{"id":31553,"date":"2023-05-18T09:49:33","date_gmt":"2022-11-15T19:19:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e3%82%b9%e3%82%af%e3%83%a9%e3%83%83%e3%83%81%e3%81%af%e3%80%81%e6%b1%8e%e7%94%a8%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0%e8%a8%80%e8%aa%9ejava%e3%82%92%e4%bd%bf%e7%94%a8\/"},"modified":"2024-04-30T04:46:22","modified_gmt":"2024-04-29T20:46:22","slug":"java%e3%82%b9%e3%82%af%e3%83%a9%e3%83%83%e3%83%81%e3%81%af%e3%80%81%e6%b1%8e%e7%94%a8%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0%e8%a8%80%e8%aa%9ejava%e3%82%92%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e3%82%b9%e3%82%af%e3%83%a9%e3%83%83%e3%83%81%e3%81%af%e3%80%81%e6%b1%8e%e7%94%a8%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0%e8%a8%80%e8%aa%9ejava%e3%82%92%e4%bd%bf%e7%94%a8\/","title":{"rendered":"Java\u30b9\u30af\u30e9\u30c3\u30c1\u306f\u3001\u6c4e\u7528\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9eJava\u3092\u4f7f\u7528\u3057\u305f\u958b\u767a\u65b9\u6cd5\u3067\u3042\u308b"},"content":{"rendered":"

\u76f4\u64ad<\/h2>\n
        List<\/span><<\/span>Integer<\/span>><\/span> integerList<\/span> =<\/span> Arrays<\/span>.<\/span>asList<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>);<\/span>\r\n        \/**\r\n         *  filter\r\n         *\/<\/span>\r\n        integerList<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>i<\/span> -><\/span> i<\/span> %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span> \/\/ \u4e2d\u9593\u64cd\u4f5c<\/span>\r\n        .<\/span>peek<\/span>(<\/span>i<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"-\"<\/span> +<\/span> i<\/span>))<\/span> \/\/ Debug\u7528<\/span>\r\n        .<\/span>forEach<\/span>(<\/span>i<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"@\"<\/span> +<\/span> i<\/span>));<\/span> \/\/ \u7d42\u7aef\u64cd\u4f5c<\/span>\r\n        \/\/ -2@2-4@4<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>();<\/span>\r\n\r\n\r\n        \/**\r\n         * map T -> U\r\n         *\/<\/span>\r\n        integerList<\/span>.<\/span>stream<\/span>().<\/span>map<\/span>(<\/span>i<\/span> -><\/span> i<\/span> *<\/span> 2<\/span>)<\/span> \/\/ \u4e2d\u9593\u64cd\u4f5c<\/span>\r\n        .<\/span>forEach<\/span>(<\/span>i<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>i<\/span> +<\/span> \" \"<\/span>));<\/span> \/\/ \u7d42\u7aef\u64cd\u4f5c<\/span>\r\n        \/\/ 2 4 6 8 10<\/span>\r\n<\/code><\/pre>\n
\u91cd\u65b0\u7ec4\u7ec7List\u3002<\/h3>\n
List<\/span><<\/span>JobTable<\/span>><\/span> jobTable<\/span> =<\/span> jobList<\/span>.<\/span>stream<\/span>()<\/span>\r\n        .<\/span>map<\/span>(<\/span>job<\/span> -><\/span> new<\/span> JobTable<\/span>(<\/span>job<\/span>.<\/span>getId<\/span>(),<\/span> job<\/span>.<\/span>getProcessname<\/span>()))<\/span>\r\n        .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n\r\nMap<\/span><<\/span>Integer<\/span>,<\/span> List<\/span><<\/span>Movie<\/span>>><\/span> myListmovieMap<\/span> =<\/span> myListMove<\/span>.<\/span>stream<\/span>().<\/span>collect<\/span>(<\/span>\r\n        Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>Movie:<\/span>:<\/span>getCategory<\/span>)<\/span>\r\n    );<\/span>\r\n\r\nMap<\/span><<\/span>Integer<\/span>,<\/span> Movie<\/span>><\/span> movieMap<\/span> =<\/span> myListMove<\/span>.<\/span>stream<\/span>().<\/span>collect<\/span>(<\/span>\r\n        Collectors<\/span>.<\/span>toMap<\/span>(<\/span>Movie:<\/span>:<\/span>getTitleNo<\/span>,<\/span> e<\/span> -><\/span> e<\/span>)<\/span>\r\n    );<\/span>\r\n\r\nList<\/span><<\/span>Movie<\/span>><\/span> newMovies<\/span> =<\/span> movies<\/span>.<\/span>stream<\/span>()<\/span>\r\n        .<\/span>filter<\/span>(<\/span>e<\/span> -><\/span> !<\/span>myListmovieMap<\/span> .<\/span>containsKey<\/span>(<\/span>e<\/span>.<\/span>getTitleNo<\/span>()))<\/span>\r\n        .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n\r\n<\/code><\/pre>\n
