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Spring Boot中的Controller是线程安全的吗?

bigegpt 2024-08-31 16:54 4 浏览

背景

在Spring Boot中，Controller通常是线程不安全的。Controller是Spring MVC中的一个组件，用于处理HTTP请求和返回响应。由于HTTP请求通常是并发的，Controller可能会被多个线程同时访问。

Controller类通常包含实例变量（成员变量），如果这些变量被多个线程访问并修改，就可能发生线程安全问题。例如，如果一个Controller实例变量被多个请求同时修改，可能会导致数据不一致。

然而，Controller中的大部分操作，如处理请求、返回响应等，都是线程安全的，因为Spring框架为每个请求创建了独立的线程。但是，如果你在Controller中使用非线程安全的共享资源，或者在Controller中缓存数据，就需要特别注意线程安全问题。

以下是一些确保Controller线程安全的策略：

  1. 使用无状态设计：尽量让Controller保持无状态，不要在Controller中使用实例变量存储请求数据。
  2. 使用线程安全的类：如果必须使用共享资源，确保使用的是线程安全的类，如ConcurrentHashMap。
  3. 使用局部变量：尽量使用方法内的局部变量来存储请求数据，因为局部变量对于每个线程都是独立的。
  4. 使用同步机制：如果必须修改共享资源，可以使用synchronized关键字或ReentrantLock等同步机制来确保线程安全。
  5. 使用@Scope("prototype")注解：Spring默认为Controller创建单例（singleton）作用域的Bean，这意味着所有请求共享同一个Controller实例。如果你的Controller需要线程安全，可以将其作用域更改为原型（prototype），这样每个请求都会创建一个新的Controller实例。

请注意，虽然使用原型作用域可以避免线程安全问题，但这可能会影响应用程序的性能，因为每次请求都需要创建一个新的Controller实例。

Controller中使用线程不安全的HashMap和ConcurrentHashMap实例

多线程情况下

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class MapConcurrencyTest {

    public static void main(String[] args) {
        // 测试HashMap的线程安全性
        Map<Integer, Integer> hashMap = new HashMap<>();
        testMapConcurrency(hashMap);

        // 测试ConcurrentHashMap的线程安全性
        Map<Integer, Integer> concurrentHashMap = new ConcurrentHashMap<>();
        testMapConcurrency(concurrentHashMap);
    }

    private static void testMapConcurrency(Map<Integer, Integer> map) {
        int numberOfThreads = 100;
        Thread[] threads = new Thread[numberOfThreads];

        for (int i = 0; i < numberOfThreads; i++) {
            int finalI = i;
            threads[i] = new Thread(() -> {
                try {
                    // 模拟高并发的读写操作
                    for (int j = 0; j < numberOfThreads; j++) {
                        map.put(finalI, finalI);
                        int value = map.get(finalI);
                        // 这里可以添加断言来检查value是否等于finalI
                    }
                } catch (Exception e) {
                	
                    e.printStackTrace();
                }
            });
        }

        // 启动所有线程
        for (Thread thread : threads) {
            thread.start();
        }

        // 等待所有线程完成
        for (Thread thread : threads) {
            try {
                thread.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        // 打印最终的Map状态
        System.out.println(map.getClass().getSimpleName() + " final state: " + map);
    }
}

100个线程下的运行结果正常

HashMap final state: {0=0, 1=1, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=9, 10=10, 11=11, 12=12, 13=13, 14=14, 15=15, 16=16, 17=17, 18=18, 19=19, 20=20, 21=21, 22=22, 23=23, 24=24, 25=25, 26=26, 27=27, 28=28, 29=29, 30=30, 31=31, 32=32, 33=33, 34=34, 35=35, 36=36, 37=37, 38=38, 39=39, 40=40, 41=41, 42=42, 43=43, 44=44, 45=45, 46=46, 47=47, 48=48, 49=49, 50=50, 51=51, 52=52, 53=53, 54=54, 55=55, 56=56, 57=57, 58=58, 59=59, 60=60, 61=61, 62=62, 63=63, 64=64, 65=65, 66=66, 67=67, 68=68, 69=69, 70=70, 71=71, 72=72, 73=73, 74=74, 75=75, 76=76, 77=77, 78=78, 79=79, 80=80, 81=81, 82=82, 83=83, 84=84, 85=85, 86=86, 87=87, 88=88, 89=89, 90=90, 91=91, 92=92, 93=93, 94=94, 95=95, 96=96, 97=97, 98=98, 99=99}
ConcurrentHashMap final state: {0=0, 1=1, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=9, 10=10, 11=11, 12=12, 13=13, 14=14, 15=15, 16=16, 17=17, 18=18, 19=19, 20=20, 21=21, 22=22, 23=23, 24=24, 25=25, 26=26, 27=27, 28=28, 29=29, 30=30, 31=31, 32=32, 33=33, 34=34, 35=35, 36=36, 37=37, 38=38, 39=39, 40=40, 41=41, 42=42, 43=43, 44=44, 45=45, 46=46, 47=47, 48=48, 49=49, 50=50, 51=51, 52=52, 53=53, 54=54, 55=55, 56=56, 57=57, 58=58, 59=59, 60=60, 61=61, 62=62, 63=63, 64=64, 65=65, 66=66, 67=67, 68=68, 69=69, 70=70, 71=71, 72=72, 73=73, 74=74, 75=75, 76=76, 77=77, 78=78, 79=79, 80=80, 81=81, 82=82, 83=83, 84=84, 85=85, 86=86, 87=87, 88=88, 89=89, 90=90, 91=91, 92=92, 93=93, 94=94, 95=95, 96=96, 97=97, 98=98, 99=99}

