image_upload_main.jsp:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>图片上传主界面</TITLE>
</head>
<body bgcolor="#efefef">
<div align="left"><br><p>
    <form name="baseinfo" action="#" method="post" enctype="multipart/form-data">
     图片类别:&nbsp;<select name="file_type">
   <%
     if(imagetypes!=null&&imagetypes.size()>0){
       for(int m=0;m<imagetypes.size();m++){
         String typeName=((Imagetype)imagetypes.getAt(m)).getType_name();
         out.print("<option value="+typeName+">"); 
         out.print(typeName);
         out.print("</option>");
        }
     }else{
       out.print("<option>没有为图片分类</option>");
     }
   %>
     </select>&nbsp;&nbsp;&nbsp;<a href="imagetype_addedit.jsp?opersType=add">添加类型</a><p>
   图片说明:&nbsp;<br><textarea rows="7" name="remark" cols="60"></textarea><p>
<%
Float imageSize=Float.valueOf(ConfigFile.UPLOADIMAGESIZE);
Float cImageSize=imageSize/(1024*1024);
 %>
请选择上传文件(小于<%=cImageSize%>M)<br>

<input type="file" name="file"/><p>
&nbsp;&nbsp;&nbsp;&nbsp;
<input type="button" value="返回" onclick="javascript:history.go(-1);">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<input type="submit" name="Submit" value="上传" onclick="checkAndSubmit();"/>
</form>

</div>
<script type="text/javascript">
  function checkAndSubmit(){
 
    var remark=document.getElementById("remark").value;
    var file_type=document.getElementById("file_type").value;
    var fileValue=document.getElementById("file").value;
   
    if(file_type==null||file_type==""){
         alert("没有为图片分类!");
         return;
      }
 
    if(remark==null||remark==""){
         alert("请添加图片说明!");
         return;
      }
 
    if(fileValue==null||fileValue==""){
         alert("请选择要上传的图片!");
         return;
    }
  
    var index=fileValue.lastIndexOf(".");
    var fm=fileValue.substring(index+1);
    if(fm=="jpg"||fm=="gif"||fm=="JPG"||fm=="GIF"){ 
        var index=fileValue.lastIndexOf("\\");
        var fileName=fileValue.substring(index+1);
        document.baseinfo.action="image_upload.jsp?remark="+remark+"&fileName="+fileName+"&file_type="+file_type+"&fileValue="+fileValue+"";
        document.baseinfo.submit();
      }else{
        alert("不支持该格式, 请正确选择!");
        return;
      }
  }
</script>
</body>
</html>


image_upload.jsp:

<%
  String platform=request.getParameter("platform");
  String remark=request.getParameter("remark");
  String cremark=new String(remark.getBytes("iso-8859-1"),"gbk");
  String file_type=request.getParameter("file_type");
  String cfile_type=new String(file_type.getBytes("iso-8859-1"),"gbk");
  String fileName=request.getParameter("fileName");
  String cfileName=new String(fileName.getBytes("iso-8859-1"),"gbk");
  String fileValue=request.getParameter("fileValue");
  String cfileValue=(new String(fileValue.getBytes("iso-8859-1"),"gbk")).replace("\\\\","\\");   

  String file_name="";
  String file_size="";
  String file_ext="";
  String file_path="";
  String new_name="";
  String cstrname="";
  java.io.File fileDir=new java.io.File(ConfigFile.IMAGEPATH);
  String[] files=fileDir.list();

  //判断是否为文件
  java.io.File file1=new java.io.File(cfileValue);
  if(!file1.exists()){
     %>
     <script type="text/javascript">
     alert("目录下不存在该文件!");
     window.location.href="image_upload_main.jsp";
     </script>
    <%
  }else{
  //判断是否已上传
  for(int n=0;n<files.length;n++){
       String checkFile=files[n];
       if(checkFile.equals(cfileName)){
      %>
       <script type="text/javascript">
       alert("不能重复上传!");
       window.location.href="image_upload_main.jsp";
       </script>
      <%
      }
   }
  }
try{
  SmartUpload su=new SmartUpload();
  su.initialize(pageContext);
  su.setMaxFileSize(ConfigFile.UPLOADIMAGESIZE);
  su.upload();
 
