{"id":575,"date":"2022-03-03T17:31:04","date_gmt":"2022-03-03T09:31:04","guid":{"rendered":"https:\/\/22pig.com\/?p=575"},"modified":"2022-03-03T17:31:04","modified_gmt":"2022-03-03T09:31:04","slug":"javaapache-commons","status":"publish","type":"post","link":"http:\/\/22pig.com\/?p=575","title":{"rendered":"[Java]apache commons"},"content":{"rendered":"

1\u3001IOUtils<\/h1>\n

org.apache.commons.io.IOUtils\uff0c\u64cd\u4f5c IO \u6d41\u7684\u5de5\u5177\u7c7b\uff0c\u4e0b\u9762\u662f\u5176\u5e38\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n

\/\/1\uff0e\u8bfb\u53d6Stream  <\/span>\nIOUtils<\/span>.toString<\/span>( InputStream )\n\/\/2. \u5173\u95ed\u6d41<\/span>\nIOUtils<\/span>.closeQuietly<\/span>(in);\n\/\/3. \u5199\u5165\u5230\u6d41<\/span>\nIOUtils<\/span>.write<\/span>(\"\u6c89\u9ed8\u738b\u4e8c\"<\/span>, response.getOutputStream(), \"UTF-8\"<\/span>);\n<\/code><\/pre>\n
2\u3001FileUtils<\/h1>\n
org.apache.commons.io.FileUtils\uff0c\u64cd\u4f5c\u6587\u4ef6\u6216\u8005\u76ee\u5f55\u7684\u5de5\u5177\u7c7b<\/p>\n
\/\/1. \u8bfb\u53d6\u6587\u4ef6<\/span>\nList lines = FileUtils.readLines(file, \"UTF-8\"<\/span>);  \n\/\/2. \u5220\u9664\u76ee\u5f55<\/span>\nFileUtils.deleteDirectory(file);\n\/\/3. \u8bfb\u53d6\u6587\u4ef6<\/span>\nString<\/span> str<\/span> = FileUtils.readFileToString(file);\n\/\/4. \u6587\u4ef6\u590d\u5236<\/span>\nFileUtils.copyFile(source, dest);\n\/\/5. \u5199\u5165\u6587\u4ef6<\/span>\nFileUtils.writeStringToFile(file, txt, Charset.forName(\"utf-8\"<\/span>))\n\/\/6. \u5f3a\u5236\u5220\u9664\u6587\u4ef6\u6216\u8005\u76ee\u5f55\u53ca\u5176\u6240\u6709\u5b50\u76ee\u5f55\u548c\u6587\u4ef6<\/span>\nFileUtils.forceDelete(tmpFile);\n          <\/code><\/pre>\n
3\u3001BeanUtils<\/strong><\/h2>\n
\/\/1. \u514b\u9686\u5bf9\u8c61<\/span>\nPerson person2 =  (Person)BeanUtils.cloneBean(person);  \n\/\/2. \u5c06\u4e00\u4e2aMap\u5bf9\u8c61\u8f6c\u5316\u4e3a\u4e00\u4e2aBean  <\/span>\nBeanUtils.populate(person,map<\/span>);  \n\/\/3. \u5c06\u4e00\u4e2aBean\u8f6c\u5316\u4e3a\u4e00\u4e2aMap\u5bf9\u8c61<\/span>\nMap map<\/span> = BeanUtils.describe(person)\n\/\/4. \u62f7\u8d1d\u6240\u6709\u5c5e\u6027<\/span>\nBeanUtils.copyProperties(u, user);\n\/\/5. \u8fd4\u56de bean \u6307\u5b9a\u7684\u5c5e\u6027\u503c<\/span>\nBeanUtils.getProperty(obj, fieldName);\n\/\/6. \u8bbe\u7f6e bean \u6307\u5b9a\u7684\u5c5e\u6027\u503c<\/span>\nBeanUtils.setProperty(obj, propertyName, value);<\/code><\/pre>\n
4\u3001Lang \u5305\u542b<\/strong>StringUtils\u3001ArrayUtils\u3001ClassUtils\u3001NumberUtils<\/p>\n
