FileUtil.java

package com.clo.sdk.android.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;


public class FileUtil {


    public static String getExtension(File f) {
        return (f != null) ? getExtension(f.getName()) : "";
    }

    public static String getExtension(String filename) {
        return getExtension(filename, "");
    }

    public static String getExtension(String filename, String defExt) {
        if ((filename != null) && (filename.length() > 0)) {
            int i = filename.lastIndexOf('.');

            if ((i >-1) && (i < (filename.length() - 1))) {
                return filename.substring(i + 1);
            }
        }
        return defExt;
    }

    public static String trimExtension(String filename) {
        if ((filename != null) && (filename.length() > 0)) {
            int i = filename.lastIndexOf('.');
            if ((i >-1) && (i < (filename.length()))) {
                return filename.substring(0, i);
            }
        }
        return filename;
    }

	public static byte[] readFileImage(String filename) throws IOException {
		BufferedInputStream bufferedInputStream = new BufferedInputStream(
				new FileInputStream(filename));
		int len = bufferedInputStream.available();
		byte[] bytes = new byte[len];
		int r = bufferedInputStream.read(bytes);
		if (len != r) {
			bytes = null;
			throw new IOException("读取文件不正确");
		}
		bufferedInputStream.close();
		return bytes;
	}



}