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1 package com.hmw.picMark; 2 3 import java.awt.AlphaComposite; 4 import java.awt.Color; 5 import java.awt.Font; 6 import java.awt.Graphics2D; 7 import java.awt.Image; 8 import java.awt.geom.AffineTransform; 9 import java.awt.image.AffineTransformOp; 10 import java.awt.image.BufferedImage; 11 import java.io.File; 12 import java.io.IOException; 13 14 import javax.imageio.ImageIO; 15 16 /** 17 * 图片工具类， 图片水印，文字水印，缩放，补白等 18 * @author Carl He 19 */ 20 public final class ImageUtils { 21 /**图片格式：JPG*/ 22 private static final String PICTRUE_FORMATE_JPG = "jpg"; 23 24 private ImageUtils(){} 25 /** 26 * 添加图片水印 27 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg 28 * @param waterImg 水印图片路径，如：C://myPictrue//logo.png 29 * @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 30 * @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 31 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) 32 */ 33 public final static void pressImage(String targetImg, String waterImg, int x, int y, float alpha) { 34 try { 35 File file = new File(targetImg); 36 Image image = ImageIO.read(file); 37 int width = image.getWidth(null); 38 int height = image.getHeight(null); 39 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 40 Graphics2D g = bufferedImage.createGraphics(); 41 g.drawImage(image, 0, 0, width, height, null); 42 43 Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件 44 int width_1 = waterImage.getWidth(null); 45 int height_1 = waterImage.getHeight(null); 46 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); 47 48 int widthDiff = width - width_1; 49 int heightDiff = height - height_1; 50 if(x < 0){ 51 x = widthDiff / 2; 52 }else if(x > widthDiff){ 53 x = widthDiff; 54 } 55 if(y < 0){ 56 y = heightDiff / 2; 57 }else if(y > heightDiff){ 58 y = heightDiff; 59 } 60 g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件结束 61 g.dispose(); 62 ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); 63 } catch (IOException e) { 64 e.printStackTrace(); 65 } 66 } 67 68 /** 69 * 添加文字水印 70 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg 71 * @param pressText 水印文字， 如：中国证券网 72 * @param fontName 字体名称， 如：宋体 73 * @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC) 74 * @param fontSize 字体大小，单位为像素 75 * @param color 字体颜色 76 * @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 77 * @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 78 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) 79 */ 80 public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) { 81 try { 82 File file = new File(targetImg); 83 84 Image image = ImageIO.read(file); 85 int width = image.getWidth(null); 86 int height = image.getHeight(null); 87 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 88 Graphics2D g = bufferedImage.createGraphics(); 89 g.drawImage(image, 0, 0, width, height, null); 90 g.setFont(new Font(fontName, fontStyle, fontSize)); 91 g.setColor(color); 92 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); 93 94 int width_1 = fontSize * getLength(pressText); 95 int height_1 = fontSize; 96 int widthDiff = width - width_1; 97 int heightDiff = height - height_1; 98 if(x < 0){ 99 x = widthDiff / 2; 100 }else if(x > widthDiff){ 101 x = widthDiff; 102 } 103 if(y < 0){ 104 y = heightDiff / 2; 105 }else if(y > heightDiff){ 106 y = heightDiff; 107 } 108 109 g.drawString(pressText, x, y + height_1); 110 g.dispose(); 111 ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); 112 } catch (Exception e) { 113 e.printStackTrace(); 114 } 115 } 116 117 /** 118 * 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 119 * @param text 120 * @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4. 121 */ 122 public static int getLength(String text) { 123 int textLength = text.length(); 124 int length = textLength; 125 for (int i = 0; i < textLength; i++) { 126 if (String.valueOf(text.charAt(i)).getBytes().length > 1) { 127 length++; 128 } 129 } 130 return (length % 2 == 0) ? length / 2 : length / 2 + 1; 131 } 132 133 /** 134 * 图片缩放 135 * @param filePath 图片路径 136 * @param height 高度 137 * @param width 宽度 138 * @param bb 比例不对时是否需要补白 139 */ 140 public static void resize(String filePath, int height, int width, boolean bb) { 141 try { 142 double ratio = 0; //缩放比例 143 File f = new File(filePath); 144 BufferedImage bi = ImageIO.read(f); 145 Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); 146 //计算比例 147 if ((bi.getHeight() > height) || (bi.getWidth() > width)) { 148 if (bi.getHeight() > bi.getWidth()) { 149 ratio = (new Integer(height)).doubleValue() / bi.getHeight(); 150 } else { 151 ratio = (new