spring boot 注解

发表于 | 分类于
spring boot 注解

spring boot 注解

@Value

注入Spring boot application.properties配置的属性的值。

示例:

application.yml

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
spring:
  application:
    name: mytest
  mandatory-file-encoding: UTF-8
  http:
    encoding:
      enabled: true
      charset: utf-8
server:
  port: 9090
myConfig:
  myObject:
    myName: zhangshan
    myAge: 20

MyController

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
@RestController
@RequestMapping(value = "/api", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public class MyController {
    @Value("${myConfig.myObject.myName}")
    private String myName;
    @Value("${myConfig.myObject.myAge}")
    private int myAge;
    @RequestMapping(value = "/person",method = RequestMethod.GET)
    public Person getPerson() {
        Person person = new Person();
        person.setId(25);
        person.setName("张三");
        person.setBirthday(new Date());
        System.out.println(myName);
        System.out.println(myAge);
        return person;
    }
}

@Configuration

相当于传统的xml配置文件，如果有些第三方库需要用到xml文件，建议仍然通过@Configuration类作为项目的配置主类——可以使用@ImportResource注解加载xml配置文件。

示例：

MyConfigBean

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
public class MyConfigBean {
    @Value("${myConfig.myObject.myName}")
    private String myName;
    @Value("${myConfig.myObject.myAge}")
    private int myAge;
    public String getMyName() {
        return myName;
    }
    public void setMyName(String myName) {
        this.myName = myName;
    }
    public int getMyAge() {
        return myAge;
    }
    public void setMyAge(int myAge) {
        this.myAge = myAge;
    }
}

MyConfig

1
2
3
4
5
6
7
8
@Configuration
public class MyConfig {
    @Bean
    public MyConfigBean myConfigBean() {
        return new MyConfigBean();
    }
}

MyController

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
@RestController
@RequestMapping(value = "/api", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public class MyController {
    @Value("${myConfig.myObject.myName}")
    private String myName;
    @Value("${myConfig.myObject.myAge}")
    private int myAge;
    @Autowired
    private MyConfig myConfig;
    @RequestMapping(value = "/person",method = RequestMethod.GET)
    public Person getPerson() {
        Person person = new Person();
        person.setId(25);
        person.setName("张三");
        person.setBirthday(new Date());
        System.out.println(myName);
        System.out.println(myAge);
        System.out.println("==================");
        System.out.println(myConfig.myConfigBean().getMyName());
        System.out.println(myConfig.myConfigBean().getMyAge());
        return person;
    }
}