Jersey实现文件上传下载

一 文件上传

　　使用ajaxFileUpload进行文件上传的前端处理。在ajaxFileupload.js中，针对服务端返回的类型增加text判断，

　　

    //ajax文件上传
    function ajaxFileUpload(){
        $.ajaxFileUpload({
            type:"post",
            url: "../rest/api/file/upload", //用于文件上传的服务器端请求地址
            secureuri: false, //是否需要安全协议，一般设置为false
            fileElementId: "file", //文件上传域的ID

　　　　　　　　dataType: "text", //返回值类型 一般设置为json
　　　　　　　　//contentType:"application/x-www-form-urlencoded;charset=UTF-8",
　　　　　　　　success: function (data) {//服务器成功响应处理函数
　　　　　　　　　　data = JSON.parse(data);

                if (data.status == 'ok') {
                    //进行execl解析，并返回数据更新进度条
                    var user_tagIds = $("#old_import_usertag_tagIds").val();
                    poiExecl(data.location, user_tagIds);
                   // $('#progressModual').modal('show');
                    timer = setInterval("updateProgress()",'1000');
                }else{
                    $('#progressPage').remove();
                    $('#uploadProgress').html("文件上传失败!");
                }
            },
            complete: function(xmlHttpRequest) {  
                $("#file").on("change", filechange);
            },
            error: function (data, status, e){
                 //服务器响应失败处理函数
            }
        });
    }

　　后端业务处理

　　返回的数据类型，指定媒体类型Mediatype为TEXT_PLAIN.

    @POST
    @Path("/upload")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.TEXT_PLAIN)
    public Response uploadTemp(
            @FormDataParam("file") final InputStream uploadedInputStream,
            @FormDataParam("file") final FormDataContentDisposition fileDetail) {
        final String fileName = fileDetail.getFileName();
        final String uploadedFileLocation = getClass().getResource(
                "/uploadtemp").getFile()
                + UUID.randomUUID()
                + fileName.substring(fileName.lastIndexOf("."),
                        fileName.length());
        FileUtil.writeToFile(uploadedInputStream, uploadedFileLocation);
        final JSONObject obj = new JSONObject();
        obj.put("status", "ok");
        obj.put("location", uploadedFileLocation);
        return Response.ok(obj, MediaType.APPLICATION_JSON).status(200)
                .entity(obj).build();
    }

　　使用的媒体类型指定：MediaType.MULTIPART_FORM_DATA 

二 文件下载

　　前端

$tempDownBtn.click(function() {
        var tempTypeDOM = document
                .getElementsByName("tempType");
        var tempType = "";
        for (var i = 0; i < tempTypeDOM.length; i++) {
            if (tempTypeDOM[i].checked) {
                tempType = tempTypeDOM[i].value;
            }
        }
        if ("" == tempType) {

        } else {
            location.href = "../rest/api/file/down?tempType="
                    + tempType;
        }
    });

　　后端

    /**
     * 功能说明：模板下载
     * @param servletContext context
     * @param request 请求
     * @param response 响应
     * @param tempType 模板类型
     * @return <br/>
     *         修改历史：<br/>
     *         1.[2015年10月21日下午4:04:29] 创建方法 by hewu
     */
    @GET
    @Path("/down")
    @Consumes({ MediaType.APPLICATION_FORM_URLENCODED,
            MediaType.APPLICATION_JSON })
    public HttpServletResponse downTemp(
            @Context final ServletContext servletContext,
            @QueryParam("tempType") final String tempType) {
        String path = null;
        if (ExcelConstans.TEMP_TYPE_PERSON.equals(tempType)) {
            path = servletContext
                    .getRealPath(ExcelConstans.ERR_PERSON_ACCOUNT_UPLOAD_DIR);
        } else if (ExcelConstans.TEMP_TYPE_ORGANIZE.equals(tempType)) {
            path = servletContext
                    .getRealPath(ExcelConstans.ERR_ORGANIZE_ACCOUNT_UPLOAD_DIR);
        } else {
            return response;
        }
        final File file = new File(path);
        String filename = file.getName();

　　　　　　try {
　　　　　　　　//针对IE5~10 request.getHeader("User-Agent").toUpperCase().indexOf("MSIE")
　　　　　　　　//针对IE11 request.getHeader("User-Agent").indexOf("rv:11")
　　　　　　　　if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0
　　　　　　　　|| request.getHeader("User-Agent").indexOf("rv:11") > -1) {
　　　　　　　　filename = URLEncoder.encode(filename, "UTF-8");
　　　　　　} else {
　　　　　　　　filename = new String(filename.getBytes("UTF-8"), "ISO8859-1");
　　　　　　}

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            LOG.error("error to  transition code", e);
        }
        InputStream fis = null;
        byte[] buffer = null;
        try {
            fis = new BufferedInputStream(new FileInputStream(path));
            buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            response.reset();
            response.addHeader("Content-Disposition", "attachment;filename="
                    + filename);
            response.addHeader("Content-Length", "" + file.length());
            final OutputStream toClient = new BufferedOutputStream(
                    response.getOutputStream());
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            LOG.error("error to down load", e);
        } catch (IOException e) {
            e.printStackTrace();
            LOG.error("error to down load", e);
        }
        return response;
    }

