云笔记的项目分析(4):个人中心,加载头像

<div class="col-md-4"><img style="width:240px;height:200px" src="user?action=userHead&imageName=${user.head }"></div> else if("userCenter".equals(action)){ //进入个人中心 userCenter(request,response); }else if("userHead".equals(action)){ //加载头像 userHead(request,response); } private void userCenter(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置动态页面 request.setAttribute("changePage", "user/info.jsp"); //请求转发到首页 request.getRequestDispatcher("index.jsp").forward(request, response); }

index页面中设置了动态包含,设置changePage,request的setAttribute的里面,user/info.jsp

<c:if test="${!empty changePage }"> <jsp:include page="${changePage }"></jsp:include> </c:if>

加载头像设置:

private void userHead(HttpServletRequest request, HttpServletResponse response) throws IOException { //1.接受参数（头像名称) String imageName = request.getParameter("imageName"); //2.判断是否为空 if (StringUtil.isEmpty(imageName)) { return; } //3.得到文件存放服务器的真实路径 request.getServletContext().getRealPath("/WEB-INF/upload/"+头像名称); String filePath = request.getServletContext().getRealPath("/WEB-INF/upload/"+imageName); //4.通过路径得到file对象 File file = new File(filePath); //5.判断file对象是否存在，并且是一个标准文件 if (!file.exists()||!file.isFile()) { return; } //6.截取图片名称，得到图片后缀 String pic = imageName.substring(imageName.lastIndexOf(".")+1,imageName.length()); //判断是否为空 if(StringUtil.isEmpty(pic)){ return; } //7.根据不同后缀，设置对象的响应MIME类型 if ("gif".equals(pic.toLowerCase())) { response.setContentType("image/gif"); }else if("png".equals(pic.toLowerCase())){ response.setContentType("image/png"); }else if("jpg".equals(pic.toLowerCase())){ response.setContentType("image/jpeg"); } //8.利用commons-io的jar包，拷贝file对象 FileUtil.copyFile(file,response,getOutputStream()); FileUtils.copyFile(file, response.getOutputStream()); }