java图片添加水印实例代码分享

本文为大家介绍了java图片添加水印实例代码，java实现水印还是非常方便的，水印可以是图片或者文字，具体内容如下

package michael.io.image; 
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.fileinputstream; 
import java.io.fileoutputstream; 
import java.io.inputstream; 
import java.io.outputstream; 
 
import javax.imageio.imageio; 
import javax.swing.imageicon; 
 
import com.sun.image.codec.jpeg.jpegcodec; 
import com.sun.image.codec.jpeg.jpegimagedecoder; 
import com.sun.image.codec.jpeg.jpegimageencoder; 
 
/** 
 * 图片水印 
 * @blog http://sjsky.iteye.com 
 * @author michael 
 */ 
public class imagemarklogobyicon { 
 
 /** 
  * @param args 
  */ 
 public static void main(string[] args) { 
  string srcimgpath = "d:/test/michael/myblog_01.png"; 
  string iconpath = "d:/test/michael/blog_logo.png"; 
  string targerpath = "d:/test/michael/img_mark_icon.jpg"; 
  string targerpath2 = "d:/test/michael/img_mark_icon_rotate.jpg"; 
  // 给图片添加水印 
  imagemarklogobyicon.markimagebyicon(iconpath, srcimgpath, targerpath); 
  // 给图片添加水印,水印旋转-45 
  imagemarklogobyicon.markimagebyicon(iconpath, srcimgpath, targerpath2, 
    -45); 
 
 } 
 
 /** 
  * 给图片添加水印 
  * @param iconpath 水印图片路径 
  * @param srcimgpath 源图片路径 
  * @param targerpath 目标图片路径 
  */ 
 public static void markimagebyicon(string iconpath, string srcimgpath, 
   string targerpath) { 
  markimagebyicon(iconpath, srcimgpath, targerpath, null); 
 } 
 
 /** 
  * 给图片添加水印、可设置水印图片旋转角度 
  * @param iconpath 水印图片路径 
  * @param srcimgpath 源图片路径 
  * @param targerpath 目标图片路径 
  * @param degree 水印图片旋转角度 
  */ 
 public static void markimagebyicon(string iconpath, string srcimgpath, 
   string targerpath, integer degree) { 
  outputstream os = null; 
  try { 
   image srcimg = imageio.read(new file(srcimgpath)); 
 
   bufferedimage buffimg = new bufferedimage(srcimg.getwidth(null), 
     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(srcimg.getscaledinstance(srcimg.getwidth(null), 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.src_atop, 
     alpha)); 
 
   // 表示水印图片的位置 
   g.drawimage(img, 150, 300, null); 
 
   g.setcomposite(alphacomposite.getinstance(alphacomposite.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(); 
   } 
  } 
 } 
} 

再为大家分享一例：

import java.awt.color;
import java.awt.font;
import java.awt.graphics;
import java.awt.image;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
import javax.imageio.imageio;
import com.sun.image.codec.jpeg.jpegcodec;
import com.sun.image.codec.jpeg.jpegimageencoder;
 
public final class imageutils {
 public imageutils() {
 
 }
 
 /**
  * public final static string getpressimgpath() { return applicationcontext
  * .getrealpath("/template/data/util/shuiyin.gif"); }
  */
 
 /**
  * 把图片印刷到图片上
  * 
  * @param pressimg --
  *   水印文件
  * @param targetimg --
  *   目标文件
  * @param x
  *   --x坐标
  * @param y
  *   --y坐标
  */
 public final static void pressimage(string pressimg, string targetimg,
   int x, int y) {
  try {
   //目标文件
   file _file = new file(targetimg);
   image src = imageio.read(_file);
   int wideth = src.getwidth(null);
   int height = src.getheight(null);
   bufferedimage image = new bufferedimage(wideth, height,
     bufferedimage.type_int_rgb);
   graphics g = image.creategraphics();
   g.drawimage(src, 0, 0, wideth, height, null);
 
   //水印文件
   file _filebiao = new file(pressimg);
   image src_biao = imageio.read(_filebiao);
   int wideth_biao = src_biao.getwidth(null);
   int height_biao = src_biao.getheight(null);
   g.drawimage(src_biao, (wideth - wideth_biao) / 2,
     (height - height_biao) / 2, wideth_biao, height_biao, null);
   //水印文件结束
   g.dispose();
   fileoutputstream out = new fileoutputstream(targetimg);
   jpegimageencoder encoder = jpegcodec.createjpegencoder(out);
   encoder.encode(image);
   out.close();
  } catch (exception e) {
   e.printstacktrace();
  }
 }
 
 /**
  * 打印文字水印图片
  * 
  * @param presstext
  *   --文字
  * @param targetimg --
  *   目标图片
  * @param fontname --
  *   字体名
  * @param fontstyle --
  *   字体样式
  * @param color --
  *   字体颜色
  * @param fontsize --
  *   字体大小
  * @param x --
  *   偏移量
  * @param y
  */
 
 public static void presstext(string presstext, string targetimg,
   string fontname, int fontstyle, int color, int fontsize, int x,
   int y) {
  try {
   file _file = new file(targetimg);
   image src = imageio.read(_file);
   int wideth = src.getwidth(null);
   int height = src.getheight(null);
   bufferedimage image = new bufferedimage(wideth, height,
     bufferedimage.type_int_rgb);
   graphics g = image.creategraphics();
   g.drawimage(src, 0, 0, wideth, height, null);
    
   g.setcolor(color.red);
   g.setfont(new font(fontname, fontstyle, fontsize));
 
   g.drawstring(presstext, wideth - fontsize - x, height - fontsize
     / 2 - y);
   g.dispose();
   fileoutputstream out = new fileoutputstream(targetimg);
   jpegimageencoder encoder = jpegcodec.createjpegencoder(out);
   encoder.encode(image);
   out.close();
  } catch (exception e) {
   system.out.println(e);
  }
 }
 
 public static void main(string[] args) {
  pressimage("f:/logo.png",   "f:/123.jpg", 0, 0);
 }
}

希望本文所述对大家用java语言实现图片添加水印有所帮助。