[Java] java实现给图片加铺满的网格式文字水印

package com.example.demo;
 
import java.awt.alphacomposite;
import java.awt.color;
import java.awt.font;
import java.awt.graphics2d;
import java.awt.image;
import java.awt.renderinghints;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
import java.io.inputstream;
import java.io.outputstream;
 
import javax.imageio.imageio;
 
/**
 * @author xuyangwei
 * @date 2021/1/28 09:10
 */
public class watermarkutils {
 // 水印透明度
 private static float alpha = 0.5f;
 // 水印文字大小
 public static final int font_size = 18;
 // 水印文字字体
 private static font font = new font("宋体", font.plain, font_size);
 // 水印文字颜色
 private static color color = color.gray;
 // 水印之间的间隔
 private static final int xmove = 80;
 // 水印之间的间隔
 private static final int ymove = 80;
 
 /**
  * 给图片添加水印文字
  *
  * @param logotext 水印文字
  * @param srcimgpath 源图片路径
  * @param targerpath 目标图片路径
  */
 public static void imagebytext(string logotext, string srcimgpath, string targerpath) {
  imagebytext(logotext, srcimgpath, targerpath, null);
 }
 
 
 /**
  * 获取文本长度。汉字为1:1，英文和数字为2:1
  */
 private static int gettextlength(string text) {
  int length = text.length();
  for (int i = 0; i < text.length(); i++) {
   string s = string.valueof(text.charat(i));
   if (s.getbytes().length > 1) {
  length++;
   }
  }
  length = length % 2 == 0 ? length / 2 : length / 2 + 1;
  return length;
 }
 
 
 /**
  * 给图片添加水印文字、可设置水印文字的旋转角度
  *
  * @param logotext
  * @param srcimgpath
  * @param targerpath
  * @param degree
  */
 public static void imagebytext(string logotext, string srcimgpath, string targerpath, integer degree) {
 
  inputstream is = null;
  outputstream os = null;
  try {
   // 源图片
   image srcimg = imageio.read(new file(srcimgpath));
   int width = srcimg.getwidth(null);// 原图宽度
   int height = srcimg.getheight(null);// 原图高度
   bufferedimage buffimg = new bufferedimage(srcimg.getwidth(null), srcimg.getheight(null),
   bufferedimage.type_int_rgb);
   // 得到画笔对象
   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);
   // 设置水印旋转
   if (null != degree) {
  g.rotate(math.toradians(degree), (double) buffimg.getwidth() / 2, (double) buffimg.getheight() / 2);
   }
   // 设置水印文字颜色
   g.setcolor(color);
   // 设置水印文字font
   g.setfont(font);
   // 设置水印文字透明度
   g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha));
 
   int x = -width / 2;
   int y = -height / 2;
   int markwidth = font_size * gettextlength(logotext);// 字体长度
   int markheight = font_size;// 字体高度
 
   // 循环添加水印
   while (x < width * 1.5) {
  y = -height / 2;
  while (y < height * 1.5) {
   g.drawstring(logotext, x, y);
 
   y += markheight + ymove;
  }
  x += markwidth + xmove;
   }
   // 释放资源
   g.dispose();
   // 生成图片
   os = new fileoutputstream(targerpath);
   imageio.write(buffimg, "jpg", os);
   system.out.println("添加水印文字成功!");
  } catch (exception e) {
   e.printstacktrace();
  } finally {
   try {
  if (null != is)
   is.close();
   } catch (exception e) {
  e.printstacktrace();
   }
   try {
  if (null != os)
   os.close();
   } catch (exception e) {
  e.printstacktrace();
   }
  }
 }
 
 public static void main(string[] args) {
  string srcimgpath = "d:/1.jpg";
  // 水印文字
  string logotext = "打印无效";
  string targertextpath2 = "d:/2.jpg";
  system.out.println("给图片添加水印文字开始...");
  // 给图片添加斜水印文字
  watermarkutils.imagebytext(logotext, srcimgpath, targertextpath2, -40);
  system.out.println("给图片添加水印文字结束...");
 }
}