`
solitary
  • 浏览: 71709 次
社区版块
存档分类
最新评论

DWR3.0 文件上传

    博客分类：
  • web
DWR文件上传 
阅读更多

DWR3.0 文件上传

引自：http://tyyler.blog.51cto.com/4030931/730599

java方法中的参数必须是BufferedImage，InputStream，FileTransfer三种中其中一个，

一般推荐使用FileTransfer，可以获取文件名、文件大小、和内置的inputStream。

后台实现文件上传方法

    public String fileUploadForDwr(ArrayList<FileTransfer> fileTransfer) {  
     
            String tmp = "error";  
     
            String fileName = ""; // 文件名  
     
            String newFileName = ""; // 新文件名  
     
            InputStream streamIn = null;  
     
            OutputStream streamOut = null;  
              
            long size = 1024 * 1024 * 5;   
              
            if(fileTransfer.size() > size){  
                  
                return "文件不得大于5M";  
                  
            }  
     
            WebContext webContext = WebContextFactory.get();  
            String saveurl = webContext.getHttpServletRequest().getSession()  
                    .getServletContext().getRealPath("/upload");  
            for (FileTransfer obj : fileTransfer) {  
                if (obj.getFilename() != null && !obj.getFilename().equals("")) {  
                    fileName = obj.getFilename();  
                    if (fileName.lastIndexOf("\\") > -1) {  
                        fileName = fileName  
                                .substring(fileName.lastIndexOf("\\") + 1);  
                    }  
                    System.out.println(fileName);  
                    newFileName = ""
                            + fileName.substring(fileName.indexOf("."));  
                    try {  
     
                        streamIn = obj.getInputStream();  
                        streamOut = new FileOutputStream(new File(saveurl,  
                                newFileName));  
                        int bytesRead = 0;  
                        byte[] buffer = new byte[81920];  
                        while ((bytesRead = streamIn.read(buffer, 0, 81920)) != -1) {  
                            streamOut.write(buffer, 0, bytesRead);  
                        }  
                        streamOut.close();  
                        streamIn.close();  
                        tmp="success";  
                    } catch (FileNotFoundException ex) {  
     
                    } catch (IOException e) {  
                        // TODO: handle exception  
                    } finally {  
     
                        streamIn = null;  
                        streamOut = null;  
                    }  
     
                }  
            }  
            return tmp;  
        }

前台调用页面：

    <%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
     
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
        <head>
     
            <title>dwr3 文件上传</title>
     
            <meta http-equiv="pragma" content="no-cache">
            <meta http-equiv="cache-control" content="no-cache">
            <meta http-equiv="expires" content="0">
            <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
            <meta http-equiv="description" content="This is my page">
              
            <script type="text/javascript" src="/dwr/engine.js"></script>
            <script type="text/javascript" src="/dwr/util.js"></script>
            <script type="text/javascript" src="/dwr/interface/dwrFileUtil.js"></script>
              
            <script type="text/javascript">

             //解决谷歌浏览器无法上传的问题
             var isChrome = (/\bchrome\b/).test(navigator.userAgent.toLowerCase());
    dwr.engine.transport.iframe.loadingComplete = function(batchId) {
    var batch = dwr.engine._batches[batchId];
    if(!isChrome)
    if (batch) dwr.engine.batch.validate(batch);
    };
               function uploadFile(){  
                 var file=dwr.util.getValue("attach");  
                 var str="123"
                 var fileArr =  new Array();//注意这里是用的集合，无论一个附件还是多个附件都可以了  
                 fileArr[0] = file;  
                 dwrFileUtil.fileUploadForDwr(fileArr,{callback:function (data){back(str,data)}});  
               }  
                 
               function back(tmp,data){  
                 alert(3);  
                 alert(tmp+""+data);  
                   
               }  
            </script>
        </head>
     
        <body>
            <input type="file" name="attach">
            <br />
            <input type="button" name="btnSub" onclick="uploadFile()" value="文件上传">
        </body>
    </html>

DWR 配置：

    <create creator="new" javascript = "dwrFileUtil">   
        <param name="class" value="FileUpload" />  
        <include method = "fileUploadForDwr" />
    </create>

分享到：
| jquery之ajaxfileupload异步上传插件
评论
发表评论

您还没有登录,请您登录后再发表评论

相关推荐

Magicbox
Global site tag (gtag.js) - Google Analytics