import java.io.File; import java.text.DecimalFormat;import java.io.FileInputStream;public class GetFileSize{public long getFileSizes(File f) throws Exception{//取得文件大小long s=0;if (f.exists()) {FileInputStream fis = null;fis = new FileInputStream(f);s= fis.available();} else {f.createNewFile();System.out.println("文件不存在");}return s;}// 递归public long getFileSize(File f)throws Exception//取得文件夹大小{long size = 0;File flist[] = f.listFiles();for (int i = 0; i < flist.length; i++){if (flist[i].isDirectory()){size = size + getFileSize(flist[i]);} else{size = size + flist[i].length();}}return size;}public String FormetFileSize(long fileS) {//转换文件大小DecimalFormat df = new DecimalFormat("#.00");String fileSizeString = "";if (fileS < 1024) {fileSizeString = df.format((double) fileS) + "B";} else if (fileS < 1048576) {fileSizeString = df.format((double) fileS / 1024) + "K";} else if (fileS < 1073741824) {fileSizeString = df.format((double) fileS / 1048576) + "M";} else {fileSizeString = df.format((double) fileS / 1073741824) + "G";}return fileSizeString;}public long getlist(File f){//递归求取目录文件个数long size = 0;File flist[] = f.listFiles();size=flist.length;for (int i = 0; i < flist.length; i++) {if (flist[i].isDirectory()) {size = size + getlist(flist[i]);size--;}}return size;}public static void main(String args[]){GetFileSize g = new GetFileSize();long startTime = System.currentTimeMillis();try{long l = 0;String path = "C:\\WINDOWS";File ff = new File(path);if (ff.isDirectory()) { //如果路径是文件夹的时候System.out.println("文件个数" + g.getlist(ff));System.out.println("目录");l = g.getFileSize(ff);System.out.println(path + "目录的大小为：" + g.FormetFileSize(l));} else {System.out.println("文件个数1");System.out.println("文件");l = g.getFileSizes(ff);System.out.println(path + "文件的大小为：" + g.FormetFileSize(l));}} catch (Exception e){e.printStackTrace();}long endTime = System.currentTimeMillis();System.out.println("总共花费时间为：" + (endTime - startTime) + "毫秒...");}}

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