@Override
public void init(FilterConfig config) throws ServletException {
application = config.getServletContext();
String loadPath = Thread.currentThread().getContextClassLoader().getResource("").getPath();
String classPath = loadPath.substring(1, loadPath.length());
ArrayList<String> actions = XMLReader.getNodeValues(classPath + "unicorn-config.xml", "actions");
this.initActions(actions);
ArrayList<String> routers = XMLReader.getNodeValues(classPath + "unicorn-config.xml", "routers");
this.initRouters(routers);
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
String path = request.getContextPath();
String uri = request.getRequestURI();
String relativeUri = uri.substring(path.length(), uri.length());
this.request = request;
this.session = request.getSession();
this.response = (HttpServletResponse) servletResponse;
// 用戶自定義的Router優先級最高，url先通過用戶定義的
Iterator<IPathRouter> iterator = routerList.iterator();
while(iterator.hasNext()) {
IPathRouter router = iterator.next();
if(router.route(relativeUri, this)) {
return ;
}
}
// 攔截不到的繼續訪問
filterChain.doFilter(servletRequest, servletResponse);
}
private void initRouters(ArrayList<String> routers) {
routerList = new ArrayList<IPathRouter>();
for (int i = 0; i < routers.size(); i++) {
String routerName = routers.get(i);
try {
Class<?> clz = Class.forName(routers.get(i));
// 單例模式通過方法獲取對象實例
IPathRouter router = (IPathRouter) clz.newInstance();
routerList.add(router);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}
}
// 最后把框架默認的Router加入進來
routerList.add(new AMPPathRouter());
}
<?xml version="1.0" encoding="UTF-8" ?>
<config>
<routers>
<router class="com.mh.router.MySessionCheckRouter"></router>
</routers>
<actions>
<action class="com.mh.action.UserAction"></action>
<action class="com.mh.action.InformationAction"></action>
<action class="com.mh.action.UploadInformationIconAction"></action>
<action class="com.mh.action.TempPicAction"></action>
<action class="com.mh.action.MobileAction"></action>
</actions>
</config>
這里即定義了Action，也定義了自己的Router，并且從名稱上可以看出，這個SessionCheckRouter是要判斷所有提交到服務器的指定url的請求 是否已經登錄過，沒有登錄，可能會把此請求遣送會登錄頁。以及初始化所有的Action，在Router處理完請求，分發給action時，可以從filter里面去取。