2000个线程下运行出现异常,且结果不匹配。注意，本机下测试，不同情况会有不同的结果。

java.lang.NullPointerException
	at org.xxx.MapConcurrencyTest.lambda$0(MapConcurrencyTest.java:30)
	at java.lang.Thread.run(Thread.java:745)
HashMap final state: {1=1, 2=2, 3=3, 6=6, 8=8, 9=9, 10=10, 11=11, 12=12, 13=13, 14=14, 15=15, 16=16, 17=17, 18=18, 19=19, 20=20, 21=21, 22=22, 23=23, 24=24, 25=25, 26=26, 27=27, 28=28, 29=29, 30=30, 31=31, 32=32, 33=33, 34=34, 35=35, 36=36, 37=37, 38=38, 39=39, 40=40, 41=41, 42=42, 43=43, 44=44, 45=45, 46=46, 47=47, 48=48, 49=49, 50=50, 51=51, 52=52, 53=53, 54=54, 55=55, 56=56, 57=57, 58=58, 59=59, 60=60, 61=61, 62=62, 63=63, 64=64, 65=65, 66=66, 67=67, 68=68, 69=69, 70=70, 71=71, 72=72, 73=73, 74=74, 75=75, 76=76, 77=77, 78=78, 79=79, 80=80, 81=81, 82=82, 83=83, 84=84, 85=85, 86=86, 87=87, 88=88, 89=89, 90=90, 91=91, 92=92, 93=93, 94=94, 95=95, 96=96, 97=97, 98=98, 99=99, 100=100, 101=101, 102=102, 103=103, 104=104, 105=105, 106=106, 107=107, 108=108, 109=109, 110=110, 111=111, 112=112, 113=113, 114=114, 115=115, 116=116, 117=117, 118=118, 119=119, 120=120, 121=121, 122=122, 123=123, 124=124, 125=125, 126=126, 127=127, 128=128, 129=129, 130=130, 131=131, 132=132, 133=133, 135=135, 137=137, 138=138, 139=139, 140=140, 141=141, 142=142, 143=143, 144=144, 145=145, 146=146, 147=147, 148=148, 149=149, 150=150, 151=151, 152=152, 153=153, 154=154, 155=155, 156=156, 157=157, 158=158, 159=159, 160=160, 161=161, 162=162, 163=163, 164=164, 165=165, 166=166, 167=167, 168=168, 169=169, 170=170, 171=171, 172=172, 173=173, 174=174, 175=175, 176=176, 177=177, 178=178, 179=179, 180=180, 181=181, 182=182, 183=183, 184=184, 185=185, 186=186, 187=187, 188=188, 189=189, 190=190, 191=191, 192=192, 193=193, 194=194, 195=195, 196=196, 197=197, 198=198, 199=199, 200=200, 201=201, 202=202, 203=203, 204=204, 205=205, 206=206, 207=207, 208=208, 209=209, 210=210, 211=211, 212=212, 213=213, 214=214, 215=215, 216=216, 217=217, 218=218, 219=219, 220=220, 221=221, 222=222, 223=223, 224=224, 225=225, 226=226, 227=227, 228=228, 229=229, 230=230, 231=231, 232=232, 233=233, 234=234, 235=235, 236=236, 237=237, 238=238, 239=239, 240=240, 241=241, 242=242, 243=243, 244=244, 245=245, 246=246, 247=247, 248=248, 249=249, 250=250, 251=251, 252=252, 253=253, 254=254, 255=255, 256=256, 257=257, 258=258, 259=259, 260=260, 261=261, 262=262, 263=263, 264=264, 265=265, 266=266, 267=267, 268=268, 269=269, 270=270, 271=271, 272=272, 273=273, 274=274, 275=275, 276=276, 277=277, 278=278, 279=279, 280=280, 281=281, 282=282, 283=283, 284=284, 285=285, 286=286, 287=287, 288=288, 289=289, 290=290, 291=291, 292=292, 293=293, 294=294, 295=295, 296=296, 297=297, 298=298, 299=299, 300=300, 301=301, 302=302, 303=303, 304=304, 305=305, 306=306, 307=307, 308=308, 309=309, 310=310, 311=311, 312=312, 313=313, 314=314, 315=315, 316=316, 317=317, 318=318, 319=319, 320=320, 321=321, 322=322, 323=323, 324=324, 325=325, 326=326, 327=327, 328=328, 329=329, 330=330, 331=331, 332=332, 333=333, 334=334, 335=335, 336=336, 337=337, 338=338, 339=339, 340=340, 341=341, 342=342, 343=343, 344=344, 345=345, 346=346, 347=347, 348=348, 349=349, 350=350, 351=351, 352=352, 353=353, 354=354, 355=355, 356=356, 357=357, 358=358, 359=359, 360=360, 361=361, 362=362, 363=363, 364=364, 365=365, 366=366, 367=367, 368=368, 369=369, 370=370, 371=371, 372=372, 373=373, 374=374, 375=375, 376=376, 377=377, 378=378, 379=379, 380=380, 381=381, 382=382, 383=383, 384=384, 385=385, 386=386, 387=387, 388=388, 389=389, 390=390, 391=391, 392=392, 393=393, 394=394, 395=395, 396=396, 397=397, 398=398, 399=399, 400=400, 401=401, 402=402, 403=403, 404=404, 405=405, 406=406, 407=407, 408=408, 409=409, 410=410, 411=411, 412=412, 413=413, 414=414, 415=415, 416=416, 417=417, 418=418, 419=419, 420=420, 421=421, 422=422, 423=423, 424=424, 425=425, 426=426, 427=427, 428=428, 429=429, 430=430, 431=431, 432=432, 433=433, 434=434, 435=435, 436=436, 437=437, 438=438, 439=439, 440=440, 441=441, 442=442, 443=443, 446=446, 449=449, 451=451, 453=453, 454=454, 455=455, 456=456, 457=457, 458=458, 459=459, 460=460, 461=461, 462=462, 463=463, 464=464, 465=465, 466=466, 467=467, 468=468, 469=469, 470=470, 471=471, 472=472, 474=474, 476=476, 477=477, 478=478, 479=479, 480=480, 481=481, 482=482, 483=483, 484=484, 485=485, 486=486, 487=487, 488=488, 489=489, 490=490, 491=491, 492=492, 493=493, 494=494, 495=495, 496=496, 497=497, 499=499, 500=500, 501=501, 502=502, 503=503, 504=504, 506=506, 507=507, 508=508, 509=509, 510=510, 511=511, 512=512, 513=513, 514=514, 515=515, 516=516, 517=517, 518=518, 519=519, 520=520, 