这篇文章主要介绍“@Resources, @Inject和@Autowired的区别是什么”,在日常操作中,相信很多人在@Resources, @Inject和@Autowired的区别是什么问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”@Resources, @Inject和@Autowired的区别是什么”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!

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@Resources
官方文档里对@Resources的说明:
The @Resource annotation is part of the JSR-250 annotation collection and is packaged with Jakarta EE.
什么是JSR-250呢?访问这个链接:https://id=250https://id=330
注入的优先级:
- Match by Type 
- Match by Qualifier 
- Match by Name 
Match by Type
注意@Inject注入的最高优先级方式为Match by Type,而非@Resource的Match by Name.
任意定义一个待注入的Component:
@Componentpublic class ArbitraryDependency {
    private final String label = "Arbitrary Dependency";
    public String toString() {
        return label;
    }}使用@Inject注入:
@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(
  loader=AnnotationConfigContextLoader.class,
  classes=ApplicationContextTestInjectType.class)public class FieldInjectIntegrationTest {
    @Inject
    private ArbitraryDependency fieldInjectDependency;
    @Test
    public void givenInjectAnnotation_WhenOnField_ThenValidDependency(){
        assertNotNull(fieldInjectDependency);
        assertEquals("Arbitrary Dependency",
          fieldInjectDependency.toString());
    }}Match by Qualifier
定义一个新的待注入组件:
public class AnotherArbitraryDependency extends ArbitraryDependency {
    private final String label = "Another Arbitrary Dependency";
    public String toString() {
        return label;
    }}测试代码:
@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(
  loader=AnnotationConfigContextLoader.class,
  classes=ApplicationContextTestInjectQualifier.class)public class FieldQualifierInjectIntegrationTest {
    @Inject
    private ArbitraryDependency defaultDependency;
    @Inject
    private ArbitraryDependency namedDependency;
    @Test
    public void givenInjectQualifier_WhenOnField_ThenDefaultFileValid(){
        assertNotNull(defaultDependency);
        assertEquals("Arbitrary Dependency",
          defaultDependency.toString());
    }
    @Test
    public void givenInjectQualifier_WhenOnField_ThenNamedFileValid(){
        assertNotNull(defaultDependency);
        assertEquals("Another Arbitrary Dependency",
          namedDependency.toString());
    }}和之前@Resource的第一次试图通过Match by Type注入一样失败,遇到异常:NoUniqueBeanDefinitionException
利用@Qualifier避免这个异常:
@Inject@Qualifier("defaultFile")private ArbitraryDependency defaultDependency;@Inject@Qualifier("namedFile")private ArbitraryDependency namedDependency;Match by Name
public class YetAnotherArbitraryDependency extends ArbitraryDependency {
    private final String label = "Yet Another Arbitrary Dependency";
    public String toString() {
        return label;
    }}消费者代码:
@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(
  loader=AnnotationConfigContextLoader.class,
  classes=ApplicationContextTestInjectName.class)public class FieldByNameInjectIntegrationTest {
    @Inject
    @Named("yetAnotherFieldInjectDependency")
    private ArbitraryDependency yetAnotherFieldInjectDependency;
    @Test
    public void givenInjectQualifier_WhenSetOnField_ThenDependencyValid(){
        assertNotNull(yetAnotherFieldInjectDependency);
        assertEquals("Yet Another Arbitrary Dependency",
          yetAnotherFieldInjectDependency.toString());
    }}application context代码:
@Configurationpublic class ApplicationContextTestInjectName {
    @Bean
    public ArbitraryDependency yetAnotherFieldInjectDependency() {
        ArbitraryDependency yetAnotherFieldInjectDependency =
          new YetAnotherArbitraryDependency();
        return yetAnotherFieldInjectDependency;
    }}到此,关于“@Resources, @Inject和@Autowired的区别是什么”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注创新互联网站,小编会继续努力为大家带来更多实用的文章!
文章名称:@Resources,@Inject和@Autowired的区别是什么
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