@ManagedProperty的CDI替换 [英] CDI Replacement for @ManagedProperty

问题描述

我对CDI和JSF都很陌生，我正在尝试将Richfaces 4展示的一些代码转换为使用CDI而不是JSF注释。

I'm very new to both CDI and JSF, and I'm trying to convert some code from Richfaces 4 showcase to use CDI instead of JSF annotations.

我知道我可以使用@Named替换@MangedBean和@Inject来替换@ManagedProperty。但我遇到了一些麻烦。我正在尝试专门转换Richfaces Tree示例。

I understand that I can use @Named to replace @MangedBean and @Inject to replace @ManagedProperty. But I'm having some trouble. I'm trying to convert the Richfaces Tree example specifically.

我做了以下更改，我知道这不正确所以请不要使用此：

I have made the following changes and I know this is not correct so please don't use this:

//@ManagedBean
//@ViewScoped
@Named
@SessionScoped
public class TreeBean implements Serializable {
    private static final long serialVersionUID = 1L;
//    @ManagedProperty(value = "#{cdsParser.cdsList}")
//    private List<CDXmlDescriptor> cdXmlDescriptors;
    @Inject
    private Instance<CDXmlDescriptor> cdXmlDescriptors;
// I also Tried :
//  @Inject
//    private CDParser cdsParser;
//    private List<CDXmlDescriptor> cdXmlDescriptors = cdsParser.getCdsList();

........

然后我添加了（和我不确定这是否需要）：

Then I added (and I'm not sure this is needed):

@Named
@SessionScoped
public class CDXmlDescriptor implements Serializable { ...

并更改：

//@ManagedBean(name = "cdsParser")
@Named("CDParser")
//@Named
@SessionScoped
public class CDParser implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 3890828719623315368L;
    @Named
    private List<CDXmlDescriptor> cdsList;

我无法找出替换@ManagedProperty的正确方法（value =＃{cdsParser.cdsList} ）使用CDI？

I cannot figure out the proper way to replace @ManagedProperty(value = "#{cdsParser.cdsList}") using CDI?

推荐答案

因为你的 cdsList 没有bean类你需要一个生产者领域或制作方法使其可注射。

Since your cdsList is no bean class you need a producer field or a producer method to make it injectable.

生产者字段示例：

import javax.enterprise.inject.Produces;
...
@Named 
@Produces 
private List<CDXmlDescriptor> cdsList;

生产者方法示例：

import javax.enterprise.inject.Produces;

private List <CDXmlDescriptor> cdsList;
...
@Named("cdsList") 
@Produces 
public List<CDXmlDescriptor> getCdsList {
  return cdsList;
};

如果没有其他生产者字段或生产者方法返回相同的bean类型，则此方法有效。否则，您需要为生产者字段引入一个特殊限定符来解决歧义：

This works if there is no other producer field or producer method that returns the same bean type. Otherwise you need to introduce a special qualifier for your producer field to resolve ambiguity:

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.inject.Qualifier;


@Qualifier
@Retention(RUNTIME)
@Target({METHOD, FIELD, PARAMETER, TYPE})
public @interface CdsList {
}

带

@Named @Produces @CdsList
private List<CDXmlDescriptor> cdsList;

这篇关于@ManagedProperty的CDI替换的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！