\/\/1. \u5408\u5e76\u4e24\u4e2a\u6570\u7ec4<\/span>\nArrayUtils<\/span>.addAll<\/span>(ary1, ary2);\n\/\/2. \u6307\u5b9a\u5b57\u7b26\u622a\u53d6\u5b57\u7b26\u4e32<\/span>\nStringUtils<\/span>.substringAfter<\/span>(\"my name is li lei\"<\/span>, \"name\"<\/span>);\n\/\/3. \u5224\u65ad\u8be5\u5b57\u7b26\u4e32\u662f\u4e0d\u662f\u4e3a\u6570\u5b57(0~9)\u7ec4\u6210<\/span>\nStringUtils<\/span>.isNumeric<\/span>(\"12\"<\/span>);\n\/\/4. \u68c0\u67e5\u5b57\u7b26\u662f\u5426\u4e3a\u7a7a\u5b57\u7b26\u4e32<\/span>\nStringUtils<\/span>.isBlank<\/span>(name)\n\/\/5. \u5c06\u591a\u4e2a\u5143\u7d20\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32<\/span>\nStringUtils<\/span>.join<\/span>(list,\",\"<\/span>);\n\/\/6. \u628a\u5b57\u7b26\u4e32\u62c6\u5206\u4e3a\u6570\u7ec4<\/span>\nStringUtils<\/span>.split<\/span>(str,\",\"<\/span>)\n\/\/7. \u5b57\u7b26\u66ff\u6362<\/span>\nStringUtils<\/span>.replace<\/span>(str,\",\"<\/span>,\";\"<\/span>)\n\/\/8. \u5728\u53f3\u8fb9\u52a0\u4e0b\u5b57\u7b26<\/span>\nStringUtils<\/span>.rightPad<\/span>(\"abc\"<\/span>, 6<\/span>, '*'<\/span>)\n\/\/9. \u9996\u5b57\u6bcd\u5927\u5199<\/span>\nStringUtils<\/span>.capitalize<\/span>(\"abc\"<\/span>)\n\/\/10. \u5224\u65ad\u662f\u5426\u5305\u542b\u8fd9\u4e2a\u5b57\u7b26  <\/span>\nStringUtils<\/span>.contains<\/span>(\"abc\"<\/span>, \"a\"<\/span>)    \n\/\/11.\u5728\u5de6\u8fb9\u52a0\u4e0b\u5b57\u7b26<\/span>\nStringUtils<\/span>.left<\/span>(\"abc\"<\/span>, 2<\/span>)\n\/\/12. \u53d6\u5f97\u7c7b\u540d <\/span>\nClassUtils<\/span>.getShortClassName<\/span>(Test.class)\n\/\/13. \u53d6\u5f97\u5176\u5305\u540d <\/span>\nClassUtils<\/span>.getPackageName<\/span>(Test.class)\n\/\/14. \u8f6c\u5316\u6210\u6570\u5b57<\/span>\nNumberUtils<\/span>.stringToInt<\/span>(\"6\"<\/span>)<\/code><\/pre>\n
5\u3001DigestUtils<\/h1>\n
org.apache.commons.codec.digest.DigestUtils\uff0c\u52a0\u5bc6\u7684\u5de5\u5177\u7c7b<\/p>\n
\/\/1. \u8ba1\u7b97\u5b57\u7b26\u4e32\u7684 MD5 \u6458\u8981<\/span>\nDigestUtils<\/span>.md5Hex<\/span>(\"abcd\"<\/span>)\n\/\/2. \u8ba1\u7b97\u5b57\u7b26\u4e32\u7684 MD5 \u6458\u8981\uff0c<\/span>\nDigestUtils<\/span>.md5<\/span>(\"abc\"<\/span>);\n<\/code><\/pre>\n
6\u3001Collections<\/h1>\n
\u96c6\u5408\u64cd\u4f5c\u7684\u5e38\u7528\u7c7b<\/p>\n
\/\/1. \u5224\u65ad\u662f\u5426\u4e3a\u7a7a<\/span>\nCollectionUtils<\/span>.isEmpty<\/span>(list)\n\/\/2. \u5f97\u5230\u4e24\u4e2a\u96c6\u5408\u4e2d\u76f8\u540c\u7684\u5143\u7d20<\/span>\nCollectionUtils<\/span>.retainAll<\/span>(list1, list2);\n\/\/3. \u5305\u542b<\/span>\nCollectionUtils<\/span>.containsAny<\/span>(list1, list2);<\/code><\/pre>\n
