java怎么实现添加图片水印和文字水印
这篇文章主要介绍java怎么实现添加图片水印和文字水印,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
我们经常会在一些图片或者图片上看到某某公司或品牌的水印,那么我们可不可以自己在喜欢的图片或文件上添加水印呢?答案当然是没问题。
我们先来看看图片水印:
----------------------------图片水印----------------------------
添加文字水印
import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import javax.imageio.ImageIO;public class WaterMarkUtils { public static void main(String[] args) { // 原图位置, 输出图片位置, 水印文字颜色, 水印文字 new WaterMarkUtils().mark("C:/Users/liqiang/Desktop/图片/kdmt.jpg", "C:/Users/liqiang/Desktop/图片/kdmt1.jpg", Color.red, "圖片來源:XXX"); } public void mark(String class="lazy" data-srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent) { try { // 读取原图片信息 File class="lazy" data-srcImgFile = new File(class="lazy" data-srcImgPath); Image class="lazy" data-srcImg = ImageIO.read(class="lazy" data-srcImgFile); int class="lazy" data-srcImgWidth = class="lazy" data-srcImg.getWidth(null); int class="lazy" data-srcImgHeight = class="lazy" data-srcImg.getHeight(null); // 加水印 BufferedImage bufImg = new BufferedImage(class="lazy" data-srcImgWidth, class="lazy" data-srcImgHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g = bufImg.createGraphics(); g.drawImage(class="lazy" data-srcImg, 0, 0, class="lazy" data-srcImgWidth, class="lazy" data-srcImgHeight, null); // Font font = new Font("Courier New", Font.PLAIN, 12); Font font = new Font("宋体", Font.PLAIN, 20); g.setColor(markContentColor); // 根据图片的背景设置水印颜色 g.setFont(font); int x = class="lazy" data-srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3; int y = class="lazy" data-srcImgHeight - 3; // int x = (class="lazy" data-srcImgWidth - getWatermarkLength(watermarkStr, g)) / 2; // int y = class="lazy" data-srcImgHeight / 2; g.drawString(waterMarkContent, x, y); g.dispose(); // 输出图片 FileOutputStream outImgStream = new FileOutputStream(outImgPath); ImageIO.write(bufImg, "jpg", outImgStream); outImgStream.flush(); outImgStream.close(); } catch (Exception e) { e.printStackTrace(); } } public int getWatermarkLength(String waterMarkContent, Graphics2D g) { return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length()); }}
结果:
给图片添加图片水印
import java.awt.AlphaComposite;import java.awt.Graphics2D;import java.awt.Image;import java.awt.RenderingHints;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;import javax.imageio.ImageIO;import javax.swing.ImageIcon;public class WaterMarkUtils { public static void main(String[] args) { String class="lazy" data-srcImgPath = "C:/Users/liqiang/Desktop/图片/kdmt.jpg"; String iconPath = "C:/Users/liqiang/Desktop/图片/qlq.jpeg"; String targerPath = "C:/Users/liqiang/Desktop/图片/qlq1.jpeg"; String targerPath3 = "C:/Users/liqiang/Desktop/图片/qlq2.jpeg"; // 给图片添加水印 WaterMarkUtils.markImageByIcon(iconPath, class="lazy" data-srcImgPath, targerPath); // 给图片添加水印,水印旋转-45 WaterMarkUtils.markImageByIcon(iconPath, class="lazy" data-srcImgPath, targerPath3, -45); } public static void markImageByIcon(String iconPath, String class="lazy" data-srcImgPath, String targerPath) { markImageByIcon(iconPath, class="lazy" data-srcImgPath, targerPath, null); } public static void markImageByIcon(String iconPath, String class="lazy" data-srcImgPath, String targerPath, Integer degree) { OutputStream os = null; try { Image class="lazy" data-srcImg = ImageIO.read(new File(class="lazy" data-srcImgPath)); BufferedImage buffImg = new BufferedImage(class="lazy" data-srcImg.getWidth(null), class="lazy" data-srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB); // 得到画笔对象 // Graphics g= buffImg.getGraphics(); Graphics2D g = buffImg.createGraphics(); // 设置对线段的锯齿状边缘处理 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g.drawImage(class="lazy" data-srcImg.getScaledInstance(class="lazy" data-srcImg.getWidth(null), class="lazy" data-srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null); if (null != degree) { // 设置水印旋转 g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2); } // 水印图象的路径 水印一般为gif或者png的,这样可设置透明度 ImageIcon imgIcon = new ImageIcon(iconPath); // 得到Image对象。 