plupload2.1.2文件合并

1.前端

（1）依赖文件：

    <link type="text/css" rel="stylesheet" href="~/Content/plupload_2_1_2/jquery-ui.min.css" media="screen" />
    <link type="text/css" rel="stylesheet" href="~/Content/plupload_2_1_2/jquery.ui.plupload/css/jquery.ui.plupload.css" media="screen" />
    <script type="text/javascript" src="~/Content/plupload_2_1_2/jquery.js" charset="UTF-8"></script>
    <script type="text/javascript" src="~/Content/plupload_2_1_2/jquery-ui.min.js" charset="UTF-8"></script>
    <script type="text/javascript" src="~/Content/plupload_2_1_2/plupload.full.min.js" charset="UTF-8"></script>
    <script type="text/javascript" src="~/Content/plupload_2_1_2/jquery.ui.plupload/jquery.ui.plupload.min.js" ></script>
    <script type="text/javascript" src="~/Content/plupload_2_1_2/zh_CN.js" charset="UTF-8"></script>

（2）HTML

    <form id="uploader">
        <input type="text" name="filename" value="" />
    </form>

（3）js

   <script type="text/javascript">
        //文件名不能相同
        $(function () {
            $("#uploader").plupload({
                // General settings
                runtimes: 'gears,flash,silverlight,browserplus,html5',
                url: '/upload/plupload',
                max_file_size: '6079mb',
                max_file_count: 20,
                chunk_size: '2048kb',
                unique_names: false,
                init: {

                    // Resize images on clientside if we can
                    //resize: {  320, height: 240, quality: 90 },
                    rename: false, // 是否重命名文件
                    sortable: true, // Sort files
                    dragdrop: true, //启用文件到小部件能够拖放(操作)(目前唯一HTML5支持)
                    filters: [
                        { title: "Image files", extensions: "jpg,gif,png,txt,sql" },
                        { title: "music", extensions: "avi,mp4,mp3,exe,zip" }
                    ],
                    views: {
                        list: true,
                        thumbs: true, // Show thumbs
                        active: 'thumbs'
                    },
                    // Flash settings
                    flash_xap_url: '~/Content/upload/js/Moxie.xap',
                    // Silverlight settings
                    silverlight_xap_url: '~/Content/upload/js/Moxie.xap',
                    BeforeUpload: function (uploader, file) {
                        //alert(123)
                        //var $li = $('#uploader_filelist li').hasClass('plupload_file')[0]
                        //var value = $($li).find('div.plupload_file_name').attr('title')
                        //alert($li)
                    },
                    QueueChanged: function () {
                        var $li = $('#uploader_filelist li')
                        console.log($li)
                    },
                    FileUploaded: function (uploader, file, responseObject) {
                        //console.log(responseObject)
                        //alert(curDirID)
                        //initData(responseObject.response.curDirId)
                        $.ajax({
                            url: '/Cloudpan/GetCurdir',
                            type: 'post',
                            success: function (id) {
                                initData(id)
                            }
                        })
                    }
                }
            });
        });
    </script>

2.后台

　　后台可以使用FileInputStream的构造方法追加文件内容。plupload使用“multipart/form-data”这种表单上传文件，其中每一个分块会发出一次请求，表单中有两个字段，分别是“chunk”和“chunks”，其中“chunk”是当前正在处理的文件分块的序号（从0开始计数），而“chunks”则是文件的分块总数。

（1）.net

　　asp.net MVC【有bug】

/// <summary>
/// 文件上传
/// </summary>
/// <returns></returns> 
public JsonResult plupload(string name)
{ 
    string msg = string.Empty;
    string strchunk = Request["chunk"];
    string strchunks = Request["chunks"];
    int chunk = 0;
    int chunks = 0;
    int.TryParse(strchunk, out chunk);
    int.TryParse(strchunks, out chunks);

    foreach (string upload in Request.Files)
    {
        if (upload != null && upload.Trim() != "")
        {
            string path = AppDomain.CurrentDomain.BaseDirectory + "Temp\";
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            System.Web.HttpPostedFileBase postedFile = Request.Files[upload];
            string filename1 = Path.GetFileName(postedFile.FileName);
            string filename = name;
           
            string newFileName = filename;
            if (chunks>1)
            {
                newFileName = chunk + "_" + filename;
            }
            string fileNamePath = path + newFileName;
            postedFile.SaveAs(fileNamePath);

            if (chunks>1 && chunk + 1 == chunks)
            {
                using (FileStream fsw = new FileStream(path + filename, FileMode.Create, FileAccess.Write))
                {
                    BinaryWriter bw = new BinaryWriter(fsw);
                    // 遍历文件合并 
                    for (int i = 0; i < chunks; i++)
                    {
                        bw.Write(System.IO.File.ReadAllBytes(path + i.ToString() + "_" + filename));
                        bw.Flush();
                    }
                }

