1. 文字水印
import sun.font.fontdesignmetrics;
import javax.imageio.imageio;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
/**
* @author chengjiansheng
* @date 2021/6/10
*/
public class watermarkutil
{
public static void main(string[] args) throws ioexception
{
addtext("f:/1.jpeg", "我的梦想是成为火影");
}
/**
* 加文字水印
* @param srcpath 原文件路径
* @param content 文字内容
* @throws ioexception
*/
public static void addtext(string srcpath, string content) throws ioexception
{
// 读取原图片信息
bufferedimage srcimage = imageio.read(new file(srcpath));
int width = srcimage.getwidth();
int height = srcimage.getheight();
// 创建画笔，设置绘图区域
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = bufferedimage.creategraphics();
g.drawimage(srcimage, 0, 0, width, height, null);
// g.drawimage(srcimage.getscaledinstance(width, height, image.scale_smooth), 0, 0, null);
g.setfont(new font("宋体", font.plain, 32));
g.setcolor(color.red);
// 计算文字长度
int len = g.getfontmetrics(g.getfont()).charswidth(content.tochararray(), 0, content.length());
fontdesignmetrics metrics = fontdesignmetrics.getmetrics(g.getfont());
int len2 = metrics.stringwidth(content);
system.out.println(len);
system.out.println(len2);
// 计算文字坐标
int x = width - len - 10;
int y = height - 20;
// int x = width - 2 * len;
// int y = height - 1 * len;
g.drawstring(content, x, y);
g.dispose();
// 输出文件
fileoutputstream fos = new fileoutputstream("f:/2.png");
imageio.write(bufferedimage, "png", fos);
fos.flush();
fos.close();
}
}
可以设置文字透明度
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, 0.8f));
2. 旋转文字
import sun.font.fontdesignmetrics;
import javax.imageio.imageio;
import java.awt.*;
import java.awt.geom.affinetransform;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
/**
* @author chengjiansheng
* @date 2021/6/10
*/
public class watermarkutil
{
// 水印透明度
private static final float alpha = 0.5 f;
// 水印文字字体
private static final font font = new font("宋体", font.bold, 30);
// 水印文字颜色
private static final color color = color.red;
public static void main(string[] args) throws ioexception
{
addtext("f:/1.jpeg", "图片由木叶村提供，仅供忍者联军使用！");
}
/**
* 加文字水印
* @param srcpath 原文件路径
* @param content 文字内容
* @throws ioexception
*/
public static void addtext(string srcpath, string content) throws ioexception
{
// 读取原图片信息
bufferedimage srcimage = imageio.read(new file(srcpath));
int width = srcimage.getwidth();
int height = srcimage.getheight();
// 创建画笔，设置绘图区域
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = bufferedimage.creategraphics();
g.drawimage(srcimage, 0, 0, width, height, null);
// g.drawimage(srcimage.getscaledinstance(width, height, image.scale_smooth), 0, 0, null);
// 旋转文字
affinetransform affinetransform = g.gettransform();
affinetransform.rotate(math.toradians(-30), 0, 0);
font rotatedfont = font.derivefont(affinetransform);
g.setfont(rotatedfont); // 字体
g.setcolor(color); // 颜色
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha)); // 透明度
// 计算文字长度
int len = g.getfontmetrics(g.getfont()).charswidth(content.tochararray(), 0, content.length());
fontdesignmetrics metrics = fontdesignmetrics.getmetrics(g.getfont());
int len2 = metrics.stringwidth(content);
system.out.println(len);
system.out.println(len2);
// 计算水印文字坐标
int x = width / 5;
int y = height / 3 * 2;
g.drawstring(content, x, y);
g.dispose();
// 输出文件
fileoutputstream fos = new fileoutputstream("f:/2.png");
imageio.write(bufferedimage, "png", fos);
fos.flush();
fos.close();
}
}
画矩形框
import sun.font.fontdesignmetrics;
import javax.imageio.imageio;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
/**
* @author chengjiansheng
* @date 2021/6/10
*/
public class watermarkutil
{
// 水印透明度
private static final float alpha = 0.5 f;
// 水印文字字体
private static final font font = new font("宋体", font.bold, 30);
// 水印文字颜色
private static final color color = color.red;
public static void main(string[] args) throws ioexception
{
addtext("f:/1.jpeg", "图片由木叶村提供，仅供忍者联军使用！");
}
/**
* 加文字水印
* @param srcpath 原文件路径
* @param content 文字内容
* @throws ioexception
*/
public static void addtext(string srcpath, string content) throws ioexception
{
// 读取原图片信息
bufferedimage srcimage = imageio.read(new file(srcpath));
int width = srcimage.getwidth();
int height = srcimage.getheight();
// 创建画笔，设置绘图区域
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = bufferedimage.creategraphics();
g.drawimage(srcimage, 0, 0, width, height, null);
g.setfont(font); // 字体
g.setcolor(color); // 颜色
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha)); // 透明度
// 计算文字宽高度
fontdesignmetrics metrics = fontdesignmetrics.getmetrics(font);
int textwidth = metrics.stringwidth(content); // 文字宽度
int textheight = metrics.getheight(); // 文字高度
// 计算文字坐标
int x = (width - textwidth) / 2;
int y = (height + textheight) / 2;
// 写文字
g.drawstring(content, x, y);
// 画矩形
int padding = 10; // 内边距
g.drawrect(x - padding / 2, y - textheight, textwidth + padding, textheight + padding);
g.dispose();
// 输出文件
fileoutputstream fos = new fileoutputstream("f:/2.png");
imageio.write(bufferedimage, "png", fos);
fos.flush();
fos.close();
}
}
3. 旋转坐标轴
import sun.font.fontdesignmetrics;
import javax.imageio.imageio;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
/**
* @author chengjiansheng
* @date 2021/6/10
*/
public class watermarkutil
{
// 水印透明度
private static final float alpha = 0.5 f;
// 水印文字字体
private static final font font = new font("宋体", font.bold, 30);
// 水印文字颜色
private static final color color = color.red;
public static void main(string[] args) throws ioexception
{
addtext("f:/1.jpeg", "图片由木叶村提供，仅供忍者联军使用！");
}
/**
* 加文字水印
* @param srcpath 原文件路径
* @param content 文字内容
* @throws ioexception
*/
public static void addtext(string srcpath, string content) throws ioexception
{
// 读取原图片信息
bufferedimage srcimage = imageio.read(new file(srcpath));
int width = srcimage.getwidth();
int height = srcimage.getheight();
// 创建画笔，设置绘图区域
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = bufferedimage.creategraphics();
g.drawimage(srcimage, 0, 0, width, height, null);
g.setfont(font); // 字体
g.setcolor(color); // 颜色
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha)); // 透明度
// 计算文字宽高度
fontdesignmetrics metrics = fontdesignmetrics.getmetrics(font);
int textwidth = metrics.stringwidth(content); // 文字宽度
int textheight = metrics.getheight(); // 文字高度
// 旋转坐标轴
g.translate(-width / 5, height / 4);
g.rotate(-30 * math.pi / 180);
// 计算文字坐标
int x = (width - textwidth) / 2;
int y = (height + textheight) / 2;
// 写文字
g.drawstring(content, x, y);
// 画矩形
int padding = 10; // 内边距
g.drawrect(x - padding / 2, y - textheight, textwidth + padding, textheight + padding);
g.dispose();
// 输出文件
fileoutputstream fos = new fileoutputstream("f:/2.png");
imageio.write(bufferedimage, "png", fos);
fos.flush();
fos.close();
}
}
结合下载功能，完整的代码如下：
/**
* 下载
*/
@
getmapping("/download")
public void download(@requestparam("mediaid") string mediaid, httpservletrequest request, httpservletresponse response) throws ioexception
{
sysfile sysfile = sysfileservice.getbymediaid(mediaid);
if(null == sysfile)
{
throw new illegalargumentexception("文件不存在");
}
string mimetype = request.getservletcontext().getmimetype(sysfile.getpath());
system.out.println(mimetype);
response.setcontenttype(sysfile.getcontenttype());
response.setheader(httpheaders.content_disposition, "attachment;filename=" + urlencoder.encode(sysfile.getoriginalfilename(), "utf-8"));
// fileinputstream fis = new fileinputstream(sysfile.getpath());
servletoutputstream sos = response.getoutputstream();
watermarkutil.addtext(sysfile.getpath(), "哈哈哈哈", sos);
// ioutils.copy(fis, sos);
// ioutils.closequietly(fis);
ioutils.closequietly(sos);
}
import sun.font.fontdesignmetrics;
import javax.imageio.imageio;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.ioexception;
import java.io.outputstream;
/**
* @author chengjiansheng
* @date 2021/6/10
*/
public class watermarkutil
{
// 水印透明度
private static final float alpha = 0.5 f;
// 水印文字字体
private static final font font = new font("宋体", font.bold, 30);
// 水印文字颜色
private static final color color = color.red;
/**
* 加文字水印
* @param srcpath 原文件路径
* @param content 文字内容
* @throws ioexception
*/
public static void addtext(string srcpath, string content, outputstream outputstream) throws ioexception
{
// 读取原图片信息
