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 }