如何引用List＆lt;＆gt;托管bean中的对象来自JSF xhtml页面？

时间：2016-08-30 22:43:51

标签： jsf jsf-2 primefaces

也许我不知道怎么问我的问题，这就是为什么我找不到答案。所以，我们走了。

我正在玩/测试一些东西，当我使用List＆lt;＆gt;时我感到难过在非托管bean中（或为此管理）。

我有一个名为PayrollSummaryWizard.java的java托管bean，用于primeFaces向导。在这个托管bean中，我有一个java类，它包含2个列表。一个持有一种佣金，另一个持有另一个。我将这些佣金设置为他们自己的java类。

package com.testing.xx.payrollsummary;

import java.io.Serializable;
import javax.inject.Named;
import javax.faces.view.ViewScoped;
import org.primefaces.event.FlowEvent;

@ViewScoped
@Named
public class PayrollSummaryWizard implements Serializable {

    private PayrollSummary payrollSummary = new PayrollSummary();

    public PayrollSummary getPayrollSummary() {
        return payrollSummary;
    }

    public void setPayrollSummary(PayrollSummary payrollSummary) {
        this.payrollSummary = payrollSummary;
    }

    private String onFlowProcess(FlowEvent event)
    {
        return event.getNewStep();
    }

    private void save()
    {

    }
}


package com.testing.xx.payrollsummary;

import java.io.Serializable;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class PayrollSummary implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private List<CountCommission> countCommissions;

    public List<CountCommission> getCountCommissions() {
        return carCommissions;
    }

    public void setCountCommissions(List<CountCommission> countCommissions) {
        this.countCommissions = countCommissions;
    }

    public List<SalesCommission> getSalesCommissions() {
        return salesCommissions;
    }

    public void setSalesCommissions(List<SalesCommission> salesCommissions) {
        this.salesCommissions = salesCommissions;
    }

    public Long getManagersEmployeeNumber() {
        return managersEmployeeNumber;
    }

    public void setManagersEmployeeNumber(Long managersEmployeeNumber) {
        this.managersEmployeeNumber = managersEmployeeNumber;
    }

    public String getStore() {
        return store;
    }

    public void setStore(String store) {
        this.store = store;
    }
    private List<SalesCommission> salesCommissions;
    private Long managersEmployeeNumber;
    private String store;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof PayrollSummary)) {
            return false;
        }
        PayrollSummary other = (PayrollSummary) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

}

package com.testing.xx.payrollsummary;

        import java.io.Serializable;
        import javax.persistence.Entity;
        import javax.persistence.GeneratedValue;
        import javax.persistence.GenerationType;
        import javax.persistence.Id;


        @Entity
        public class SalesCommission implements Serializable {

            private static final long serialVersionUID = 1L;
            @Id
            @GeneratedValue(strategy = GenerationType.AUTO)
            private Long id;
            private Double salesAmount;

            public Double getSalesAmount() {
                return salesAmount;
            }

            public void setSalesAmount(Double salesAmount) {
                this.salesAmount = salesAmount;
            }

            public Long getEmployeeNumber() {
                return employeeNumber;
            }

            public void setEmployeeNumber(Long employeeNumber) {
                this.employeeNumber = employeeNumber;
            }
            private Long employeeNumber;

            public Long getId() {
                return id;
            }

            public void setId(Long id) {
                this.id = id;
            }
    @Override
                public int hashCode() {
                    int hash = 0;
                    hash += (id != null ? id.hashCode() : 0);
                    return hash;
                }

                @Override
                public boolean equals(Object object) {
                    // TODO: Warning - this method won't work in the case the id fields are not set
                    if (!(object instanceof SalesCommission)) {
                        return false;
                    }
                    SalesCommission other = (SalesCommission) object;
                    if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
                        return false;
                    }
                    return true;
                }

            }

问题出现在xhtml

中 
<?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">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:p="http://primefaces.org/ui">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <h:form>
            <p:panelGrid>
                <p:wizard flowListener="#{payrollSummaryWizard.onFlowProcess}">
                    <p:tab id="personal" title="Personal">
                        <p:panel header="Personal Details">
                            <p:messages />
                            <h:panelGrid columns="2" columnClasses="label, value">
                                <h:outputLabel for="managersEmployeeNumber" value="Manager's Employee Number:" />
                                <p:inputText id="managersEmployeeNumber" value="#{payrollSummaryWizard.payrollSummary.managersEmployeeNumber}" required="true" label="Manager's Employee Number"/>

                                <h:outputLabel for="store" value="Store:" />
                                <p:inputText id="store" value="#{payrollSummaryWizard.payrollSummary.store}" required="true" label="Store"/>
                            </h:panelGrid>
                        </p:panel>
                    </p:tab>
                    <p:tab id="personal" title="Personal">
                        <p:panel header="Personal Details">
                            <p:messages />
                            <h:panelGrid columns="2" columnClasses="label, value">
                                <h:outputLabel for="salesCommission_employeeNumber" value="Employee Number:" />
                                <p:inputText id="salesCommission_employeeNumber" value="#{payrollSummaryWizard.payrollSummary.salesCommissions.??}" required="true" label="Employee Number"/>


