SpringBoot项目配置放项目外部【3】

加载外部配置文件到项目中

实现外部配置在Java代码中使用

1. 增加一个配置文件读取类，设置读取配置的前缀

• 这种方式可以读取SpringBoot配置文件中任意的配置项，设置不同的前缀即可()；
• 虽然前面的loader和这个类可以把3个注解放一起，少一个类，但会导致这个类被加载2次还是会生产2个bean，获取ApplicationOutConfig 不是单例而导致其他问题，所以建议使用2个类。

package com.skxe.demo.config;


import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties("config.out")
public class ApplicationOutConfig {

    private Integer serverPort;
    private String serverName;

    public Integer getServerPort() {
        return serverPort;
    }

    public void setServerPort(Integer serverPort) {
        this.serverPort = serverPort;
        System.out.println("-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
        System.out.println("                           ------->>> 项目Main方法运行端口: " + serverPort +" <<<-------");
        System.out.println("-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");

    }

    public String getServerName() {
        return serverName;
    }

    public void setServerName(String serverName) {
        this.serverName = serverName;
        System.out.println("-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
        System.out.println("                           ------->>> 项目名称: "+ serverName +" <<<-------");
        System.out.println("-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");

    }
}

• 重启项目，查看打印日志会有

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                           ------->>> 项目Main方法运行端口: 8003 <<<-------
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                           ------->>> 项目名称: 项目外部文件测试 <<<-------
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

• 利用接口查看配置

@RequestMapping("/hello")
@RestController
public class Hello {

    @Autowired
    ApplicationOutConfig config;


    @RequestMapping("/test/{pathName}")
    public String test(@PathVariable("pathName") String pathName, String parmName){
        return "hello pathName | " + pathName + " ; parmName | " + parmName;
    }

    @RequestMapping("/test/config")
    public String testConfig(){
        return "hello  | " + config.getServerName();
    }

}

返回结果：hello | 项目外部文件测试

2. 直接使用注解取值

@RequestMapping("/hello")
@RestController
public class Hello {

    @Value("${config.out.server-name}")
    String serverName;

    @Autowired
    ApplicationOutConfig config;


    @RequestMapping("/test/{pathName}")
    public String test(@PathVariable("pathName") String pathName, String parmName){
        return "hello pathName | " + pathName + " ; parmName | " + parmName;
    }

    @RequestMapping("/test/value")
    public String testValue(){
        return "hello  | " + serverName;
    }

    @RequestMapping("/test/config")
    public String testConfig(){
        return "hello  | " + config.getServerName();
    }

}

返回结果：hello | 项目外部文件测试