for<\/span>(<\/span>Map<\/span>.<\/span>Entry<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> entry<\/span> :<\/span> map<\/span>.<\/span>entrySet<\/span>())<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>entry<\/span>.<\/span>getKey<\/span>());<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>entry<\/span>.<\/span>getValue<\/span>());<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5c06\u4e24\u4e2a Map \u7684\u503c\u5408\u5e76\u6210\u4e00\u4e2a List\u3002<\/h3>\n
List<\/span><<\/span>Foo<\/span>><\/span> allUniqueTypeReports<\/span> =<\/span> Stream<\/span>.<\/span>of<\/span>(<\/span>map1<\/span>.<\/span>values<\/span>(),<\/span> map2<\/span>.<\/span>values<\/span>()).<\/span>flatMap<\/span>(<\/span>m<\/span> -><\/span> m<\/span>.<\/span>stream<\/span>())<\/span>\r\n                   .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u5bf9\u5730\u56fe\u8fdb\u884c\u6392\u5e8f<\/h3>\n
@Data<\/span>\r\n@AllArgsConstructor<\/span>\r\npublic<\/span> class<\/span> Person<\/span> {<\/span>\r\n    private<\/span> int<\/span> categoryId<\/span>;<\/span>\r\n    private<\/span> int<\/span> no<\/span>;<\/span>\r\n}<\/span>\r\n\r\npublic<\/span> void<\/span> sortTest<\/span>()<\/span> {<\/span>\r\n    Person<\/span> p11<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>1<\/span>,<\/span>1<\/span>);<\/span>\r\n    Person<\/span> p12<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>1<\/span>,<\/span>2<\/span>);<\/span>\r\n    Person<\/span> p21<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>2<\/span>,<\/span>1<\/span>);<\/span>\r\n    Person<\/span> p22<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>2<\/span>,<\/span>2<\/span>);<\/span>\r\n\r\n    List<\/span><<\/span>Person<\/span>><\/span> persons<\/span> =<\/span> Lists<\/span>.<\/span>newArrayList<\/span>(<\/span>p12<\/span>,<\/span> p11<\/span>,<\/span> p22<\/span>,<\/span> p21<\/span>);<\/span>\r\n    Map<\/span><<\/span>Integer<\/span>,<\/span> List<\/span><<\/span>Person<\/span>>><\/span> personMap<\/span> =<\/span> persons<\/span>.<\/span>stream<\/span>()<\/span>\r\n            .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>Person:<\/span>:<\/span>getCategoryId<\/span>));<\/span>\r\n\r\n    \/\/ Value\u306eList\u3092Person.no\u3067\u30bd\u30fc\u30c8<\/span>\r\n    \/\/ {1=[Person(categoryId=1, no=1), Person(categoryId=1, no=2)], 2=[Person(categoryId=2, no=1), Person(categoryId=2, no=2)]}<\/span>\r\n    Map<\/span><<\/span>Integer<\/span>,<\/span> List<\/span><<\/span>Person<\/span>>><\/span> sortedByValue<\/span> =<\/span> persons<\/span>.<\/span>stream<\/span>()<\/span>\r\n            .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>Person:<\/span>:<\/span>getCategoryId<\/span>,<\/span> toSortedList<\/span>(<\/span>Comparator<\/span>.<\/span>comparing<\/span>(<\/span>Person:<\/span>:<\/span>getNo<\/span>))));<\/span>\r\n\r\n    \/\/ Key\u3092Person.id\u3067\u30bd\u30fc\u30c8<\/span>\r\n    \/\/ {1=[Person(categoryId=1, no=2), Person(categoryId=1, no=1)], 2=[Person(categoryId=2, no=2), Person(categoryId=2, no=1)]}<\/span>\r\n    Map<\/span><<\/span>Integer<\/span>,<\/span> List<\/span><<\/span>Person<\/span>>><\/span> sortedByKey<\/span> =<\/span>  new<\/span> LinkedHashMap<\/span><<\/span>Integer<\/span>,<\/span> List<\/span><<\/span>Person<\/span>>>();<\/span>\r\n    personMap<\/span>.<\/span>entrySet<\/span>()<\/span>\r\n    .<\/span>stream<\/span>()<\/span>\r\n    .<\/span>sorted<\/span>(<\/span>Map<\/span>.<\/span>Entry<\/span>.<\/span>comparingByKey<\/span>())<\/span>\r\n    .<\/span>forEachOrdered<\/span>(<\/span>e<\/span> -><\/span> sortedByKey<\/span>.<\/span>put<\/span>(<\/span>e<\/span>.<\/span>getKey<\/span>(),<\/span> e<\/span>.<\/span>getValue<\/span>()));<\/span>\r\n}<\/span>\r\n\r\nprivate<\/span> <<\/span>T<\/span>><\/span> Collector<\/span><<\/span>T<\/span>,<\/span> ?,<\/span> List<\/span><<\/span>T<\/span>>><\/span> toSortedList<\/span>(<\/span>Comparator<\/span><?<\/span> super<\/span> T<\/span>><\/span> startDateComparator<\/span>)<\/span> {<\/span>\r\n    return<\/span> Collectors<\/span>.<\/span>collectingAndThen<\/span>(<\/span>\r\n            Collectors<\/span>.<\/span>toCollection<\/span>(<\/span>ArrayList:<\/span>:<\/span>new<\/span>),<\/span> list<\/span> -><\/span> {<\/span>\r\n                list<\/span>.<\/span>sort<\/span>(<\/span>startDateComparator<\/span>);<\/span>\r\n                return<\/span> list<\/span>;<\/span>\r\n            });<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u6a21\u5f0f\u5339\u914d<\/h2>\n
