Java生成水印图片实例

可根据自己需求调整水印样式、、、

public class ImageUtil {private static final int INITTOP = 100;private static final int FONDCOLOR = 9999990;private static final String FOND = "微软雅黑";/*** 创建水印图片* @param width* @param height*/public static void createImg(String realname, String policeNo,String idCard, String ip, String sessionId) {int width = 446;   //图片宽度int height = 350;  //图片高度createImg(width, height, realname, policeNo, idCard, ip, sessionId);}/*** 绘制姓名* @param realname*/private static int grapRealname(Graphics g, String realname) {if (realname == null || "".equals(realname)) {return 0;}int top = INITTOP;int left = 80;g.setColor(new Color(FONDCOLOR));g.setFont(new Font(FOND, Font.PLAIN, 20));if (realname.length() == 2) {for (int i = 0; i < realname.length(); i++) {String str = realname.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}left = left + 20 * realname.length();} else if (realname.length() == 3) {for (int i = 0; i < realname.length(); i++) {String str = realname.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}left = left + 20 * realname.length();} else if (realname.length() == 4) {g.setFont(new Font(FOND, Font.PLAIN, 20));for (int i = 0; i < realname.length(); i++) {String str = realname.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}left = left + 20 * realname.length();}return left;}/*** 绘制编号* @param g* @param policeNo*/private static void grapPoliceNo(Graphics g, String policeNo, int toLeft) {if (policeNo == null || "".equals(policeNo)) {return;}int top = INITTOP;int left = 10;g.setColor(new Color(FONDCOLOR));g.setFont(new Font(FOND, Font.PLAIN, 20));// top=top+60;left += toLeft;for (int i = 0; i < policeNo.length(); i++) {String str = policeNo.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}}/*** 绘制身份证* @param g* @param policeNo*/private static void grapIdCard(Graphics g, String idCard) {int top = INITTOP;int left = 15;g.setColor(new Color(FONDCOLOR));g.setFont(new Font(FOND, Font.PLAIN, 20));top = top + 40;for (int i = 0; i < idCard.length(); i++) {String str = idCard.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}}/*** 绘制IP* @param g* @param policeNo*/private static void grapIp(Graphics g, String ip) {int top = INITTOP;int left = 25;g.setColor(new Color(FONDCOLOR));g.setFont(new Font(FOND, Font.PLAIN, 20));top = top + 80;for (int i = 0; i < ip.length(); i++) {String str = ip.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}}/*** 绘制日期* @param g* @param policeNo*/private static void grapDate(Graphics g, String newDate) {int top = INITTOP;int left = 25;g.setColor(new Color(FONDCOLOR));g.setFont(new Font(FOND, Font.PLAIN, 20));top = top + 120;for (int i = 0; i < newDate.length(); i++) {String str = newDate.substring(i, i + 1);g.drawString(str, left + 20 * i, top);}}/*** 创建水印图片* @param width* @param height*/public static void createImg(int width, int height,String realname,String policeNo,String idCard) {width=340;height=300;//首先判断水印图片是否存在SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");String newDate=sdf.format(new Date());//System.out.println("newDate："+newDate);String newDateStr=newDate.replaceAll("-", "");//System.out.println("newDateStr："+newDateStr);File file=new File("项目目录"+"/image/shuiyin/"+idCard+"_"+policeNo+"_"+newDateStr+".png");if(file.exists()){return;}BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_ARGB);// 获取图形上下文Graphics g = image.getGraphics();// 设定背景色
//      g.setColor(new Color(0xffffff));
//      g.fillRect(0, 0, width, height);// 画边框
//      g.setColor(Color.black);
//      g.drawRect(0, 0, width - 1, height - 1);
//      //写入姓名int toLeft=grapRealname(g, realname);//写入警号grapPoliceNo(g, policeNo,toLeft);//写入日期grapDate(g, newDate);// 释放图形上下文g.dispose();//旋转图片BufferedImage img = new BufferedImage(width, height,BufferedImage.TYPE_INT_ARGB);Graphics g2 = img.getGraphics();// 设定背景色// g2.setColor(new Color(0xffffff));// g2.fillRect(0, 0, width, height);Graphics2D graphics2d;(graphics2d = img.createGraphics()).setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);graphics2d.rotate(Math.toRadians(-45), width / 2, height / 2);   //逆时针旋转45度  graphics2d.drawImage(image, 0, 0, null);        graphics2d.dispose();try {// 输出图像到页面ImageIO.write(img, "png",file);} catch (IOException e) {e.printStackTrace();}//System.out.println("ok");}/*** 创建水印图片* * @param width* @param height*/public static void createImg(int width, int height, String realname,String policeNo, String idCard, String ip, String sessionId) {System.out.println(sessionId);width = 440;height = 350;// 首先判断水印图片是否存在SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");String newDate = sdf.format(new Date());File file = new File(Sungoal.getInstance().getSungoalHome()+"/images/shuiyin/"+sessionId + ".jpeg");if (file.exists()) {return;}BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);// 获取图形上下文Graphics g = image.getGraphics();// 设定背景色g.setColor(new Color(0xffffff));g.fillRect(0, 0, width, height);// //写入姓名int toLeft = grapRealname(g, realname);// 写入编号grapPoliceNo(g, policeNo, toLeft);// 写入身份证号grapIdCard(g, idCard);// 写入IPgrapIp(g, ip);// 写入日期grapDate(g, newDate);// 释放图形上下文g.dispose();// 旋转图片BufferedImage img = new BufferedImage(width, height, image.getColorModel().getTransparency());Graphics g2 = img.getGraphics();// 设定背景色g2.setColor(new Color(0xffffff));g2.fillRect(0, 0, width, height);Graphics2D graphics2d;(graphics2d = img.createGraphics()).setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);graphics2d.rotate(Math.toRadians(-45), width / 2, height / 2); // 逆时针旋转45度graphics2d.drawImage(image, 0, 0, null);graphics2d.dispose();try {// 输出图像到页面ImageIO.write(img, "JPEG", file);} catch (IOException e) {e.printStackTrace();}}
}

如图水印效果…

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