java图片转byte转string

第一种：原始乱码：

public static void main(String[] args) throws IOException {
            File imgFile = new File("d:\\1.jpg");
            FileInputStream fis = new FileInputStream( imgFile );
            byte[] bytes = new byte[fis.available()];
            fis.read(bytes);
            fis.close();
            String imgStr = new String(bytes);
            System.out.println( imgStr);
    }

第二种：完整字节：

public String byteToString(byte[] buf){
        String str1="";
        StringBuilder sb=new StringBuilder(str1);
        for (byte element: buf )
        {
        sb.append(element);
        }
        str1=sb.toString();
        return str1;
    }
    public static void main(String[] args) throws IOException {
            File imgFile = new File("d:\\1.jpg");
            FileInputStream fis = new FileInputStream( imgFile );
            byte[] bytes = new byte[fis.available()];
            fis.read(bytes);
            fis.close();
            String imgStr = new Byte().byteToString(bytes);
            System.out.println( imgStr);
    }