方法完成过程后更改Primefaces命令按钮的禁用状态

分类：编程问答

如何解决方法完成过程后更改Primefaces命令按钮的禁用状态

我有一个页面，其中

用于开始搜索。搜索完成后，它将刷新<p:gmap>和dataTable。同时，我创建一个包含搜索详细信息的文本文件。我想在页面末尾为此文件创建一个下载按钮。

但是，生成文件需要时间。如果用户在该过程完成之前单击该按钮，则将收到HTTP 404错误。我试图仅在创建文件时启用“下载”按钮，但是我不知道仅在文件完成后如何将下载按钮中的Disabled属性从true切换为false。有可能吗？

我已经尝试过描述here的解决方案，但是没有用。

网页 

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition template="template.xhtml"
                xmlns="http://www.w3.org/1999/xhtml"
                xmlns:p="http://primefaces.org/ui"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:ui="http://java.sun.com/jsf/facelets">  


    <ui:define name="menuDireito"> 
        <f:view transient="true">
            <script src="https://maps.google.com/maps/api/js?sensor=false"></script>         
            <h:form id="form"> 
                <br></br>                                
                <p:selectOneMenu  immediate="true" value="#{circlesView.selectedCategory}"  converter="categoriaConverter" panelStyle="width:150px"  
                                  effect="fade" var="p" style="width:200px"  filter="true" filterMatchMode="startsWith">  
                    <f:selectItem itemLabel="Selecione o Estabelecimento" itemValue="" />  
                    <f:selectItems value="#{autoCompleteCategoria.categories}" var="category" itemLabel="#{category}" itemValue="#{category}"/>                                   

                    <p:column>  
                        #{p}  
                    </p:column>  

                </p:selectOneMenu>                                 

                <br></br><br></br>           
                <div style="text-align: left">Indique a área de busca:</div>
                <p:inputText id="range" value="#{circlesView.range}" /> 
                <p:watermark for="range" value="Ex: 1000" id="watermark" />

                <br></br><br></br>                   

                <div style="text-align: center">
                    <p:commandButton icon="fa fa-fw fa-search" style="width:150px !important; height: 30px !important;" ajax="false" process="@all" value="Pesquisar" action="#{circlesView.filteredQuery()}" update="dataTable" oncomplete="PF('dlg').show()" />             
                </div>

                <br></br><br></br> 

                <p:separator style="margin-bottom:10px"/>

                <p:gmap id="gmap" center="-23.5569834,-46.6362086" zoom="13" type="HYBRID" style="width:100%;height:400px" model="#{circlesView.circleModel}">                
                </p:gmap>

                <p:separator style="margin-bottom:10px"/>                                         

                <h3>Resultados</h3>  
                <p:dataTable id="basicDT" var="obj" value="#{circlesView.objs}">
                    <f:facet name="header">
                        Locais com infectados na vizinhança
                    </f:facet>
                    <p:column style="text-align: center" headerText="Nome">
                        <h:outputText value="#{obj.name}" />
                    </p:column>
                    <p:column style="text-align: center" headerText="# pessoas">
                        <h:outputText value="#{obj.score}" />
                    </p:column>               
                    <p:column style="text-align: center" headerText="Visualizar">
                        <p:commandButton update=":form:localDetail" oncomplete="PF('mapDialog').show()" icon="ui-icon-search" title="View">
                            <f:setPropertyActionListener value="#{obj}" target="#{circlesView.selectedObj}" />
                        </p:commandButton>                                       
                    </p:column>
                    <p:column style="text-align: center" headerText="Visualizar">
                        <p:commandButton update=":form:nDetail" oncomplete="PF('ndialog').show()" icon="ui-icon-search" title="View">
                            <f:setPropertyActionListener value="#{obj}" target="#{circlesView.selectedObj}" />
                        </p:commandButton>
                    </p:column>  
                </p:dataTable>  

                <p:dialog header="Local Position" widgetVar="mapDialog" modal="true" showEffect="fade" hideEffect="fade" resizable="false" width="625" height="400">

                    <p:outputPanel id="localDetail" style="text-align:center;">
                        <p:panelGrid  rendered="#{not empty circlesView.selectedObj}" >
                            <p:gmap id="gmap2" center="#{circlesView.selectedObj.coordPattern}" zoom="14" type="HYBRID" style="width:100%;height:400px" model="#{circlesView.selectedObj.mapModel}"/>
                        </p:panelGrid>         
                    </p:outputPanel>
                </p:dialog> 

                <p:dialog header="Neighborhood Info" widgetVar="nDialog" modal="true" showEffect="fade" hideEffect="fade" resizable="false">
                    <p:outputPanel id="nDetail" style="text-align:center;">
                        <p:panelGrid  columns="2" rendered="#{not empty dtSelectionView.selectedCar}" columnClasses="label,value">                