    @Test<\/span>\r\n    public<\/span> void<\/span> \u672b\u5c3e\u306e1\u6841\u4ee5\u4e0a\u306e\u6570\u5024\u3092\u53d6\u5f97<\/span>()<\/span> {<\/span>\r\n        Pattern<\/span> thisPattern<\/span> =<\/span> Pattern<\/span>.<\/span>compile<\/span>(<\/span>\"[1-9]{1,}$\"<\/span>);<\/span>\r\n        String<\/span> str<\/span> =<\/span> \"\u4e16\u754c\u306e13\u306e\u79d8\u5bc6 \u30b7\u30fc\u30ba\u30f312\"<\/span>;<\/span>\r\n        Matcher<\/span> m<\/span> =<\/span> thisPattern<\/span>.<\/span>matcher<\/span>(<\/span>str<\/span>);<\/span>\r\n        if<\/span> (<\/span>m<\/span>.<\/span>find<\/span>())<\/span> {<\/span>\r\n            int<\/span> start<\/span> =<\/span> m<\/span>.<\/span>start<\/span>();<\/span>\r\n            int<\/span> end<\/span> =<\/span> m<\/span>.<\/span>end<\/span>();<\/span>\r\n            int<\/span> resutl<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>str<\/span>.<\/span>substring<\/span>(<\/span>start<\/span>,<\/span> end<\/span>));<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>resutl<\/span>);<\/span> \/\/ 12<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    @Test<\/span>\r\n    public<\/span> void<\/span> \u672b\u5c3e\u306e1\u6841\u4ee5\u4e0a\u306e\u5168\u89d2\u6570\u5024\u3092\u53d6\u5f97<\/span>()<\/span> {<\/span>\r\n        Pattern<\/span> thisPattern<\/span> =<\/span> Pattern<\/span>.<\/span>compile<\/span>(<\/span>\"[\uff11-\uff19]{1,}$\"<\/span>);<\/span>\r\n        String<\/span> str<\/span> =<\/span> \"\u4e16\u754c\u306e13\u306e\u79d8\u5bc6 \u30b7\u30fc\u30ba\u30f3\uff12\uff12\"<\/span>;<\/span>\r\n        Matcher<\/span> m<\/span> =<\/span> thisPattern<\/span>.<\/span>matcher<\/span>(<\/span>str<\/span>);<\/span>\r\n        if<\/span> (<\/span>m<\/span>.<\/span>find<\/span>())<\/span> {<\/span>\r\n            int<\/span> start<\/span> =<\/span> m<\/span>.<\/span>start<\/span>();<\/span>\r\n            int<\/span> end<\/span> =<\/span> m<\/span>.<\/span>end<\/span>();<\/span>\r\n            int<\/span> resutl<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>str<\/span>.<\/span>substring<\/span>(<\/span>start<\/span>,<\/span> end<\/span>));<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>resutl<\/span>);<\/span> \/\/ 22<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    @Test<\/span>\r\n    public<\/span> void<\/span> \u672b\u5c3e\u306e1\u6841\u4ee5\u4e0a\u306e\u5168\u89d2\u534a\u89d2\u6570\u5024\u3092\u53d6\u5f97<\/span>()<\/span> {<\/span>\r\n        Pattern<\/span> thisPattern<\/span> =<\/span> Pattern<\/span>.<\/span>compile<\/span>(<\/span>\"[1-9\uff11-\uff19]{1,}$\"<\/span>);<\/span>\r\n        String<\/span> str<\/span> =<\/span> \"\u4e16\u754c\u306e13\u306e\u79d8\u5bc6 \u30b7\u30fc\u30ba\u30f3\uff12\uff12\"<\/span>;<\/span>\r\n        Matcher<\/span> m<\/span> =<\/span> thisPattern<\/span>.<\/span>matcher<\/span>(<\/span>str<\/span>);<\/span>\r\n        if<\/span> (<\/span>m<\/span>.<\/span>find<\/span>())<\/span> {<\/span>\r\n            int<\/span> start<\/span> =<\/span> m<\/span>.<\/span>start<\/span>();<\/span>\r\n            int<\/span> end<\/span> =<\/span> m<\/span>.<\/span>end<\/span>();<\/span>\r\n            int<\/span> resutl<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>str<\/span>.<\/span>substring<\/span>(<\/span>start<\/span>,<\/span> end<\/span>));<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>resutl<\/span>);<\/span>\r\n        }<\/span>\r\n        String<\/span> str2<\/span> =<\/span> \"\u4e16\u754c\u306e13\u306e\u79d8\u5bc6 \u30b7\u30fc\u30ba\u30f322\"<\/span>;<\/span>\r\n        Matcher<\/span> m2<\/span> =<\/span> thisPattern<\/span>.