我确实找到了我的问题的答案：Barts 的答案正是我需要的原因，但它不起作用（见下文）。
请有人可以给我一个工作示例或告诉我实施 Barts答案的问题所在吗？
这是我得到的另一个答案，我从“第 4 部分”中得到以下错误
Lexer lexer = (Lexer)Class.forName(grammarName + "Lexer").newInstance();
我有完整的 antlr3.4 和 JDK 库。我创建了它，package createclass;但我发现答案很奇怪，因为要创建的类没有包？？？所以我尝试添加到字符串：
"@lexer::header {\n" +
" package createclass;\n" +
"} \n" +
"@parser::header {\n" +
" package createclass;\n" +
"}\n" +
但仍然没有任何变化。
这是输出：
debug:
Exception in thread "main" java.lang.ClassNotFoundException: TLexer
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at createclass.Createclass.main(Createclass.java:61)
Java Result: 1
BUILD SUCCESSFUL (total time: 31 seconds)
给出的示例代码是：
import java.io.*;
import javax.tools.*;
import java.lang.reflect.*;
import org.antlr.runtime.*;
import org.antlr.Tool;
public class Main {
public static void main(String[] args) throws Exception {
// The grammar which echos the parsed characters to theconsole,
// skipping any white space chars.
final String grammar =
"grammar T; \n" +
" \n" +
"parse \n" +
" : (ANY {System.out.println(\"ANY=\" + $ANY.text);})* EOF \n" +
" ; \n" +
" \n" +
"SPACE \n" +
" : (' ' | '\\t' | '\\r' | '\\n') {skip();} \n" +
" ; \n" +
" \n" +
"ANY \n" +
" : . \n" +
" ; ";
final String grammarName = "T";
final String entryPoint = "parse";
// 1 - Write the `.g` grammar file to disk.
Writer out = new BufferedWriter(new FileWriter(new File(grammarName + ".g")));
out.write(grammar);
out.close();
// 2 - Generate the lexer and parser.
Tool tool = new Tool(new String[]{grammarName + ".g"});
tool.process();
// 3 - Compile the lexer and parser.
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
compiler.run(null, System.out, System.err, "-sourcepath", "", grammarName + "Lexer.java");
compiler.run(null, System.out, System.err, "-sourcepath", "", grammarName + "Parser.java");
// 4 - Parse the command line parameter using the dynamically created lexer and
// parser with a bit of reflection Voodoo :)
Lexer lexer = (Lexer)Class.forName(grammarName + "Lexer").newInstance();
lexer.setCharStream(new ANTLRStringStream(args[0]));
CommonTokenStream tokens = new CommonTokenStream(lexer);
Class<?> parserClass = Class.forName(grammarName + "Parser");
Constructor parserCTor = parserClass.getConstructor(TokenStream.class);
Parser parser = (Parser)parserCTor.newInstance(tokens);
Method entryPointMethod = parserClass.getMethod(entryPoint);
entryPointMethod.invoke(parser);
}
}