本文实例讲述了Java实现给图片添加图片水印，文字水印及马赛克的方法。分享给大家供大家参考，具体如下：
可以在eclipse中新建个Utils类，把以下代码复制进去直接使用，以下方法实现单个或多个水印的添加
package com.rzxt.fyx.common.util;
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 javax.imageio.ImageIO;
import javax.swing.ImageIcon;
public class MarkImageUtils {
public static void main(String[] args) {
String output = "F:/images/";
String source = "F:/images/6.jpg"; //源图片路径
String icon = "F:/images/icon2.png"; //覆盖图片路径
String imageName = "mark_image"; //图片名称
String imageType = "jpg"; //图片类型jpg,jpeg,png,gif
String text = "加水印了";
int size = 4; //马赛克大小
Integer degree = null; //水印旋转角度-45，null表示不旋转
String result = null;
//给图片添加图片水印
result = MarkImageUtils.markImageByMoreIcon(icon,source,output,imageName,imageType,degree);
// result = MarkImageUtils.markImageBySingleIcon(icon, source, output, imageName, imageType, degree);
// //给图片添加文字水印
// result = MarkImageUtils.markImageByMoreText(source,output,imageName,imageType,Color.red,text,degree);
// result = MarkImageUtils.markImageBySingleText(source,output,imageName,imageType,Color.red,text,degree);
// //给图片打马赛克
// result = MarkImageUtils.markImageByMosaic(source,output,imageName,imageType,size);
System.out.println(result);
}
public static String markImageByMoreIcon(String icon,String source,String output,String imageName,String imageType,Integer degree) {
String result = "添加图片水印出错";
try {
File file = new File(source);
File ficon = new File(icon);
if (!file.isFile()) {
return source + " 不是一个图片文件!";
}
//将icon加载到内存中
Image ic = ImageIO.read(ficon);
//icon高度
int icheight = ic.getHeight(null);
//将源图片读到内存中
Image img = ImageIO.read(file);
//图片宽
int width = img.getWidth(null);
//图片高
int height = img.getHeight(null);
BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//创建一个指定 BufferedImage 的 Graphics2D 对象
Graphics2D g = bi.createGraphics();
//x,y轴默认是从0坐标开始
int x = 0;
int y = 0;
//默认两张水印图片的间隔高度是水印图片的1/3
int temp = icheight/3;
int space = 1;
if(height>=icheight){
space = height/icheight;
if(space>=2){
temp = y = icheight/2;
if(space==1||space==0){
x = 0;
y = 0;
}
}
}else{
x = 0;
y = 0;
}
//设置对线段的锯齿状边缘处理
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
//呈现一个图像，在绘制前进行从图像空间到用户空间的转换
g.drawImage(img.getScaledInstance(width,height,Image.SCALE_SMOOTH),0,0,null);
for(int i=0;iheight){
break;
}
if (null != degree) {
//设置水印旋转
g.rotate(Math.toRadians(degree),(double) bi.getWidth() / 2, (double) bi.getHeight() / 2);
}
g.setFont(font);
//水印位置
g.drawString(word, x, y);
y+=(2*size);
}
g.dispose();
//输出图片
File sf = new File(output, imageName+"."+imageType);
ImageIO.write(bi, imageType, sf); // 保存图片
result = "图片完成添加Word水印";
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
public static String markImageBySingleText(String source,String output,String imageName,String imageType,Color color,String word,Integer degree) {
String result = "添加文字水印出错";
try {
//读取原图片信息
File file = new File(source);
if (!file.isFile()) {
return file + " 不是一个图片文件!";
}
Image img = ImageIO.read(file);
int width = img.getWidth(null);
int height = img.getHeight(null);
//加水印
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
g.drawImage(img, 0, 0, width, height, null);
//设置水印字体样式
Font font = new Font("宋体", Font.PLAIN, 50);
//根据图片的背景设置水印颜色
g.setColor(color);
if (null != degree) {
//设置水印旋转
g.rotate(Math.toRadians(degree),(double) bi.getWidth() / 2, (double) bi.getHeight() / 2);
}
g.setFont(font);
int x = width/3;
int y = height/2;
//水印位置
g.drawString(word, x, y);
g.dispose();
//输出图片
File sf = new File(output, imageName+"."+imageType);
ImageIO.write(bi, imageType, sf); // 保存图片
result = "图片完成添加Word水印";
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
public static String markImageByMosaic(String source,String output,String imageName,String imageType,int size){
String result = "图片打马赛克出错";
try{
File file = new File(source);
if (!file.isFile()) {
return file + " 不是一个图片文件!";
}
BufferedImage img = ImageIO.read(file); // 读取该图片
int width = img.getWidth(null); //原图片宽
int height = img.getHeight(null); //原图片高
BufferedImage bi = new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
//马赛克格尺寸太大或太小
if (width < size || height < size) {
return "马赛克格尺寸太大";
}
if(size<=0){
return "马赛克格尺寸太小";
}
int xcount = 0; //x方向绘制个数
int ycount = 0; //y方向绘制个数
if (width % size == 0) {
xcount = width / size;
} else {
xcount = width / size + 1;
}
if (height % size == 0) {
ycount = height / size;
} else {
ycount = height / size + 1;
}
int x = 0; //x坐标
int y = 0;
//y坐标
//绘制马赛克(绘制矩形并填充颜色)
Graphics2D g = bi.createGraphics();
for (int i = 0; i < xcount; i++) {
for (int j = 0; j < ycount; j++) {
//马赛克矩形格大小
int mwidth = size;
int mheight = size;
if(i==xcount-1){ //横向最后一个不够一个size
mwidth = width-x;
}
if(j == ycount-1){ //纵向最后一个不够一个size
mheight = height-y;
}
//矩形颜色取中心像素点RGB值
int centerX = x;
int centerY = y;
if (mwidth % 2 == 0) {
centerX += mwidth / 2;
} else {
centerX += (mwidth - 1) / 2;
}
if (mheight % 2 == 0) {
centerY += mheight / 2;
} else {
centerY += (mheight - 1) / 2;
}
Color color = new Color(img.getRGB(centerX, centerY));
g.setColor(color);
g.fillRect(x, y, mwidth, mheight);
y = y + size;// 计算下一个矩形的y坐标
}
y = 0;// 还原y坐标
x = x + size;// 计算x坐标
}
g.dispose();
File sf = new File(output, imageName+"."+imageType);
ImageIO.write(bi, imageType, sf); // 保存图片
result = "打马赛克成功";
}catch(Exception e){
e.printStackTrace();
}
return result;
}
}
更多java相关内容感兴趣的读者可查看本站专题：《Java图片操作技巧汇总》、《java日期与时间操作技巧汇总》、《Java操作DOM节点技巧总结》、《Java文件与目录操作技巧汇总》及《Java数据结构与算法教程》。
希望本文所述对大家java程序设计有所帮助。
