在jsf中运行时显示警报消息

在以下代码中，支票金额小于（质量*费率），然后显示警告消息。 XHTML代码：

<p:dialog id="invoiceDialog" header="Add Invoice"
                widgetVar="addInvoice" minHeight="40" showEffect="explode"
                hideEffect="fold">
                <table border="1" id="dialogTable">
                    <tr>
                        <td><p:outputLabel value="Description Of Goods Or Services" /></td>
                        <td><p:outputLabel value="HSN Code" /></td>
                        <td><p:outputLabel value="Quantity" /></td>
                        <td><p:outputLabel value="Rate" /></td>
                        <td><p:outputLabel value="Percentage Discount" /></td>
                    </tr>
                    <tr>
                        <td><p:inputText id="description"
                                value="#{invoiceBean.descriptionOfGoodsOrService}" cols="45"
                                required="true" label="Description"
                                requiredMessage="Description Require Entry"
                                disabled="#{invoiceBean.descriptionOfGoodsOrService != null}" /></td>

                        <td><p:inputText value="#{invoiceBean.hsnCode}" size="6" /></td>

                        <td><p:inputText id="quaintity"
                                value="#{invoiceBean.quantity}" size="3" styleClass="Alingment"
                                required="true" label="Quantity"
                                requiredMessage="Quantity Require Entry" autocomplete="off" /></td>

                        <td><p:inputText id="rate" value="#{invoiceBean.rate}"
                                styleClass="Alingment" required="true" label="Rate"
                                requiredMessage="Rate Require Entry" autocomplete="off" /></td>

                        <td><p:inputText value="#{invoiceBean.percentDiscount}"
                                size="2" styleClass="Alingment" autocomplete="off" /></td>
                    </tr>
                </table>

                <h:panelGroup id="mode">
                    <p:panelGrid columns="2">
                        <p:panelGrid columns="2">
                            <p:outputLabel style="font-weight: bold;"
                                value="Mode Of Payments" />
                            <p:selectOneRadio value="#{invoiceBean.modeOfPayment}"
                                layout="pageDirection">
                                <f:ajax render="mode" />
                                <f:selectItem itemLabel="Cash" itemValue="Cash" />
                                <f:selectItem itemLabel="Cheque" itemValue="Cheque" />
                            </p:selectOneRadio>
                            <p:outputLabel value="Enter Bank Name :" />
                            <p:inputText value="#{invoiceBean.bankName}"
                                disabled="#{invoiceBean.modeOfPayment == 'Cash'}" />
                            <p:outputLabel value="Enter Cheque Number :" />
                            <p:inputText value="#{invoiceBean.chequeNumber}"
                                disabled="#{invoiceBean.modeOfPayment == 'Cash'}" />
                            <p:outputLabel value="Total is :" />
                            <p:inputText value="#{invoiceBean.chequeAmount}" />
                        </p:panelGrid>
                        <p:panelGrid columns="1">
                            <p:dataTable value="#{invoiceBean.transactions}"
                                var="transaction">
                                <p:column headerText="Mode Of Payment">
                                    <p:outputLabel value="#{transaction.modeOfPayment}" />
                                </p:column>
                                <p:column headerText="Bank Name">
                                    <p:outputLabel value="#{transaction.bankName}" />
                                </p:column>
                                <p:column headerText="Amount">
                                    <p:outputLabel value="#{transaction.chequeAmount}" />
                                </p:column>
                                <p:column headerText="Balance">
                                    <p:outputLabel value="#{transaction.balance}" />
                                </p:column>
                                <p:summaryRow>
                                    <p:column colspan="3">
                                        <p:outputLabel value="Remaining Balance" />
                                    </p:column>
                                    <p:column>
                                        <p:outputLabel value="#{transaction.balance}" />
                                    </p:column>
                                </p:summaryRow>
                            </p:dataTable>
                        </p:panelGrid>
                    </p:panelGrid>
                </h:panelGroup>
                <p:commandButton value="Save New Invoice"
                    action="#{invoiceBean.addRow}" update=":form:invoiceTable growl"
                    process="@form invoiceTable" onclick="PF('addInvoice').hide();">
                    <f:ajax render=":form:invoiceTable" />
                </p:commandButton>
                <p:growl id="growl" showDetail="true" sticky="true" />
            </p:dialog>

以下托管bean代码用于存储事务相关数据：

 public void addRow() {

    int lastBalance, currentBalance, storeBalance;
    transaction = new Transaction();
    invoiceProductsServicesDetail = new InvoiceProductsServicesDetail();
    invoiceDao = new InvoiceDao();
    transactionDao = new TransactionDao();
    FacesContext facesContext = FacesContext.getCurrentInstance();
    DataTable dataTable = (DataTable) facesContext.getViewRoot().findComponent("form:invoiceTable");
    UIComponent uiTable = ComponentUtils.findParentForm(facesContext,dataTable);
    final AjaxBehavior behavior = new AjaxBehavior();

    try {
        amount = (rate * quantity);
        if(chequeAmount <= amount){
            transactions = transactionDao.getTransactions(invoices.get(0).getId());
            if (transactions.size() != 0) {
                setTransactions(transactions);
                lastBalance = transactions.get(transactions.size() - 1).getBalance();
            } else {
                lastBalance = 0;
            }
            currentBalance = chequeAmount - amount;
            storeBalance = lastBalance + currentBalance;
            transaction.setModeOfPayment(modeOfPayment);
            if (modeOfPayment.equals("Cheque")) {
                transaction.setBankName(bankName);
                transaction.setChequeNumber(chequeNumber);
                transaction.setBalance(storeBalance);
            } else {
                transaction.setBalance(storeBalance);
            }
            transaction.setChequeAmount(chequeAmount);
            transaction.setReceiptNumber(String.valueOf(new Date().getTime()));
            transactionDao.setTransaction(transaction, invoices.get(0).getId());
            this.transactions = transactionDao.getTransactions(invoices.get(0).getId());
            RowEditEvent rowEditEvent = new RowEditEvent(uiTable, behavior, invoiceProductsServicesDetail);
            rowEditEvent.setPhaseId(PhaseId.UPDATE_MODEL_VALUES);
            dataTable.broadcast(rowEditEvent);
        }else{
            //Diplay Alert Message that "Producats/Services total amount Must greater than your cheque amount"
        }
    }
    } catch (AbortProcessingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 
} 

public void addRow（）{
int lastBalance、currentBalance、storeBalance；
事务=新事务（）；
invoiceProductsServicesDetail=新的invoiceProductsServicesDetail（）；
invoiceDao=新的invoiceDao（）；
transactionDao=新的transactionDao（）；
FacesContext FacesContext=FacesContext.getCurrentInstance（）；
DataTable DataTable=（DataTable）facesContext.getViewRoot（）.findComponent（“表单：invoiceTable”）；
UIComponent uiTable=ComponentUtils.findParentForm（facesContext，dataTable）；
最终AjaxBehavior=新的AjaxBehavior（）；
试一试{
金额=（费率*数量）；
如果（支票金额放入其他部分

FacesMessage facesMessage = new FacesMessage();
facesMessage.setSeverity(FacesMessage.SEVERITY_ERROR);      
facesMessage.setDetail("Producats/Services total amount Must greater than your cheque amount");
FacesContext.getCurrentInstance().addMessage(null, facesMessage);
return null; 

很抱歉，我的代码太长了。我知道。这就是我发布该链接的原因。它详细解释了如何为问题中的代码创建适当的代码段。一种方法是将当前代码保存在版本控制中，然后删除尽可能多的行，只要问题仍然存在。