java 图片上传的处理，获取图片大小，宽高。

jsp代码

<%@page language="java" pageEncoding="UTF-8"%>

<div align="center">
  <table class="formtable" width="100%">
    <tbody>
      <tr>
        <th> 名称</th>
        <td><form:input path="name" style="width:150px;" required="true" /><span class="must_star">*</span></td>
      </tr>
      <tr>
        <th>图片</th>
        <td> <input type="file" name="file"/></td>
      </tr>
      <tr>
        <th>内容</th>
        <td><form:textarea path="memo" cols="80" row=""/></td>
      </tr>
      <tr>
        <td colspan="2">
          <div align="center">
            <input id="Submit" class="button blocking" name="Submit" value="提交" type="submit">
          </div>
        </td>
      </tr>
    </tbody>
  </table>

</div>

js 方法

    $(form).ajaxSubmit({
                type: "POST",
                url:"photoes/addup",
                dataType: "json",
                success: function(data){
            if(data.status === "ok") {
              alert("保存成功");
            } else {
              alert(data.data);
            }
                }
    });

js 插件地址 http://malsup.github.io/jquery.form.js

java 代码

 @RequestMapping( value = "/addup", method = RequestMethod.POST, produces = "text/plain; charset=UTF-8" )
  @ResponseBody
  public String do_addup( @RequestParam( value = "file", required = false ) MultipartFile file, HttpServletRequest request, Photo photo )
  {

    try
    {
      String imageSavePath = "D:/Program Files"
      Date now = new Date();

      /**
       * 设置默认图片存放的路径
       */
      String fileSavePath = imageSavePath;

      if( !fileSavePath.endsWith( "/" ) )
      {
        fileSavePath += "/";
      }

      SimpleDateFormat dataFormat = new SimpleDateFormat( "yyyy'/'MMdd" );
      String newSaveFilePath = dataFormat.format( new Date() ) + "/";
      fileSavePath += newSaveFilePath;
      /**
       * 目录不存在创建新目录
       */
      File dir = new File( fileSavePath );
      if( !dir.exists() )
      {
        dir.mkdirs();
      }

      if( file.isEmpty() )
      {
        throw new WrongArgumentException( "请上传图片" );
      }

      String[] nameArray = file.getOriginalFilename().split( "\\." );
      String suffix = nameArray[nameArray.length - 1];
      /**
       * 生成uuid作为文件名称
       */
      String fileName = UUID.randomUUID().toString().replaceAll( "-", "" ) + "." + suffix;
      newSaveFilePath += fileName;
      fileSavePath += fileName;

      /**
       * 获得文件类型（可以判断如果不是图片，禁止上传）
       */
      File newFile = new File( fileSavePath );
      file.transferTo( newFile );

      /**
       * 获取图片的宽高
       */
      BufferedImage sourceImg = ImageIO.read( new FileInputStream( newFile ) );
      
      double width = sourceImg.getWidth();
      double height = sourceImg.getHeight();
      double size = file.getSize();

    }
    catch( Exception e )
    {
      e.printStackTrace();
    }
  }