SmartUpload实现下载的简单代码

最新推荐文章于 2016-09-28 14:25:32 发布

yangyangyang0102

最新推荐文章于 2016-09-28 14:25:32 发布

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分类专栏： java基础文章标签： smartupload 下载文件

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又好久没特么写笔记了，这样岂能进步与辉煌，要鞭策自己常写！

先来个简单的：

工程目录结构如下：

SmartUpload先简单用一下文件下载的处理。简单的运用，我就直接用Servlet进行操作了。

1、先建立一个指向页面的ToDownloadFileServlet，并且读取指定路径下的所有文件列表，展示在页面：

（在这之前配置servlet的时候，没注意@WebServlet("/toDownloadFile")这个注解，导致tomcat启动失败等很恶心的问题，切记仔细）

@WebServlet("/toDownloadFile")
public class ToDownloadFileServlet extends HttpServlet {
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//response.sendRedirect("WEB-INF/jsp/help/downloadFile.jsp");
			
		String path = this.getServletContext().getRealPath("/FileDownload") ;
		File f = new File(path);
		if(!f.exists()) {
			System.out.println(path + "路径不存在");
		}
		
		File[] file = f.listFiles();
		List<String> fileNameList = new ArrayList<String>();
		for(int i = 0; i < file.length; i++) {
			if(file[i].isDirectory()) {
				i++;
				continue;
			}
			fileNameList.add(file[i].getName());
		}
		request.setAttribute("fileNameList", fileNameList);
		
		
		request.getRequestDispatcher("WEB-INF/jsp/help/downloadFile.jsp").forward(request, response);
	}

}

2、jsp页面的相关代码贴上来（这部分简单）

<div class="rightinfo">
    
	    <table id="table" class="tablelist">
	    	<thead>
	    		<tr>
		        	<th width="50px">序号</th>
		        	<th width="200px">文件名称</th>
		        	<th width="100px">操作</th>
	        	</tr>
	        </thead>
	        <tbody>
	        <c:forEach items="${fileNameList }" var="fileName" varStatus="status">
		        <tr>
			        <td>${status.index+1 }</td>
			        <td>${fileName }</td>
			        <td><a href="downloadFile?fileName=${fileName }">下载</a></td>
		        </tr>
		        
		    </c:forEach>

	        </tbody>
	    </table>
		
</div>

3、用于文件下载的DownloadFileServlet

@WebServlet("/downloadFile")
public class DownloadFileServlet extends HttpServlet {
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		String fileName = request.getParameter("fileName");
		SmartUpload su = new SmartUpload();
		su.initialize(getServletConfig(), request, response);
		su.setContentDisposition(null);
		try {
			su.downloadFile("/FileDownload/" + fileName);
		} catch (SmartUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

基本就是这样子了，很简单，后面会弄一下springMVC的上传和下载！