Image img = imgIcon.getImage(); float alpha = 0.5f; // 透明度 g.setComposite(AlphaComposite.getInstance(AlphaComposite.class="lazy" data-src_ATOP, alpha)); // 表示水印图片的位置 g.drawImage(img, 150, 300, null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.class="lazy" data-src_OVER)); g.dispose(); os = new FileOutputStream(targerPath); // 生成图片 ImageIO.write(buffImg, "JPG", os); System.out.println("图片完成添加Icon印章。。。。。。"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != os) os.close(); } catch (Exception e) { e.printStackTrace(); } } }}
效果展示:
------------------------------PDF水印(itext添加水印)----------------------------
在这里就同时给PDF添加文字水印和图片水印(每一页都添加一个文字水印和图片水印)
依赖的包:
<dependencies> <dependency> <groupId>com.lowagie</groupId> <artifactId>itextasian</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>com.lowagie</groupId> <artifactId>itext</artifactId> <version>2.1.7</version> </dependency> </dependencies>
具体代码:
import java.awt.Color;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Calendar;import com.lowagie.text.DocumentException;import com.lowagie.text.Element;import com.lowagie.text.Image;import com.lowagie.text.pdf.BaseFont;import com.lowagie.text.pdf.PdfContentByte;import com.lowagie.text.pdf.PdfGState;import com.lowagie.text.pdf.PdfReader;import com.lowagie.text.pdf.PdfStamper;public class TestWaterPrint { public static void main(String[] args) throws DocumentException, IOException { // 要输出的pdf文件 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("E:/abc.pdf"))); Calendar cal = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); // 将pdf文件先加水印然后输出 setWatermark(bos, "G:/1.pdf", format.format(cal.getTime()) + " 下载使用人:" + "测试user", 16); } public static void setWatermark(BufferedOutputStream bos, String input, String waterMarkName, int permission) throws DocumentException, IOException { PdfReader reader = new PdfReader(input); PdfStamper stamper = new PdfStamper(reader, bos); int total = reader.getNumberOfPages() + 1; PdfContentByte content; BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED); PdfGState gs = new PdfGState(); for (int i = 1; i < total; i++) { content = stamper.getOverContent(i);// 在内容上方加水印 // content = stamper.getUnderContent(i);//在内容下方加水印 gs.setFillOpacity(0.2f); // content.setGState(gs); content.beginText(); content.setColorFill(Color.LIGHT_GRAY); content.setFontAndSize(base, 50); content.setTextMatrix(70, 200); content.showTextAligned(Element.ALIGN_CENTER, "公司内部文件,请注意保密!", 300, 350, 55); Image image = Image.getInstance("G:/2.jpeg"); image.setAbsolutePosition(200, 206); // set the first background // image of the absolute image.scaleToFit(200, 200); content.addImage(image); content.setColorFill(Color.BLACK); content.setFontAndSize(base, 8); content.showTextAligned(Element.ALIGN_CENTER, "下载时间:" + waterMarkName + "", 300, 10, 0); content.endText(); } stamper.close(); }}
效果展示:
补充:关于字体的用法
使用iTextAsian.jar中的字体
BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
使用Windows系统字体
BaseFont.createFont("C:/WINDOWS/Fonts/SIMYOU.TTF", BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);
使用资源字体(ClassPath) ,也就是将ttf字体拷贝到class="lazy" data-src目录
BaseFont.createFont("/SIMYOU.TTF", BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);
三种方法亲测有效,而且使用itext自带的字体就够用了,可以正确的处理中文。
补充:关于获取PDF页面高度、宽度然后进行动态定位,比如说根据页面宽度实现平铺水印:
package cn.xm.exam.test;import java.awt.FontMetrics;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import javax.swing.JLabel;import com.itextpdf.text.DocumentException;import com.itextpdf.text.Element;import com.itextpdf.text.Rectangle;import com.itextpdf.text.pdf.BaseFont;import com.itextpdf.text.pdf.PdfContentByte;import com.itextpdf.text.pdf.PdfGState;import com.itextpdf.text.pdf.PdfReader;import com.itextpdf.text.pdf.PdfStamper;public class TestWaterPrint { public static void main(String[] args) throws DocumentException, IOException { // 要输出的pdf文件 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("F:/test1.pdf"))); // 将pdf文件先加水印然后输出 setWatermark(bos, "F:/test.pdf", "测试user"); } public static void setWatermark(BufferedOutputStream bos, String input, String waterMarkName) throws DocumentException, IOException { PdfReader reader = new PdfReader(input); PdfStamper stamper = new PdfStamper(reader, bos); // 获取总页数 +1, 下面从1开始遍历 int total = reader.getNumberOfPages() + 1; // 使用classpath下面的字体库 BaseFont base = null; try { base = BaseFont.createFont("/calibri.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); } catch (Exception e) { // 日志处理 e.printStackTrace(); } // 间隔 int interval = -5; // 获取水印文字的高度和宽度 int textH = 0, textW = 0; JLabel label = new JLabel(); label.setText(waterMarkName); FontMetrics metrics = label.getFontMetrics(label.getFont()); textH = metrics.getHeight(); textW = metrics.stringWidth(label.getText()); System.out.println("textH: " + textH); System.out.println("textW: " + textW); // 设置水印透明度 PdfGState gs = new PdfGState(); gs.setFillOpacity(0.4f); gs.setStrokeOpacity(0.4f); Rectangle pageSizeWithRotation = null; PdfContentByte content = null; for (int i = 1; i < total; i++) { // 在内容上方加水印 content = stamper.getOverContent(i); // 在内容下方加水印 // content = stamper.getUnderContent(i); content.saveState(); content.setGState(gs); // 设置字体和字体大小 content.beginText(); content.setFontAndSize(base, 20); // 获取每一页的高度、宽度 pageSizeWithRotation = reader.getPageSizeWithRotation(i); float pageHeight = pageSizeWithRotation.getHeight(); float pageWidth = pageSizeWithRotation.getWidth(); // 根据纸张大小多次添加, 水印文字成30度角倾斜 for (int height = interval + textH; height < pageHeight; height = height + textH * 3) { for (int width = interval + textW; width < pageWidth + textW; width = width + textW * 2) { content.showTextAligned(Element.ALIGN_LEFT, waterMarkName, width - textW, height - textH, 30); } } content.endText(); } // 关流 stamper.close(); reader.close(); }}
结果展示:
补充:关于itext添加倾斜字体的水印
上面使用的是BaseFont,无法添加样式,Font可以添加样式,但是setFontAndSize方法不接受Font参数。所以只能变通实现:
例如:在每页右下角生成倾斜水印
package cn.xm.exam.test;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import com.itextpdf.text.DocumentException;import com.itextpdf.text.Rectangle;import com.itextpdf.text.pdf.BaseFont;import com.itextpdf.text.pdf.PdfContentByte;import com.itextpdf.text.pdf.PdfGState;import com.itextpdf.text.pdf.PdfReader;import com.itextpdf.text.pdf.PdfStamper;public class TestWaterPrint { public static void main(String[] args) throws DocumentException, IOException { // 要输出的pdf文件 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("F:/test2.pdf"))); // 将pdf文件先加水印然后输出 setWatermark(bos, "F:/test.pdf", "测试user123456789"); } public static void setWatermark(BufferedOutputStream bos, String input, String waterMarkName) throws DocumentException, IOException { PdfReader reader = new PdfReader(input); PdfStamper stamper = new PdfStamper(reader, bos); // 获取总页数 +1, 下面从1开始遍历 int total = reader.getNumberOfPages() + 1; // 使用classpath下面的字体库 BaseFont base = null; try { base = BaseFont.createFont("/calibri.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); } catch (Exception e) { // 日志处理 e.printStackTrace(); } // 设置水印透明度 PdfGState gs = new PdfGState(); gs.setFillOpacity(0.4f); gs.setStrokeOpacity(0.4f); PdfContentByte content = null; for (int i = 1; i < total; i++) { // 在内容上方加水印 content = stamper.getOverContent(i); // 在内容下方加水印 // content = stamper.getUnderContent(i); content.saveState(); content.setGState(gs); // 设置字体和字体大小 content.beginText(); content.setFontAndSize(base, 10); // 设置字体样式 float ta = 1F, tb = 0F, tc = 0F, td = 1F, tx = 0F, ty = 0F; // 设置加粗(加粗) ta += 0.25F; td += 0.05F; ty -= 0.2F; // 设置倾斜(倾斜程序自己改) tc += 0.8F; content.setTextMatrix(ta, tb, tc, td, tx, ty); // 设置相对于左下角位置(向右为x,向上为y) content.moveText(300F, 5F); // 显示text content.showText(waterMarkName); content.endText(); content.stroke(); content.restoreState(); } // 关流 stamper.close(); reader.close(); }}
结果展示:
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