            }
             
        }
    } 
    return Json(new { jsonrpc = "2.0", result = "", id = "id" });
   
}

（2）servlet

config.properties:

uploadPath=/upload/images

package cn.getword.servlet;

import com.alibaba.fastjson.JSON;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.*;

@WebServlet(name = "FileUploadServlet", urlPatterns = {"/upload/plupload.do"})
public class FileUploadServlet extends HttpServlet {
    String uploadPath;
    private static final ResourceBundle bundle = ResourceBundle.getBundle( "config" );

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setCharacterEncoding( "UTF-8" );
        Integer chunk = null; /* 分割块数 */
        Integer chunks = null; /* 总分割数 */
        String tempFileName = null; /* 临时文件名 */
        String newFileName = null; /* 最后合并后的新文件名 */
        BufferedOutputStream    outputStream    = null;



        /* System.out.println(FileUtils.getTempDirectoryPath()); */
        uploadPath = request.getServletContext().getRealPath( bundle.getString( "uploadPath" ) );
        File up = new File( uploadPath );
        if ( !up.exists() )
        {
            up.mkdir();
        }

        if ( ServletFileUpload.isMultipartContent( request ) )
        {
            try {
                DiskFileItemFactory factory = new DiskFileItemFactory();
                factory.setSizeThreshold( 1024 );
                /* factory.setRepository(new File(repositoryPath));// 设置临时目录 */
                ServletFileUpload upload = new ServletFileUpload( factory );
                upload.setHeaderEncoding( "UTF-8" );
                /* upload.setSizeMax(5 * 1024 * 1024);// 设置附件最大大小，超过这个大小上传会不成功 */
                List<FileItem> items = upload.parseRequest( request );
                for ( FileItem item : items ){
                    if ( item.isFormField() ) /* 是文本域 */
                    {
                        if ( item.getFieldName().equals( "name" ) )
                        {
                            tempFileName = item.getString();
                            /* System.out.println("临时文件名：" + tempFileName); */
                        } else if ( item.getFieldName().equals( "chunk" ) )
                        {
                            chunk = Integer.parseInt( item.getString() );
                            /* System.out.println("当前文件块：" + (chunk + 1)); */
                        } else if ( item.getFieldName().equals( "chunks" ) )
                        {
                            chunks = Integer.parseInt( item.getString() );
                            /* System.out.println("文件总分块：" + chunks); */
                        }
                    } else { /* 如果是文件类型 */
                        if ( tempFileName != null )
                        {
                            String chunkName = tempFileName;
                            if ( chunk != null )
                            {
                                chunkName = chunk + "_" + tempFileName;
                            }
                            File savedFile = new File( uploadPath, chunkName );
                            item.write( savedFile );
                        }
                    }
                }

                // UUID+'.'+后缀名
                newFileName = UUID.randomUUID().toString().replace( "-", "" )
                        .concat( "." )
                        .concat( FilenameUtils.getExtension( tempFileName ) );
                if ( chunk != null && chunk + 1 == chunks )
                {
                    outputStream = new BufferedOutputStream(
                            new FileOutputStream( new File( uploadPath, newFileName ) ) );
                    /* 遍历文件合并 */
                    for ( int i = 0; i < chunks; i++ )
                    {
                        File tempFile = new File( uploadPath, i + "_" + tempFileName );
                        byte[] bytes = FileUtils.readFileToByteArray( tempFile );
                        outputStream.write( bytes );
                        outputStream.flush();
                        tempFile.delete();
                    }
                    outputStream.flush();
                }
                Map<String, Object> m = new HashMap<String, Object>();
                m.put( "status", true );
                m.put( "fileUrl", bundle.getString( "uploadPath" ) + "/"
                        + newFileName );
                response.getWriter().write( JSON.toJSONString( m ) );
            } catch ( FileUploadException e ) {
                e.printStackTrace();
                Map<String, Object> m = new HashMap<String, Object>();
                m.put( "status", false );
                response.getWriter().write( JSON.toJSONString( m ) );
            } catch ( Exception e ) {
                e.printStackTrace();
                Map<String, Object> m = new HashMap<String, Object>();
                m.put( "status", false );
                response.getWriter().write( JSON.toJSONString( m ) );
            } finally {
                try {
                    if ( outputStream != null )
                        outputStream.close();
                } catch ( IOException e ) {
                    e.printStackTrace();
                }
            }
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("/WEB-INF/views/student/uploadFile.jsp").forward(request, response);
    }
}

　　注意：

> request.getServletContext().getRealPath(virtualPath);  将虚拟路径转化成物理路径。

> ResourceBundle bundle = ResourceBundle.getBundle( "config" );
读取src下的config.properties文件。例如：file.config对应的文件为file包下config.properties文件