1. 在第五篇架构基础上进行修改
2. 修改jsp页面
1 <html>
2 <head>
3 <base href="<%=basePath%>">
4
5 <title>dwr</title>
6 <script type='text/javascript' src='dwr/engine.js'></script>
7 <script type='text/javascript' src='dwr/util.js'></script>
8 <script type='text/javascript' src='dwr/interface/CoreServlet.js'></script>
9 </head>
10 <body>
11
12 <a id="fileName" href="javascript:downloadFile('E://main.jpg');">点击下载</a>
13
14 </body>
15 <script type="text/javascript">
16 function downloadFile(fileUrl) {
17 CoreServlet.downloadFile(fileUrl, function(data) {
18 dwr.engine.openInDownload(data);
19 });
20 }
21 </script>
22 </html>
3. 编写后台代码：
1 public class CoreServlet {
2
3 public FileTransfer downloadFile(String fileUrl) throws Exception {
4 String fileName = fileUrl.substring(fileUrl.lastIndexOf("//") + 2, fileUrl.length());
5 File file = new File(fileUrl);
6 FileInputStream fis = new FileInputStream(file);
7 return new FileTransfer(fileName, "text/plain", file.length(), fis);
8 }
9
10 }
