JAVA编程：Stream Tokenizing（分化字符串）

多谢指点，其实我对.net和ruby也不是很了解，对与java也只是刚起步的阶段，只是在学习中有了点想法就写出来了，现在俺本科还没毕业，所以对大型项目基本上也没有什么经验。stream|字符串从sun网站看到的StreamTokenizing
InTechTips:June23,1998,anexampleofstringtokenizationwaspresented,usingtheclassjava.util.StringTokenizer.

Theresalsoanotherwaytodotokenization,usingjava.io.StreamTokenizer.StreamTokenizeroperatesoninputstreamsratherthanstrings,andeachbyteintheinputstreamisregardedasacharacterintherangeu0000throughu00FF.

StreamTokenizerislowerlevelthanStringTokenizer,butoffersmorecontroloverthetokenizationprocess.Theclassusesaninternaltabletocontrolhowtokensareparsed,andthissyntaxtablecanbemodifiedtochangetheparsingrules.HeresanexampleofhowStreamTokenizerworks:


importjava.io.*;
importjava.util.*;

publicclassstreamtoken{
publicstaticvoidmain(Stringargs[])
{
if(args.length==0){
System.err.println("missinginputfilename");
System.exit(1);
}

Hashtablewordlist=newHashtable();

try{
FileReaderfr=newFileReader(args[0]);
BufferedReaderbr=newBufferedReader(fr);

StreamTokenizerst=newStreamTokenizer(br);
//StreamTokenizerst=
//newStreamTokenizer(newStringReader(
//"thisisatest"));
st.resetSyntax();
st.wordChars(A,Z);
st.wordChars(a,z);
inttype;
Objectdummy=newObject();
while((type=st.nextToken())!=
StreamTokenizer.TT_EOF){
if(type==StreamTokenizer.TT_WORD)
wordlist.put(st.sval,dummy);
}
br.close();
}
catch(IOExceptione){
System.err.println(e);
}

Enumerationenum=wordlist.keys();
while(enum.hasMoreElements())
System.out.println(enum.nextElement());
}
}

Inthisexample,aStreamTokenizeriscreatedontopofaFileReader/BufferedReaderpairthatrepresentsatextfile.NotethataStreamTokenizercanalsobemadetoreadfromaStringbyusingStringReaderasillustratedinthecommented-outcodeshownabove(StringBufferInputStreamalsoworks,althoughthisclasshasbeendeprecated).

ThemethodresetSyntaxisusedtocleartheinternalsyntaxtable,sothatStreamTokenizerforgetsanyrulesthatitknowsaboutparsingtokens.ThenwordCharsisusedtodeclarethatonlyupperandlowercaselettersshouldbeconsideredtoformwords.Thatis,theonlytokensthatStreamTokenizerrecognizesaresequencesofupperandlowercaseletters.

nextTokeniscalledrepeatedlytoretrievewords,andeachresultingwordisfoundinthepublicinstancevariable"st.sval".ThewordsareinsertedintoaHashtable,andattheendofprocessingthecontentsofthetablearedisplayed,usinganEnumerationasillustratedinTechTips:June23,1998.Sotheactionofthisprogramistofindalltheuniquewordsinatextfileanddisplaythem.

StreamTokenizeralsohasspecialfacilitiesforparsingnumbers,quotedstrings,andcomments.ItsausefulalternativetoStringTokenizer,andisespeciallyapplicableifyouaretokenizinginputstreams,orwishtoexercisefinercontroloverthetokenizationprocess


用java开发web只要两本书：一本是关于java基础的，一本是关于jsp、servlet的就可以了。开发周期长，我就来讲句题外话，现在有很多思想都是通过java来展现。

吧，现在很流行的Structs就是它的一种实现方式，不过Structs用起来实在是很繁，我们只要学习其精髓即可，我们完全可以设计自己的MVC结构。然后你再研究一下软件Refactoring (重构)和极限XP编程，相信你又会上一个台阶。 做完这些，你不如整理一下你的Java代码，把那些经典的程序和常见的应用整理出来，再精心打造一番，提高其重用性和可扩展性。你再找几个志同道合的朋友成立一个工作室吧