import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Demo4 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { //服务端通知浏览器以下载的方式打开图片 response.setHeader("content-disposition","attachment;filename=d1.jpg"); InputStream is = new FileInputStream(new File(""D:/TOOL/MyEclipseSpace/day04/WebRoot/images/cc.jpg")); OutputStream os = response.getOutputStream(); byte[] buf = new byte[1024]; int len = 0; while( (len=is.read(buf))>0 ){ os.write(buf,0,len); } is.close(); os.close(); }}