- 修改配置
- @EnableAutoConfiguration
- 方式一：使用注解@Value
- 方式一：使用注解@ConfigurationProperties、@PropertySource、@Autowired
修改配置
在application.yml中添加您想要配置的数据，例如以下配置内容：
student:
name: Jim
age: 22
content: "name: ${student.name}, age: ${student.age}"
如何在Java代码中使用这些配置的数据呢？
@EnableAutoConfiguration
首先要使用该注解，该注解的作用可以搜索之，此处暂不详解。
方式一：使用注解@Value
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@EnableAutoConfiguration
public class HelloController {
@Value("${student.name}")
private String name;
@Value("${student.age}")
private Integer age;
@Value("${content}")
private String content;
@RequestMapping("/")
private String index() {
return content;
}
@RequestMapping("/index")
private String index2() {
return String.format("student: %s, age: %d\n", this.name, this.age);
}
}
方式一：使用注解@ConfigurationProperties、@PropertySource、@Autowired
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix = "student")
public class StudentProperties {
private String name;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
@PropertySource指定配置文件
例如在resources目录下创建test.yml用于存放测试数据：
student:
name: Jim(Test)
age: 22(Test)
使用该配置文件的数据，可以用@PropertySource指定使用的配置文件：
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
@Configuration
@ConfigurationProperties(prefix = "student")
@PropertySource("classpath:test.yml")
public class StudentTestBean {
private String name;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
使用注解@Autowired进行自动装配
@RestController
@EnableAutoConfiguration
public class HelloController {
@Value("${version}")
private String version;
@Autowired
private StudentProperties student_default;
@Autowired
private StudentTestBean student_test;
@RequestMapping("/student")
private String student(String name, Integer age) {
if (name == null) {
name = student_default.getName();
}
if (age == null) {
age = student_default.getAge();
}
return String.format("Online: %s\nname: %s, age: %d\nname(Test): %s, age(Test): %d", version, name, age, student_test.getName(), student_test.getAge());
}
}