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Java File 文件操作

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取得文件夹大小 long 单位为M ```java public static long getFileSize(File f) throws Exception {
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;
}

转换文件大小```java
public static String FormetFileSize(long fileS) {  
        DecimalFormat df = new DecimalFormat("#.00");  
        String fileSizeString = "";  
        if (fileS == 0) {  
            fileSizeString = "0KB";  
        } else if (fileS < 1024) {  
            fileSizeString = df.format((double) fileS) + "B";  
        } else if (fileS < 1048576) {  
            fileSizeString = df.format((double) fileS / 1024) + "KB";  
        } else if (fileS < 1073741824) {  
            fileSizeString = df.format((double) fileS / 1048576) + "MB";  
        } else {  
            fileSizeString = df.format((double) fileS / 1073741824) + "G";  
        }  
        return fileSizeString;  
    }  

删除指定目录下文件及目录```java public static void deleteFolderFile(String filePath, boolean deleteThisPath)
throws IOException {
if (!TextUtils.isEmpty(filePath)) {
File file = new File(filePath);
if (file.isDirectory()) {// 处理目录
File files[] = file.listFiles();
for (int i = 0; i < files.length; i++) {
deleteFolderFile(files[i].getAbsolutePath(), true);
}
}
if (deleteThisPath) {
// 如果是文件,删除
if (!file.isDirectory()) {
file.delete();
} else {
// 目录下没有文件或者目录,删除
if (file.listFiles().length == 0) {
file.delete();
}
}
}
}
}

```java
    /** 
     * 获取文件名 
     *  
     * @param path 
     * @return 
     */  
    public static String getFileName(String path) {  
        int start = path.lastIndexOf("/") + 1;  
        return path.substring(start);  
    }  

    /** 
     * 获取文件名 
     *  
     * @param file 
     * @return 
     */  
    public static String getFileName(File file) {  
        String filePath = file.getAbsolutePath();  
        return getFileName(filePath);  
    }  

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