红联Linux门户
Linux帮助
当前位置: 红联Linux门户 > Linux编程与内核

JAVA基础：从.class文件中寻找类名

发布时间:2006-11-22 00:36:23来源:红联作者:Heroop
可以有多种方式判断类的名字：

假定所有的类都以com，org，或者net开头
搜索classpath来寻找名字为Hack的类
搜索classpath来寻找映射到这个文件的目录入口
直接查看类自身。对于所有的情况下，这是最直接的
Java规范规定了如何查看一个class文件。存储在class文件一开始的一个值就是以Java内部分割符“/”为格式的完整的类明。

下面的代码返回了文件C:\code\hacks\research\com\generationjava\Hack.class的内部类名com/generationjava/Hack，读者可以进一步编写代码将“/”转换成“.”：

static final public int MAGIC = 0xCAFEBABE;
// 传递C:\code\hacks\research\com\generationjava\Hack.class
// 假定存在这样一个类
public String getFullyQualifiedName(String filename) throws IOException {
String name = null;

try {
DataInputStream in = new
DataInputStream(new FileInputStream(filename));
if(in.readInt() != MAGIC) {
// 不是一个.class文件
thrownew IOException("Not a class file");
}

in.readUnsignedShort();// 次版本号
in.readUnsignedShort();// 主版本号
in.readUnsignedShort();// 长度
in.readByte();// CLASS=7
in.readUnsignedShort();// 忽略这个地方
in.readByte();// UTF8=1
name =in.readUTF();//类的名字!!!
in.close();
} catch(IOException ioe) {
ioe.printStackTrace();
}

return name;
}
当你直接从.class文件中获得类的信息的时候，就简化了开发。查找一个匿名.class类文件的完整的类名是任何基于.class文件工作的应用的重要部件。
文章评论

共有 2709 条评论

  1. 72.36.192.* 于 2007-05-04 16:02:48发表:

    Good design!
    nfl football lines | fantasy baseball leagues | odds sports | sports gamble | nfl betting online | nba bet | uefa cup bet | betting web site | sports book online | ncaa baseball

  2. 72.36.192.* 于 2007-05-04 16:02:31发表:

    Great work!
    place bet | sport betting online | las vegas sportsbook | baseball pin | betting lines | baseball bases | super bowl betting odds | major league | nba betting line | online horse betting

  3. 72.36.192.* 于 2007-05-04 16:02:21发表:

    Nice site!
    betting on nba | sports betting pick | nfl sportsbook | uefa champions league bet | las vegas odds on ncaa basketball | gambling betting | online sports gambling | ultimate sports | french ligue 1 bet | basketball pick

  4. 72.36.192.* 于 2007-05-04 16:02:09发表:

    Nice site!
    how to sports bet | sports book | online sports | bet nfl | swiss super league bet | bet on baseball | baseball scoring | nba 2007 picks | free nba betting information | basketball betting

  5. 72.36.192.* 于 2007-05-03 15:51:10发表:

    Nice site!
    online sport games | atlanta baseball | sports betting advice | belgian jupiler league bet | ncaa sports | tennis betting | betting on nfl | odds nba basketball | major baseball | live bet

  6. 72.36.192.* 于 2007-05-03 15:50:29发表:

    Nice site!
    online nba gambling | best baseball player | ncaa betting | best baseball players | las vegas odds on ncaa basketball | college odds | sport gambling | nfl pick | college football betting odds | nascar bet bet

  7. 72.36.192.* 于 2007-05-03 15:50:05发表:

    Thank you!
    baltimore baseball | online betting site | betting line | mlb odds | sports rules | baseball online | sportsbook betting | basketball futures | sports ncaa basketball | online sports games

  8. 72.36.192.* 于 2007-05-03 15:49:50发表:

    Well done!
    online sports bets | champions league betting | nba picks | us masters bets | hockey betting | nba props | sports betting com | football game odds | cleveland baseball | uefa cup lines

  9. 72.36.192.* 于 2007-05-03 15:49:40发表:

    Well done!
    baseball simulation | nascar odds odds | scottish league cup bet | odds on college basketball | playoff odds | major league | bet odds | football picks | sportsbook bonus | nfl betting lines

  10. 72.36.192.* 于 2007-05-02 19:59:02发表:

    Thank you!
    harry potter ringtones | free wwe ringtones | ctu ring tone | hifi ringtones | motorola keypress ringtones | ringtones for verizon | free christian ringtones | mp3 ringtone converter | free ringtone download | free suncom ringtones

  11. 72.36.192.* 于 2007-05-02 19:58:34发表:

    Nice site!
    ringtones download | lg free ringtones | free sms ringtones | us cellular ringtones | monophonic ringtones | free phone ringtones | hindi ringtone | mosquito ringtone | ringtones for nextel | lg ringtones

  12. 72.36.192.* 于 2007-05-02 19:58:10发表:

    Nice site!
    free cingular cell phone ringtones | free ringtone | download free ringtone | free cellular ringtones | 24 ringtones | verizon ringtones | free ringtones for alltel | free midi ringtones | ringtones wav | ringtones composer

  13. 72.36.192.* 于 2007-05-02 19:57:58发表:

    Nice site!
    free ringtones for boost mobile | razr ringtones | simpsons ringtone | ringtones midi | free ringtones for nokia | free ringtones for samsung | free country music ringtones | free ringtones alltel | free ringtones for cingular | free ringtones download

  14. 72.36.192.* 于 2007-05-02 19:57:49发表:

    Good design!
    24 ringtone free | motorola ringtones | free polyphonic ringtone download | free ringtones | crazy frog ring tone | us cellular ring tones | nokia ringtone | ringtone websites | free kyocera ringtones | t mobile ringtones

  15. 72.36.192.* 于 2007-05-01 15:15:21发表:

    Good design!
    roulette download | poker usa | joker poker | flash casino | free money no deposit | flash casinos | free cleopatra slots | absolute poker | free casino games online | monopoly slots

  16. 72.36.192.* 于 2007-05-01 15:15:07发表:

    Good design!
    online poker games | empire poker | black jack game | free casino downloads | video slot games | slot machines games | gambling games | online casinos | poker game | play roulette free

  17. 72.36.192.* 于 2007-05-01 15:14:54发表:

    Well done!
    download free poker game | us poker sites | free slot machine | games on line | online video slots | free joker poker | blackjack download | blackjack online free | poker online | poker games online

  18. 72.36.192.* 于 2007-05-01 15:14:43发表:

    Nice site!
    free casino games | black jack games | no deposit bonus casinos | play bingo | play free slots online | free online slots | free casino | free slots | texas holdem free | free money casino

  19. 72.36.192.* 于 2007-05-01 15:14:32发表:

    Well done!
    free slots | video slots | no deposit casino bonus | free internet poker | play blackjack | free casino bonus | free blackjack games | cleopatra slot machine | roulette game | online free blackjack

  20. 72.36.192.* 于 2007-04-30 13:35:11发表:

    Good design!
    games online | black jack download | roulette free | new no deposit casino | poker bonus | games on line | slim slots free | free online slot games | slots for fun | slim slots

  21. 72.36.192.* 于 2007-04-30 13:34:36发表:

    Thank you!
    free online blackjack | strip black jack | video slots | download free poker game | free sims slots | free poker download | video slot machine | no deposit casinos | poker star | free poker

  22. 72.36.192.* 于 2007-04-30 13:34:16发表:

    Great work!
    free texas holdem poker | online roulette game | play slots | russian roulette game | online casino bonus | free slot machine downloads | free blackjack online | poker texas | free online slot machine | casino on net

  23. 72.36.192.* 于 2007-04-30 13:34:01发表:

    Great work!
    online black jack | free slots online | free slot machine | texas hold em online | poker online free | free black jack games | online blackjack free | poker for fun | free online texas hold em | flash casinos

  24. 72.36.192.* 于 2007-04-30 13:33:50发表:

    Thank you!
    flash casino games | free online bingo | blackjack game | free casino | online roulette | free bingo | video slots free | free money no deposit | online roulette free | slot machines games

  25. 72.36.192.* 于 2007-04-29 17:22:23发表:

    Thank you!
    free online bingo games | planet poker | poker software | cleopatra slots | slot machine game | play poker | free online strip blackjack | no deposit bingo | free video slots | play roulette

  26. 72.36.192.* 于 2007-04-29 17:21:48发表:

    Well done!
    free on line slots | play free online slots | play slot machines for free | casino slots | joker poker | online holdem | free poker on line | free gambling games | absolute poker | on line gambling

  27. 72.36.192.* 于 2007-04-29 17:21:26发表:

    Good design!
    free online poker | black jack free | paradise poker | casino bonus | free poker online | roulette online | free monopoly online | bonus casino free online | texas holdem free online | free black jack games

  28. 72.36.192.* 于 2007-04-29 17:21:11发表:

    Great work!
    no download casino | play free roulette | free slots no downloads | black jack download | free slots for fun | slot machines | free fun slots | slots games | online poker sites | online video slots

  29. 72.36.192.* 于 2007-04-29 17:21:00发表:

    Great work!
    poker usa | cleopatra slot machine | poker game download | online texas hold em | free casino | bonus casino online | poker game free | poker downloads | online strip blackjack | casino black jack

  30. 72.36.192.* 于 2007-04-28 18:10:17发表:

    Nice site!
    motorola ring tones | free midi ringtone | free cingular ringtones | cingular ringtones | mp3 ringtone converter | free ring tones | free ringtones us cellular | ctu ringtones | free t mobile ringtones | download free polyphonic ringtones

  31. 72.36.192.* 于 2007-04-28 18:09:59发表:

    Thank you!
    hindi ringtone | ringtones 24 | free hifi ringtones | free nokia downloads | nextel ringtone program | us cellular ringtones | free 24 ringtone | simpsons ringtone | free nascar ringtones | free lg ringtones

  32. 72.36.192.* 于 2007-04-28 18:09:34发表:

    Thank you!
    download free ringtones | ringtone websites | free sprint pcs ringtones | 24 ctu ringtone verizon | ringtone nokia | cellular south | free ringtones for alltel | free centennial wireless ringtones | free ringtones for sprint phones | wav ringtones

  33. 72.36.192.* 于 2007-04-28 18:08:58发表:

    Great work!
    crazy frog ringtone | country ringtones | midi ringtones | composer ringtones | free ringtone | download free mp3 ringtones | motorola mp3 ringtones | ringtone mp3 | voice ringtone | free 24 ringtones

  34. 72.36.192.* 于 2007-04-28 18:08:42发表:

    Thank you!
    star wars ringtone | verizon ctu ringtone | cellular one ringtones | free ringtones samsung | ringtones for cingular | free sprint ringtones | download free ringtone | free hi fi ringtones | hifi ringtones | free ringtones motorola

  35. 72.36.211.* 于 2007-04-27 12:45:42发表:

    Good design!
    free monopoly online | games download | texas holdem poker | play slots | free online slot machine games | no deposit casino bonuses | strip blackjack online | slots of fun

  36. 72.36.211.* 于 2007-04-27 12:45:18发表:

    Thank you!
    free online gambling | free slots | slots for fun | online slot games | russian roulette game | free online poker game | free casinos | caribbean stud poker | texas holdem free | play roulette free

  37. 72.36.211.* 于 2007-04-27 12:45:03发表:

    Well done!
    play roulette | free casino downloads | free poker money | strip blackjack game | poker for fun | free video slots | online bingo games | slot machines free | casino deposit bonus | free casino games online

  38. 72.36.211.* 于 2007-04-27 12:44:52发表:

    Nice site!
    play poker online | blackjack game | party poker download | free slots machines | online poker usa | pai gow poker | free strip black jack | online holdem | casino free | free online casinos

  39. 72.36.211.* 于 2007-04-27 12:44:39发表:

    Thank you!
    free strip blackjack | games slots | best usa casino online | no limit texas hold em | online poker | free slots online | download poker games | poker game | free online black jack | play bingo online

  40. 72.36.211.* 于 2007-04-26 16:08:38发表:

    Good design!
    no deposit casinos | free bonus slots | free slots | online slots free | games online | casinos on line | slots for free | online texas hold em | download free poker games | gambling machines

  1. 锟斤拷页锟斤拷一页 48 49 50 51 52 锟斤拷一页 尾页

频道文章

最新教程

随机推荐

关于我们 | 合作 | 联系我们

© linuxdiyf.com 红联Linux门户 版权所有