SJC

在controller里使用render(字符串)时，一直报这个错，不知道是哪里用错了 `java.lang.AbstractMethodError: net.csdn.modules.http.DefaultResponse.originContent(Ljava/lang/String;)Lnet/csdn/modules/http/RestResponse;` `at net.csdn.modules.http.ApplicationController.render(ApplicationController.java:121) at streaming.rest.RestController.deleteParam(RestController.scala:111) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at net.csdn.modules.http.RestController.filter(RestController.java:139) at net.csdn.modules.http.RestController.dispatchRequest(RestController.java:99) at net.csdn.modules.http.HttpServer$DefaultHandler.handle(HttpServer.java:184) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)...

请问有没有提供文件下载的功能呢？像play那种