java的小知识

import com.sun.javadoc.ClassDoc;
import com.sun.javadoc.FieldDoc;
import com.sun.javadoc.MethodDoc;
import com.sun.javadoc.RootDoc;
import com.sun.javadoc.ExecutableMemberDoc;
import com.sun.javadoc.ParamTag;
import com.sun.tools.javadoc.Main;

public class ParseClass {
	
	private static RootDoc rootDoc;

	
	public static boolean start(RootDoc root) {
		rootDoc = root;
		return true;
	}

	public static void main(String[] args) {

		String beanFilePath = "E:\workspaces\stud\demo\src\main\java\com\example\demo\form\HelloForm.java";

		Main.execute(new String[] { "-doclet", ParseClass.class.getName(), "-docletpath",
				ParseClass.class.getResource("/").getPath(), "-encoding", "utf-8", "-classpath", "E:\workspaces\stud\demo\target\classes;", beanFilePath });
		ClassDoc[] classes = rootDoc.classes();
        if (classes == null || classes.length == 0) {
            return;
        }
        for (ClassDoc classDoc : classes) {
        	System.out.println(Arrays.asList(classDoc.commentText()));

            FieldDoc[] fields = classDoc.fields(false);
            for (FieldDoc field : fields) {
                System.out.println(Arrays.asList(field.name(), field.type().typeName(), field.commentText()));
            }
            MethodDoc[] methods = classDoc.methods(false);
            for (MethodDoc method : methods) {
            	System.out.println(Arrays.asList(method.name(), method.returnType().typeName(), method.commentText()));
            }
            printMembers(classDoc.constructors());
            printMembers(classDoc.methods());

        }

	}
	
	   static void printMembers(ExecutableMemberDoc[] mems) {
	        for (int i = 0; i < mems.length; ++i) {
	            ParamTag[] params = mems[i].paramTags();
	            System.out.println(mems[i].qualifiedName());
	            for (int j = 0; j < params.length; ++j) {
	                System.out.println("   " + params[j].parameterName()
	                    + " - " + params[j].parameterComment());
	            }
	        }
	    }

}

在写这段代码前，必须把%JAVA_HOME%/lib/tools.jar 放到classpath