JAVA图片水印、压缩

有关图片增加水印图片、水印文字、图片压缩，代码如下：

源码来源于网上，稍作改动。

/**

* 图片工具类，图片水印，文字水印，缩放，补白等

* @author gp

public final class WaterPress {

/** 图片格式：JPG */

private static final String PICTRUE_FORMATE_JPG = "jpg";

private WaterPress() {

}

/**

* 添加图片水印

* @param targetImg

* 目标图片路径，如：d:/1.jpg

* @param waterImg

* 水印图片路径，如：d:/2.png

* @param x

* 水印的横坐标

* @param y

* 水印的纵坐标

* @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();

// 将已经做过水印处理的图片流写到本地

ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, new File("d://3.jpg"));

} 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, new File("d://4.jpg"));

} 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", new File("d://5.jpg"));

} catch (IOException e) {

e.printStackTrace();

}

public static void main(String[] args) throws IOException {

// 打水印图片

pressImage("d://1.jpg", "d://2.png", 400, 1500, 0.5f);

// 打水印文字

pressText("d://1.jpg", "GP之印", "宋体", Font.BOLD | Font.ITALIC, 60,

Color.YELLOW, 400, 100, 1f);

// 图片压缩

resize("d://1.jpg", 1000, 500, true);

}

获取图片流写法：

public static byte[] getPicture(String str) throws Exception {

BufferedImage bu = ImageIO.read(new File(str));

ByteArrayOutputStream imageStream = new ByteArrayOutputStream();

try {

boolean resultWrite = ImageIO.write(bu, "jpg", imageStream);

} catch (Exception e) {

e.printStackTrace();

}

imageStream.flush();

byte[] tagInfo = imageStream.toByteArray();

return tagInfo;

}

发表于 2017-11-24 16:14
阅读 ( 1618 )
分类：Java

JAVA图片水印、压缩

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