windows下自动生成文件夹下所有JNI所需的.h文件_JAVA_编程开发_程序员俱乐部

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class GenerateHFile {
	static String suffix = ".class";
	static String outputFolder = ".\\h\\";//输出文件夹

	/**生成以classRoot为根文件夹的类的JNI用的.h文件,其中folder为当前路径，他应为classRoot的一个子路径
	 * @param folder 当前文件夹
	 * @param classRoot 类文件的根路径
	 */
	static void generateHFile(File folder, File classRoot) {
		File fs[] = folder.listFiles();
		for (File file : fs) {
			if (file.isDirectory()) {
				generateHFile(file, classRoot);
			} else if (file.getName().endsWith(suffix)) {
				String exe = "javah";
				String arg = classRoot.getAbsolutePath();
				String tmp = file.getAbsolutePath();
				tmp = tmp.substring(arg.length() + 1,
						tmp.length() - suffix.length());
				tmp = tmp.replace(File.separator.charAt(0), '.');
				String cmds[] = { exe, "-d", outputFolder,"-classpath",arg, tmp };
				try {
					Process p = Runtime.getRuntime().exec(cmds);
					p.waitFor();
				} catch (IOException e) {
					e.printStackTrace();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}

				System.out.println(arg);
			}
		}
	}

	static String prefix = "JNIEXPORT";

	/**
	 * 清除不包含native方法的h文件，根据文件中是否含有"JNIEXPORT"来进行判断
	 */
	static void clean() {
		File[] fs = new File(outputFolder).listFiles();
		Label: for (int i = 0; i < fs.length; i++) {

			try {
				BufferedReader br = new BufferedReader(new FileReader(fs[i]));

				while (br.ready()) {
					String s = br.readLine();
					if (s.startsWith(prefix)) {
						continue Label;
					}
				}
				br.close();
				System.out.print("has deleted successfully: " + fs[i]);
				boolean b = fs[i].delete();
				System.out.println(" : " + b);

			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public static void main(String[] args) {
		File dir = new File(".");
		new File(outputFolder).mkdirs();
		generateHFile(dir, dir);
		clean();

	}
}