7\u3001\u5176\u4ed6\u5de5\u5177\u7c7b<\/h1>\n
    \n
  1. Compress\uff1ajava\u63d0\u4f9b\u6587\u4ef6\u6253\u5305 \u538b\u7f29\u7c7b\u5e93.<\/li>\n
  2. Configuration\uff1a\u4e00\u4e2ajava\u5e94\u7528\u7a0b\u5e8f\u7684\u914d\u7f6e\u7ba1\u7406\u7c7b\u5e93<\/li>\n
  3. DbUtils\uff1a\u63d0\u4f9b\u5bf9jdbc \u7684\u64cd\u4f5c\u5c01\u88c5\u6765\u7b80\u5316\u6570\u636e\u67e5\u8be2\u548c\u8bb0\u5f55\u8bfb\u53d6\u64cd\u4f5c<\/li>\n
  4. Validator\uff1a\u63d0\u4f9b\u4e86\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u7684\u6570\u636e\u9a8c\u8bc1\u6846\u67b6<\/li>\n
  5. FileUpload\uff1a\u63d0\u4f9b\u6587\u4ef6\u4e0a\u4f20\u529f\u80fd<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
    1\u3001IOUtils org.apache.commons.io.IOUtils\uff0c\u64cd\u4f5c IO \u6d41\u7684\u5de5\u5177\u7c7b\uff0c\u4e0b\u9762\u662f\u5176\u5e38\u7528\u7684\u65b9\u6cd5\u3002 \/\/1\uff0e\u8bfb\u53d6Stream IOUtils.toString( InputStream ) \/\/2. \u5173\u95ed\u6d41 IOUtils.closeQuietly(in); \/\/3. \u5199\u5165\u5230\u6d41 IOUtils.write(“\u6c89\u9ed8\u738b\u4e8c”, response.getOutputStream(), “UTF-8”); 2\u3001FileUtils org.apache.commons.io.FileUtils\uff0c\u64cd\u4f5c\u6587\u4ef6\u6216\u8005\u76ee\u5f55\u7684\u5de5\u5177\u7c7b \/\/1. \u8bfb\u53d6\u6587\u4ef6 List lines = FileUtils.readLines(file, “UTF-8”); \/\/2. \u5220\u9664\u76ee\u5f55 FileUtils.deleteDirectory(file); \/\/3. \u8bfb\u53d6\u6587\u4ef6 String str = FileUtils.readFileToString(file); \/\/4. \u6587\u4ef6\u590d\u5236 FileUtils.copyFile(source, dest); \/\/5. \u5199\u5165\u6587\u4ef6 FileUtils.writeStringToFile(file, txt, Charset.forName(“utf-8”)) \/\/6. \u5f3a\u5236\u5220\u9664\u6587\u4ef6\u6216\u8005\u76ee\u5f55\u53ca\u5176\u6240\u6709\u5b50\u76ee\u5f55\u548c\u6587\u4ef6 FileUtils.forceDelete(tmpFile); 3\u3001BeanUtils \/\/1. \u514b\u9686\u5bf9\u8c61 Person person2 = (Person)BeanUtils.cloneBean(person); \/\/2. \u5c06\u4e00\u4e2aMap\u5bf9\u8c61\u8f6c\u5316\u4e3a\u4e00\u4e2aBean … 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-575","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts\/575","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=575"}],"version-history":[{"count":0,"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts\/575\/revisions"}],"wp:attachment":[{"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=575"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}