                            </h:panelGrid>
                        </p:panel>
                    </p:tab>
                </p:wizard>
            </p:panelGrid>
        </h:form>
    </h:body>
</html>

如何访问该列表？

value="#{payrollSummaryWizard.payrollSummary.salesCommissions.??}"

在哪里??，我正在尝试做员工编号。尝试使用数组类型，但它看起来不会起作用吗？

编辑：我不确定这是否重要，但我之所以这样想是因为，在页面上有一个“添加”按钮会很好，动态新字段会出现在这里，它们可以是映射回列表，如果这是有道理的。通过这种方式，我可以在本周的1个表单上添加更多员工销售佣金。

我在这里发现了两个类似的问题，但他们并不是这样。这是一个因为我丢失了与另一个的链接：/

JSF - List of objects in a Managed Bean and memory management question

编辑：我不认为这应该被认为是一个重复的问题，因为，其他相似的问题提供了一个对此无效的答案。你得到的只是空引用。我已经尝试使用[0] .employeeNumber，因为我的想法是列表可以像数组一样访问，这里，即使使用@PostConstruct进行初始化，或者没有，它仍然会抛出空指针引用。其次，实际列表不存储在@ManagedBean中，它位于托管bean引用的POJO中。

对不起我是如此散乱，就像我说的，我不知道如何提出这个问题。

所以，这是我目前尝试过的代码：

package com.testing.xx.payrollsummary;

import java.io.Serializable;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.SessionScoped;
import javax.faces.bean.ViewScoped;
import org.primefaces.event.FlowEvent;

/**
 *
 * @author cfranklin
 */
@SessionScoped
@ManagedBean
public class PayrollSummaryWizard implements Serializable {
    private PayrollSummary payrollSummary = new PayrollSummary();
    @PostConstruct
    public void init() {
        payrollSummary = new PayrollSummary();
    }
    public PayrollSummary getPayrollSummary() {
        return payrollSummary;
    }

    public void setPayrollSummary(PayrollSummary payrollSummary) {
        this.payrollSummary = payrollSummary;
    }

    public String onFlowProcess(FlowEvent event) {
        return event.getNewStep();
    }

    private void save() {

    }
}

在这个@ManagedBean中，我尝试了所有不同的范围，没有工作。第二，在过去，当我想用​​@PostConstruct填充数组传递给dropdwon时，由于某种原因，范围很重要，这就是为什么我现在尝试了所有这些。

@ManagedBean引用的POJO是这样的：

package com.testing.xx.payrollsummary;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

@Entity
public class PayrollSummary implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @OneToMany
    private List<CountCommission> countCommissions = new ArrayList();
    @OneToMany
    private List<SalesCommission> salesCommissions = new ArrayList();
    private Long managersEmployeeNumber;
    private String store;
    private static final long serialVersionUID = 1L;

    public void PayrollSummary(){
         salesCommissions = new ArrayList();
         carCommissions = new ArrayList();
    }

    public List<CountCommission> getCountCommissions() {
        return countCommissions;
    }

    public void setCountCommissions(List<CountCommission> countCommissions) {
        this.countCommissions = countCommissions;
    }

    public List<SalesCommission> getSalesCommissions() {
        return salesCommissions;
    }

    public void setSalesCommissions(List<SalesCommission> salesCommissions) {
        this.salesCommissions = salesCommissions;
    }

    public Long getManagersEmployeeNumber() {
        return managersEmployeeNumber;
    }

    public void setManagersEmployeeNumber(Long managersEmployeeNumber) {
        this.managersEmployeeNumber = managersEmployeeNumber;
    }

    public String getStore() {
        return store;
    }

    public void setStore(String store) {
        this.store = store;
    }


    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof PayrollSummary)) {
            return false;
        }
        PayrollSummary other = (PayrollSummary) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }
}

这是列表

中的一个对象 
package com.testing.xx.payrollsummary;

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class SalesCommission implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private Long employeeNumber;
    private Double salesAmount;

    @OneToOne
    private PayrollSummary payrollSummary;

    public PayrollSummary getPayrollSummary() {
        return payrollSummary;
    }

    public void setPayrollSummary(PayrollSummary payrollSummary) {
        this.payrollSummary = payrollSummary;
    }

    public Double getSalesAmount() {
        return salesAmount;
    }

    public void setSalesAmount(Double salesAmount) {
        this.salesAmount = salesAmount;
    }

    public Long getEmployeeNumber() {
        return employeeNumber;
    }

    public void setEmployeeNumber(Long employeeNumber) {
        this.employeeNumber = employeeNumber;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof SalesCommission)) {
            return false;
        }
        SalesCommission other = (SalesCommission) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }
}

我只是保持这部分简短易读：

<p:inputText id="saleCommission_employeeNumber_0" value="#{payrollSummaryWizard.payrollSummary.saleCommissions[0].employeeNumber}" required="true" label="Employee Number"/>

输出

javax.el.PropertyNotFoundException: /index.xhtml @30,203 value="#{payrollSummaryWizard.payrollSummary.saleCommissions[0].employeeNumber}": Target Unreachable, 'null' returned null

因此，我不认为Get specific element in a list or array using EL适用于这种情况。或许它确实如此，我没有正确初始化？我也尝试过几种不同的方式。

0 个答案:

没有答案
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