本例子使用了jspsmart组件进行上传,这里可以免费下载该组件www.jspsmart.com 下载解压后,将jar包复制到 \WEB-INF\lib 目录后重启服务器,jspsmart即可正常使用了 1、uploadimage.jsp <%@ page contentType="text/html;charset=gb2312" language="java" import="java.io.*,java.awt.Image,java.awt.image.*,com.sun.image.codec.jpeg.*, java.sql.*,com.jspsmart.upload.*,java.util.*,cn.oof.database.*,cn.oof.house.*"%> <% 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"); //上载文件 mySmartUpload.upload(); } catch (Exception e){ %> <% } try{ com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0); if (myFile.isMissing()){%> <%} 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 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); //out.print(filename); //-----------------------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; 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 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(""); } } }catch (Exception e){ e.toString(); } %> 2 upload.htm |
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