<\/span>matcher<\/span>(<\/span>str2<\/span>);<\/span>\r\n        if<\/span> (<\/span>m2<\/span>.<\/span>find<\/span>())<\/span> {<\/span>\r\n            int<\/span> start<\/span> =<\/span> m2<\/span>.<\/span>start<\/span>();<\/span>\r\n            int<\/span> end<\/span> =<\/span> m2<\/span>.<\/span>end<\/span>();<\/span>\r\n            int<\/span> resutl<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>str2<\/span>.<\/span>substring<\/span>(<\/span>start<\/span>,<\/span> end<\/span>));<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>resutl<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u5c06\u6240\u6709\u7684\u5339\u914d\u90e8\u5206\u79fb\u9664\u3002<\/h4>\n
    @Test<\/span>\r\n    public<\/span> void<\/span> \u30ab\u30ae\u30ab\u30c3\u30b3\u7b87\u6240\u3092\u524a\u9664<\/span>()<\/span> {<\/span>\r\n        String<\/span> str<\/span> =<\/span> \"text0{A}{B}text1{C}text2{D}text3{E}\"<\/span>;<\/span>\r\n        String<\/span> actual<\/span> =<\/span> recursiveCut<\/span>(<\/span>str<\/span>);<\/span>\r\n        assertEquals<\/span>(<\/span>\"text0text1text2text3\"<\/span>,<\/span> actual<\/span>);<\/span>\r\n    }<\/span>\r\n    private<\/span> String<\/span> recursiveCut<\/span>(<\/span>String<\/span> str<\/span>)<\/span> {<\/span>\r\n        \/\/ ?\u3092\u3044\u308c\u308b\u3068\u6700\u77ed\u30de\u30c3\u30c1<\/span>\r\n        Pattern<\/span> thisPattern<\/span> =<\/span> Pattern<\/span>.<\/span>compile<\/span>(<\/span>\"\\\\{.+?\\\\}\"<\/span>);<\/span>\r\n        Matcher<\/span> m<\/span> =<\/span> thisPattern<\/span>.<\/span>matcher<\/span>(<\/span>str<\/span>);<\/span>\r\n        String<\/span> result<\/span> =<\/span> null<\/span>;<\/span>\r\n        if<\/span> (<\/span>m<\/span>.<\/span>find<\/span>())<\/span> {<\/span>\r\n            int<\/span> start<\/span> =<\/span> m<\/span>.<\/span>start<\/span>();<\/span>\r\n            int<\/span> end<\/span> =<\/span> m<\/span>.<\/span>end<\/span>();<\/span>\r\n            result<\/span> =<\/span> str<\/span>.<\/span>substring<\/span>(<\/span>0<\/span>,<\/span> start<\/span>);<\/span>\r\n            result<\/span> +=<\/span> str<\/span>.<\/span>substring<\/span>(<\/span>end<\/span>,<\/span> str<\/span>.<\/span>length<\/span>());<\/span>\r\n            result<\/span> =<\/span> recursiveCut<\/span>(<\/span>result<\/span>);<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            return<\/span> str<\/span>;<\/span>\r\n        }<\/span>\r\n        return<\/span> result<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u6863\u6848<\/h2>\n
\u9a8c\u8bc1<\/h3>\n
\r\npublic<\/span> class<\/span> FileHelper<\/span> {<\/span>\r\n    private<\/span> static<\/span> Map<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> invalidFileChar<\/span> =<\/span> new<\/span> HashMap<\/span><>();<\/span>\r\n\r\n    @Test<\/span>\r\n    public<\/span> void<\/span> getValidFilenameTest<\/span>()<\/span> {<\/span>\r\n        List<\/span><<\/span>String<\/span>><\/span> invalidFileNames<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt|small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt\/small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt?small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt\\\\small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt:small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt\\\"small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt<small\"<\/span>);<\/span>\r\n        invalidFileNames<\/span>.<\/span>add<\/span>(<\/span>\"file.txt>small\"<\/span>);<\/span>\r\n\r\n        for<\/span> (<\/span>String<\/span> invalidFileName<\/span> :<\/span> invalidFileNames<\/span>)<\/span> {<\/span>\r\n            String<\/span> validFileName<\/span> =<\/span> FileHelper<\/span>.<\/span>getValidFilename<\/span>(<\/span>invalidFileName<\/span>);<\/span>\r\n            assertEquals<\/span>(<\/span>\"file.txt\"<\/span>,<\/span> validFileName<\/span>);<\/span>\r\n        }<\/span>\r\n\r\n    }<\/span>\r\n\r\n    public<\/span> FileHelper<\/span>()<\/span> {<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"|\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"\/\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"?