common_helper/src/main/java/com/xiongyingqi/util/FileType.java
public static String getFileType(File file){
        String res = null;
        try{
            @SuppressWarnings("resource")
            FileInputStream fis = new FileInputStream(file);
            byte[] b = new byte[10];
            fis.read(b, 0, b.length);
            String fileCode = bytesToHexString(b);

            Iterator<String> keyIter = FILE_TYPE_MAP.keySet().iterator();
            while(keyIter.hasNext()){
                String key = keyIter.next();
                if(key.toLowerCase().startsWith(fileCode.toLowerCase()) || fileCode.toLowerCase().startsWith(key.toLowerCase())){
                    res = FILE_TYPE_MAP.get(key);
                    break;
                }
            }
        }catch(FileNotFoundException e){
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
        return res;
    }
public static String getFileType(File file){
        String res = null;
        try{
            @SuppressWarnings("resource")
            FileInputStream fis = new FileInputStream(file);
            byte[] b = new byte[10];
            fis.read(b, 0, b.length);
            String fileCode = bytesToHexString(b);

            Iterator<String> keyIter = FILE_TYPE_MAP.keySet().iterator();
            while(keyIter.hasNext()){
                String key = keyIter.next();
                if(key.toLowerCase().startsWith(fileCode.toLowerCase()) || fileCode.toLowerCase().startsWith(key.toLowerCase())){
                    res = FILE_TYPE_MAP.get(key);
                    break;
                }
            }
        }catch(FileNotFoundException e){
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
        return res;
    }
获取文件类型
@param file
@return