Jsp文件下载

Servlet里面doGet方法：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//1. 获取下载文件的路径
		String realPath = "F:\\workspace\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0\\wtpwebapps\\upload\\WEB-INF\\upload\\3c7f271c-883b-48b5-bc58-13f6aad225fa/01.gif";
		//2. 获取下载的文件名
		String fileName = realPath.substring(realPath.lastIndexOf("/")+1); 
		System.out.println(fileName);
		try {
			//3. 设置浏览器能够支持下载需要的文件
			response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileName,"UTF-8")); //中文文件名URLEncoder.encod编码,否则可能乱码
			//4. 获取下载文件的输入流
			FileInputStream inputStream = new FileInputStream(realPath);
			//5. 创建缓冲区
			int len = 0;
			byte buffer[] =new byte[1024];
			//6. 获取OutputStream对象
			OutputStream outputStream = response.getOutputStream();
			//7. 将FileOuTputStream流写入到buff缓冲区,使用OutputStream将缓冲区的数据输出到客户端
			while((len=inputStream.read(buffer)) > 0) {
				outputStream.write(buffer,0,len);
			}
			inputStream.close();
			outputStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
}

在jsp中直接调用这个servlet就行了，用一个a标签。