521=521, 522=522, 523=523, 524=524, 525=525, 526=526, 527=527, 528=528, 529=529, 530=530, 531=531, 532=532, 533=533, 534=534, 535=535, 536=536, 537=537, 538=538, 539=539, 540=540, 541=541, 542=542, 543=543, 544=544, 545=545, 546=546, 547=547, 548=548, 549=549, 550=550, 551=551, 552=552, 553=553, 554=554, 555=555, 556=556, 557=557, 558=558, 559=559, 560=560, 561=561, 562=562, 563=563, 564=564, 565=565, 566=566, 567=567, 568=568, 569=569, 570=570, 571=571, 572=572, 573=573, 574=574, 575=575, 576=576, 577=577, 578=578, 579=579, 580=580, 581=581, 582=582, 583=583, 584=584, 585=585, 586=586, 587=587, 588=588, 589=589, 590=590, 591=591, 592=592, 593=593, 594=594, 595=595, 596=596, 597=597, 598=598, 599=599, 600=600, 601=601, 602=602, 603=603, 604=604, 605=605, 606=606, 607=607, 608=608, 609=609, 610=610, 611=611, 612=612, 613=613, 614=614, 615=615, 616=616, 617=617, 618=618, 619=619, 620=620, 621=621, 622=622, 623=623, 624=624, 625=625, 626=626, 627=627, 628=628, 629=629, 630=630, 631=631, 632=632, 633=633, 634=634, 635=635, 636=636, 637=637, 638=638, 639=639, 640=640, 641=641, 642=642, 643=643, 644=644, 645=645, 646=646, 647=647, 648=648, 649=649, 650=650, 651=651, 652=652, 653=653, 654=654, 655=655, 656=656, 657=657, 658=658, 659=659, 660=660, 661=661, 662=662, 663=663, 664=664, 665=665, 666=666, 667=667, 668=668, 669=669, 670=670, 671=671, 672=672, 673=673, 674=674, 675=675, 676=676, 677=677, 678=678, 679=679, 680=680, 681=681, 682=682, 683=683, 684=684, 685=685, 686=686, 687=687, 688=688, 689=689, 690=690, 691=691, 692=692, 693=693, 694=694, 695=695, 696=696, 697=697, 698=698, 699=699, 700=700, 701=701, 702=702, 703=703, 704=704, 705=705, 706=706, 707=707, 708=708, 709=709, 710=710, 711=711, 712=712, 713=713, 714=714, 715=715, 716=716, 717=717, 718=718, 719=719, 720=720, 721=721, 722=722, 723=723, 724=724, 725=725, 726=726, 727=727, 728=728, 729=729, 730=730, 731=731, 732=732, 733=733, 734=734, 735=735, 736=736, 737=737, 738=738, 739=739, 740=740, 741=741, 742=742, 743=743, 744=744, 745=745, 746=746, 747=747, 748=748, 749=749, 750=750, 751=751, 752=752, 753=753, 754=754, 755=755, 756=756, 757=757, 758=758, 759=759, 760=760, 761=761, 762=762, 763=763, 764=764, 765=765, 766=766, 767=767, 768=768, 769=769, 770=770, 771=771, 772=772, 773=773, 774=774, 775=775, 776=776, 777=777, 778=778, 779=779, 780=780, 781=781, 782=782, 783=783, 784=784, 785=785, 786=786, 787=787, 788=788, 789=789, 790=790, 791=791, 792=792, 793=793, 794=794, 795=795, 796=796, 797=797, 798=798, 799=799, 800=800, 801=801, 802=802, 803=803, 804=804, 805=805, 806=806, 807=807, 808=808, 809=809, 810=810, 811=811, 812=812, 813=813, 814=814, 815=815, 816=816, 817=817, 818=818, 819=819, 820=820, 821=821, 822=822, 823=823, 824=824, 825=825, 826=826, 827=827, 828=828, 829=829, 830=830, 831=831, 832=832, 833=833, 834=834, 835=835, 836=836, 837=837, 838=838, 839=839, 840=840, 841=841, 842=842, 843=843, 844=844, 845=845, 846=846, 847=847, 848=848, 849=849, 850=850, 851=851, 852=852, 853=853, 854=854, 855=855, 856=856, 857=857, 858=858, 859=859, 860=860, 861=861, 862=862, 863=863, 864=864, 865=865, 866=866, 867=867, 868=868, 869=869, 870=870, 871=871, 872=872, 873=873, 874=874, 875=875, 876=876, 877=877, 878=878, 879=879, 880=880, 881=881, 882=882, 883=883, 884=884, 885=885, 886=886, 887=887, 888=888, 889=889, 890=890, 891=891, 892=892, 893=893, 894=894, 895=895, 896=896, 897=897, 898=898, 899=899, 900=900, 901=901, 902=902, 903=903, 904=904, 905=905, 906=906, 907=907, 908=908, 909=909, 910=910, 911=911, 912=912, 913=913, 914=914, 915=915, 916=916, 917=917, 918=918, 919=919, 920=920, 921=921, 922=922, 923=923, 924=924, 925=925, 926=926, 927=927, 928=928, 929=929, 930=930, 931=931, 932=932, 933=933, 934=934, 935=935, 936=936, 937=937, 938=938, 939=939, 940=940, 941=941, 942=942, 943=943, 944=944, 945=945, 946=946, 947=947, 948=948, 949=949, 950=950, 951=951, 952=952, 953=953, 954=954, 955=955, 956=956, 957=957, 958=958, 959=959, 960=960, 961=961, 962=962, 963=963, 964=964, 965=965, 966=966, 967=967, 968=968, 969=969, 970=970, 971=971, 972=972, 973=973, 974=974, 975=975, 976=976, 977=977, 978=978, 979=979, 980=980, 981=981, 982=982, 983=983, 984=984, 985=985, 986=986, 987=987, 988=988, 989=989, 990=990, 991=991, 992=992, 993=993, 994=994, 995=995, 996=996, 997=997, 998=998, 999=999, 1000=1000, 1001=1001, 1002=1002, 1003=1003, 1004=1004, 1005=1005, 1006=1006, 1007=1007, 1008=1008, 1009=1009, 1010=1010, 1011=1011, 1012=1012, 1013=1013, 1014=1014, 1015=1015, 1016=1016, 1017=1017, 1018=1018, 1019=1019, 1020=1020, 1021=1021, 