/**
* 图片工具类， 图片水印，文字水印，缩放，补白等
* @author Carl He
*/
public
final
class
ImageUtils {
/**图片格式：JPG*/
private
static
final String PICTRUE_FORMATE_JPG =
"jpg"
;
private
ImageUtils(){}
/**
* 添加图片水印
* @param targetImg 目标图片路径，如：C://myPictrue//1.jpg
* @param waterImg 水印图片路径，如：C://myPictrue//logo.png
* @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public
final
static
void
pressImage(String targetImg, String waterImg,
int
x,
int
y,
float
alpha) {
try
{
File file =
new
File(targetImg);
Image image = ImageIO.read(file);
int
width = image.getWidth(
null
);
int
height = image.getHeight(
null
);
BufferedImage bufferedImage =
new
BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height,
null
);
Image waterImage = ImageIO.read(
new
File(waterImg));
// 水印文件
int
width_1 = waterImage.getWidth(
null
);
int
height_1 = waterImage.getHeight(
null
);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int
widthDiff = width - width_1;
int
heightDiff = height - height_1;
if
(x < 0){
x = widthDiff / 2;
}
else
if
(x > widthDiff){
x = widthDiff;
}
if
(y < 0){
y = heightDiff / 2;
}
else
if
(y > heightDiff){
y = heightDiff;
}
g.drawImage(waterImage, x, y, width_1, height_1,
null
);
// 水印文件结束
g.dispose();
ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);
}
catch
(IOException e) {
e.printStackTrace();
}
}
/**
* 添加文字水印
* @param targetImg 目标图片路径，如：C://myPictrue//1.jpg
* @param pressText 水印文字， 如：中国证券网
* @param fontName 字体名称， 如：宋体
* @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC)
* @param fontSize 字体大小，单位为像素
* @param color 字体颜色
* @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public
static
void
pressText(String targetImg, String pressText, String fontName,
int
fontStyle,
int
fontSize, Color color,
int
x,
int
y,
float
alpha) {
try
{
File file =
new
File(targetImg);
Image image = ImageIO.read(file);
int
width = image.getWidth(
null
);
int
height = image.getHeight(
null
);
BufferedImage bufferedImage =
new
BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height,
null
);
g.setFont(
new
Font(fontName, fontStyle, fontSize));
g.setColor(color);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int
width_1 = fontSize * getLength(pressText);
int
height_1 = fontSize;
int
widthDiff = width - width_1;
int
heightDiff = height - height_1;
if
(x < 0){
x = widthDiff / 2;
}
else
if
(x > widthDiff){
x = widthDiff;
}
if
(y < 0){
y = heightDiff / 2;
}
else
if
(y > heightDiff){
y = heightDiff;
}
g.drawString(pressText, x, y + height_1);
g.dispose();
ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);
}
catch
(Exception e) {
e.printStackTrace();
}
}
/**
* 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符
* @param text
* @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4.
*/
public
static
int
getLength(String text) {
int
textLength = text.length();
int
length = textLength;
for
(
int
i = 0; i < textLength; i++) {
if
(String.valueOf(text.charAt(i)).getBytes().length > 1) {
length++;
}
}
return
(length % 2 == 0) ? length / 2 : length / 2 + 1;
}
/**
* 图片缩放
* @param filePath 图片路径
* @param height 高度
* @param width 宽度
* @param bb 比例不对时是否需要补白
*/
public
static
void
resize(String filePath,
int
height,
int
width, boolean bb) {
try
{
double
ratio = 0;
//缩放比例
File f =
new
File(filePath);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
//计算比例
if
((bi.getHeight() > height) || (bi.getWidth() > width)) {
if
(bi.getHeight() > bi.getWidth()) {
ratio = (
new
Integer(height)).doubleValue() / bi.getHeight();
}
else
{
ratio = (
new
Integer(width)).doubleValue() / bi.getWidth();
}
AffineTransformOp op =
new
AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio),
null
);
itemp = op.filter(bi,
null
);
}
if
(bb) {
BufferedImage image =
new
BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
if
(width == itemp.getWidth(
null
))
g.drawImage(itemp, 0, (height - itemp.getHeight(
null
)) / 2, itemp.getWidth(
null
), itemp.getHeight(
null
), Color.white,
null
);
else
g.drawImage(itemp, (width - itemp.getWidth(
null
)) / 2, 0, itemp.getWidth(
null
), itemp.getHeight(
null
), Color.white,
null
);
g.dispose();
itemp = image;
}
ImageIO.write((BufferedImage) itemp,
"jpg"
, f);
}
catch
(IOException e) {
e.printStackTrace();
}
}
public
static
void
main(String[] args) throws IOException {
pressImage(
"C://pic//jpg"
,
"C://pic//test.gif"
, 5000, 5000, 0f);
pressText(
"C://pic//jpg"
,
"旺仔之印"
,
"宋体"
, Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f);
resize(
"C://pic//4.jpg"
, 1000, 500,
true
);
}
}