我正在开发一个在给定时刻使用Spring Web Flow的Web。在流程中,有一点(flow2.jsp),用户被要求从某些复选框中选择。我见过的所有的例子(如this和this)获取的项目来满足从控制器类的复选框......但因为我使用Spring Web Flow的,我使用的是默认的流量控制器:Spring Web Flow中的复选框
<beans:bean id="flowcontroller" class="org.springframework.webflow.mvc.servlet.FlowController">
<beans:property name="flowExecutor" ref="flowExecutor"></beans:property>
</beans:bean>
如何我可以喂这些物品吗?我必须在JSP中硬编码它们吗?
谢谢。
编辑
最后我做了类似的事情,用我的模型对象初始化地图:
public Map referenceData(RequestContext context){
System.out.println("Setting up list");
Map referenceData=new HashMap();
list=new ArrayList<String>();
list.add("cb1");
list.add("cb2");
list.add("cb3");
referenceData.put("list", list);
return referenceData;
}
这种方法是从flow.xml叫:
<view-state id="flow2" view="flow2" model="proyecto">
<on-render>
<evaluate expression="proyecto.referenceData(flowRequestContext)"></evaluate>
</on-render>
<transition on="gotoPageThree" to="flow3"></transition>
<transition on="goBack" to="inicio"></transition>
</view-state>
flow2.jsp是视图的名称:
<form:checkboxes items="${list}" path="property-in-my-model"/>
这样,它抛出一个异常:
java.lang.IllegalArgumentException: 'items' must not be null
at org.springframework.util.Assert.notNull(Assert.java:112)
at org.springframework.web.servlet.tags.form.AbstractMultiCheckedElementTag.setItems(AbstractMultiCheckedElementTag.java:83)
at org.apache.jsp.WEB_002dINF.views.flow2_jsp._jspx_meth_form_005fcheckboxes_005f0(flow2_jsp.java:170)
at org.apache.jsp.WEB_002dINF.views.flow2_jsp._jspx_meth_form_005fform_005f0(flow2_jsp.java:135)
at org.apache.jsp.WEB_002dINF.views.flow2_jsp._jspService(flow2_jsp.java:81)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
at org.springframework.webflow.mvc.servlet.ServletMvcView.doRender(ServletMvcView.java:55)
at org.springframework.webflow.mvc.view.AbstractMvcView.render(AbstractMvcView.java:187)
at org.springframework.webflow.engine.ViewState.render(ViewState.java:296)
at org.springframework.webflow.engine.ViewState.refresh(ViewState.java:243)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:221)
at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
at org.springframework.webflow.mvc.servlet.FlowController.handleRequest(FlowController.java:174)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
我可以看到系统输出来之前在控制台不是例外,所以我的模型对象应该有一个准备使用列表...
我现在进不去的地方,我有我的项目的电脑,我会检查这个明天......但看起来不错。感谢Prasad。 – Fustigador
好吧,让我们知道它是否适合你。 – Prasad
请参阅编辑。 – Fustigador