\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"\\\\\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\":\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"*\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"\\\"\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\"<\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n        this<\/span>.<\/span>invalidFileChar<\/span>.<\/span>put<\/span>(<\/span>\">\"<\/span>,<\/span> \"\"<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    \/**\r\n     * Windows\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u3067\u8a31\u5bb9\u3057\u306a\u3044\u6587\u5b57\u3092\u9664\u3044\u305f\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u8fd4\u3059\r\n     * @param fileName\r\n     * @return\r\n     *\/<\/span>\r\n    public<\/span> static<\/span> String<\/span> getValidFilename<\/span>(<\/span>String<\/span> fileName<\/span>)<\/span> {<\/span>\r\n        String<\/span> validFileName<\/span> =<\/span> fileName<\/span>;<\/span>\r\n        for<\/span> (<\/span>Map<\/span>.<\/span>Entry<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> entry<\/span> :<\/span> invalidFileChar<\/span>.<\/span>entrySet<\/span>())<\/span> {<\/span>\r\n            String<\/span> invalidChar<\/span> =<\/span> entry<\/span>.<\/span>getKey<\/span>();<\/span>\r\n            if<\/span> (<\/span>fileName<\/span>.<\/span>contains<\/span>(<\/span>invalidChar<\/span>))<\/span> {<\/span>\r\n                switch<\/span> (<\/span>invalidChar<\/span>)<\/span> {<\/span>\r\n                \/\/ Regular-Expressions special character<\/span>\r\n                case<\/span> \"\\\\\"<\/span>:<\/span>\r\n                case<\/span> \"*\"<\/span>:<\/span>\r\n                case<\/span> \"+\"<\/span>:<\/span>\r\n                case<\/span> \".\"<\/span>:<\/span>\r\n                case<\/span> \"?\"<\/span>:<\/span>\r\n                case<\/span> \"{\"<\/span>:<\/span>\r\n                case<\/span> \"}\"<\/span>:<\/span>\r\n                case<\/span> \"(\"<\/span>:<\/span>\r\n                case<\/span> \")\"<\/span>:<\/span>\r\n                case<\/span> \"[\"<\/span>:<\/span>\r\n                case<\/span> \"]\"<\/span>:<\/span>\r\n                case<\/span> \"^\"<\/span>:<\/span>\r\n                case<\/span> \"$\"<\/span>:<\/span>\r\n                case<\/span> \"\u2013\"<\/span>:<\/span>\r\n                case<\/span> \"|\"<\/span>:<\/span>\r\n                    validFileName<\/span> =<\/span> fileName<\/span>.<\/span>split<\/span>(<\/span>Pattern<\/span>.<\/span>quote<\/span>(<\/span>invalidChar<\/span>))[<\/span>0<\/span>];<\/span>\r\n                    break<\/span>;<\/span>\r\n                default<\/span>:<\/span>\r\n                    validFileName<\/span> =<\/span> fileName<\/span>.<\/span>split<\/span>(<\/span>invalidChar<\/span>)[<\/span>0<\/span>];<\/span>\r\n                }<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        return<\/span> validFileName<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u521b\u5efa<\/h3>\n
    \/**\r\n     * \u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u6642\u306b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3082\u4f5c\u6210\u3059\u308b\r\n     *\r\n     * @param file\r\n     *\/<\/span>\r\n    private<\/span> static<\/span> void<\/span> createFile<\/span>(<\/span>File<\/span> file<\/span>)<\/span> {<\/span>\r\n        Path<\/span> path<\/span> =<\/span> file<\/span>.<\/span>toPath<\/span>();<\/span>\r\n        if<\/span> (<\/span>Files<\/span>.<\/span>exists<\/span>(<\/span>path<\/span>))<\/span> {<\/span>\r\n            return<\/span>;<\/span>\r\n        }<\/span>\r\n        try<\/span> {<\/span>\r\n            Files<\/span>.<\/span>createDirectories<\/span>(<\/span>path<\/span>.<\/span>getParent<\/span>());<\/span>\r\n            Files<\/span>.<\/span>createFile<\/span>(<\/span>path<\/span>);<\/span>\r\n\r\n        }<\/span> catch<\/span> (<\/span>IOException<\/span> e<\/span>)<\/span> {<\/span>\r\n            \/\/ TODO Auto-generated catch block<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n\r\n<\/code><\/pre>\n
\u5220\u9664<\/h3>\n
Java7 – Java 7<\/h4>\n
\r\n    \/**\r\n     * \u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u6307\u5b9a\u3055\u308c\u305f\u5834\u5408\u306f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u914d\u4e0b\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u524a\u9664\r\n     *\r\n     * @param file\r\n     *\/<\/span>\r\n    private<\/span> static<\/span> void<\/span> deleteFile<\/span>(<\/span>File<\/span> file<\/span>)<\/span> {<\/span>\r\n        Path<\/span> path<\/span> =<\/span> file<\/span>.<\/span>toPath<\/span>();<\/span>\r\n        if<\/span> (<\/span>Files<\/span>.<\/span>exists<\/span>(<\/span>path<\/span>))<\/span> {<\/span>\r\n            if<\/span> (<\/span>file<\/span>.<\/span>isFile<\/span>())<\/span> {<\/span>\r\n                for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 100<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n                    if<\/span> (<\/span>file<\/span>.<\/span>delete<\/span>())<\/span> {<\/span>\r\n                        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30d5\u30a1\u30a4\u30eb\u524a\u9664\u6210\u529f\"<\/span>);<\/span>\r\n                        break<\/span>;<\/span>\r\n                    }<\/span> else<\/span> {<\/span>\r\n                        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30d5\u30a1\u30a4\u30eb\u524a\u9664\u5931\u6557\"<\/span>);<\/span>\r\n                        try<\/span> {<\/span>\r\n                            Thread<\/span>.<\/span>sleep<\/span>(<\/span>1000<\/span>);<\/span>\r\n                        }<\/span> catch<\/span> (<\/span>InterruptedException<\/span> e<\/span>)<\/span> {<\/span>\r\n                            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n                        }<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n            }<\/span> else<\/span> if<\/span> (<\/span>Files<\/span>.<\/span>isDirectory<\/span>(<\/span>path<\/span>))<\/span> {<\/span>\r\n                try<\/span> (<\/span>Stream<\/span><<\/span>Path<\/span>><\/span> walk<\/span> =<\/span> Files<\/span>.<\/span>walk<\/span>(<\/span>path<\/span>,<\/span> FileVisitOption<\/span>.<\/span>FOLLOW_LINKS<\/span>))<\/span> {<\/span>\r\n                    walk<\/span>.<\/span>sorted<\/span>(<\/span>Comparator<\/span>.<\/span>reverseOrder<\/span>()).<\/span>map<\/span>(<\/span>Path:<\/span>:<\/span>toFile<\/span>).<\/span>forEach<\/span>(<\/span>File:<\/span>:<\/span>delete<\/span>);<\/span>\r\n                    path<\/span>.<\/span>toFile<\/span>().<\/span>delete<\/span>();<\/span>\r\n                }<\/span> catch<\/span> (<\/span>IOException<\/span> ie<\/span>)<\/span> {<\/span>\r\n                    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ie<\/span>);<\/span>\r\n                }<\/span>\r\n            }<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\"<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
Java6 (\u53ea\u9700\u8981\u4e00\u79cd\u65b9\u6cd5\u6765\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u4e2d\u6587\u672c\u5730\u5316)<\/h4>\n
    \/**\r\n     * \u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u6307\u5b9a\u3055\u308c\u305f\u5834\u5408\u306f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u914d\u4e0b\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u3059\u3079\u3066\u524a\u9664\u3059\u308b\r\n     * @param file\r\n     *\/<\/span>\r\n    private<\/span> void<\/span> deleteFile<\/span>(<\/span>File<\/span> file<\/span>)<\/span> {<\/span>\r\n        if<\/span>(<\/span>file<\/span>.<\/span>exists<\/span>())<\/span> {<\/span>\r\n            if<\/span>(<\/span>file<\/span>.<\/span>isFile<\/span>())<\/span> {<\/span>\r\n                for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 100<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n                    if<\/span> (<\/span>file<\/span>.