自己动手精简jre
/** * 清理jre路径中不需要的文件<br> * <b>@author </b>Peacenik 2013-12-28<br> * @param jrePath jre路径 */public static void cleanJre(String jrePath) throws IOException{Files.walkFileTree(Paths.get(jrePath), new JreFileVisitor());deleteEmptyFolder(jrePath);}
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/** * jre文件访问器<br> * <b>项目名称 </b>test7<br> * <b>@author </b>Peacenik 2013-12-28<br> */private static final class JreFileVisitor extends SimpleFileVisitor<Path>{/** * 计数器 */private int i = 0;/* * <b>重写方法</b><br> * @see java.nio.file.SimpleFileVisitor#visitFile(java.lang.Object, java.nio.file.attribute.BasicFileAttributes) */@Overridepublic FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException{FileVisitResult result = super.visitFile(file, attrs);tryDelete(file);return result;}/** * 更具程序执行结果判断该文件是否可删除<br> * 如果可删除，则 删除文件并返回true<br> * 如果不能删除，则返回false * <b>@author </b>Peacenik 2013-12-28<br> * @param file 文件 * @return boolean * @throws IOException */private boolean tryDelete(Path file) throws IOException{String path = file.toFile().getPath();Path targetPath = Paths.get(path.replaceFirst("jre", "jre_back"));// 移除文件if (!Files.exists(targetPath.getParent())){Files.createDirectories(targetPath.getParent());}if (Files.exists(targetPath)){Files.delete(targetPath);}Files.move(file, targetPath);boolean success = executeSuccess();if (!executeSuccess()){// 执行失败时恢复移除的文件Files.move(targetPath, file);}System.out.println((++this.i) + "\t/\t" + success + "\t/\t" + file.toFile().getPath());return success;}}?
/** * 删除空目录<br> * <b>@author </b>Peacenik 2013-12-28<br> * @param folder 文件夹路径 */private static void deleteEmptyFolder(String folder) throws IOException{Files.walkFileTree(Paths.get(folder), new SimpleFileVisitor<Path>(){@Overridepublic FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException{FileVisitResult result = super.postVisitDirectory(dir, exc);if (dir.toFile().list().length == 0){Files.delete(dir);}return result;}});}?
/** * 执行程序，返回程序是否执行成功<br> * 这个方法需要根据自己的情况进行修改 * <b>@author </b>Peacenik 2013-12-28<br> * @return boolean */public static boolean executeSuccess(){Process process = null;try{// 创建执行程序String[] commands = new String[] { "D:/tools/exe4j/demo/mytools/test7.exe" };File directory = new File("D:/tools/exe4j/demo/mytools/");process = Runtime.getRuntime().exec(commands, new String[] {}, directory);process.waitFor();byte[] bs = new byte[10];// 读取错误信息try (InputStream ins = process.getErrorStream()){int length = ins.read(bs);if (length > 0){return false;}}// 读取非错误信息try (InputStream ins = process.getInputStream()){int length = process.getInputStream().read(bs);if (length != 2){return false;}}// 判断返回值int ret = process.exitValue();process.destroy();return (ret == 0) && "ok".equals(new String(bs, 0, 2));}catch (Exception e){return false;}finally{if (process != null){process.destroy();}}}?
补充：
rt.jar 这个jar文件有几十兆，可以视情况删除其中的部分package，也可以瘦身不少
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