1022=1022, 1023=1023, 1024=1024, 1025=1025, 1026=1026, 1027=1027, 1028=1028, 1029=1029, 1030=1030, 1031=1031, 1032=1032, 1033=1033, 1034=1034, 1035=1035, 1036=1036, 1037=1037, 1038=1038, 1039=1039, 1040=1040, 1041=1041, 1042=1042, 1043=1043, 1044=1044, 1045=1045, 1046=1046, 1047=1047, 1048=1048, 1049=1049, 1050=1050, 1051=1051, 1052=1052, 1053=1053, 1054=1054, 1055=1055, 1056=1056, 1057=1057, 1058=1058, 1059=1059, 1060=1060, 1061=1061, 1062=1062, 1063=1063, 1064=1064, 1065=1065, 1066=1066, 1067=1067, 1068=1068, 1069=1069, 1070=1070, 1071=1071, 1072=1072, 1073=1073, 1074=1074, 1075=1075, 1076=1076, 1077=1077, 1078=1078, 1079=1079, 1080=1080, 1081=1081, 1082=1082, 1083=1083, 1084=1084, 1085=1085, 1086=1086, 1087=1087, 1088=1088, 1089=1089, 1090=1090, 1091=1091, 1092=1092, 1093=1093, 1094=1094, 1095=1095, 1096=1096, 1097=1097, 1098=1098, 1099=1099, 1100=1100, 1101=1101, 1102=1102, 1103=1103, 1104=1104, 1105=1105, 1106=1106, 1107=1107, 1108=1108, 1109=1109, 1110=1110, 1111=1111, 1112=1112, 1113=1113, 1114=1114, 1115=1115, 1116=1116, 1117=1117, 1118=1118, 1119=1119, 1120=1120, 1121=1121, 1122=1122, 1123=1123, 1124=1124, 1125=1125, 1126=1126, 1127=1127, 1128=1128, 1129=1129, 1130=1130, 1131=1131, 1132=1132, 1133=1133, 1134=1134, 1135=1135, 1136=1136, 1137=1137, 1138=1138, 1139=1139, 1140=1140, 1141=1141, 1142=1142, 1143=1143, 1144=1144, 1145=1145, 1146=1146, 1147=1147, 1148=1148, 1149=1149, 1150=1150, 1151=1151, 1152=1152, 1153=1153, 1154=1154, 1155=1155, 1156=1156, 1157=1157, 1158=1158, 1159=1159, 1160=1160, 1161=1161, 1162=1162, 1163=1163, 1164=1164, 1165=1165, 1166=1166, 1167=1167, 1168=1168, 1169=1169, 1170=1170, 1171=1171, 1172=1172, 1173=1173, 1174=1174, 1175=1175, 1176=1176, 1177=1177, 1178=1178, 1179=1179, 1180=1180, 1181=1181, 1182=1182, 1183=1183, 1184=1184, 1185=1185, 1186=1186, 1187=1187, 1188=1188, 1189=1189, 1190=1190, 1191=1191, 1192=1192, 1193=1193, 1194=1194, 1195=1195, 1196=1196, 1197=1197, 1198=1198, 1199=1199, 1200=1200, 1201=1201, 1202=1202, 1203=1203, 1204=1204, 1205=1205, 1206=1206, 1207=1207, 1208=1208, 1209=1209, 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1938=1938, 1939=1939, 1940=1940, 1941=1941, 1942=1942, 1943=1943, 1944=1944, 1945=1945, 1946=1946, 1947=1947, 1948=1948, 1949=1949, 1950=1950, 1951=1951, 1952=1952, 1953=1953, 1954=1954, 1955=1955, 1956=1956, 1957=1957, 1958=1958, 1959=1959, 1960=1960, 1961=1961, 1962=1962, 1963=1963, 1964=1964, 1965=1965, 1966=1966, 1967=1967, 1968=1968, 1969=1969, 1970=1970, 1971=1971, 1972=1972, 1973=1973, 1974=1974, 1975=1975, 1976=1976, 1977=1977, 1978=1978, 1979=1979, 1980=1980, 1981=1981, 1982=1982, 1983=1983, 1984=1984, 1985=1985, 1986=1986, 1987=1987, 1988=1988, 1989=1989, 1990=1990, 1991=1991, 1992=1992, 1993=1993, 1994=1994, 1995=1995, 1996=1996, 1997=1997, 1998=1998, 1999=1999}
ConcurrentHashMap final state: {0=0, 1=1, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=9, 10=10, 11=11, 12=12, 13=13, 14=14, 15=15, 16=16, 17=17, 18=18, 19=19, 20=20, 21=21, 22=22, 23=23, 24=24, 25=25, 26=26, 27=27, 28=28, 29=29, 30=30, 31=31, 32=32, 33=33, 34=34, 35=35, 36=36, 37=37, 38=38, 39=39, 40=40, 41=41, 42=42, 43=43, 44=44, 45=45, 46=46, 47=47, 48=48, 49=49, 50=50, 51=51, 52=52, 53=53, 54=54, 55=55, 56=56, 57=57, 58=58, 59=59, 60=60, 61=61, 62=62, 63=63, 64=64, 65=65, 66=66, 67=67, 68=68, 69=69, 70=70, 71=71, 72=72, 73=73, 74=74, 75=75, 76=76, 77=77, 78=78, 79=79, 80=80, 81=81, 82=82, 83=83, 84=84, 85=85, 86=86, 87=87, 88=88, 89=89, 90=90, 91=91, 92=92, 93=93, 94=94, 95=95, 96=96, 97=97, 98=98, 99=99, 100=100, 101=101, 102=102, 103=103, 104=104, 105=105, 106=106, 107=107, 108=108, 109=109, 110=110, 111=111, 112=112, 113=113, 114=114, 115=115, 116=116, 117=117, 118=118, 119=119, 120=120, 121=121, 122=122, 123=123, 124=124, 125=125, 126=126, 127=127, 128=128, 129=129, 130=130, 131=131, 132=132, 133=133, 134=134, 135=135, 136=136, 137=137, 138=138, 139=139, 140=140, 141=141, 142=142, 143=143, 144=144, 145=145, 146=146, 147=147, 148=148, 149=149, 150=150, 151=151, 152=152, 153=153, 154=154, 155=155, 156=156, 157=157, 158=158, 159=159, 160=160, 161=161, 162=162, 163=163, 164=164, 165=165, 166=166, 167=167, 168=168, 169=169, 170=170, 171=171, 172=172, 173=173, 174=174, 175=175, 176=176, 177=177, 178=178, 179=179, 180=180, 181=181, 182=182, 183=183, 184=184, 185=185, 186=186, 187=187, 188=188, 189=189, 190=190, 191=191, 192=192, 193=193, 194=194, 195=195, 196=196, 197=197, 198=198, 199=199, 200=200, 201=201, 202=202, 203=203, 204=204, 205=205, 206=206, 207=207, 208=208, 209=209, 210=210, 211=211, 212=212, 