java根据url获取网页缩略图

发布网友发布时间：2022-04-27 10:45

共4个回答

热心网友时间：2022-04-27 12:15

代码如下:

public static Bitmap
loadImageFromUrl(String url, int sc) {
        URL m;
        InputStream
i = null;
        BufferedInputStream bis = null;
        ByteArrayOutputStream out = null;
        byte isBuffer[] = new
byte[1024];
        if (url == null)
            return null;
        try {
            m = new URL(url);
            i = (InputStream)
m.getContent();

            bis = new BufferedInputStream(i, 1024 * 4);
            out =
new ByteArrayOutputStream();
            int len = 0;
            while
((len = bis.read(isBuffer)) != -1) {
                out.write(isBuffer, 0,
len);
            }
            out.close();
            bis.close();
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
            return null;
        } catch
(IOException e) {
            e.printStackTrace();
        }
        if
(out == null)
            return null;
        byte[] data =
out.toByteArray();
        BitmapFactory.Options options = new
BitmapFactory.Options();
        options.inJustDecodeBounds =
true;
        BitmapFactory.decodeByteArray(data, 0, data.length,
options);
        options.inJustDecodeBounds = false;
        int be =
(int) (options.outHeight / (float) sc);
        if (be <= 0)
{
            be = 1;
        } else if (be > 3) {
            be =
3;
        }
        options.inSampleSize = be;
        Bitmap bmp =
null;
        try {
            bmp = BitmapFactory.decodeByteArray(data,
0, data.length, options); // 返回缩略图
        } catch (OutOfMemoryError e)
{
            // TODO: handle exception
            System.gc();
            bmp = null;
        }
        return
bmp;
    }

热心网友时间：2022-04-27 13:33

Bitmap是Android的类，可以通过读写流转为BufferedImage

热心网友时间：2022-04-27 15:07

那是安卓的bitmap追问java 没有bitmap类？

追答java只有Image和BufferedImage你把bitmap改成BufferedImage,自己再做压缩，就可以获取略缩图了啊

热心网友时间：2022-04-27 16:59

找缩略图？我只知道在URL在WEB里找根路径