<\/span>delete<\/span>())<\/span> {<\/span>\r\n                        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30d5\u30a1\u30a4\u30eb\u524a\u9664\u6210\u529f\"<\/span>);<\/span>\r\n                        break<\/span>;<\/span>\r\n                    }<\/span> else<\/span> {<\/span>\r\n                        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30d5\u30a1\u30a4\u30eb\u524a\u9664\u5931\u6557\"<\/span>);<\/span>\r\n                        try<\/span> {<\/span>\r\n                            Thread<\/span>.<\/span>sleep<\/span>(<\/span>1000<\/span>);<\/span>\r\n                        }<\/span> catch<\/span> (<\/span>InterruptedException<\/span> e<\/span>)<\/span> {<\/span>\r\n                            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n                        }<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n            }<\/span> else<\/span> if<\/span>(<\/span>file<\/span>.<\/span>isDirectory<\/span>())<\/span> {<\/span>\r\n                File<\/span>[]<\/span> files<\/span> =<\/span> file<\/span>.<\/span>listFiles<\/span>();<\/span>\r\n\r\n                if<\/span>(<\/span>files<\/span> ==<\/span> null<\/span>)<\/span> {<\/span>\r\n                    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u914d\u4e0b\u306b\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u306a\u3044\"<\/span>);<\/span>\r\n                }<\/span>\r\n                \/\/ \u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u5185\u306e\u5168\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u524a\u9664\u5bfe\u8c61\u3068\u3059\u308b<\/span>\r\n                for<\/span>(<\/span>int<\/span> i<\/span>=<\/span>0<\/span>;<\/span> i<\/span><<\/span>files<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n                    if<\/span>(<\/span>files<\/span>[<\/span>i<\/span>].<\/span>exists<\/span>()<\/span> ==<\/span> false<\/span>)<\/span> {<\/span>\r\n                        continue<\/span>;<\/span>\r\n                    \/\/\u30d5\u30a1\u30a4\u30eb\u306e\u5834\u5408\u306f\u518d\u5e30\u7684\u306b\u81ea\u8eab\u3092\u547c\u3073\u51fa\u3057\u3066\u524a\u9664\u3059\u308b<\/span>\r\n                    }<\/span> else<\/span> if<\/span>(<\/span>files<\/span>[<\/span>i<\/span>].<\/span>isFile<\/span>())<\/span> {<\/span>\r\n                        deleteFile<\/span>(<\/span>files<\/span>[<\/span>i<\/span>]);<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n            }<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\u30f3\"<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n<\/code><\/pre>\n
\u8bf7\u5199\u4e0b\u6765<\/h3>\n
    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>\r\n        String<\/span> path<\/span> =<\/span> Paths<\/span>.<\/span>get<\/span>(<\/span>System<\/span>.<\/span>getProperty<\/span>(<\/span>\"user.dir\"<\/span>),<\/span> \"sample\"<\/span>,<\/span> \"test.txt\"<\/span>).<\/span>toString<\/span>();<\/span>\r\n        File<\/span> file<\/span> =<\/span> new<\/span> File<\/span>(<\/span>path<\/span>);<\/span>\r\n        if<\/span> (!<\/span>file<\/span>.<\/span>exists<\/span>())<\/span> {<\/span>\r\n            file<\/span>.<\/span>createNewFile<\/span>();<\/span>\r\n        }<\/span>\r\n        FileWriter<\/span> writer<\/span> =<\/span> new<\/span> FileWriter<\/span>(<\/span>path<\/span>);<\/span>\r\n        PrintWriter<\/span> pw<\/span> =<\/span> new<\/span> PrintWriter<\/span>(<\/span>new<\/span> BufferedWriter<\/span>(<\/span>writer<\/span>));<\/span>\r\n        pw<\/span>.<\/span>println<\/span>(<\/span>\"apple\"<\/span>);<\/span>\r\n        pw<\/span>.<\/span>println<\/span>(<\/span>\"orange\"<\/span>);<\/span>\r\n        pw<\/span>.<\/span>println<\/span>(<\/span>\"melon\"<\/span>);<\/span>\r\n\r\n        pw<\/span>.<\/span>close<\/span>();<\/span>\r\n\r\n\/\/        file.delete();<\/span>\r\n\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u9605\u8bfb<\/h3>\n