                            <h:outputText value="Id:" />
                            <h:outputText value="#{circlesView.selectedObj.id}" />

                            <h:outputText value="Dist" />
                            <h:outputText value="#{circlesView.selectedObj.distancia}" />
                        </p:panelGrid>
                    </p:outputPanel>
                </p:dialog>

            </h:form>
            <br></br>

            <h:form id="downloadForm">
                <p:commandButton action="#{circlesView.downloadAction()}" value="Download" ajax="false" icon="fa fa-fw fa-download" disabled="#{circlesView.disable}">
                    <p:fileDownload value="#{circlesView.file}" />
                </p:commandButton>                  
            </h:form>

        </f:view>
    </ui:define>        

</ui:composition>

Bean 

@ManagedBean(name = "circlesView")
@SessionScoped
public class PreferenceQuery implements Serializable {

    private MapModel circleModel;
    private String path;
    private String contentType;
    private boolean disable;
    Integer range;
    Properties properties;
    DefaultStatisticCenter statistics;
    Integer k = 20;
    List<ScoredObjectMarked> objs;
    ScoredObjectMarked selectedObj;
    String selectedCategory;
    private static final long serialVersionUID = 1L;

    public PreferenceQuery() {
        disable = true;
    }

    public List<ScoredObjectMarked> query() throws FileNotFoundException,UnsupportedEncodingException,IOException {

        disable = true;
        objs = new ArrayList<ScoredObjectMarked>();
        statistics = new DefaultStatisticCenter();

        try {
            properties = Settings.myLoadProperties(new File("D:\\Documents\\GitHub\\COVID-Geo-Monitoring\\web\\search.properties"));
        } catch (IOException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,null,ex);
        }

        //Converte para radius
        double radius = (180 * range) / (6378137.0 * Math.PI);

        PreferenceFileTermManager fileTermManager = createPreferenceFileTermManager();

        PreferenceTreeTermManager treeTermManager = createPreferenceTreeTermManager();

        PreferenceIndex prefIndex = createPreferenceSpatialInvertedIndex(fileTermManager,treeTermManager,false);

        StarRTree rTree = null;
        try {
            rTree = createRtree(null);
        } catch (IOException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        }

        try {
            prefIndex.open();
        } catch (SSEExeption ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        } catch (ColumnFileException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        } catch (IOException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        }

        PreferenceSearch experiment = new PreferenceSearch(statistics,false,prefIndex.getTermVocabulary(),1,k,0.5 /*alfa*/,Double.parseDouble(properties.getProperty("dataset.spaceMaxValue")),selectedCategory,prefIndex,rTree,3,true,radius);

        try {
            experiment.open();
        } catch (ExperimentException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        }

        Iterator<SpatioTextualObject> result = null;
        try {
            result = experiment.search("patient",20);
        } catch (ExperimentException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        }

        while (result.hasNext()) {
            ScoredObject p = (ScoredObject) result.next();
            ScoredObjectMarked p_model = new ScoredObjectMarked(p.getId(),p.getLatitude(),p.getLongitude(),range,p.getMessage());
            p_model.setScore(p.getScore());
            objs.add(p_model);
        }

        try {
            experiment.close();
        } catch (ExperimentException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,ex);
        }

        circleModel = new DefaultMapModel();

        for (int a = 0; a < objs.size() && a < k; a++) {

            ScoredObject poi = objs.get(a);

            LatLng coords = new LatLng(poi.getLatitude(),poi.getLongitude());

            Circle circle = new Circle(coords,range);
            circle.setStrokeColor("#d93c3c");
            circle.setFillColor("#d93c3c");
            circle.setFillOpacity(0.5);

            circleModel.addOverlay(circle);
        }

        reportFeatures();
        disable = false;
        return objs;
    }

    public void downloadAction() {
        path = "D:\\Documents\\GitHub\\COVID-Geo-Monitoring\\src\\java\\query\\fullReport.txt";
        contentType = FacesContext.getCurrentInstance().getExternalContext().getMimeType(path);
    }

    public StreamedContent getFile() throws FileNotFoundException {
        return new DefaultStreamedContent(new FileInputStream("D:\\Documents\\GitHub\\COVID-Geo-Monitoring\\src\\java\\query\\fullReport.txt"),contentType,"Report.txt");
    }

    public void reportFeatures() throws FileNotFoundException,IOException {

        Writer output = new OutputStreamWriter(new FileOutputStream("D:\\Documents\\GitHub\\COVID-Geo-Monitoring\\src\\java\\query\\fullReport.txt",false),"ISO-8859-1");

        for (ScoredObjectMarked poi : objs) {

            output.write("Pacientes próximos ao " + poi.getName() + "\n\n");