bufferedimage srcimage = imageio.read(new file(srcpath));
int width = srcimage.getwidth();
int height = srcimage.getheight();
// 画板
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
// 画笔
graphics2d g = bufferedimage.creategraphics();
g.drawimage(srcimage, 0, 0, width, height, null);
g.setfont(font); // 字体
g.setcolor(color); // 颜色
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha)); // 透明度
// 计算文字宽高度
fontdesignmetrics metrics = fontdesignmetrics.getmetrics(font);
int textwidth = metrics.stringwidth(content); // 文字宽度
int textheight = metrics.getheight(); // 文字高度
// 旋转坐标轴
g.translate(-width / 5, height / 4);
g.rotate(-30 * math.pi / 180);
// 计算文字坐标
int x = (width - textwidth) / 2;
int y = (height + textheight) / 2;
// 写文字
g.drawstring(content, x, y);
// 画矩形
int padding = 10; // 内边距
g.drawrect(x - padding / 2, y - textheight, textwidth + padding, textheight + padding);
g.dispose();
// 输出
imageio.write(bufferedimage, "png", outputstream);
}
}
另外的写法
import javax.imageio.imageio;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileoutputstream;
/**
* @projectname: test
* @package: com.test.utils
* @classname: mytest
* @author: luqiming
* @description:
* @date: 2020/10/29 11:48
* @version: 1.0
*/
public class addwatermarkutil {
public static void waterpress(string srcimgpath, string outimgpath,
color markcontentcolor, int fontsize, string watermarkcontent) {
try {
string[] watermarkcontents = watermarkcontent.split("\\|\\|");
// 读取原图片信息
file srcimgfile = new file(srcimgpath);
image srcimg = imageio.read(srcimgfile);
int srcimgwidth = srcimg.getwidth(null);
int srcimgheight = srcimg.getheight(null);
// 加水印
bufferedimage bufimg = new bufferedimage(srcimgwidth, srcimgheight, bufferedimage.type_int_rgb);
// 得到画笔对象
graphics2d g = bufimg.creategraphics();
// 设置起点
g.drawimage(srcimg, 0, 0, srcimgwidth, srcimgheight, null);
font font = new font("宋体", font.plain, fontsize);
// 根据图片的背景设置水印颜色
g.setcolor(markcontentcolor);
// 设置水印文字字体
g.setfont(font);
// 数组长度
int contentlength = watermarkcontents.length;
// 获取水印文字中最长的
int maxlength = 0;
for (int i = 0; i < contentlength; i++) {
int fontlen = getwatermarklength(watermarkcontents[i], g);
if (maxlength < fontlen) {
maxlength = fontlen;
}
}
for (int j = 0; j < contentlength; j++) {
watermarkcontent = watermarkcontents[j];
int tempx = 10;
int tempy = fontsize;
// 单字符长度
int tempcharlen = 0;
// 单行字符总长度临时计算
int templinelen = 0;
stringbuffer sb = new stringbuffer();
for (int i = 0; i < watermarkcontent.length(); i++) {
char tempchar = watermarkcontent.charat(i);
tempcharlen = getcharlen(tempchar, g);
templinelen += tempcharlen;
if (templinelen >= srcimgwidth) {
// 长度已经满一行,进行文字叠加
g.drawstring(sb.tostring(), tempx, tempy);
// 清空内容,重新追加
sb.delete(0, sb.length());
templinelen = 0;
}
// 追加字符
sb.append(tempchar);
}
// 通过设置后两个输入参数给水印定位
g.drawstring(sb.tostring(), 20, srcimgheight - (contentlength - j - 1) * tempy-50);
}
g.dispose();
// 输出图片
fileoutputstream outimgstream = new fileoutputstream(outimgpath);
imageio.write(bufimg, "jpg", outimgstream);
outimgstream.flush();
outimgstream.close();
} catch (exception e) {
e.printstacktrace();
}
}
public static int getcharlen(char c, graphics2d g) {
return g.getfontmetrics(g.getfont()).charwidth(c);
}
/**
* 获取水印文字总长度
*
* @paramwatermarkcontent水印的文字
* @paramg
* @return水印文字总长度
*/
public static int getwatermarklength(string watermarkcontent, graphics2d g) {
return g.getfontmetrics(g.getfont()).charswidth(
watermarkcontent.tochararray(), 0, watermarkcontent.length());
}
public static void main(string[] args) {
// 原图位置, 输出图片位置, 水印文字颜色, 水印文字
string font = "张天爱||就很完美||2020-05-27 17:00:00";
string inputaddress = "f:/upupoowallpaper/1.jpg";
string outputaddress = "f:/upupoowallpaper/1.jpg";
color color = color.green;
waterpress(inputaddress, outputaddress, color, 50, font);
}
}
添加效果
关于水印位置，需要修改：
//左下角 g.drawstring(sb.tostring(), 0, srcimgheight - (contentlength - j - 1) * tempy); //右下角 g.drawstring(sb.tostring(), srcimgwidth - maxlength, srcimgheight - (contentlength - j - 1) * tempy);
以上就是java用自带的image io给图片添加水印的详细内容，更多关于java 图片添加水印的资料请关注www.887551.com其它相关文章！
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