213=213, 214=214, 215=215, 216=216, 217=217, 218=218, 219=219, 220=220, 221=221, 222=222, 223=223, 224=224, 225=225, 226=226, 227=227, 228=228, 229=229, 230=230, 231=231, 232=232, 233=233, 234=234, 235=235, 236=236, 237=237, 238=238, 239=239, 240=240, 241=241, 242=242, 243=243, 244=244, 245=245, 246=246, 247=247, 248=248, 249=249, 250=250, 251=251, 252=252, 253=253, 254=254, 255=255, 256=256, 257=257, 258=258, 259=259, 260=260, 261=261, 262=262, 263=263, 264=264, 265=265, 266=266, 267=267, 268=268, 269=269, 270=270, 271=271, 272=272, 273=273, 274=274, 275=275, 276=276, 277=277, 278=278, 279=279, 280=280, 281=281, 282=282, 283=283, 284=284, 285=285, 286=286, 287=287, 288=288, 289=289, 290=290, 291=291, 292=292, 293=293, 294=294, 295=295, 296=296, 297=297, 298=298, 299=299, 300=300, 301=301, 302=302, 303=303, 304=304, 305=305, 306=306, 307=307, 308=308, 309=309, 310=310, 311=311, 312=312, 313=313, 314=314, 315=315, 316=316, 317=317, 318=318, 319=319, 320=320, 321=321, 322=322, 323=323, 324=324, 325=325, 326=326, 327=327, 328=328, 329=329, 330=330, 331=331, 332=332, 333=333, 334=334, 335=335, 336=336, 337=337, 338=338, 339=339, 340=340, 341=341, 342=342, 343=343, 344=344, 345=345, 346=346, 347=347, 348=348, 349=349, 350=350, 351=351, 352=352, 353=353, 354=354, 355=355, 356=356, 357=357, 358=358, 359=359, 360=360, 361=361, 362=362, 363=363, 364=364, 365=365, 366=366, 367=367, 368=368, 369=369, 370=370, 371=371, 372=372, 373=373, 374=374, 375=375, 376=376, 377=377, 378=378, 379=379, 380=380, 381=381, 382=382, 383=383, 384=384, 385=385, 386=386, 387=387, 388=388, 389=389, 390=390, 391=391, 392=392, 393=393, 394=394, 395=395, 396=396, 397=397, 398=398, 399=399, 400=400, 401=401, 402=402, 403=403, 404=404, 405=405, 406=406, 407=407, 408=408, 409=409, 410=410, 411=411, 412=412, 413=413, 414=414, 415=415, 416=416, 417=417, 418=418, 419=419, 420=420, 421=421, 422=422, 423=423, 424=424, 425=425, 426=426, 427=427, 428=428, 429=429, 430=430, 431=431, 432=432, 433=433, 434=434, 435=435, 436=436, 437=437, 438=438, 439=439, 440=440, 441=441, 442=442, 443=443, 444=444, 445=445, 446=446, 447=447, 448=448, 449=449, 450=450, 451=451, 452=452, 453=453, 454=454, 455=455, 456=456, 457=457, 458=458, 459=459, 460=460, 461=461, 462=462, 463=463, 464=464, 465=465, 466=466, 467=467, 468=468, 469=469, 470=470, 471=471, 472=472, 473=473, 474=474, 475=475, 476=476, 477=477, 478=478, 479=479, 480=480, 481=481, 482=482, 483=483, 484=484, 485=485, 486=486, 487=487, 488=488, 489=489, 490=490, 491=491, 492=492, 493=493, 494=494, 495=495, 496=496, 497=497, 498=498, 499=499, 500=500, 501=501, 502=502, 503=503, 504=504, 505=505, 506=506, 507=507, 508=508, 509=509, 510=510, 511=511, 512=512, 513=513, 514=514, 515=515, 516=516, 517=517, 518=518, 519=519, 520=520, 521=521, 522=522, 523=523, 524=524, 525=525, 526=526, 527=527, 528=528, 529=529, 530=530, 531=531, 532=532, 533=533, 534=534, 535=535, 536=536, 537=537, 538=538, 539=539, 540=540, 541=541, 542=542, 543=543, 544=544, 545=545, 546=546, 547=547, 548=548, 549=549, 550=550, 551=551, 552=552, 553=553, 554=554, 555=555, 556=556, 557=557, 558=558, 559=559, 560=560, 561=561, 562=562, 563=563, 564=564, 565=565, 566=566, 567=567, 568=568, 569=569, 570=570, 571=571, 572=572, 573=573, 574=574, 575=575, 576=576, 577=577, 578=578, 579=579, 580=580, 581=581, 582=582, 583=583, 584=584, 585=585, 586=586, 587=587, 588=588, 589=589, 590=590, 591=591, 592=592, 593=593, 594=594, 595=595, 596=596, 597=597, 598=598, 599=599, 600=600, 601=601, 602=602, 603=603, 604=604, 605=605, 606=606, 607=607, 608=608, 609=609, 610=610, 611=611, 612=612, 613=613, 614=614, 615=615, 616=616, 617=617, 618=618, 619=619, 620=620, 621=621, 622=622, 623=623, 624=624, 625=625, 626=626, 627=627, 628=628, 629=629, 630=630, 631=631, 632=632, 633=633, 634=634, 635=635, 636=636, 637=637, 638=638, 639=639, 640=640, 641=641, 642=642, 643=643, 644=644, 645=645, 646=646, 647=647, 648=648, 649=649, 650=650, 651=651, 652=652, 653=653, 654=654, 655=655, 656=656, 657=657, 658=658, 659=659, 660=660, 661=661, 662=662, 663=663, 664=664, 665=665, 666=666, 667=667, 668=668, 669=669, 670=670, 671=671, 672=672, 673=673, 674=674, 675=675, 676=676, 677=677, 678=678, 679=679, 680=680, 681=681, 682=682, 683=683, 684=684, 685=685, 686=686, 687=687, 688=688, 689=689, 690=690, 691=691, 692=692, 693=693, 694=694, 695=695, 696=696, 697=697, 698=698, 699=699, 700=700, 701=701, 702=702, 703=703, 704=704, 705=705, 706=706, 707=707, 708=708, 709=709, 710=710, 711=711, 712=712, 713=713, 714=714, 715=715, 716=716, 717=717, 718=718, 