詞法分析器JFLEX

一、homepage and download

home page:http://jflex.de/docu.html

download:http://jflex.de/download.html

使用手冊：http://jflex.de/manual.html

二、解壓和配置環境變量

解壓以後，編輯文件bin\jflex.bat，在其中設置java_home和jflex_home環境變量，JAVA_HOME默認爲C:\JAVA，JFLEX_HOME默認爲C:\JFLEX。

JAVA_HOME contains the directory where your Java JDK is installed (for instance C:\java) and

JFLEX_HOME the directory that contains JFlex (in the example: C:\JFlex)

三、生成詞法解析文件

運行命令：jflex lexer.flex，則產生JFlexLexer.java的詞法解析文件

D:\jflex1.4.3\example>jflex lexer.flex
Reading "lexer.flex"
Constructing NFA : 955 states in NFA
Converting NFA to DFA :
............................................................................
............................................................................
............................................................................
.............................................................
447 states before minimization, 350 states in minimized DFA
Writing code to "JFlexLexer.java"