java.imageIo给图片添加水印的实现代码
程序员文章站
2023-12-15 17:38:34
复制代码 代码如下:package com.blogs.image;import java.awt.alphacomposite;import java.awt.color...
复制代码 代码如下:
package com.blogs.image;
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;
import javax.swing.imageicon;
/**
* 图片水印
*/
public class imageutil {
/**
* @param args
*/
public static void main(string[] args) {
string srcimgpath = "e:/2.png";
string iconpath = "e:\\logo.jpg";
string targerpath = "e:/3.jpg";
// 给图片添加水印
imageutil.watermarkimagebyicon(iconpath, srcimgpath, targerpath, 0, 0,
, 0.1f);
// 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、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
* @param width
* 宽度(与左相比)
* @param height
* 高度(与顶相比)
* @param clarity
* 透明度(小于1的数)越接近0越透明
*/
public static void watermarkimagebyicon(string iconpath, string srcimgpath,
string targerpath, integer degree, integer width, integer height,
float clarity) {
outputstream os = null;
try {
image srcimg = imageio.read(new file(srcimgpath));
system.out.println("width:" + srcimg.getwidth(null));
system.out.println("height:" + srcimg.getheight(null));
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 = clarity; // 透明度
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop,
alpha));
// 表示水印图片的位置
g.drawimage(img, width, height, 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("添加水印图片完成!");
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (null != os)
os.close();
} catch (exception e) {
e.printstacktrace();
}
}
}
/**
* 给图片添加水印、可设置水印图片旋转角度
*
* @param logotext
* 水印文字
* @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
* @param width
* 宽度(与左相比)
* @param height
* 高度(与顶相比)
* @param clarity
* 透明度(小于1的数)越接近0越透明
*/
public static void watermarkbytext(string logotext, string srcimgpath,
string targerpath, integer degree, integer width, integer height,
float clarity) {
// 主图片的路径
inputstream is = null;
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);
}
// 设置颜色
g.setcolor(color.red);
// 设置 font
g.setfont(new font("宋体", font.bold, 30));
float alpha = clarity;
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop,
alpha));
// 第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y) .
g.drawstring(logotext, width, height);
g.dispose();
os = new fileoutputstream(targerpath);
// 生成图片
imageio.write(buffimg, "jpg", os);
system.out.println("添加水印文字完成!");
} 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();
}
}
}
}
还有一个图片缩放代码:
复制代码 代码如下:
/**
* 图片缩放(图片等比例缩放为指定大小，空白部分以白色填充)
*
* @param srcpath
* 源图片路径
* @param destpath
* 缩放后图片路径
*/
public static void zoomimage(string srcpath, string destpath, int destheight, int destwidth) {
try {
bufferedimage srcbufferedimage = imageio.read(new file(srcpath));
int imgwidth = destwidth;
int imgheight = destheight;
int srcwidth = srcbufferedimage.getwidth();
int srcheight = srcbufferedimage.getheight();
if (srcheight >= srcwidth) {
imgwidth = (int) math.round(((destheight * 1.0 / srcheight) * srcwidth));
} else {
imgheight = (int) math.round(((destwidth * 1.0 / srcwidth) * srcheight));
}
bufferedimage destbufferedimage = new bufferedimage(destwidth, destheight, bufferedimage.type_int_rgb);
graphics2d graphics2d = destbufferedimage.creategraphics();
graphics2d.setbackground(color.white);
graphics2d.clearrect(0, 0, destwidth, destheight);
graphics2d.drawimage(srcbufferedimage.getscaledinstance(imgwidth, imgheight, image.scale_smooth), (destwidth / 2) - (imgwidth / 2), (destheight / 2) - (imgheight / 2), null);
graphics2d.dispose();
imageio.write(destbufferedimage, "jpeg", new file(destpath));
} catch (ioexception e) {
e.printstacktrace();
}
}