719=719, 720=720, 721=721, 722=722, 723=723, 724=724, 725=725, 726=726, 727=727, 728=728, 729=729, 730=730, 731=731, 732=732, 733=733, 734=734, 735=735, 736=736, 737=737, 738=738, 739=739, 740=740, 741=741, 742=742, 743=743, 744=744, 745=745, 746=746, 747=747, 748=748, 749=749, 750=750, 751=751, 752=752, 753=753, 754=754, 755=755, 756=756, 757=757, 758=758, 759=759, 760=760, 761=761, 762=762, 763=763, 764=764, 765=765, 766=766, 767=767, 768=768, 769=769, 770=770, 771=771, 772=772, 773=773, 774=774, 775=775, 776=776, 777=777, 778=778, 779=779, 780=780, 781=781, 782=782, 783=783, 784=784, 785=785, 786=786, 787=787, 788=788, 789=789, 790=790, 791=791, 792=792, 793=793, 794=794, 795=795, 796=796, 797=797, 798=798, 799=799, 800=800, 801=801, 802=802, 803=803, 804=804, 805=805, 806=806, 807=807, 808=808, 809=809, 810=810, 811=811, 812=812, 813=813, 814=814, 815=815, 816=816, 817=817, 818=818, 819=819, 820=820, 821=821, 822=822, 823=823, 824=824, 825=825, 826=826, 827=827, 828=828, 829=829, 830=830, 831=831, 832=832, 833=833, 834=834, 835=835, 836=836, 837=837, 838=838, 839=839, 840=840, 841=841, 842=842, 843=843, 844=844, 845=845, 846=846, 847=847, 848=848, 849=849, 850=850, 851=851, 852=852, 853=853, 854=854, 855=855, 856=856, 857=857, 858=858, 859=859, 860=860, 861=861, 862=862, 863=863, 864=864, 865=865, 866=866, 867=867, 868=868, 869=869, 870=870, 871=871, 872=872, 873=873, 874=874, 875=875, 876=876, 877=877, 878=878, 879=879, 880=880, 881=881, 882=882, 883=883, 884=884, 885=885, 886=886, 887=887, 888=888, 889=889, 890=890, 891=891, 892=892, 893=893, 894=894, 895=895, 896=896, 897=897, 898=898, 899=899, 900=900, 901=901, 902=902, 903=903, 904=904, 905=905, 906=906, 907=907, 908=908, 909=909, 910=910, 911=911, 912=912, 913=913, 914=914, 915=915, 916=916, 917=917, 918=918, 919=919, 920=920, 921=921, 922=922, 923=923, 924=924, 925=925, 926=926, 927=927, 928=928, 929=929, 930=930, 931=931, 932=932, 933=933, 934=934, 935=935, 936=936, 937=937, 938=938, 939=939, 940=940, 941=941, 942=942, 943=943, 944=944, 945=945, 946=946, 947=947, 948=948, 949=949, 950=950, 951=951, 952=952, 953=953, 954=954, 955=955, 956=956, 957=957, 958=958, 959=959, 960=960, 961=961, 962=962, 963=963, 964=964, 965=965, 966=966, 967=967, 968=968, 969=969, 970=970, 971=971, 972=972, 973=973, 974=974, 975=975, 976=976, 977=977, 978=978, 979=979, 980=980, 981=981, 982=982, 983=983, 984=984, 985=985, 986=986, 987=987, 988=988, 989=989, 990=990, 991=991, 992=992, 993=993, 994=994, 995=995, 996=996, 997=997, 998=998, 999=999, 1000=1000, 1001=1001, 1002=1002, 1003=1003, 1004=1004, 1005=1005, 1006=1006, 1007=1007, 1008=1008, 1009=1009, 1010=1010, 1011=1011, 1012=1012, 1013=1013, 1014=1014, 1015=1015, 1016=1016, 1017=1017, 1018=1018, 1019=1019, 1020=1020, 1021=1021, 1022=1022, 1023=1023, 1024=1024, 1025=1025, 1026=1026, 1027=1027, 1028=1028, 1029=1029, 1030=1030, 1031=1031, 1032=1032, 1033=1033, 1034=1034, 1035=1035, 1036=1036, 1037=1037, 1038=1038, 1039=1039, 1040=1040, 1041=1041, 1042=1042, 1043=1043, 1044=1044, 1045=1045, 1046=1046, 1047=1047, 1048=1048, 1049=1049, 1050=1050, 1051=1051, 1052=1052, 1053=1053, 1054=1054, 1055=1055, 1056=1056, 1057=1057, 1058=1058, 1059=1059, 1060=1060, 1061=1061, 1062=1062, 1063=1063, 1064=1064, 1065=1065, 1066=1066, 1067=1067, 1068=1068, 1069=1069, 1070=1070, 1071=1071, 1072=1072, 1073=1073, 1074=1074, 1075=1075, 1076=1076, 1077=1077, 1078=1078, 1079=1079, 1080=1080, 1081=1081, 1082=1082, 1083=1083, 1084=1084, 1085=1085, 1086=1086, 1087=1087, 1088=1088, 1089=1089, 1090=1090, 1091=1091, 1092=1092, 1093=1093, 1094=1094, 1095=1095, 1096=1096, 1097=1097, 1098=1098, 1099=1099, 1100=1100, 1101=1101, 1102=1102, 1103=1103, 1104=1104, 1105=1105, 1106=1106, 1107=1107, 1108=1108, 1109=1109, 1110=1110, 1111=1111, 1112=1112, 1113=1113, 1114=1114, 1115=1115, 1116=1116, 1117=1117, 1118=1118, 1119=1119, 1120=1120, 1121=1121, 1122=1122, 1123=1123, 1124=1124, 1125=1125, 1126=1126, 1127=1127, 1128=1128, 1129=1129, 1130=1130, 1131=1131, 1132=1132, 1133=1133, 1134=1134, 1135=1135, 1136=1136, 1137=1137, 1138=1138, 1139=1139, 1140=1140, 1141=1141, 1142=1142, 1143=1143, 1144=1144, 1145=1145, 1146=1146, 1147=1147, 1148=1148, 1149=1149, 1150=1150, 1151=1151, 1152=1152, 1153=1153, 1154=1154, 1155=1155, 1156=1156, 1157=1157, 1158=1158, 1159=1159, 1160=1160, 1161=1161, 1162=1162, 1163=1163, 1164=1164, 1165=1165, 1166=1166, 1167=1167, 1168=1168, 1169=1169, 1170=1170, 1171=1171, 1172=1172, 1173=1173, 1174=1174, 1175=1175, 1176=1176, 1177=1177, 1178=1178, 1179=1179, 1180=1180, 1181=1181, 1182=1182, 