java得到图片的高度和宽度 java 获取图片格式

话不多说上源码

public String getPicType(String srcPath) {
        //读取文件的前几个字节 文件头 来判断图片格式
        byte[] b = new byte[4];
        StringBuilder sb = new StringBuilder();

        FileInputStream fis = null;

        try {
            fis = new FileInputStream(srcPath);
            fis.read(b, 0, b.length);
        } catch (IOException e) {
            e.printStackTrace();
        }
        for (int i = 0; i < b.length; i++) {
            sb.append(String.format("%02x", b[i]));
        }


        try {
            String type = sb.toString().toUpperCase();
            if (type.contains("FFD8FF")) {
                return "jpg";

            } else if (type.contains("89504E47")) {
                return "png";
            } else if (type.contains("47494638")) {
                return "gif";
            } else if (type.contains("424D")) {
                return "bmp";
            } else if (type.contains("52494646")) {
                return "webp";
            } else if (type.contains("49492A00")) {
                return "tif";
            } else {
                return null;
            }
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }