrue\uff0c\u56e0\u70ba\u5236\u8868\u7b26\u3001\u63db\u884c\u7b26\u3001\u63db\u9801\u7b26\u548c\u56de\u8eca\u7b26\u90fd\u88ab\u8b58\u5225\u70ba\u7a7a\u767d\u7b26\u3002<\/li>\n\n\n\n
  4. isNotBlank(String str)\uff1a\u5224\u65b7\u67d0\u5b57\u7b26\u4e32\u662f\u5426\u4e0d\u70ba\u7a7a\u4e14\u9577\u5ea6\u4e0d\u70ba0\u4e14\u4e0d\u7531\u7a7a\u767d\u7b26(whitespace)\u69cb\u6210\uff0c\u7b49\u65bc!isBlank(String str)\u3002<\/li>\n\n\n\n
  5. trim(String str)\uff1a\u53bb\u6389\u5b57\u7b26\u4e32\u5169\u7aef\u7684\u63a7\u5236\u7b26(control characters, char <= 32)\uff0c\u5982\u679c\u8f38\u5165\u70banull\u5247\u8fd4\u56denull\u3002StringUtils.trim(” \\n\\tss \\b”)\u6703\u8fd4\u56de”ss”\u3002<\/li>\n\n\n\n
  6. trimToNull(String str)\uff1a\u53bb\u6389\u5b57\u7b26\u4e32\u5169\u7aef\u7684\u63a7\u5236\u7b26(control characters, char <= 32)\uff0c\u5982\u679c\u8b8a\u70banull\u6216””\uff0c\u5247\u8fd4\u56denull\u3002<\/li>\n\n\n\n
  7. trimToEmpty(String str)\uff1a\u53bb\u6389\u5b57\u7b26\u4e32\u5169\u7aef\u7684\u63a7\u5236\u7b26(control characters, char <= 32)\uff0c\u5982\u679c\u8b8a\u70banull\u6216””\uff0c\u5247\u8fd4\u56de””\u3002<\/li>\n\n\n\n
  8. strip(String str)\uff1a\u53bb\u6389\u5b57\u7b26\u4e32\u5169\u7aef\u7684\u7a7a\u767d\u7b26(whitespace)\uff0c\u5982\u679c\u8f38\u5165\u70banull\u5247\u8fd4\u56denull\u3002StringUtils.strip(” \\n\\tss \\b”)\u6703\u8fd4\u56de”ss \\b”\u3002<\/li>\n\n\n\n
  9. stripToNull(String str)\uff1a\u53bb\u6389\u5b57\u7b26\u4e32\u5169\u7aef\u7684\u7a7a\u767d\u7b26(whitespace)\uff0c\u5982\u679c\u8b8a\u70banull\u6216””\uff0c\u5247\u8fd4\u56denull\u3002<\/li>\n\n\n\n
  10. stripToEmpty(String str)\uff1a\u53bb\u6389\u5b57\u7b26\u4e32\u5169\u7aef\u7684\u7a7a\u767d\u7b26(whitespace)\uff0c\u5982\u679c\u8b8a\u70banull\u6216””\uff0c\u5247\u8fd4\u56de””\u3002<\/li>\n<\/ol>\n\n\n\n

    \u901a\u904e\u4e0a\u8ff0\u65b9\u6cd5\u7684\u4ecb\u7d39\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u51faStringUtils\u5de5\u5177\u985e\u5728\u5b57\u7b26\u4e32\u64cd\u4f5c\u65b9\u9762\u63d0\u4f9b\u4e86\u8c50\u5bcc\u7684\u529f\u80fd\uff0c\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\u3002<\/p>\n\n\n\n

    \u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u5834\u666f\u4e0bStringUtils\u65b9\u6cd5\u7684\u4f7f\u7528\uff1a<\/p>\n\n\n\n

