Java图片处理 (文字水印、图片水印、缩放、补白)代码实例

Java图片处理 (文字水印、图片水印、缩放、补白)代码实例

package com.hmw.picMark;

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.geom.AffineTransform;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

/**

* 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_FORMSAIsEYATE_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 + http://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);

}

}

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