jsp上传头像以及生成缩略图(已修改,已加效果图)

<%@ page autoFlush="false" contentType="text/html;charset=utf-8" language="java" import="java.io.*,java.awt.Image,java.awt.image.*,com.sun.image.codec.jpeg.*,java.sql.*,com.jspsmart.upload.*,java.util.*,java.io.FileInputStream,java.io.FileOutputStream,java.awt.*"%><%@ page import="com.blog.vo.*" %><%SmartUpload mySmartUpload =new SmartUpload();long file_size_max=4000000;String fileName2="",ext="",testvar="";String url="uploadfile/images/"; //应保证在根目录中有此目录的存在//初始化mySmartUpload.initialize(pageContext);//只允许上载此类文件try {mySmartUpload.setAllowedFilesList("jpg,gif,JPG,GIF");//上载文件 mySmartUpload.upload();} catch (Exception e){%><SCRIPT language=javascript>alert("只允许上传.jpg和.gif类型图片文件");window.location='face.jsp';</script><%}try{ com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);if (myFile.isMissing()){%><SCRIPT language=javascript>alert("请先选择要上传的文件");window.location='face.jsp';</script><%}else{//String myFileName=myFile.getFileName(); //取得上载的文件的文件名ext= myFile.getFileExt(); //取得后缀名int file_size=myFile.getSize(); //取得文件的大小 String saveurl="";if(file_size<file_size_max){//更改文件名，取得当前上传时间的毫秒数值Calendar calendar = Calendar.getInstance();String filename = String.valueOf(calendar.getTimeInMillis()); saveurl=request.getRealPath("/")+url;saveurl+=filename+"."+ext; //保存路径myFile.saveAs(saveurl,mySmartUpload.SAVE_PHYSICAL);//-----------------------上传完成，开始生成缩略图------------------------- java.io.File file = new java.io.File(saveurl); //读入刚才上传的文件String newurl=request.getRealPath("/")+url+filename+"_min."+ext; //新的缩略图保存地址Image src = javax.imageio.ImageIO.read(file); //构造Image对象float tagsize=110;int old_w=src.getWidth(null); //得到源图宽int old_h=src.getHeight(null); int new_w=0;int new_h=0; //得到源图长int tempsize;float tempdouble; if(old_w>old_h){tempdouble=old_w/tagsize;}else{tempdouble=old_h/tagsize;}new_w=Math.round(old_w/tempdouble);new_h=Math.round(old_h/tempdouble);//计算新图长宽BufferedImage image = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);//创建一个BufferedImage来作为图像*作容器 Graphics g = image.getGraphics(); //创建一个绘图环境来进行绘制图象 g.drawImage(src,0,0,new_w,new_h,null); //将原图像数据流载入这个BufferedImage g.setFont(new Font("Times New Roman",Font.PLAIN,24)); //设定文本字体 String rand = ""; g.setColor(Color.red); //设定文本颜色 g.drawString(rand,new_w-200,new_h-10); //向BufferedImage写入文本字符 g.dispose(); //使更改生效FileOutputStream newimage=new FileOutputStream(newurl); //输出到文件流JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage); encoder.encode(image); //近JPEG编码newimage.close(); UserInfo ui = (UserInfo)request.getSession().getAttribute("userinfo");ui.setFace(url+filename+"_min."+ext);session.setAttribute("userinfo",ui);String turl="face.jsp?src="+url+filename+"_min."+ext;out.print("<SCRIPT language='javascript'>");out.print("window.location='"+turl+"'");out.print("</SCRIPT>");}else{out.print("<SCRIPT language='javascript'>");out.print("alert('上传文件大小不能超过"+(file_size_max/1000)+"K');");out.print("window.location='face.jsp;'");out.print("</SCRIPT>");}}}catch (Exception e){e.toString();}%>

头像效果图：