SpringBoot读取配置的几种方式

落日映苍穹つ 2022-04-15 05:50 403阅读 0赞

Spring Boot使用了一个全局的配置文件application.properties或者application.yml，放在src/main/resources目录下或者类路径的/config下。Sping Boot的全局配置文件的作用是对一些默认配置的配置值进行修改

新建一个springboot的项目,在application.properties中添加

demo.name=zhangsan
    
    demo.mobile=0123456789

#   @Value #

直接在要使用的地方通过注解@Value(value=”$\{config.name\}”)就可以绑定到你想要的属性上面

例如：创建 DemoController，添加如下内容

@RestController
    public class DemoController {
    
        @Value("${demo.name}")
        private String name;
    
    
        @Value("${demo.mobile}")
        private String mobile;
    
        @RequestMapping(value = "config1")
        public String config1(){
            return name+"/"+mobile;
        }
    }

启动项目，访问 [http://localhost:8080/config1][http_localhost_8080_config1]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTMwODMyODQ_size_16_color_FFFFFF_t_70][]

#    @ConfigurationProperties #

有时候属性太多了，一个个绑定到属性字段上太累，官方提倡绑定一个对象的bean，这里我们建一个ConfigBean.java类，使用注解@ConfigurationProperties(prefix = “demo”)来指明

@Component
    @ConfigurationProperties(prefix = "demo")
    public class ConfigBean {
    
        private String name;
    
        private String mobile;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getMobile() {
            return mobile;
        }
    
        public void setMobile(String mobile) {
            this.mobile = mobile;
        }
    }

修改DemoController，添加

@Autowired
        ConfigBean configBean;
    
        @RequestMapping(value = "config2")
        public String config2(){
            return configBean.getName()+"/"+configBean.getMobile();
        }

启动项目访问 [http://localhost:8080/config2][http_localhost_8080_config2]

![20181122145835159.png][]

#    @PropertySource  #

自定义配置文件位置,在resource下创建config文件夹，在config文件夹下床架demo.properties 并添加如下内容

cionfig.demo.name=cionfig.zhangsan
    
    cionfig.demo.mobile=cionfig.0123456789

创建ConfigDemoBean类

@Component
    @PropertySource("config/demo.properties")
    @ConfigurationProperties(prefix = "cionfig.demo")
    public class ConfigDemoBean {
    
        private String name;
    
        private String mobile;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getMobile() {
            return mobile;
        }
    
        public void setMobile(String mobile) {
            this.mobile = mobile;
        }
    }

修改DemoController

@Autowired
        ConfigDemoBean configDemoBean;
    
        @RequestMapping(value = "configDemoBean")
        public String configDemo(){
            return configDemoBean.getName()+"/"+configDemoBean.getMobile();
        }

启动项目访问： [http://localhost:8080/configDemoBean][http_localhost_8080_configDemoBean]

![2018112215081434.png][]

##    注意！   ##

@PropertySource不支持yml文件读取。

[http_localhost_8080_config1]: http://localhost:8080/config1
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTMwODMyODQ_size_16_color_FFFFFF_t_70]: /images/20220415/2eb797acfcf34f3ca9a9250323a8de00.png
[http_localhost_8080_config2]: http://localhost:8080/config2
[20181122145835159.png]: /images/20220415/8f08f86e73c4424db73b3a2cc296518b.png
[http_localhost_8080_configDemoBean]: http://localhost:8080/configDemoBean
[2018112215081434.png]: /images/20220415/d436986059424b75aa2fc94a37853b6b.png