标签：null eth graph out scale str decode output 输出
/**
* 图片缩放
*/
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();
} // 读入文件
int widthYuan = src.getWidth(); // 得到源图宽
int heightYuan = src.getHeight(); // 得到源图长
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); // 绘制缩小后的图
g.dispose();
return tag;// 输出到文件流
}
/**
* byte流转为字符串
*/
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;
}
/**
* 将图片字符串流转为图片二进制
*/
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;
}
/**
* 将图片直接转为byte
*/
public static byte[] byteByImage(BufferedImage image) {
ByteArrayOutputStream bos = new ByteArrayOutputStream(); // 将图片转为byte
try {
ImageIO.write(image, "jpg", bos);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bos.toByteArray();
}
base64转byte[]、byte[]转base64、byte[]转图片后图片按固定宽高缩放
标签：null eth graph out scale str decode output 输出
原文地址：https://www.cnblogs.com/han-java/p/10502448.html
