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() {
    }
}