java 图片加水印不失真_JAVA给图片加水印（无损原图片）

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

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

import javax.imageio.ImageIO;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.OutputStream;

import java.util.List;

public class WaterPress {

private static List logoImgs;

private static List bgImgs;

private static boolean flag;

public static List getBgImgs() {

return bgImgs;

}

/**

* 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

* @param out 输出流(可以来自HttpServletReponse的输出)

*/

public final static void pressImage(String pressImg, String targetImg,

int x, int y, OutputStream out) {

try {

// 目标文件

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);

// 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();

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(从右下角算起)

* @param y --

* 偏移量(从右下角算起)

* @param out 输出流(可以来自HttpServletReponse的输出)

*/

public static void pressText(String pressText, String targetImg,

String fontName, int fontStyle, int color, int fontSize, int x,

int y, OutputStream out) {

try {

File _file = new File(targetImg);

Image src = ImageIO.read(_file);

int wideth = src.getWidth(null);

int height = src.getHeight(null);

//只有图片的宽或高大于200的时候才添加水印(小图片不添加)

if (wideth > 200 || height > 200) {

BufferedImage image = new BufferedImage(wideth, height,

BufferedImage.TYPE_INT_RGB);

Graphics g = image.createGraphics();

g.drawImage(src, 0, 0, wideth, height, null);

g.setColor(new Color(color));

g.setFont(new Font(fontName, fontStyle, fontSize));

g.drawString(pressText, wideth - fontSize - x, height

- fontSize / 2 - y);

g.dispose();

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(image);

out.close();

}

} catch (Exception e) {

System.out.println(e);

}

}

}

水印过滤器

package com.zone.aquila.filter;

import java.awt.Color;

import java.awt.Font;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import com.zone.aquila.web.upload.WaterPress;

import com.zone.aquila.web.upload.WaterMark;

public class WaterMarkFilter extends HttpServlet implements Filter {

private FilterConfig filterConfig;

// Handle the passed-in FilterConfig

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain filterChain) throws IOException, ServletException {

HttpServletRequest req = (HttpServletRequest) request;

// 获取请求中的图片路径

String filePath = req.getServletPath();// 这是相对路径(并且包括了上下文路径)

String fileRealPath = filterConfig.getServletContext().getRealPath(

filePath);// 得到绝对路径

// 调用工具类加水印(由于是动态从流中加水印，因此不会修改服务器上原图片)

WaterPress.pressText("http://www.myzone.com", fileRealPath, "宋体", 1, Color.ORANGE.getRGB(), 15, 180, 15, response.getOutputStream());

("http://www.myzone.com", fileRealPath, "宋体", 2, 1, 22, 50, 50);

filterChain.doFilter(request, response);

}

// Clean up resources

@Override

public void destroy() {

}

}