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. 72.232.172.* 于 2007-04-08 17:30:46发表:

    Great work!
    play poker for free | casinos online | monopoly online | free sims slots | slim slots | blackjack software | poker games | free slot machine game | no deposit bonuses | free slot machines online

  2. 72.232.172.* 于 2007-04-08 17:29:21发表:

    Nice site!
    free blackjack games | play texas hold em | online slots free | casino game download | bingo online | on line casinos | free poker sites | noble poker | online poker usa | blackjack online free

  3. 72.232.172.* 于 2007-04-08 17:28:08发表:

    Great work!
    slots online | free blackjack game | slot machine software | keno online | poker game | live poker | play slot machines for free | russian roulette game | download poker game | poker free download

  4. 72.232.172.* 于 2007-04-08 17:27:10发表:

    Thank you!
    free gambling games | games on line | online casino games | online poker | texas holdem online | free slots | casino slots | casino open usa | roulette download | no deposit bonus casinos

  5. 72.232.172.* 于 2007-04-07 17:43:53发表:

    Good design!
    tmobile ringtones | ringtones 24 | midi ringtone | free ringtones download | 24 ctu ringtone verizon | free mp3 ringtones download | ctu ringtone verizon | cisco ringtones | free polyphonic | ringtones mp3 free

  6. 72.232.172.* 于 2007-04-07 17:43:08发表:

    Good design!
    crazy frog ringtone | funny ringtone | country ringtones | nextel ringtone program | harry potter ringtones | motorola ringtones free | voice ringtone | free mp3 ringtone download | jamster ringtones | free ringtones alltel

  7. 72.232.172.* 于 2007-04-07 17:42:23发表:

    Thank you!
    funny ringtones free | ringtone motorola | lg free ringtones | free ringtones us cellular | nokia ringtones | anime ringtones | free nextel ringtone downloads | ringtone nokia | star wars ringtones | ringtones for suncom

  8. 72.232.172.* 于 2007-04-07 17:41:53发表:

    Nice site!
    nokia download | ringtones for verizon | free ringtones samsung | free downloadable ringtones | free cellular ringtones | motorola razr v3 ringtones | free sprint pcs ringtones | free ringtones for cellular south | free cell phone ring tones | ringtones midi

  9. 72.232.172.* 于 2007-04-07 17:41:06发表:

    Nice site!
    free ringtones for alltel | free phone ringtones | ringtone uploader | funny ringtones | ringtone composer | absolutely free ringtones | lg ringtones | free phone downloads | samsung free ringtones | real tone ringtones

  10. 72.232.172.* 于 2007-04-06 18:53:59发表:

    Great work!
    ringtone download | ringtones for motorola | nascar ringtones | nokia free download | free ringtones for tracfones | motorola ringtones | ringtones for motorola q | christian ringtones | free ringtones for nextel | free ring tones

  11. 72.232.172.* 于 2007-04-06 18:53:20发表:

    Good design!
    funny ringtone | ringtone composer | free ringtones for sprint | funny ringtones free | 24 ring tones | free alltel ringtones | free country music ringtones | ringtones for alltel | cheap ringtones | lg free ringtones

  12. 72.232.172.* 于 2007-04-06 18:52:33发表:

    Good design!
    ringtone 24 ctu | free nascar ringtones | real ringtones | wwe ringtones | free ringtones for t mobile | boost ringtones | free ringtones for cellular south | centennial wireless ringtones | free nokia ringtones | cell phone ringtones

  13. 72.232.172.* 于 2007-04-06 18:52:04发表:

    Great work!
    24 ringtones | free cell phone ringtones | us cellular ring tones | simpsons ringtone | free wav ringtones | bollywood ringtones | free ringtone converter | download ringtones | free ringtone | free anime ringtones

  14. 72.232.172.* 于 2007-04-06 18:51:23发表:

    Nice site!
    free gospel ringtones | free ringtones for sprint phones | free ringtone | free phone ringtones | free blackberry ringtones | samsung free ringtones | sprint ringtones | free polyphonic ringtone download | verizon ringtones free | mp3 ringtones download

  15. 65.110.43.* 于 2007-04-05 16:38:58发表:

    Well done!
    free on line slots | free online blackjack | new no deposit casino | casino online download | free poker games online | free no deposit casinos | free poker downloads | casinos on line | free online roulette | best online casinos

  16. 65.110.43.* 于 2007-04-05 16:38:22发表:

    Great work!
    3 card poker | free black jack games | play bingo | free poker game | free games on line | free poker online | poker bonus | no deposit casino | free online bingo games | texas holdem

  17. 65.110.43.* 于 2007-04-05 16:37:59发表:

    Well done!
    slot machine games free | no limit texas hold em | online casino | caribbean stud poker | keno online | blackjack games | free roulette | free online casinos | free slots games | computer poker

  18. 65.110.43.* 于 2007-04-05 16:37:28发表:

    Thank you!
    sim slots | online free roulette | stud poker | video slots | online texas holdem | black jack game | free fun slots | casino slots | free black jack game | free online poker game

  19. 65.110.43.* 于 2007-04-05 16:36:52发表:

    Well done!
    free on line slots | free online blackjack | new no deposit casino | casino online download | free poker games online | free no deposit casinos | free poker downloads | casinos on line | free online roulette | best online casinos

  20. 65.110.43.* 于 2007-04-05 16:35:25发表:

    Well done!
    free online black jack | slot machines free | free gambling games | free casino game | free poker websites | poker online free | online roulette | video slot machines | free casino cash | games online

  21. 65.110.43.* 于 2007-04-04 15:21:33发表:

    Thank you!
    free online texas holdem | free slots download | free black jack game | slot machines | paradise poker | new no deposit online casinos | free blackjack games | blackjack online free | strip black jack | free internet poker

  22. 65.110.43.* 于 2007-04-04 15:20:45发表:

    Nice site!
    free slots machines | play bingo | free online slots games | free casinos | free slot machines | pai gow poker | games online | casino free | free casino slot | play blackjack online

  23. 72.232.250.* 于 2007-04-04 15:20:05发表:

    Great work!
    casino deposit bonus | poker star | blackjack download | poker game free | free poker websites | free joker poker | best online casino games | play slots | free online slots no downloads | no limit texas hold em

  24. 65.110.43.* 于 2007-04-04 15:19:37发表:

    Nice site!
    star poker | online gambling sites | free bingo games | free games on line | slot machine | video poker | noble poker | caribbean stud poker | free roulette | on line poker

  25. 72.232.250.* 于 2007-04-04 15:19:07发表:

    Thank you!
    free online video slots | free money casino | free video slot games | casino free games | free online casino games | free money no deposit casinos | free three card poker | online strip blackjack | strip blackjack game | play texas holdem

  26. 65.110.43.* 于 2007-04-03 14:16:00发表:

    Great work!
    free samsung ringtones | free ringtones lg | nextel ringtone | mobile phone ringtones | mobile ringtones | ringtones composer | free ring tones | mp3 ringtone download | free mp3 tones | free nextel downloads

  27. 72.232.250.* 于 2007-04-03 14:15:33发表:

    Great work!
    hindi ringtone | free real ringtones | 24 ringtone free | real music ringtones | free ringtones for cellular south | ctu ring tone | free real music ringtones | free ringtones verizon | ringtone midi | free cellphone ringtones

  28. 65.110.43.* 于 2007-04-03 14:15:20发表:

    Good design!
    alltel ringtones | download free mp3 ringtones | star wars ringtone | motorola keypress ringtones | cellphone ringtones | free mp3 ringtones download | free christian ringtones | free ringtones for alltel | nokia ringtone | ringtone downloads

  29. 72.232.250.* 于 2007-04-03 14:14:58发表:

    Nice site!
    ringtones for cingular | country music ringtones | ctu ringtone | free wwe ringtones | real ringtones | centennial wireless | tmobile ringtones | cricket free ringtones | ringtones samsung | ctu 24 ringtone

  30. 72.232.250.* 于 2007-04-03 14:14:33发表:

    Great work!
    free ringtones for motorola | free sprint ringtones | free midi ringtone | anime ringtones | ringtones for suncom | free monophonic ringtones | downloadable ringtones | cell phone ringtones | ringtones for nokia | ringtones for motorola

  31. 65.110.43.* 于 2007-04-02 18:44:39发表:

    Thank you!
    play slots for free | free slim slots | online free poker | online gambling | slots of fun | free online poker | free games online | online free roulette | free slot machine games | online holdem

  32. 72.232.250.* 于 2007-04-02 18:44:14发表:

    Nice site!
    internet blackjack | free slots games | texas holdem free | no download casino | slots download | free black jack games | online poker games | flash casino | omaha poker | black jack game

  33. 72.232.250.* 于 2007-04-02 18:43:35发表:

    Nice site!
    live poker | internet casino | download party poker | video poker machines | video slot machines | free casino slots | 3 card poker | black jack download | play free roulette | video slot

  34. 65.110.43.* 于 2007-04-02 18:43:17发表:

    Thank you!
    play slots for free | free slim slots | online free poker | online gambling | slots of fun | free online poker | free games online | online free roulette | free slot machine games | online holdem

  35. 65.110.43.* 于 2007-04-02 18:41:33发表:

    Nice site!
    download casino | video poker | russian roulette games | online games | black jack free | world series poker | online free blackjack | free poker sites | no deposit casino bonuses | computer poker

  36. 65.110.43.* 于 2007-04-02 18:41:14发表:

    Great work!
    pokerstars download | world poker | free slot machines | casino slots | poker game free | aussie slots | free poker downloads | casino on net | black jack strip | slot machine

  37. 65.110.43.* 于 2007-04-01 16:28:41发表:

    Good design!
    casino games free | planet poker | blackjack free | play texas hold em | free games on line | poker online | free slots games | free strip blackjack | free casino games | free online casino slots

  38. 72.232.250.* 于 2007-04-01 16:27:46发表:

    Great work!
    online poker sites | black jack online | blackjack strip | poker game free | online slot games | free on line poker | free black jack | free slot machine games | free poker websites | free video

  39. 65.110.43.* 于 2007-04-01 16:27:27发表:

    Well done!
    free three card poker | poker games download | free online bingo games | free sims slots | new no deposit casino | play casino games | no download free slots | play free blackjack | strip blackjack games | caribbean stud poker

  40. 72.232.250.* 于 2007-04-01 16:26:55发表:

    Good design!
    free multi line slots | online slot machines | absolute poker | games download | online texas holdem | casino poker | free no deposit casino | free online texas holdem | stud poker | world series of poker download

  1. 首页上一页 51 52 53 54 55 下一页 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