public ActionForward execute(ActionMapping mapping, ActionForm form,

			HttpServletRequest request, HttpServletResponse response) {

		UsersService service=new UsersService();

		ArrayList<Users> userList = service.getUserList();

		request.setAttribute("userList", userList);

		return mapping.findForward("showuser");

	}

public ArrayList<Users> getUserList()

	{

		String sql="select * from _users";

		List<Object[]> al = SqlHelper.executeQuery(sql, null);

		ArrayList<Users> userList=new ArrayList<Users>();

		Users user=new Users();

		for(Object[] obj:al)

		{

			user.setUsername((String) obj[0]);

			user.setPhoto((String) obj[1]);

			user.setPhoto2((String) obj[2]);

			userList.add(user);

		}

		return userList;

	}

 <h1>用户列表</h1>

   		<c:forEach items="${userList}" var="user">

   		${user.username} <img src="/StrutsFileUpAndDown/file/${user.photo}" width=50px/><a href="/StrutsFileUpAndDown/downloadFile.do?filename=${user.username}">点击下载</a><br/>

   		  </c:forEach>

	public ActionForward execute(ActionMapping mapping, ActionForm form,

			HttpServletRequest request, HttpServletResponse response) {

		FileInputStream fis=null;

		OutputStream os=null;

		String fileName = request.getParameter("filename");

		UsersService usersService=new UsersService();

		Users user = usersService.getUser(fileName);

		//下载文件

		//1.先获取到下载文件的绝对路径

		String filePath = this.getServlet().getServletContext().getRealPath("/file");

		String userPhoto = user.getPhoto();

		response.setContentType("text/html;charset=utf-8");

		//如果文件具有中文，则需要进行Url编码

		//设置一个头，告诉浏览器有文件要下载

		try {

			response.setHeader("Content-Disposition","attachement; filename="+java.net.URLEncoder.encode(userPhoto,"utf-8"));

		} catch (UnsupportedEncodingException e1) {

			e1.printStackTrace();

		}

		String fileAllPath=filePath+"\\"+userPhoto;

		byte []buff=new byte[1024];

		int len=0;

		try {

			fis=new FileInputStream(fileAllPath);

			os=response.getOutputStream();

			while((len=fis.read(buff))!=-1)

			{

				os.write(buff,0,len);

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

		finally{

			try {

				fis.close();

				os.close();

			} catch (IOException e) {

				e.printStackTrace();

			}

		}

		return mapping.findForward("goback");

	}

	public Users getUser(String username)

	{

		String sql="select * from _users where username=?";

		String[] parameter={username};

		ArrayList<Object[]> al = SqlHelper.executeQuery(sql, parameter);

		Object[] objects = al.get(0);

		Users user=new Users();

		user.setUsername((String) objects[0]);

		user.setPhoto((String) objects[1]);

		user.setPhoto2((String) objects[2]);

		return user;

	}