水印位置自己调

//注意x,y的设置就好

public class WaterMarkUtils {

   /**
    * @param file 源图片路径
    * @param date 图片生成日期
    * @param address 图片生成地址
    */
   public static byte[] addWaterMark(InputStream file,String date,String address,String imageName) {
      byte[] buff = null;
      //字体大小
      int size = 30;
      Font fonts = null;
      try {
         // 读取原图片信息
         BufferedImage bufImg = ImageIO.read(file);
         // 获取图片的宽
         int srcImgWidth = bufImg.getWidth(null);
         // 获取图片的高
         int srcImgHeight = bufImg.getHeight(null);
         //计算字体大小
         size = (srcImgWidth-1080)/40 +size;
         fonts = new Font("微软雅黑", Font.PLAIN, size);

         // 加水印
         Graphics2D g = bufImg.createGraphics();
         // 设置水印的坐标
         //设置水印的坐标
         int x = 0;
         int y = srcImgHeight-150;
         // 去除锯齿(当设置的字体过大的时候,会出现锯齿)
         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
         g.setColor(new Color(0, 0, 0, 40));
         //画矩形不带框的
         g.fillRect(x, y, 4000, 120);
         g.setColor(new Color(255, 255, 255, 153));
         // 设置字体
         g.setFont(fonts);
         if(StringUtils.isNotBlank(date)){
            // 画出水印
            g.drawString(date, x+30, y+50);
         }
         if(StringUtils.isNotBlank(address)){
            // 画出水印
            g.drawString(address, x+30, y+100);
         }
         // 输出图片
//       FileOutputStream outImgStream = new FileOutputStream("D:/"+file.getOriginalFilename());
//       ImageIO.write(bufImg, "jpg", outImgStream);
//       outImgStream.flush();
//       outImgStream.close();

         String prefix = imageName.substring(imageName.lastIndexOf(".")+1);
         ByteArrayOutputStream os = new ByteArrayOutputStream();
         ImageIO.write(bufImg, prefix, os);
         buff = os.toByteArray();
      } catch (Exception e) {
         e.printStackTrace();
      }
      return buff;
   }
   /**
    * @param file 源图片路径
    * @param date 图片生成日期
    * @param address 图片生成地址
    */
   public static byte[] addWaterMark(File file, String date, String address, String imageName) {
      byte[] buff = null;
      //字体大小
      int size = 30;
      //俩条水印的距离
      int line = 45;
      //底色的宽度
      int width = 1000;
      Font fonts = null;
      try {
         // 读取原图片信息
         BufferedImage bufImg = ImageIO.read(file);
         // 获取图片的宽
         int srcImgWidth = bufImg.getWidth(null);
         // 获取图片的高
         int srcImgHeight = bufImg.getHeight(null);
         //计算字体大小
         size = (srcImgWidth-1080)/40 +size;
         fonts = new Font("微软雅黑", Font.PLAIN, size);
         // 加水印
         Graphics2D g = bufImg.createGraphics();
         // 设置水印的坐标
         //设置水印的坐标
         int x = 0;
         int y = srcImgHeight-150;
         // 去除锯齿(当设置的字体过大的时候,会出现锯齿)
         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
         g.setColor(new Color(0, 0, 0, 40));
         //画矩形不带框的
         g.fillRect(x, y, 4000, 120);
         g.setColor(new Color(255, 255, 255, 153));
         // 设置字体
         g.setFont(fonts);
         if(StringUtils.isNotBlank(date)){
            // 画出水印
            g.drawString(date, x+30, y+50);
         }
         if(StringUtils.isNotBlank(address)){
            // 画出水印
            g.drawString(address, x+30, y+100);
         }
         // 输出图片
         FileOutputStream outImgStream = new FileOutputStream("/Users/zhangsl/Desktop/b.png");
         ImageIO.write(bufImg, "png", outImgStream);
         outImgStream.flush();
         outImgStream.close();

         String prefix = imageName.substring(imageName.lastIndexOf(".")+1);
         ByteArrayOutputStream os = new ByteArrayOutputStream();
         ImageIO.write(bufImg, prefix, os);
         buff = os.toByteArray();
      } catch (Exception e) {
         e.printStackTrace();
      }
      return buff;
   }

   public static int getWatermarkLength(String waterMarkContent, Graphics2D g) {
      return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
   }

   public static void main(String arg[]){
      File file = new File("/Users/zhangsl/Desktop/a.png");

      WaterMarkUtils.addWaterMark(file, "20180626","zhangs","werer");
   }
   
   
}