1183=1183, 1184=1184, 1185=1185, 1186=1186, 1187=1187, 1188=1188, 1189=1189, 1190=1190, 1191=1191, 1192=1192, 1193=1193, 1194=1194, 1195=1195, 1196=1196, 1197=1197, 1198=1198, 1199=1199, 1200=1200, 1201=1201, 1202=1202, 1203=1203, 1204=1204, 1205=1205, 1206=1206, 1207=1207, 1208=1208, 1209=1209, 1210=1210, 1211=1211, 1212=1212, 1213=1213, 1214=1214, 1215=1215, 1216=1216, 1217=1217, 1218=1218, 1219=1219, 1220=1220, 1221=1221, 1222=1222, 1223=1223, 1224=1224, 1225=1225, 1226=1226, 1227=1227, 1228=1228, 1229=1229, 1230=1230, 1231=1231, 1232=1232, 1233=1233, 1234=1234, 1235=1235, 1236=1236, 1237=1237, 1238=1238, 1239=1239, 1240=1240, 1241=1241, 1242=1242, 1243=1243, 1244=1244, 1245=1245, 1246=1246, 1247=1247, 1248=1248, 1249=1249, 1250=1250, 1251=1251, 1252=1252, 1253=1253, 1254=1254, 1255=1255, 1256=1256, 1257=1257, 1258=1258, 1259=1259, 1260=1260, 1261=1261, 1262=1262, 1263=1263, 1264=1264, 1265=1265, 1266=1266, 1267=1267, 1268=1268, 1269=1269, 1270=1270, 1271=1271, 1272=1272, 1273=1273, 1274=1274, 1275=1275, 1276=1276, 1277=1277, 1278=1278, 1279=1279, 1280=1280, 1281=1281, 1282=1282, 1283=1283, 1284=1284, 1285=1285, 1286=1286, 1287=1287, 1288=1288, 1289=1289, 1290=1290, 1291=1291, 1292=1292, 1293=1293, 1294=1294, 1295=1295, 1296=1296, 1297=1297, 1298=1298, 1299=1299, 1300=1300, 1301=1301, 1302=1302, 1303=1303, 1304=1304, 1305=1305, 1306=1306, 1307=1307, 1308=1308, 1309=1309, 1310=1310, 1311=1311, 1312=1312, 1313=1313, 1314=1314, 1315=1315, 1316=1316, 1317=1317, 1318=1318, 1319=1319, 1320=1320, 1321=1321, 1322=1322, 1323=1323, 1324=1324, 1325=1325, 1326=1326, 1327=1327, 1328=1328, 1329=1329, 1330=1330, 1331=1331, 1332=1332, 1333=1333, 1334=1334, 1335=1335, 1336=1336, 1337=1337, 1338=1338, 1339=1339, 1340=1340, 1341=1341, 1342=1342, 1343=1343, 1344=1344, 1345=1345, 1346=1346, 1347=1347, 1348=1348, 1349=1349, 1350=1350, 1351=1351, 1352=1352, 1353=1353, 1354=1354, 1355=1355, 1356=1356, 1357=1357, 1358=1358, 1359=1359, 1360=1360, 1361=1361, 1362=1362, 1363=1363, 1364=1364, 1365=1365, 1366=1366, 1367=1367, 1368=1368, 1369=1369, 1370=1370, 1371=1371, 1372=1372, 1373=1373, 1374=1374, 1375=1375, 1376=1376, 1377=1377, 1378=1378, 1379=1379, 1380=1380, 1381=1381, 1382=1382, 1383=1383, 1384=1384, 1385=1385, 1386=1386, 1387=1387, 1388=1388, 1389=1389, 1390=1390, 1391=1391, 1392=1392, 1393=1393, 1394=1394, 1395=1395, 1396=1396, 1397=1397, 1398=1398, 1399=1399, 1400=1400, 1401=1401, 1402=1402, 1403=1403, 1404=1404, 1405=1405, 1406=1406, 1407=1407, 1408=1408, 1409=1409, 1410=1410, 1411=1411, 1412=1412, 1413=1413, 1414=1414, 1415=1415, 1416=1416, 1417=1417, 1418=1418, 1419=1419, 1420=1420, 1421=1421, 1422=1422, 1423=1423, 1424=1424, 1425=1425, 1426=1426, 1427=1427, 1428=1428, 1429=1429, 1430=1430, 1431=1431, 1432=1432, 1433=1433, 1434=1434, 1435=1435, 1436=1436, 1437=1437, 1438=1438, 1439=1439, 1440=1440, 1441=1441, 1442=1442, 1443=1443, 1444=1444, 1445=1445, 1446=1446, 1447=1447, 1448=1448, 1449=1449, 1450=1450, 1451=1451, 1452=1452, 1453=1453, 1454=1454, 1455=1455, 1456=1456, 1457=1457, 1458=1458, 1459=1459, 1460=1460, 1461=1461, 1462=1462, 1463=1463, 1464=1464, 1465=1465, 1466=1466, 1467=1467, 1468=1468, 1469=1469, 1470=1470, 1471=1471, 1472=1472, 1473=1473, 1474=1474, 1475=1475, 1476=1476, 1477=1477, 1478=1478, 1479=1479, 1480=1480, 1481=1481, 1482=1482, 1483=1483, 1484=1484, 1485=1485, 1486=1486, 1487=1487, 1488=1488, 1489=1489, 1490=1490, 1491=1491, 1492=1492, 1493=1493, 1494=1494, 1495=1495, 1496=1496, 1497=1497, 1498=1498, 1499=1499, 1500=1500, 1501=1501, 1502=1502, 1503=1503, 1504=1504, 1505=1505, 1506=1506, 1507=1507, 1508=1508, 1509=1509, 1510=1510, 1511=1511, 1512=1512, 1513=1513, 1514=1514, 1515=1515, 1516=1516, 1517=1517, 1518=1518, 1519=1519, 1520=1520, 1521=1521, 1522=1522, 1523=1523, 1524=1524, 1525=1525, 1526=1526, 1527=1527, 1528=1528, 1529=1529, 1530=1530, 1531=1531, 1532=1532, 1533=1533, 1534=1534, 1535=1535, 1536=1536, 1537=1537, 1538=1538, 1539=1539, 1540=1540, 1541=1541, 1542=1542, 1543=1543, 1544=1544, 1545=1545, 1546=1546, 1547=1547, 1548=1548, 1549=1549, 1550=1550, 1551=1551, 1552=1552, 1553=1553, 1554=1554, 1555=1555, 1556=1556, 1557=1557, 1558=1558, 1559=1559, 1560=1560, 1561=1561, 1562=1562, 1563=1563, 1564=1564, 1565=1565, 1566=1566, 1567=1567, 1568=1568, 1569=1569, 1570=1570, 1571=1571, 1572=1572, 1573=1573, 1574=1574, 1575=1575, 1576=1576, 1577=1577, 1578=1578, 1579=1579, 1580=1580, 1581=1581, 1582=1582, 1583=1583, 1584=1584, 1585=1585, 1586=1586, 1587=1587, 1588=1588, 1589=1589, 1590=1590, 1591=1591, 1592=1592, 1593=1593, 1594=1594, 1595=1595, 1596=1596, 