整个例子的结构目录如下:
1.自定义一个资源文件
com.sxd.name = 申九日木
com.sxd.secret = ${random.value}
com.sxd.intValue = ${random.int}
com.sxd.uuid = ${random.uuid}
com.sxd.age= ${random.int(100)} com.sxd.resume = 简历:①姓名:${com.sxd.name} ②年龄:${com.sxd.age}
2.将资源文件中的属性绑定到一个bean上
package com.sxd.beans; import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component; /**
* User实体
* @Component 声明User实体为一个bean
* @PropertySource 声明对应绑定了test.properties文件 【应对ConfigurationProperties注解取消掉location的属性】
* @ConfigurationProperties 对应绑定前缀为com.sxd的属性名
*/
@Component
@PropertySource(value = "classpath:/test.properties")
@ConfigurationProperties(prefix = "com.sxd")
public class User {
private String name;
private Integer age; //资源文件中定义的是com.sxd.uuid而不是uu,这里的uu字段只是测试如果名称不对应,是否会赋值成功
private String uu;
private String resume; 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;
} public String getUu() {
return uu;
} public void setUu(String uu) {
this.uu = uu;
} public String getResume() {
return resume;
} public void setResume(String resume) {
this.resume = resume;
}
}
3.spring boot的主入口
package com.sxd.secondemo; import com.sxd.beans.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; /**
* spring boot 的主入口类
* @RestController = @ResponseBody + @Controller
* @SpringBootApplication spring boot的核心注解
* @EnableConfigurationProperties 激活绑定资源文件的Bean,例如这里的User.class或者更多
*/
@RestController
@SpringBootApplication
@EnableConfigurationProperties(User.class)
public class SecondemoApplication { /**
* @Autowired 自动注入,需要@EnableConfigurationProperties中声明已经激活的Bean才能自动注入成功
*/
@Autowired
User user; /**
* 请求地址为localhost:8080/即可访问到本方法
* @return
*/
@RequestMapping("/")
public String hello(){
/**
* idea中 System.out.println()快捷方式为sout,然后Alt+Enter才能出来
*/
System.out.println(user.getResume()); return "打印简历:"+user.getResume()+"\n"+"uu是否有值:"+user.getUu();
} public static void main(String[] args) {
SpringApplication.run(SecondemoApplication.class, args);
}
}
4.运行结果: