DWR第六篇之文件下载

时间：2023-03-09 14:28:46
DWR第六篇之文件下载

1. 在第五篇架构基础上进行修改

2. 修改jsp页面

 <html>

 <head>

 <base href="<%=basePath%>">

 <title>dwr</title>

 <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/CoreServlet.js'></script>

 </head>

 <body>

     <a id="fileName" href="javascript:downloadFile('E://main.jpg');">点击下载</a>

 </body>

 <script type="text/javascript">

     function downloadFile(fileUrl) {

         CoreServlet.downloadFile(fileUrl, function(data) {

             dwr.engine.openInDownload(data);

         });

     }

 </script>

 </html>

3. 编写后台代码：

 public class CoreServlet {

     public FileTransfer downloadFile(String fileUrl) throws Exception {

         String fileName = fileUrl.substring(fileUrl.lastIndexOf("//") + 2, fileUrl.length());

         File file = new File(fileUrl);

         FileInputStream fis = new FileInputStream(file);

         return new FileTransfer(fileName, "text/plain", file.length(), fis);

     }

 }

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