1597=1597, 1598=1598, 1599=1599, 1600=1600, 1601=1601, 1602=1602, 1603=1603, 1604=1604, 1605=1605, 1606=1606, 1607=1607, 1608=1608, 1609=1609, 1610=1610, 1611=1611, 1612=1612, 1613=1613, 1614=1614, 1615=1615, 1616=1616, 1617=1617, 1618=1618, 1619=1619, 1620=1620, 1621=1621, 1622=1622, 1623=1623, 1624=1624, 1625=1625, 1626=1626, 1627=1627, 1628=1628, 1629=1629, 1630=1630, 1631=1631, 1632=1632, 1633=1633, 1634=1634, 1635=1635, 1636=1636, 1637=1637, 1638=1638, 1639=1639, 1640=1640, 1641=1641, 1642=1642, 1643=1643, 1644=1644, 1645=1645, 1646=1646, 1647=1647, 1648=1648, 1649=1649, 1650=1650, 1651=1651, 1652=1652, 1653=1653, 1654=1654, 1655=1655, 1656=1656, 1657=1657, 1658=1658, 1659=1659, 1660=1660, 1661=1661, 1662=1662, 1663=1663, 1664=1664, 1665=1665, 1666=1666, 1667=1667, 1668=1668, 1669=1669, 1670=1670, 1671=1671, 1672=1672, 1673=1673, 1674=1674, 1675=1675, 1676=1676, 1677=1677, 1678=1678, 1679=1679, 1680=1680, 1681=1681, 1682=1682, 1683=1683, 1684=1684, 1685=1685, 1686=1686, 1687=1687, 1688=1688, 1689=1689, 1690=1690, 1691=1691, 1692=1692, 1693=1693, 1694=1694, 1695=1695, 1696=1696, 1697=1697, 1698=1698, 1699=1699, 1700=1700, 1701=1701, 1702=1702, 1703=1703, 1704=1704, 1705=1705, 1706=1706, 1707=1707, 1708=1708, 1709=1709, 1710=1710, 1711=1711, 1712=1712, 1713=1713, 1714=1714, 1715=1715, 1716=1716, 1717=1717, 1718=1718, 1719=1719, 1720=1720, 1721=1721, 1722=1722, 1723=1723, 1724=1724, 1725=1725, 1726=1726, 1727=1727, 1728=1728, 1729=1729, 1730=1730, 1731=1731, 1732=1732, 1733=1733, 1734=1734, 1735=1735, 1736=1736, 1737=1737, 1738=1738, 1739=1739, 1740=1740, 1741=1741, 1742=1742, 1743=1743, 1744=1744, 1745=1745, 1746=1746, 1747=1747, 1748=1748, 1749=1749, 1750=1750, 1751=1751, 1752=1752, 1753=1753, 1754=1754, 1755=1755, 1756=1756, 1757=1757, 1758=1758, 1759=1759, 1760=1760, 1761=1761, 1762=1762, 1763=1763, 1764=1764, 1765=1765, 1766=1766, 1767=1767, 1768=1768, 1769=1769, 1770=1770, 1771=1771, 1772=1772, 1773=1773, 1774=1774, 1775=1775, 1776=1776, 1777=1777, 1778=1778, 1779=1779, 1780=1780, 1781=1781, 1782=1782, 1783=1783, 1784=1784, 1785=1785, 1786=1786, 1787=1787, 1788=1788, 1789=1789, 1790=1790, 1791=1791, 1792=1792, 1793=1793, 1794=1794, 1795=1795, 1796=1796, 1797=1797, 1798=1798, 1799=1799, 1800=1800, 1801=1801, 1802=1802, 1803=1803, 1804=1804, 1805=1805, 1806=1806, 1807=1807, 1808=1808, 1809=1809, 1810=1810, 1811=1811, 1812=1812, 1813=1813, 1814=1814, 1815=1815, 1816=1816, 1817=1817, 1818=1818, 1819=1819, 1820=1820, 1821=1821, 1822=1822, 1823=1823, 1824=1824, 1825=1825, 1826=1826, 1827=1827, 1828=1828, 1829=1829, 1830=1830, 1831=1831, 1832=1832, 1833=1833, 1834=1834, 1835=1835, 1836=1836, 1837=1837, 1838=1838, 1839=1839, 1840=1840, 1841=1841, 1842=1842, 1843=1843, 1844=1844, 1845=1845, 1846=1846, 1847=1847, 1848=1848, 1849=1849, 1850=1850, 1851=1851, 1852=1852, 1853=1853, 1854=1854, 1855=1855, 1856=1856, 1857=1857, 1858=1858, 1859=1859, 1860=1860, 1861=1861, 1862=1862, 1863=1863, 1864=1864, 1865=1865, 1866=1866, 1867=1867, 1868=1868, 1869=1869, 1870=1870, 1871=1871, 1872=1872, 1873=1873, 1874=1874, 1875=1875, 1876=1876, 1877=1877, 1878=1878, 1879=1879, 1880=1880, 1881=1881, 1882=1882, 1883=1883, 1884=1884, 1885=1885, 1886=1886, 1887=1887, 1888=1888, 1889=1889, 1890=1890, 1891=1891, 1892=1892, 1893=1893, 1894=1894, 1895=1895, 1896=1896, 1897=1897, 1898=1898, 1899=1899, 1900=1900, 1901=1901, 1902=1902, 1903=1903, 1904=1904, 1905=1905, 1906=1906, 1907=1907, 1908=1908, 1909=1909, 1910=1910, 1911=1911, 1912=1912, 1913=1913, 1914=1914, 1915=1915, 1916=1916, 1917=1917, 1918=1918, 1919=1919, 1920=1920, 1921=1921, 1922=1922, 1923=1923, 1924=1924, 1925=1925, 1926=1926, 1927=1927, 1928=1928, 1929=1929, 1930=1930, 1931=1931, 1932=1932, 1933=1933, 1934=1934, 1935=1935, 1936=1936, 1937=1937, 1938=1938, 1939=1939, 1940=1940, 1941=1941, 1942=1942, 1943=1943, 1944=1944, 1945=1945, 1946=1946, 1947=1947, 1948=1948, 1949=1949, 1950=1950, 1951=1951, 1952=1952, 1953=1953, 1954=1954, 1955=1955, 1956=1956, 1957=1957, 1958=1958, 1959=1959, 1960=1960, 1961=1961, 1962=1962, 1963=1963, 1964=1964, 1965=1965, 1966=1966, 1967=1967, 1968=1968, 1969=1969, 1970=1970, 1971=1971, 1972=1972, 1973=1973, 1974=1974, 1975=1975, 1976=1976, 1977=1977, 1978=1978, 1979=1979, 1980=1980, 1981=1981, 1982=1982, 1983=1983, 1984=1984, 1985=1985, 1986=1986, 1987=1987, 1988=1988, 1989=1989, 1990=1990, 1991=1991, 1992=1992, 1993=1993, 1994=1994, 1995=1995, 1996=1996, 1997=1997, 1998=1998, 1999=1999}

总结

总之，Controller本身不是线程安全的，需要开发者注意线程安全问题，并采取适当的策略来确保应用程序的线程安全。

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