 
//上传文件的存放路径
  file_path=ConfigFile.IMAGEPATH.replace("//","/");
  int count=su.save(file_path);
  com.jspsmart.upload.File file=su.getFiles().getFile(0);
  file_name=file.getFileName();  
  file_size=String.valueOf(file.getSize());
  file_ext=file.getFileExt();
  int name_index=file_name.lastIndexOf(".");
  new_name=file_name.substring(0,name_index);
  if(file_size.equals("0")){
    java.io.File file2=new java.io.File(ConfigFile.IMAGEPATH+file_name);
    file2.delete();
  }
 
//-----------------------上传完成，开始生成缩略图-------------------------   
  java.io.File newfile = new java.io.File(ConfigFile.IMAGEPATH+file_name);         //读入刚才上传的文件
  Calendar calendar=Calendar.getInstance();
  Long tim=calendar.getTimeInMillis();
  cstrname=String.valueOf(tim);
  String newurl_min=ConfigFile.IMAGEPATH+cstrname+"_min."+file_ext;   //新的缩略图保存地址
  String newurl_mid=ConfigFile.IMAGEPATH+cstrname+"_mid."+file_ext;   //新的缩略图保存地址
  String newurl_big=ConfigFile.IMAGEPATH+cstrname+"_big."+file_ext;   //新的缩略图保存地址
  java.awt.Image src = javax.imageio.ImageIO.read(newfile);       //构造Image对象
   
  float tagsize_min=ConfigFile.IMAGE_MIN_WIDTH; //小图
  float tagsize_mid=ConfigFile.IMAGE_MID_WIDTH; //中图
  float tagsize_big=ConfigFile.IMAGE_BIG_WIDTH; //大图
 
  int old_w=src.getWidth(null);  //得到源图宽
  int old_h=src.getHeight(null); //得到源图高
  int new_w_min=0;
  int new_h_min=0;
 
  int new_w_mid=0;
  int new_h_mid=0;
 
  int new_w_big=0;
  int new_h_big=0;
 
  float tempdouble_min;
  float tempdouble_mid;
  float tempdouble_big;
 
  if(old_w>old_h){
  tempdouble_min=old_w/tagsize_min;
  tempdouble_mid=old_w/tagsize_mid;
  tempdouble_big=old_w/tagsize_big;
  }else{
  tempdouble_min=old_h/tagsize_min;
  tempdouble_mid=old_h/tagsize_mid;
  tempdouble_big=old_h/tagsize_big;
  }
  new_w_min=Math.round(old_w/tempdouble_min);
  new_h_min=Math.round(old_h/tempdouble_min);
 
  new_w_mid=Math.round(old_w/tempdouble_mid);
  new_h_mid=Math.round(old_h/tempdouble_mid);
 
  new_w_big=Math.round(old_w/tempdouble_big);
  new_h_big=Math.round(old_h/tempdouble_big);
 
  BufferedImage tag_min = new BufferedImage(new_w_min,new_h_min,BufferedImage.TYPE_INT_RGB);
  BufferedImage tag_mid = new BufferedImage(new_w_mid,new_h_mid,BufferedImage.TYPE_INT_RGB);
  BufferedImage tag_big = new BufferedImage(new_w_big,new_h_big,BufferedImage.TYPE_INT_RGB);
  tag_min.getGraphics().drawImage(src,0,0,new_w_min,new_h_min,null); //绘制缩小后的图
  tag_mid.getGraphics().drawImage(src,0,0,new_w_mid,new_h_mid,null); //绘制缩小后的图
  tag_big.getGraphics().drawImage(src,0,0,new_w_big,new_h_big,null); //绘制缩小后的图
  FileOutputStream newimage_min=new FileOutputStream(newurl_min); //输出到文件流
  FileOutputStream newimage_mid=new FileOutputStream(newurl_mid); //输出到文件流
  FileOutputStream newimage_big=new FileOutputStream(newurl_big); //输出到文件流
  JPEGImageEncoder encoder_min = JPEGCodec.createJPEGEncoder(newimage_min);
  JPEGImageEncoder encoder_mid = JPEGCodec.createJPEGEncoder(newimage_mid);
  JPEGImageEncoder encoder_big = JPEGCodec.createJPEGEncoder(newimage_big);
  encoder_min.encode(tag_min); //近JPEG编码
  encoder_mid.encode(tag_mid); //近JPEG编码
  encoder_big.encode(tag_big); //近JPEG编码
  newimage_min.close();
  newimage_mid.close();
  newimage_big.close();
 
 
}
catch(Exception e){
%>
   <script type="text/javascript">
    alert("图片太大!");
    window.location.href="image_upload_main.jsp";
   </script>
<%
}
%>