Uploadify 控件上传图片 + 预览

 jquery的Uploadify控件上传图片和预览使用介绍。

   在简单的servlet系统中和在SSH框架中，后台处理不同的，在三大框架中图片预览时费了不少力气，所以下面将两种情况都介绍一下。

   1，前台代码

script：

$("#uploadify").uploadify({
    'langFile'       : '<%=request.getContextPath()%>/config/juploadify/uploadifyLang_cn.js',
    'swf'            : '<%=request.getContextPath()%>/config/juploadify/uploadify.swf',
    'uploader'       : '<%=request.getContextPath()%>/UploadAction/uploadImg.action', //图片上传的action方法
    'queueID'        : 'fileQueue',
    'auto'           : true,
    'multi'          : true,
    'buttonCursor'   : 'hand',
    'fileObjName'    : 'uploadify',
    'buttonText'     : '上传图片',
    'height'         : '25',
    'progressData'   : 'percentage',
    'fileTypeDesc'   : '支持格式:jpg/gif/jpeg/png/bmp.',
    'fileTypeExts': '*.jpg;*.gif;*.jpeg;*.png;*.bmp',//允许的格式
    onUploadSuccess  : function(file,data,response) {
        //设置图片预览
        var _arr_val = data.split(",");
        $("#photo").val(_arr_val[1]);
        $("#pic_view").attr("src","<%=request.getContextPath()%>" + _arr_val[1]);
    }
});

html

<td width="15%" rowspan="9" align="center">
    <div id="fileQueue" style="200px;"></div>
    <input type="file" name="uploadify" id="uploadify" />
    <input type="hidden" name="photo" id="photo" value="">
    <div id="pic_view_div" style="150px; height:180px">
         <img src="<%=request.getContextPath()%>/image/nopic.gif" width="150" height="180" id="pic_view">
    </div>
</td>

   2，servlet中后台处理

public void uploadImg(){
    // 解决服务器端消息返回客户端后中文字符乱码
    response.setHeader("Content-Type", "text/html;charset=UTF-8");
    HttpSession session = request.getSession();
    PrintWriter outs = response.getWriter();

    //获取上传图片的路径
    String savePath = request.getSession().getServletContext().getRealPath("");
    String saveDirectory = savePath + "/Imgupload";
    File file = new File(saveDirectory);
    if (!file.exists()) {
        file.mkdirs();
    }

    //设置图片大小
    if (StringUtils.isBlank(this.fileSizeLimit.toString())) {
        this.fileSizeLimit = "100";// 默认100M
    }
    int maxPostSize = Integer.valueOf(this.fileSizeLimit).intValue() * 1024 * 1024;

    String encoding = "UTF-8";
    MultipartRequest multi = null;
    try {
        multi = new MultipartRequest(request, saveDirectory, maxPostSize, encoding);
    } catch (Exception e) {
        System.out.println("发生异常：" + e.getMessage());
        return;
    }

    //图片预览功能实现
    String _result = "";
    Enumeration files = multi.getFileNames();
    while (files.hasMoreElements()) {
        String name = (String) files.nextElement();
        File f = multi.getFile(name);
        if (f != null) {
            String fileName = multi.getFilesystemName(name);
            String lastFileName = saveDirectory + "/" + fileName;
            result += multi.getOriginalFileName(name) + "," + savePath + "/" + fileName;
        }
    }

    outs.print(_result);
}

注意：action方法返回的字符串为图片的名称和图片的路径。

 

     3，SSH框架中使用

     

package cn.com.zzcy.base.action;

import java.io.File;

@Namespace("/UploadAction")
public class UploadAction {
    private File uploadify;
    public File getUploadify() {
        return uploadify;
    }
    public void setUploadify(File uploadify) {
        this.uploadify = uploadify;
    }
    private String uploadifyFileName;
    public String getUploadifyFileName() {
        return uploadifyFileName;
    }
    public void setUploadifyFileName(String uploadifyFileName) {
        this.uploadifyFileName = uploadifyFileName;
    }

    /**
     * 上传图片
     * @throws IOException
     */
    @Action("uploadImg")
    public void uploadImg(){
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpServletResponse response = ServletActionContext.getResponse();
        String savePath = request.getSession().getServletContext().getRealPath("");
        PrintWriter out = null;
        String resultStr = "";
        String extName = "";// 扩展名
        String newFileName = "";// 新文件名
        try {
            response.setCharacterEncoding("utf-8");
            out = response.getWriter();

            //获取文件的扩展名
            if (uploadifyFileName.lastIndexOf(".") >= 0) {
                extName = uploadifyFileName.substring(uploadifyFileName.lastIndexOf("."));
            }
            //根据当前时间生成新的文件名称
            String nowTime = new SimpleDateFormat("yyyymmddHHmmss").format(new Date());// 当前时间
            newFileName = nowTime + extName;

            //设置文件保存路径
            String param = request.getParameter("param");
            savePath = savePath + "/ImgUpload/"+param+"/";
            File file = new File(savePath);
            if(!file.exists()){
                file.mkdirs();
            }
            uploadify.renameTo(new File(savePath+newFileName));
            resultStr = uploadifyFileName+","+"/ImgUpload/"+param+"/"+newFileName;
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            out.print(resultStr);
        }
    }

}

     注意：要定义局部变量并提供set方法，这样图片的名称和信息才能自动注入进入。

     这里通过request方法获取不到图片信息。。。

            
     4，实现的效果图如下：

     

原文出自：http://blog.csdn.net/lishuangzhe7047/article/details/41803175