如何在轉換器上使用Prettyfaces？

Question

我使用的是蠻力3.3.2和JSF 2.2.1。我想將漂亮的url字符串轉換爲實體對象並在網頁中使用該對象。漂亮-config.xml中：

<url-mapping id="country"> 
    <pattern value="/country/#{countryBean.selectedCountry}"> 
     <convert param="#{countryBean.selectedCountry}" converterId="countryConverter" converterClass="Test.CountryBean" /> 
    </pattern> 
    <view-id value="/faces/countries/country.xhtml" /> 
</url-mapping> 

country.xhtml：

<f:metadata> 
    <f:viewParam name="country" value="#{countryBean.selectedCountry}"> 
     <f:converter converterId="countryConverter" /> 
    </f:viewParam> 
</f:metadata> 
<ui:define name="content"> 
    #{countryBean.selectedCountry.country} 
</ui:define> 

CountryConverter：

public static EntityCountry country = new EntityCountry(); 

EntityManagerFactory emf = Persistence.createEntityManagerFactory("testPU"); 

public EntityCountry getAsObject(FacesContext context, UIComponent component, String value) { 
    EntityManager em = emf.createEntityManager(); 

    Query query = em.createQuery("SELECT c FROM EntityCountry c WHERE c.url = :countryUrl") 
      .setParameter("countryUrl", value); 
    country = (EntityCountry) query.getSingleResult(); 
    return country; 
} 

public String getAsString(FacesContext context, UIComponent component, Object value) { 
    EntityCountry c = (EntityCountry) value; 
    return c.getUrl(); 
} 

我切換斷點的getAsObject方法，但它並沒有命中斷點。 faces-config.xml中：

<converter> 
    <converter-id>countryConverter</converter-id> 
    <converter-class>Test.CountryConverter</converter-class> 
</converter> 
<managed-bean> 
    <managed-bean-name>countryBean</managed-bean-name> 
    <managed-bean-class>Test.CountryBean</managed-bean-class> 
    <managed-bean-scope>session</managed-bean-scope> 
</managed-bean> 

CountryBean：

@Named("countryBean") 
@SessionScoped 
public class CountryBean implements Serializable { 
    private EntityCountry selectedCountry; 

    public EntityCountry getSelectedCountry() { return selectedCountry; } 
    public void setSelectedCountry(EntityCountry newValue) { selectedCountry = newValue; } 
} 

和錯誤：

PrettyFaces: Exception occurred while processing <country:#{countryBean.selectedCountry}> for URL </country/turkiye> 
- Stack Trace 
com.ocpsoft.pretty.PrettyException: PrettyFaces: Exception occurred while processing <country:#{countryBean.selectedCountry}> for URL 

</country/turkiye> 
    at com.ocpsoft.pretty.faces.beans.ParameterInjector.injectPathParams(ParameterInjector.java:96) 
    at com.ocpsoft.pretty.faces.beans.ParameterInjector.injectParameters(ParameterInjector.java:54) 
    at com.ocpsoft.pretty.faces.event.PrettyPhaseListener.afterPhase(PrettyPhaseListener.java:98) 
    at com.sun.faces.lifecycle.Phase.handleAfterPhase(Phase.java:189) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:107) 
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) 
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217) 
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217) 
    at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:785) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483) 
    at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454) 
    at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300) 
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:110) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) 
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98) 
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162) 
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174) 
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828) 
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725) 
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019) 
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225) 
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) 
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) 
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) 
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) 
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) 
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) 
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71) 
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) 
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) 
    at java.lang.Thread.run(Thread.java:722) 
Caused by: javax.el.ELException: java.lang.IllegalArgumentException: Cannot convert turkiye of type class 

java.lang.String to class Test.EntityCountry 
    at com.sun.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:68) 
    at org.jboss.weld.util.el.ForwardingExpressionFactory.coerceToType(ForwardingExpressionFactory.java:37) 
    at com.ocpsoft.pretty.faces.util.FacesElUtils.setValue(FacesElUtils.java:86) 
    at com.ocpsoft.pretty.faces.beans.ParameterInjector.injectPathParams(ParameterInjector.java:90) 
    ... 46 more 
Caused by: java.lang.IllegalArgumentException: Cannot convert turkiye of type class java.lang.String to 

class Test.EntityCountry 
    at com.sun.el.lang.ELSupport.coerceToType(ELSupport.java:397) 
    at com.sun.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:66) 
    ... 49 more 

Answer 1

看起來你同時使用PrettyFaces注入和ViewParams。如果你正在使用ViewParams，你應該從PrettyFaces使用命名參數而不是參數注入，像這樣：

<url-mapping id="country"> 
    <pattern value="/country/#{country}" /> 
    <view-id value="/faces/countries/country.xhtml" /> 
</url-mapping> 

然後，你可以讓JSF做轉換價值的工作，因爲你問它這樣做英寸