Java代码实现给图片添加文字水印 详细教程一

项目需求:编辑进行编辑的文章，添加水印的效果

程序代码

package image;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;/** * @author 无名 * @Date 2017/12/29 * @use 利用Java代码给图片加水印 */public class WaterMarkUtils {
<span class="hljs-javadoc">/** *<span class="hljs-javadoctag"> @param</span> srcImgPath 源图片路径 *<span class="hljs-javadoctag"> @param</span> tarImgPath 保存的图片路径 *<span class="hljs-javadoctag"> @param</span> waterMarkContent 水印内容 *<span class="hljs-javadoctag"> @param</span> markContentColor 水印颜色 *<span class="hljs-javadoctag"> @param</span> font 水印字体 */</span><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">addWaterMark</span>(String srcImgPath, String tarImgPath, String waterMarkContent,Color markContentColor,Font font) {    <span class="hljs-keyword">try</span> {        <span class="hljs-comment">// 读取原图片信息</span>        File srcImgFile = <span class="hljs-keyword">new</span> File(srcImgPath);<span class="hljs-comment">//得到文件</span>        Image srcImg = ImageIO.read(srcImgFile);<span class="hljs-comment">//文件转化为图片</span>        <span class="hljs-keyword">int</span> srcImgWidth = srcImg.getWidth(<span class="hljs-keyword">null</span>);<span class="hljs-comment">//获取图片的宽</span>        <span class="hljs-keyword">int</span> srcImgHeight = srcImg.getHeight(<span class="hljs-keyword">null</span>);<span class="hljs-comment">//获取图片的高</span>        <span class="hljs-comment">// 加水印</span>        BufferedImage bufImg = <span class="hljs-keyword">new</span> BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);        Graphics2D g = bufImg.createGraphics();        g.drawImage(srcImg, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, srcImgWidth, srcImgHeight, <span class="hljs-keyword">null</span>);        g.setColor(markContentColor); <span class="hljs-comment">//根据图片的背景设置水印颜色</span>        g.setFont(font);              <span class="hljs-comment">//设置字体</span>        <span class="hljs-comment">//设置水印的坐标</span>        <span class="hljs-keyword">int</span> x = srcImgWidth - <span class="hljs-number">2</span>*getWatermarkLength(waterMarkContent, g);          <span class="hljs-keyword">int</span> y = srcImgHeight - <span class="hljs-number">2</span>*getWatermarkLength(waterMarkContent, g);          g.drawString(waterMarkContent, x, y);  <span class="hljs-comment">//画出水印</span>        g.dispose();          <span class="hljs-comment">// 输出图片  </span>        FileOutputStream outImgStream = <span class="hljs-keyword">new</span> FileOutputStream(tarImgPath);          ImageIO.write(bufImg, <span class="hljs-string">"jpg"</span>, outImgStream);        System.out.println(<span class="hljs-string">"添加水印完成"</span>);          outImgStream.flush();          outImgStream.close();      } <span class="hljs-keyword">catch</span> (Exception e) {        <span class="hljs-comment">// TODO: handle exception</span>    }}<span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">getWatermarkLength</span>(String waterMarkContent, Graphics2D g) {      <span class="hljs-keyword">return</span> g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), <span class="hljs-number">0</span>, waterMarkContent.length());  }  <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span>(String[] args) {    Font font = <span class="hljs-keyword">new</span> Font(<span class="hljs-string">"微软雅黑"</span>, Font.PLAIN, <span class="hljs-number">35</span>);                     <span class="hljs-comment">//水印字体</span>    String srcImgPath=<span class="hljs-string">"H:/安静时写写/写写博客/Java实现给图片添加水印/s.jpg"</span>; <span class="hljs-comment">//源图片地址</span>    String tarImgPath=<span class="hljs-string">"H:/安静时写写/写写博客/Java实现给图片添加水印/t.jpg"</span>; <span class="hljs-comment">//待存储的地址</span>    String waterMarkContent=<span class="hljs-string">"图片来源：http://blog.csdn.net/zjq_1314520"</span>;  <span class="hljs-comment">//水印内容</span>    Color color=<span class="hljs-keyword">new</span> Color(<span class="hljs-number">255</span>,<span class="hljs-number">255</span>,<span class="hljs-number">255</span>,<span class="hljs-number">128</span>);                               <span class="hljs-comment">//水印图片色彩以及透明度</span>    <span class="hljs-keyword">new</span> WaterMarkUtils().addWaterMark(srcImgPath, tarImgPath, color, waterMarkContent,font);}
}
最后效果

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