base64轉byte[]、byte[]轉base64、byte[]轉圖片後圖片按固定寬高縮放
/**
* 圖片縮放
*/
public static BufferedImage ImageStringByte(int width, byte[] b) {
InputStream buffin = new ByteArrayInputStream(b);
BufferedImage src = null;
try {
src = ImageIO.read(buffin);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} // 讀入檔案
int widthYuan = src.getWidth(); // 得到源圖寬
int heightYuan = src.getHeight(); // 得到源圖長
heightYuan = heightYuan / (widthYuan/width);
widthYuan = width ;
Image image = src.getScaledInstance(widthYuan, heightYuan, Image.SCALE_DEFAULT);
BufferedImage tag = new BufferedImage(widthYuan, heightYuan, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
boolean drawImage = g.drawImage(image, 0, 0, null); // 繪製縮小後的圖
g.dispose();
return tag;// 輸出到檔案流
}
/**
* byte流轉為字串
*/
public static String stringsByImage(byte[] binaryData) {
String b = null;
try {
// b = decoder.decodeBuffer(base64str);
b = Base64.encode(binaryData);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return b;
}
/**
* 將圖片字串流轉為圖片二進位制
*/
public static byte[] ImageByString(String base64str) {
byte[] b = null;
try {
b = Base64.decode(base64str);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return b;
}
/**
* 將圖片直接轉為byte
*/
public static byte[] byteByImage(BufferedImage image) {
ByteArrayOutputStream bos = new ByteArrayOutputStream(); // 將圖片轉為byte
try {
ImageIO.write(image, "jpg", bos);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bos.toByteArray();
}