      \n
    1. \u5728\u8b80\u53d6\u5916\u90e8\u6578\u64da\u6642\uff0c\u901a\u5e38\u6703\u9047\u5230\u5b57\u7b26\u4e32\u7684\u7a7a\u503c\u5224\u65b7\u3002\u4f7f\u7528StringUtils.isEmpty()\u6216StringUtils.isNotBlank()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u6aa2\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u70ba\u7a7a\u6216\u975e\u7a7a\uff0c\u907f\u514d\u4e86null\u503c\u5c0e\u81f4\u7684NullPointerException\u3002<\/li>\n\n\n\n
    2. \u5728\u8655\u7406\u7528\u6236\u8f38\u5165\u7684\u6578\u64da\u6642\uff0c\u53ef\u80fd\u9700\u8981\u5c0d\u5b57\u7b26\u4e32\u9032\u884c\u524d\u5f8c\u7a7a\u767d\u5b57\u7b26\u7684\u6e05\u7406\u3002\u4f7f\u7528StringUtils.trim()\u3001StringUtils.strip()\u3001StringUtils.trimToNull()\u548cStringUtils.stripToNull()\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u9078\u64c7\u9069\u7576\u7684\u65b9\u6cd5\u9032\u884c\u64cd\u4f5c\u3002<\/li>\n\n\n\n
    3. \u5728\u6bd4\u8f03\u5169\u500b\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528StringUtils.equals()\u65b9\u6cd5\uff0c\u5b83\u540c\u6a23\u662fnull\u5b89\u5168\u7684\uff0c\u907f\u514d\u4e86NullPointerException\u3002<\/li>\n\n\n\n
    4. \u5728\u9700\u8981\u5c07\u5b57\u7b26\u4e32\u9032\u884c\u5206\u5272\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528StringUtils.split()\u65b9\u6cd5\uff0c\u5b83\u652f\u6301\u591a\u7a2e\u5206\u5272\u7b26\uff0c\u4e26\u4e14\u53ef\u4ee5\u6307\u5b9a\u5206\u5272\u7684\u6700\u5927\u6578\u91cf\u3002<\/li>\n\n\n\n
    5. \u7576\u9700\u8981\u5c07\u591a\u500b\u5b57\u7b26\u4e32\u9032\u884c\u62fc\u63a5\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528StringUtils.join()\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u6307\u5b9a\u5206\u9694\u7b26\uff0c\u4e26\u4e14\u53ef\u4ee5\u63a5\u53d7\u4e0d\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u53c3\u6578\u3002<\/li>\n<\/ol>\n\n\n\n

      \u7e3d\u7d50\uff1aStringUtils\u5de5\u5177\u985e\u5728Java\u958b\u767c\u4e2d\u8d77\u8457\u975e\u5e38\u91cd\u8981\u7684\u4f5c\u7528\uff0c\u5b83\u63d0\u4f9b\u4e86\u8a31\u591a\u65b9\u4fbf\u3001\u5be6\u7528\u4e14\u5b89\u5168\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u65b9\u6cd5\uff0c\u5927\u5927\u63d0\u9ad8\u4e86\u958b\u767c\u6548\u7387\u3002<\/p>\n\n\n\n

      \u4f5c\u70ba\u4e00\u540dJava\u958b\u767c\u8005\uff0c\u638c\u63e1StringUtils\u7684\u7528\u6cd5\u5c07\u5c0d\u6211\u5011\u7684\u958b\u767c\u5de5\u4f5c\u5e36\u4f86\u5f88\u5927\u7684\u5e6b\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u672c\u6587\u5c07\u5c0dJava\u4e2d\u7684StringUtils\u5de5\u5177\u985e\u9032\u884c\u8a73\u7d30\u4ecb\u7d39\uff0c\u95e1\u8ff0\u5176\u65b9\u6cd5\u8207\u7528\u9014\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5e38\u7528\u65b9\u6cd5\u7684\u793a\u4f8b\u3002<\/p>\n","protected":false},"author":1,"featured_media":2798,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[145],"tags":[87,692,690,693,691],"aioseo_notices":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/hsin-life.com\/wp-content\/uploads\/2023\/04\/pexels-photo-270348-5.jpeg?fit=1880%2C1011&ssl=1","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts\/2797"}],"collection":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/comments?post=2797"}],"version-history":[{"count":0,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts\/2797\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/media\/2798"}],"wp:attachment":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/media?parent=2797"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/categories?post=2797"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/tags?post=2797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}