3
我在Spring Webflow/JSF應用程序中執行流操作（http://docs.spring.io/autorepo/docs/webflow/2.3.x/reference/html/actions.html#streaming-actions）時遇到問題。我已經看到有些人使用MVC控制器來解決它，但我想按如下方式使用它。Spring Webflow流
我使用的是Tomcat 7.01，Spring WebFlow 2.3.1和Primefaces 4.0。
問題是，當我想下載一個文件時，沒有任何反應。代碼被執行，但瀏覽器中沒有任何反應。有誰知道什麼可能是錯的，也許一些其他設置在一些XML，...？
非常感謝！
我的行動看起來像：
@Component
public class PrintCSVAction extends AbstractAction {
private static final String CSV_FILENAME = "export.csv";
public Event doExecute(RequestContext context) throws IOException {
HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getNativeResponse();
response.setHeader("Content-Disposition", "attachment; filename=\"" + CSV_FILENAME + "\"");
OutputStream out = response.getOutputStream();
response.setContentType("text/csv; charset=UTF-8");
out.write(new String("blablablab\n").getBytes("utf-8"));
out.flush();
out.close();
context.getExternalContext().recordResponseComplete();
return success();
}
}
視圖狀態在我的轉換定義是這樣的：
<view-state id="search" view="export.xhtml">
<transition on="home" to="finish" />
<transition on="printCSV">
<evaluate expression="printCSVAction" />
</transition>
</view-state>
而且commandlink爲執行動作：
<p:commandLink action="printCSV">
<p:graphicImage value="/css/images/csv.png" />
</p:commandLink>
而服務器在單擊命令鏈接後輸出以下日誌：
FlowHandlerMapping:108 - Mapping request with URI '/app/account' to flow with id 'account'
FlowExecutorImpl:161 - Resuming flow execution with key 'e2s2
SessionBindingConversationManager:67 - Locking conversation 2
DefaultFlowExecutionRepository:106 - Getting flow execution with key 'e2s2'
FlowDefinitionRegistryImpl:59 - Getting FlowDefinition with id 'account'
FlowDefinitionRegistryImpl:59 - Getting FlowDefinition with id 'export'
ConditionalFlowExecutionListenerLoader:87 - Loaded [3] of possible 3 listeners for this execution request for flow 'account', the listeners to attach are list[o[email protected]fc6c341, org.[email protected]242bb032, org[email protected]5c30045e]
FlowExecutionImpl:249 - Resuming in [email protected]0ee
ViewState:230 - Event 'printCSV' returned from view [JSFView = '/WEB-INF/flows/export/export.xhtml']
ActionExecutor:49 - Executing [[email protected] expression = printCSVAction, resultExpression = [null]]
AnnotatedAction:142 - Putting action execution attributes map[[empty]]
ActionExecutor:49 - Executing [email protected]
ActionExecutor:53 - Finished executing [email protected]; result = success
AnnotatedAction:149 - Clearing action execution attributes map[[empty]]
ActionExecutor:53 - Finished executing [[email protected] expression = printCSVAction, resultExpression = [null]]; result = success
Transition:213 - Executing [[email protected] on = printCSV, to = [null]]
DefaultFlowExecutionRepository:121 - Putting flow execution '[[email protected] flow = 'account', flowSessions = list[[[email protected] flow = 'account', state = 'export', scope = map['uiUtils' -> [email protected], 'user' -> [email protected]]], [[email protected] flow = 'export', state = 'search', scope = map['viewScope' -> map['flowSerializedViewState' -> [[email protected] viewId = '/WEB-INF/flows/export/export.xhtml']]]]]]' into repository
DefaultFlowExecutionRepository:128 - Adding snapshot to group with id 2
SessionBindingConversationManager:78 - Putting conversation attribute 'scope' with value map['flashScope' -> map['messagesMemento' -> map[[empty]]]]
SessionBindingConversationManager:99 - Unlocking conversation 2