Converter类getAsObject将参数传递给接受对象的Service类

问题描述

我对转换器类 getAsObject 方法有疑问

I have question regarding Converter class getAsObject method

我有一个名为的服务EmployeeService employeeService

public List<Employees> getEmployees(Employees employees);

如果我想从Converter类的getAsObject调用上面的方法作为参数

If I want to call the above method from getAsObject of Converter class which as arguments

public Object getAsObject(FacesContext facesContext, UIComponent component,
            String value)
    employeeService.getEmployees(<?>)

如何将员工对象传递给 getEmployees 来自的方法getAsObject ？

How do I pass employees object to getEmployees method from getAsObject?

任何帮助都非常感谢。

更新1

@Entity
public class Employees implements Serializable {

private String employeeNumber;
private String employeeName;

推荐答案

使用以下转换器，只需转换数字（是字符串，根据您的代码）到员工对象：

Use a following converter, that simply converts number (which is a String, according to your code) to Employee object:

@Named("employeeConverter")
public class EmployeeConverter implements Converter {

    @Inject
    private EmployeeService employeeService;

    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        if(value == null || value.equals("")) {
            return null;
        }
        Employee employee = employeeService.getEmployeeByNumber(value);//or if it is not a String, replace value with Integer.parseInt(value)
        if(employee == null) {
            throw new ConverterException(new FacesMessage("Employee with number: " + value + " not found."));
        }
        return employee;
    }

    public String getAsString(FacesContext context, UIComponent component, Object value) {
        if (!(value instanceof Employee) || (value == null)) {
            return null;
        }
        return ((Employee)value).getEmployeeNumber();
    }

}

并在您的观看中使用它 converter =＃{employeeConverter}。

and use it in your views by converter="#{employeeConverter}".

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