图片上传和上传缩略图

1、需要Jspsmart.jar包 Upload.html<table border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td height="45" align="center" valign="middle"> <form action="uploadimage.jsp" method="post"

2、; enctype="multipart/form-data" name="form1">请选择上传的图片 <input type="file" name="file"><input type="submit" name="Submit" value="上传"> </form></td> </tr></table>Uploadimage.jsp<% page languag

3、e="java" import="java.util.*" pageEncoding="UTF-8"%><% page import="java.io.*,java.awt.Image,java.awt.image.*,com.sun.image.codec.jpeg.*,java.sql.*,java.awt.Color,com.jspsmart.upload.*,java.util.*"%><% page import="haobaobao.servlet.WaterMark;

4、"%><%String path = request.getContextPath();String basePath = request.getScheme()+":/"+request.getServerName()+":"+request.getServerPort()+path+"/"%><%SmartUpload mySmartUpload =new SmartUpload();long file_size_max=4000000;String fileName2="",

5、ext="",testvar=""String url="uploadfile/images/" /应保证在根目录中有此目录的存在String saveurl="" /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(); System.out.println(filename); /初始化mySmartUpload.initi

6、alize(pageContext);/只允许上载此类文件try mySmartUpload.setAllowedFilesList("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=''upfile.jsp'' </script><%try com.jspsma

7、rt.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=''upfile.jsp'' </script> <% else / String myFileName=myFile.getFileName(); /取得上载的文件的文件名 ext= myFile.getF

8、ileExt(); /取得后缀名 int file_size=myFile.getSize(); /取得文件的大小 if(file_size<file_size_max) saveurl=request.getRealPath("/")+url; saveurl+=filename+"."+ext; /保存路径 myFile.saveAs(saveurl,mySmartUpload.SAVE_PHYSICAL); /WaterMark wm = new WaterMark();/wm.createMark(saveurl, "韩 坤 &q

9、uot;, Color.red, 70f, "黑体 ",23);/-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=200; / in

10、t 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)

11、;/计算新图长宽 / BufferedImage tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB); / tag.getGraphics().drawImage(src,0,0,new_w,new_h,null); /绘制缩小后的图 / FileOutputStream newimage=new FileOutputStream(newurl); /输出到文件流 / JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage); / encoder.encode(tag); /近JPEG编码 / newimage.close(); 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=&#