Spring——@Autowired注解使用说明

系统管理员 2024-04-19 12:11 78阅读 0赞

### 方式一，放在构造方法上使用 ###

**代码示例**

private StudentService studentService;
    @Autowired
    public StudentDemoService(StudentService studentService){
        this.studentService = studentService;
    }

注意：当类中只有一个构造方法是可以省略@Autowired注解，但是有多个构造方法的时候，必须在多个构造方法中的其中一个标明@Autowired注解

[官方文档连接][Link 1]

**官方文档说明截图：**

![20190918104116134.png][]

### 方式二、放在set方法上使用 ###

private StudentService studentService;
    @Autowired
    public void setStudentDemoService(StudentService studentService){
          this.studentService = studentService;
    }

** 官网说明截图**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3MzA2MDQx_size_16_color_FFFFFF_t_70][]

### 方式三、放在普通方法上使用 ###

private StudentService studentService;
    @Autowired
    public void InjectTest(StudentService studentService){
        this.studentService = studentService;
    }

** 官网说明截图**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3MzA2MDQx_size_16_color_FFFFFF_t_70 1][]

### 方式四、放在类中的属性使用 ###

@Autowired
    private StudentService studentService;

[Link 1]: https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/core.html#beans-autowired-annotation
[20190918104116134.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/ab5fed4a14144b4bac90f6cf50360c5a.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3MzA2MDQx_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/529202d69ddc4306844b1249f237db9a.png