怎么用FW把下载下来的水印打到图片上（越详细越好）？

怎么用FW把下载下来的水印打到图片上（越详细越好）？

用过滤器,等我上线给你,不要结问题哦 package com.jc.ts.services; import java.awt.Color; import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.sun.image.codec.jpeg.ImageFormatException; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class WaterMark { @SuppressWarnings("deprecation") public static void createMarkSize(String sizeContext,HttpServletRequest request,HttpServletResponse response) { try { String path=request.getRealPath(request.getServletPath()); FileInputStream in=new FileInputStream(path); Image src=ImageIO.read(in); int w=src.getWidth(null); int h=src.getHeight(null); BufferedImage img=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);//构建画板 Graphics g=img.getGraphics();//得到画笔 g.drawImage(src,0,0,w,h,null);//把源图片写入画板 g.setColor(Color.red); g.drawString(sizeContext,10,5); // 添加文字 g.dispose();//生成图片 JPEGImageEncoder e=JPEGCodec.createJPEGEncoder(response.getOutputStream()); e.encode(img); response.getOutputStream().close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ImageFormatException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @SuppressWarnings("deprecation") public static void createMarkLogo(String localPath,HttpServletRequest request,HttpServletResponse response) { try { FileInputStream file=new FileInputStream(localPath); Image fimg=ImageIO.read(file); int fw=fimg.getWidth(null); int fh=fimg.getHeight(null); String path=request.getRealPath(request.getServletPath()); FileInputStream in=new FileInputStream(path); Image src=ImageIO.read(in); int w=src.getWidth(null); int h=src.getHeight(null); BufferedImage img=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);//构建画板 Graphics g=img.getGraphics();//得到画笔 g.drawImage(src,0,0,w,h,null);//把原图片写入画板 g.drawImage(fimg,w-20,h-15,fw,fh,null);//把水印图片写入画板 g.dispose();//生成图片 JPEGImageEncoder e=JPEGCodec.createJPEGEncoder(response.getOutputStream()); e.encode(img); response.getOutputStream().close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ImageFormatException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } @SuppressWarnings("deprecation") public static void createMarkLogo(String localPath,HttpServletRequest request,HttpServletResponse response,int width,int height) { try { FileInputStream file=new FileInputStream(localPath); Image fimg=ImageIO.read(file); int fw=fimg.getWidth(null); int fh=fimg.getHeight(null); String path=request.getRealPath(request.getServletPath()); FileInputStream in=new FileInputStream(path); Image src=ImageIO.read(in); int w=src.getWidth(null);//w为你过滤图片的宽度 int h=src.getHeight(null);//h为你过滤图片的长度 BufferedImage img=new BufferedImage(w+width,h+height,BufferedImage.TYPE_INT_RGB);//构建画板(画板的宽度为两个图片之和) Graphics g=img.getGraphics();//得到画笔 g.drawImage(src,0,0,w,h,null);//把原图片写入画板 g.drawImage(fimg,width,height,fw,fh,null);//把水印图片写入画板 g.dispose();//生成图片 JPEGImageEncoder e=JPEGCodec.createJPEGEncoder(response.getOutputStream()); e.encode(img); response.getOutputStream().close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ImageFormatException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 注意第三个方法的注释地方g.drawImage(fimg,width,height,fw,fh,null);根据参数你在调调(放原图下面的) 过滤器调用 package com.jc.ts.filter; 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.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.jc.ts.services.WaterMark; public class WaterFilter implements Filter { public void destroy() { // TODO Auto-generated method stub } public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { HttpServletRequest request=(HttpServletRequest)arg0; HttpServletResponse response=(HttpServletResponse)arg1; //WaterMark.createMarkSize("南京ts", request, response); //WaterMark.createMarkLogo("D:\\workspace\\mybook\\WebRoot\\images\\logo\\book.jpg", request, response); WaterMark.createMarkLogo("D:\\workspace\\mybook\\WebRoot\\images\\logo\\book.jpg", request, response,20,30); //注意路径为绝对路径且三个效果不能同时执行 } public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } } web.xml配置(写在servlet上面) <filter> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <filter-name>WaterFilter</filter-name> <filter-class>com.jc.ts.filter.WaterFilter</filter-class> </filter> 希望你能满意。。。。。。