 附录：

　　提供本人修改过的ajaxFileupload.js

　　

jQuery.extend({
    createUploadIframe: function(id, uri)
    {
            //create frame
            var frameId = 'jUploadFrame' + id;
            var ua=navigator.userAgent.toLowerCase();  
            if(window.ActiveXObject) {
                //ie 9~10
                if ((ua.match(/msie/) != null) || (ua.match(/trident/) != null)) {  
                    var io = document.createElement('iframe');  
                    io.id = frameId;  
                    io.name = frameId;  
                    //ie 6~8
                 } else if (!$.support.leadingWhitespace || 'undefined' == typeof(document.body.style.maxHeight)) {  
                    var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');  
                    if (typeof uri == 'boolean') {  
                      io.src = 'javascript:false';  
                    } else if (typeof uri == 'string') {  
                      io.src = uri;  
                    }  
                 }  
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io            
    },
    createUploadForm: function(id, fileElementId)
    {
        //create form    
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');    
        var oldElement = $('#' + fileElementId);
        var newElement = $(oldElement).clone();
        $(oldElement).attr('id', fileId);
        $(oldElement).before(newElement);
        $(oldElement).appendTo(form);
        //set attributes
        $(form).css('position', 'absolute');
        $(form).css('top', '-1200px');
        $(form).css('left', '-1200px');
        $(form).appendTo('body');        
        return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout        
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = s.fileElementId;        
        var form = jQuery.createUploadForm(id, s.fileElementId);
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;        
        // Watch for a new set of requests
        if ( s.global && ! jQuery.active++ )
        {
            jQuery.event.trigger( "ajaxStart" );
        }            
        var requestDone = false;
        // Create the request object
        var xml = {}   
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        // Wait for a response to come back
        var uploadCallback = function(isTimeout)
        {            
            var io = document.getElementById(frameId);
            try 
            {                
                if(io.contentWindow)
                {
                     xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                     xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
                     
                }else if(io.contentDocument)
                {
                     xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                    xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
                }                        
            }catch(e)
            {
                jQuery.handleError(s, xml, null, e);
            }
            if ( xml || isTimeout == "timeout") 
            {                
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if ( status != "error" )
                    {
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = jQuery.uploadHttpData( xml, s.dataType );    
                        // If a local callback was specified, fire it and pass it the data
                        if ( s.success )
                            s.success( data, status );
    
                        // Fire the global callback
                        if( s.global )
                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                    } else
                        jQuery.handleError(s, xml, status);
                } catch(e) 
                {
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                }

                // The request was completed
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );

                // Handle the global AJAX counter
                if ( s.global && ! --jQuery.active )
                    jQuery.event.trigger( "ajaxStop" );

                // Process result
                if ( s.complete )
                    s.complete(xml, status);

                jQuery(io).unbind()

                setTimeout(function()
                                    {    try 
                                        {
                                            $(io).remove();
                                            $(form).remove();    
                                            
                                        } catch(e) 
                                        {
                                            jQuery.handleError(s, xml, null, e);
                                        }                                    

                                    }, 100)

                xml = null

            }
        }
        // Timeout checker
        if ( s.timeout > 0 ) 
        {
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);
        }
        try 
        {
           // var io = $('#' + frameId);
            var form = $('#' + formId);
            $(form).attr('action', s.url);
            $(form).attr('method', 'POST');
            $(form).attr('target', frameId);
            if(form.encoding)
            {
                form.encoding = 'multipart/form-data';                
            }
            else
            {                
                form.enctype = 'multipart/form-data';
            }            
            $(form).submit();

        } catch(e) 
        {            
            jQuery.handleError(s, xml, null, e);
        }
        if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }         
        return {abort: function () {}};    

    },

    uploadHttpData: function( r, type ) {  
        var data = !type;  
        data = type == "xml" || data ? r.responseXML : r.responseText;  
        // If the type is "script", eval it in global context  
        if ( type == "script" )  
            jQuery.globalEval( data );  
        // Get the JavaScript object, if JSON is used.  
        if ( type == "json" ) {  
             ////////////以下为新增代码///////////////  
             data = r.responseText;  
             var start = data.indexOf(">");  
             if(start != -1) {  
               var end = data.indexOf("<", start + 1);  
               if(end != -1) {  
                 data = data.substring(start + 1, end);  
                }  
             }  
              ///////////以上为新增代码///////////////  
              eval( "data = " + data);  
        }
        if(type="text"){
            data = $(data).text();
        }
        // evaluate scripts within html  
        if ( type == "html" )  
            jQuery("<div>").html(data).evalScripts();  
  
        return data;  
    } ,
    
    handleError: function( s, xhr, status, e )      {  
        // If a local callback was specified, fire it  
                if ( s.error ) {  
                    s.error.call( s.context || s, xhr, status, e );  
                }  
  
                // Fire the global callback  
                if ( s.global ) {  
                    (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );  
                }  
    } 

    
})