            SpatioItemCollection collection = poi.getNN();
            Iterator colIt = collection.iterator();

            while (colIt.hasNext()) {
                SpatioItem paciente = (SpatioItem) colIt.next();
                output.write("\t Paciente " + paciente.getId() + ": (" + paciente.getLatitude() + "," + paciente.getLongitude() + ") "
                        + "Distância para o Hospital: " + paciente.getDistancia() + "\n");
            }
            output.write("\n");
            output.flush();
        }
        output.close();
    }

    public List<ScoredObjectMarked> filteredQuery() throws IOException,FileNotFoundException,ClassNotFoundException,SSEExeption,ColumnFileException {

        objs = new ArrayList<ScoredObjectMarked>();
        statistics = new DefaultStatisticCenter();

        try {
            properties = Settings.myLoadProperties(new File("D:\\Documents\\GitHub\\COVID-Geo-Monitoring\\web\\search.properties"));
        } catch (IOException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,false);

        StarRTree rTree = createRtree(selectedCategory);

        prefIndex.open();

        PreferenceSearch experiment = new PreferenceSearch(statistics,k);
        } catch (ExperimentException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,p.getMessage());
            p_model.setScore(p.getScore());
            p_model.setNN(p.getNN());
            objs.add(p_model);
        }

        try {
            experiment.close();
        } catch (ExperimentException ex) {
            Logger.getLogger(PreferenceQuery.class.getName()).log(Level.SEVERE,range);
            circle.setStrokeColor("#d93c3c");
            circle.setFillColor("#d93c3c");
            circle.setFillOpacity(0.5);

            circleModel.addOverlay(circle);
        }

        reportFeatures();
        disable = false;

        return objs;
    }

    public boolean getDisable() {
        return disable;
    }

    public void setDisable(boolean disable) {
        this.disable = disable;
    }

    public List<ScoredObjectMarked> getObjs() {
        return objs;
    }

    public void setObjs(List<ScoredObjectMarked> objs) {
        this.objs = objs;
    }

    public MapModel getCircleModel() {
        return circleModel;
    }

    public void onCircleSelect(OverlaySelectEvent event) {
        FacesContext.getCurrentInstance().addMessage(null,new FacesMessage(FacesMessage.SEVERITY_INFO,"Circle Selected",null));
    }

    public Integer getRange() {
        return range;
    }

    public void setRange(Integer range) {
        this.range = range;
    }

    public ScoredObject getSelectedObj() {
        return selectedObj;
    }

    public void setSelectedObj(ScoredObjectMarked selectedObj) {
        this.selectedObj = selectedObj;
    }

    public String getSelectedCategory() {
        return selectedCategory;
    }

    public void setSelectedCategory(String selectedCategory) {
        this.selectedCategory = selectedCategory;
    }

    private StarRTree createRtree(String poi) throws FileNotFoundException,IOException,ClassNotFoundException {

        if (poi == null) {
            poi = "Sao Paulo";
            selectedCategory = "Sao Paulo";
        }

        Path path = Paths.get(properties.getProperty("experiment.folder") + "\\rtrees\\" + selectedCategory);
        Files.createDirectories(path);

        StarRTree rTree = new StarRTree(statistics,"",properties.getProperty("experiment.folder") + "\\rtrees\\" + selectedCategory + "\\rtree",Integer.parseInt(properties.getProperty("srtree.dimensions")),Integer.parseInt(properties.getProperty("srtree.cacheSize")),Integer.parseInt(properties.getProperty("disk.blockSize")),Integer.parseInt(properties.getProperty("srtree.minNodeCapacity")),Integer.parseInt(properties.getProperty("srtree.maxNodeCapacity")));

        System.out.println("POI: " + poi);
        LoadRTree.load(rTree,"D:\\Documents\\GitHub\\COVID-Geo-Monitoring\\web\\Categorias\\" + poi + ".txt");

        return rTree;
    }

    private PreferenceIndex createPreferenceSpatialInvertedIndex(PreferenceFileTermManager fileTermManager,PreferenceTreeTermManager treeTermManager,boolean constructionTime) {
        return new PreferenceIndex(statistics,properties.getProperty("experiment.folder"),100,fileTermManager,constructionTime);
    }

    private PreferenceTreeTermManager createPreferenceTreeTermManager() {
        return new PreferenceTreeTermManager(statistics,Integer.parseInt(properties.getProperty("srtree.maxNodeCapacity")),100);
    }

    private PreferenceFileTermManager createPreferenceFileTermManager() {
        return new PreferenceFileTermManager(statistics,properties.getProperty("experiment.folder") + "/s2i",Integer.parseInt(properties.getProperty("srtree.cacheSize")));
    }
}

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