\r\n        Path<\/span> path<\/span> =<\/span> Paths<\/span>.<\/span>get<\/span>(<\/span>System<\/span>.<\/span>getProperty<\/span>(<\/span>\"user.dir\"<\/span>),<\/span> \"data.csv\"<\/span>);<\/span>\r\n        List<\/span><<\/span>String<\/span>[]><\/span> lines<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n        \/\/ \u672b\u5c3e\u304b\u3089\u8aad\u307f\u8fbc\u3080\u5834\u5408<\/span>\r\n\/\/      try (ReversedLinesFileReader reader = new ReversedLinesFileReader(path.toFile())) {<\/span>\r\n        try<\/span> (<\/span>BufferedReader<\/span> reader<\/span> =<\/span> Files<\/span>.<\/span>newBufferedReader<\/span>(<\/span>path<\/span>))<\/span> {<\/span>\r\n            String<\/span> str<\/span>;<\/span>\r\n            while<\/span> ((<\/span>str<\/span> =<\/span> reader<\/span>.<\/span>readLine<\/span>())<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\r\n                lines<\/span>.<\/span>add<\/span>(<\/span>str<\/span>.<\/span>split<\/span>(<\/span>\",\"<\/span>));<\/span>\r\n            }<\/span>\r\n        }<\/span> catch<\/span> (<\/span>IOException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n\r\n        for<\/span> (<\/span>String<\/span>[]<\/span> cols<\/span> :<\/span> lines<\/span>)<\/span> {<\/span>\r\n            for<\/span> (<\/span>String<\/span> col<\/span> :<\/span> cols<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>col<\/span> +<\/span> \" \"<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
\u65f6\u95f4<\/h2>\n
\r\n    private<\/span> LocalDateTime<\/span> now<\/span>;<\/span>\r\n    private<\/span> Timestamp<\/span> now_timestamp<\/span>;<\/span>\r\n    private<\/span> LocalDateTime<\/span> before10min<\/span>;<\/span>\r\n    private<\/span> Timestamp<\/span> before10min_timestamp<\/span>;<\/span>\r\n    private<\/span> LocalDateTime<\/span> after10min<\/span>;<\/span>\r\n    private<\/span> Timestamp<\/span> after10min_timestamp<\/span>;<\/span>\r\n\r\n    @Before<\/span>\r\n    public<\/span> void<\/span> setUp<\/span>()<\/span> {<\/span>\r\n        now<\/span> =<\/span> LocalDateTime<\/span>.<\/span>now<\/span>();<\/span>\r\n        now_timestamp<\/span> =<\/span> Timestamp<\/span>.<\/span>valueOf<\/span>(<\/span>now<\/span>);<\/span>\r\n        before10min<\/span> =<\/span> now<\/span>.<\/span>minusMinutes<\/span>(<\/span>10<\/span>);<\/span>\r\n        before10min_timestamp<\/span> =<\/span> Timestamp<\/span>.<\/span>valueOf<\/span>(<\/span>before10min<\/span>);<\/span>\r\n        after10min<\/span> =<\/span> now<\/span>.<\/span>plusMinutes<\/span>(<\/span>10<\/span>);<\/span>\r\n        after10min_timestamp<\/span> =<\/span> Timestamp<\/span>.<\/span>valueOf<\/span>(<\/span>after10min<\/span>);<\/span>\r\n    }<\/span>\r\n    @Test<\/span>\r\n    public<\/span> void<\/span> afterMathodTest<\/span>()<\/span> {<\/span>\r\n        assertTrue<\/span>(<\/span>now<\/span>.<\/span>isAfter<\/span>(<\/span>before10min<\/span>));<\/span>\r\n        assertTrue<\/span>(<\/span>now_timestamp<\/span>.<\/span>after<\/span>(<\/span>before10min_timestamp<\/span>));<\/span>\r\n    }<\/span>\r\n\r\n    @Test<\/span>\r\n    public<\/span> void<\/span> beforeMathodTest<\/span>()<\/span> {<\/span>\r\n        assertTrue<\/span>(<\/span>before10min<\/span>.<\/span>isBefore<\/span>(<\/span>now<\/span>));<\/span>\r\n        assertTrue<\/span>(<\/span>before10min_timestamp<\/span>.<\/span>before<\/span>(<\/span>now_timestamp<\/span>));<\/span>\r\n    }<\/span>\r\n\r\n    @Test<\/span>\r\n    public<\/span> void<\/span> beforeAndAfterMathodTest<\/span>()<\/span> {<\/span>\r\n        assertTrue<\/span>(<\/span>before10min<\/span>.<\/span>isBefore<\/span>(<\/span>now<\/span>)<\/span> &&<\/span> after10min<\/span>.<\/span>isAfter<\/span>(<\/span>now<\/span>));<\/span>\r\n        assertTrue<\/span>(<\/span>before10min_timestamp<\/span>.<\/span>before<\/span>(<\/span>now_timestamp<\/span>)<\/span> &&<\/span> after10min_timestamp<\/span>.<\/span>after<\/span>(<\/span>now_timestamp<\/span>));<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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