Autowire 在 junit 测试中不起作用

Question

我确信我错过了一些简单的事情。 bar 在 junit 测试中被自动装配，但为什么 foo 内的 bar 没有被自动装配？

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"beans.xml"})
public class BarTest {  

    @Autowired
    Object bar;

    @Test
    public void testBar() throws Exception {
            //this works
        assertEquals("expected", bar.someMethod());
            //this doesn't work, because the bar object inside foo isn't autowired?
        Foo foo = new Foo();
        assertEquals("expected", foo.someMethodThatUsesBar());
    }
}

Answer 1

Foo 不是托管 spring bean，您自己实例化它。因此 Spring 不会为您自动装配任何依赖项。

Answer 2

您只是创建 Foo 的一个新实例。该实例不知道 Spring 依赖注入容器。您必须在测试中自动装配 foo：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"beans.xml"})
public class BarTest {  

    @Autowired
    // By the way, the by type autowire won't work properly here if you have
    // more instances of one type. If you named them  in your Spring
    // configuration use @Resource instead
    @Resource(name = "mybarobject")
    Object bar;
    @Autowired
    Foo foo;

    @Test
    public void testBar() throws Exception {
            //this works
        assertEquals("expected", bar.someMethod());
            //this doesn't work, because the bar object inside foo isn't autowired?
        assertEquals("expected", foo.someMethodThatUsesBar());
    }
}