Flex中mx:Image组件动态调用Tomcat工程以外图片的方法

<mx:Image source="@Embed('C:/test.PNG')" />

但是很快发现，Embed标签是在编译期就把图片加载进swf文件中的，无法实现动态更换图片的功能。

解决的办法是:

新建一个Servlet来实现图片读取。

ImageShowServlet.java

public class ImageShowServlet extends HttpServlet {

?private static final long serialVersionUID = -3481832826439542244L;

?@Override
?protected void doGet(HttpServletRequest req, HttpServletResponse resp)
???throws ServletException, IOException {
??
??processRequest(req, resp);
?}

?@Override
?protected void doPost(HttpServletRequest req, HttpServletResponse resp)
???throws ServletException, IOException {
??
??processRequest(req, resp);
?}

?protected void processRequest(HttpServletRequest request,
???HttpServletResponse response) throws ServletException, IOException {
??
??String imgName = request.getParameter("imagename");
??ResourceBundle resourceBundel = ResourceBundle.getBundle("application");
??String imgPath = resourceBundel.getString("img_root");
??
????? ?File imgFile = new File(imgPath + imgName);
????? ?if(imgFile.exists()) {
????? ??
????? ??response.reset();
????????? ?response.setContentType("application/octet-stream");
????????? ?response.setCharacterEncoding("utf-8");
????????? ?response.setHeader("Content-disposition", "filename=" + imgName);
????????? ?
????? ??InputStream is = new FileInputStream(imgFile);
????????? ?OutputStream outputStream = response.getOutputStream();
????????? ?int data = -1;?
????????? ?while((data = is.read()) != -1) {
????????? ??outputStream.write(data);?
????????? ?}
????????? ?outputStream.flush();
????????? ?outputStream.close();
????? ?}
?}
}

Flex通过访问这个Servlet来实现图片加载：

var imgName : String = "test.PNG";
var imgUrl : String = "./imageshow?imagename=" + imgName;
imgroot.source = imgUrl; //imgroot.load(imgUrl);也可以