java学习教程:java中实现图片加水印的代码

【51Test.NET-java学习教程:java中实现图片加水印的代码】：

在这里介绍两种方法，分别是添加图片水印和文字水印，水印图片的格式可以是GIF,PNG的透明文件，我们一般采用的是PNG格式的图片，因为它的质量和GIF相比要高一些，源码如下：

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public final class TestCenter {
public TestCenter() {

}

/**//*
* public final static String getPRessImgPath() { return applicationContext
* .getRealPath("/template/data/util/shuiyin.gif"); }
*/

/** *//**
* 把图片印刷到图片上
*
* @param pressImg --
* 水印文件
* @param targetImg --
* 目标文件
* @param x
* --x坐标
* @param y
* --y坐标
*/
public final static void pressImage(String pressImg, String targetImg,
int x, int y) {
try {
//目标文件
File _file = new File(targetImg);
System.out.println("file: "+_file.toString()+">>>>"+targetImg);
Image src = ImageIO.read(_file);
int wideth = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(wideth, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.drawImage(src, 0, 0, wideth, height, null);

//水印文件
File _filebiao = new File(pressImg);
Image src_biao = ImageIO.read(_filebiao);
int wideth_biao = src_biao.getWidth(null);
int height_biao = src_biao.getHeight(null);
g.drawImage(src_biao, (wideth - wideth_biao) / 2,
(height - height_biao) / 2, wideth_biao, height_biao, null);
//水印文件结束
g.dispose();
FileOutputStream out = new FileOutputStream(targetImg);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}

/** *//**
* 打印文字水印图片
*
* @param pressText
* --文字
* @param targetImg --
* 目标图片
* @param fontName --
* 字体名
* @param fontStyle --
* 字体样式
* @param color --
* 字体颜色
* @param fontSize --
* 字体大小
* @param x --
* 偏移量
* @param y
*/

public static void pressText(String pressText, String targetImg,
String fontName, int fontStyle, int color, int fontSize, int x,
int y) {
try {
File _file = new File(targetImg);
Image src = ImageIO.read(_file);
int wideth = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(wideth, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.drawImage(src, 0, 0, wideth, height, null);
// String s="www.jzxue";
g.setColor(Color.RED);
g.setFont(new Font(fontName, fontStyle, fontSize));

g.drawString(pressText, wideth - fontSize - x, height - fontSize
/ 2 - y);
g.dispose();
FileOutputStream out = new FileOutputStream(targetImg);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
} catch (Exception e) {
System.out.println(e);
}
}

public static void main(String[] args) {
pressImage("D:\\123.gif","D:\\aa.gif", 0, 0);
//pressText("刘若英,我很好,后来...","D:\\aa.gif", "宋体", 16, 10, 16, 200, 300);
}
}

第二种是添加文字水印：

import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.swing.*;
import com.sun.image.codec.jpeg.*;

public class TestCenter {
/** *//**
* 给图片添加水印
*
* @param filePath
* 需要添加水印的图片的路径
* @param markContent
* 水印的文字
* @param markContentColor
* 水印文字的颜色
* @param qualNum
* 图片质量
* @return
*/
public boolean createMark(String filePath, String markContent,
Color markContentColor, float qualNum) {
ImageIcon imgIcon = new ImageIcon(filePath);
Image theImg = imgIcon.getImage();
int width = theImg.getWidth(null);
int height = theImg.getHeight(null);
BufferedImage bimage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = bimage.createGraphics();
g.setColor(markContentColor);
g.setBackground(Color.white);
g.drawImage(theImg, 0, 0, null);
g.drawString(markContent, width / 5, height / 5); // 添加水印的文字和设置水印文字出现的内容
g.dispose();
try {
FileOutputStream out = new FileOutputStream(filePath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);
param.setQuality(qualNum, true);
encoder.encode(bimage, param);
out.close();
} catch (Exception e) {
return false;
}
return true;
}

public static void main(String[] args)
{
TestCenter tc = new TestCenter();
tc.createMark("D:\\123.gif", "水印的文字", Color.red, 1);
}

}

JAVA