java生成缩略图 +图片水印+文字水印

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; /**

* @author Eric Xu * */

public final class ImageUtils { /**

* 图片水印

* @param pressImg 水印图片 * @param targetImg 目标图片 * @param x 修正值 默认在中间 * @param y 修正值 默认在中间 * @param alpha 透明度 */

public final static void pressImage(String pressImg, String targetImg, int x, int y, float alpha) {

try {

File img = new File(targetImg); Image src = ImageIO.read(img); int wideth = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); //水印文件

Image src_biao = ImageIO.read(new File(pressImg)); int wideth_biao = src_biao.getWidth(null); int height_biao = src_biao.getHeight(null);

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,

alpha));

g.drawImage(src_biao, (wideth - wideth_biao) , (height - height_biao), wideth_biao, height_biao, null);

//水印文件结束 g.dispose();

ImageIO.write((BufferedImage) image, \"jpg\ } catch (Exception e) { e.printStackTrace(); } }

/**

* 文字水印

* @param pressText 水印文字 * @param targetImg 目标图片 * @param fontName 字体名称 * @param fontStyle 字体样式 * @param color 字体颜色 * @param fontSize 字体大小 * @param x 修正值 * @param y 修正值 * @param alpha 透明度 */

public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) { try {

File img = new File(targetImg); Image src = ImageIO.read(img); int width = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, width, height, null); g.setColor(color);

g.setFont(new Font(fontName, fontStyle, fontSize));

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));

g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);

g.dispose();

ImageIO.write((BufferedImage) image, \"jpg\ } catch (Exception e) { e.printStackTrace();

} }

/**

* 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 = 0.0; //缩放比例 File f = new File(filePath);

BufferedImage bi = ImageIO.read(f);

Image itemp = bi.getScaledInstance(width, height, bi.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\ } catch (IOException e) {

e.printStackTrace(); } }

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

pressImage(\"f:\\\\imgtest\\\\sy.gif\

//pressText(\"我是文字水印\黑体\0.3f);

//resize(\"G:\\\\imgtest\\\est1.jpg\ }

public static int getLength(String text) { int length = 0;

for (int i = 0; i < text.length(); i++) {

if (new String(text.charAt(i) + \"\").getBytes().length > 1) { length += 2; } else {

length += 1; } }

return length / 2; } }