以像素爲單位調整字節數組圖像的大小

Question

我將圖像存儲爲字節數組。無論尺寸有多大，我都希望將其縮小至100x100像素。

我想將字節數組轉換爲bufferedimage，調整大小並將其保存爲bytearray。但通過以下代碼，圖片不再出現在我的頁面上。

byte[] pict; // this array contains the image 
BufferedImage bufferedImage; 

ByteArrayInputStream bais = new ByteArrayInputStream(pict); 
try { 
    bufferedImage = ImageIO.read(bais); 
    bufferedImage = Scalr.resize(bufferedImage, 100); 

    ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
    ImageIO.write(bufferedImage, "jpg", baos); 
    baos.flush(); 

    pict = baos.toByteArray(); 
    baos.close(); 

} catch (IOException e) { 
    throw new RuntimeException(e); 
} 
OutputStream o = response.getOutputStream(); 
o.write(pict); 

Answer 1

做它，而不是這樣：

Image tmpImage = ImageIO.read(bais); 
Image scaled = tmpImage.getScaledInstance(100, 100, Image.SCALE_SMOOTH); 

然後，轉換爲字節數組，將圖像轉換成一個BufferedImage，然後是入字節數組：

BufferedImage buffered = ((ToolkitImage) scaled).getBufferedImage(); 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
ImageIO.write(buffered, "jpg", baos); 
baos.flush(); 
pict = baos.toByteArray(); 
baos.close();