Integer(width)).doubleValue() / bi.getWidth(); 152 } 153 AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null); 154 itemp = op.filter(bi, null); 155 } 156 if (bb) { 157 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 158 Graphics2D g = image.createGraphics(); 159 g.setColor(Color.white); 160 g.fillRect(0, 0, width, height); 161 if (width == itemp.getWidth(null)) 162 g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); 163 else 164 g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); 165 g.dispose(); 166 itemp = image; 167 } 168 ImageIO.write((BufferedImage) itemp, "jpg", f); 169 } catch (IOException e) { 170 e.printStackTrace(); 171 } 172 } 173 174 public static void main(String[] args) throws IOException { 175 pressImage("C://pic//jpg", "C://pic//test.gif", 5000, 5000, 0f); 176 pressText("C://pic//jpg", "旺仔之印", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f); 177 resize("C://pic//4.jpg", 1000, 500, true); 178 } 179 }
getLength 这个方法用来得到文字的长度 全角一个字 半角算半个字 但是感觉这种方法不太好 不知道有没有更好地方法~
功能描述：使用Jquery 给页面的图片添加 版权信息水印。
这里的水印并不是真的把每一张图片上都添加了水印。而是在图片的上方添加了一个层，层中包含了水印图片效果就像是图片上加了水印。
功能原理：1，使用jquery 遍历页面的所有img标签，取得其位置信息
2，在body里边追加一个div，div中放水印图片，根据1中取得的位置，来确定水印div的相对位置。
代码：
1 $(function(){ 2 3 4 $("img").each(function(){ 5 // 特殊情况--过滤掉无关的图片 6 if($(this).attr("id") == "img1"){ 7 return; 8 } 9 10 11 var top = $(this).offset().top+10;//这里数字根据需要调，一般配在数据库中 12 var left = $(this).offset().left+10; 13 var styleString="width:250px;height:50px;display:block;position:absolute;left:"+left+"px;top:"+top+"px;"; 14 var imageUrl="images/shuiyin.jpg"; 15 //追加水印div 16 $(document.body).append(‘<div id="shuiyinDiv" style=‘+styleString+‘><img src=‘+imageUrl+‘></div>‘); 17 });
3、JS加水印遮罩
1 <%@ page language="java" pageEncoding="utf-8"%> 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 3 <html> 4 <head> 5 <title>悬浮水印</title> 6 <meta http-equiv="pragma" content="no-cache"> 7 <meta http-equiv="cache-control" content="no-cache"> 8 <meta http-equiv="expires" content="0"> 9 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 10 <meta http-equiv="description" content="This is my page"> 11 <script type="text/javascript" src="watermark.js"></script> 12 </head> 13 <body onload="GetWaterMarked(window,‘watermark.jpg‘,‘this‘)"> 14 <div><font size="7"> 15 This is a test.<br> 16 This is a test.<br> 17 This is a test.<br> 18 This is a test.<br> 19 This is a test.<br> 20 This is a test.<br> 21 This is a test.<br> 22 This is a test.<br> 23 This is a test.<br> 24 This is a test.<br> 25 This is a test.<br> 26 This is a test.<br> 27 This is a test.<br> 28 This is a test.<br> 29 This is a test.<br> 30 This is a test.<br> 31 This is a test.<br> 32 This is a test.<br> 33 This is a test.<br> 34 This is a test.<br> 35 This is a test.<br> 36 This is a test.<br> 37 </font></div> 38 </body> 39 </html>
1 function GetWaterMarked(targetObj,jpgUrl,targetStr ) { 2 var windowobj=targetObj; 3 var waterMarkPicUrl=jpgUrl; 4 var controlWindowStr=targetStr; 5 if(windowobj.document.getElementById("waterMark") != null) 6 return; 7 var m = "waterMark"; 8 var newMark = windowobj.document.createElement("div"); 9 newMark.id = m; 10 11 //定义div绝对位置 12 newMark.style.position = "absolute"; 13 newMark.style.top = "0px"; 14 newMark.style.left = "0px"; 15 //设置div堆叠顺序，若为正数，则离用户更近，为负，数则表示离用户更远 16 newMark.style.zIndex = "99999"; 17 //使用浏览器宽 18 newMark.style.width = windowobj.document.body.clientWidth; 19 //页面实际长度(不显示竖向滚动条)>浏览器长 20 if( parseInt(windowobj.document.body.scrollHeight) > parseInt(windowobj.document.body.clientHeight) ){ 21 newMark.style.height = windowobj.document.body.scrollHeight; 22 }else{ 23 newMark.style.height = windowobj.document.body.clientHeight; 24 } 25 //使用水印图片设为div背景 26 newMark.style.backgroundImage = "url("+ waterMarkPicUrl +")"; 27 //透明样式 28 newMark.style.filter = "alpha(opacity=20)"; 29 //加入div 30 windowobj.document.body.appendChild(newMark); 31 32 var markStr = "var sobj ="+controlWindowStr+".document.getElementById(‘waterMark‘);sobj.style.width ="+controlWindowStr+".document.body.clientWidth;sobj.style.height ="+controlWindowStr+".document.body.clientHeight;"; 33 if(windowobj.document.body.onresize != null){ 34 var oldResiae = windowobj.document.body.onresize.toString(); 35 var oldResiaeStr = oldResiae.substr(oldResiae.indexOf("{")+1); 36 var oldResiaeStr= oldResiaeStr.substr(0,oldResiaeStr.lastIndexOf("}")); 37 oldResiaeStr+=";"+markStr; 38 windowobj.document.body.onresize = new Function(oldResiaeStr); 39 }else{ 40 windowobj.document.body.onresize = new Function(markStr); 41 } 42 }
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原文地址：http://www.cnblogs.com/douglas0126x/p/5000612.html
