springboot自定义属性文件与bean映射注入属性值

主要有几点：

一、导入依赖

springboot的包和：

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>

版本在父类里统一管理了

<optional>true</optional>
</dependency>

一、配置自定义属性文件

 rabbit.config.host=192.168.135.129
 rabbit.config.port=5672
 rabbit.config.userName=guest
 rabbit.config.password=guest

二、在属性bean上的注解后期版本1.4以后主要是如下三个，且不需要在启动类上添加额外注解

@Component
@ConfigurationProperties(prefix="rabbit.config")
@PropertySource(value="classpath:config/rabbitmq.properties",encoding="utf-8")

也不需要在项目启动类上增加@EnableConfigurationProperties这个注解。

当然在打包的时候也要将该属性文件包含进来记得在pom文件的

<resources>
<resource>下面添加包含进自定义的文件，否则找不到文件报错。

项目启动类代码：

 package com.sharp.forward;
 
 import org.mybatis.spring.annotation.MapperScan;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 import com.sharp.forward.config.RabbitMQProperties;
 
 @SpringBootApplication
 //@ImportResource("classpath:config/application-user-service-dubbo.xml")
 @MapperScan(basePackages= {"com.sharp.forward.mapper"})
 @EnableAutoConfiguration
 public class Application implements CommandLineRunner{
 
     private static final Logger log = LoggerFactory.getLogger(Application.class);
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);
     }
 
     /**
      * @param args
      * @throws Exception
      */
     @Override
     public void run(String... args) throws Exception {
          String config = "host: " + RabbitMQProperties.getHost()
          + ", config.port:" + RabbitMQProperties.getPort()
          + ", config.userName:" + RabbitMQProperties.getUserName();
 
 log.info("SpringBoot2.0实现自定义properties配置文件与JavaBean映射:" + config);
 
     }
 
 }

启动项目后打印如下：

INFO com.sharp.forward.Application - SpringBoot2.0实现自定义properties配置文件与JavaBean映射:host: null, config.port:0, config.userName:null

说明没有注入进来，然后在看我的属性bean类

 /**
  *
  */
 package com.sharp.forward.config;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.stereotype.Component;
 
 /**
  * @author 醉逍遥
  *
  */
 @Component
 @ConfigurationProperties(prefix="rabbit.config")
 @PropertySource(value="classpath:config/rabbitmq.properties",encoding="utf-8")
 public class RabbitMQProperties {
 
     private static String host;
 
     private static int port;
 
     private static String userName;
 
     private static String password;
 
     public static String getHost() {
         return host;
     }
     public static void setHost(String host) {
         RabbitMQProperties.host = host;
     }
     public static int getPort() {
         return port;
     }
     public static void setPort(int port) {
         RabbitMQProperties.port = port;
     }
     public static String getUserName() {
         return userName;
     }
     public static void setUserName(String userName) {
         RabbitMQProperties.userName = userName;
     }
     public static String getPassword() {
         return password;
     }
     public static void setPassword(String password) {
         RabbitMQProperties.password = password;
     }
 
 }

各属性和方法都是静态的，问题就出在这里，于是将静态的均修改掉如下

属性bean

 /**
  *
  */
 package com.sharp.forward.config;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.stereotype.Component;
 
 /**
  * @author 醉逍遥
  *
  */
 @Component
 @ConfigurationProperties(prefix="rabbit.config")
 @PropertySource(value="classpath:config/rabbitmq.properties",encoding="utf-8")
 public class RabbitMQProperties {
 
     public String getHost() {
         return host;
     }
 
     public void setHost(String host) {
         this.host = host;
     }
 
     public int getPort() {
         return port;
     }
 
     public void setPort(int port) {
         this.port = port;
     }
 
     public String getUserName() {
         return userName;
     }
 
     public void setUserName(String userName) {
         this.userName = userName;
     }
 
     public String getPassword() {
         return password;
     }
 
     public void setPassword(String password) {
         this.password = password;
     }
 
     private  String host;
 
     private int port;
 
     private  String userName;
 
     private  String password;
 
 }

启动类

 package com.sharp.forward;
 
 import org.mybatis.spring.annotation.MapperScan;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 import com.sharp.forward.config.RabbitMQProperties;
 
 @SpringBootApplication
 //@ImportResource("classpath:config/application-user-service-dubbo.xml")
 @MapperScan(basePackages= {"com.sharp.forward.mapper"})
 @EnableAutoConfiguration
 public class Application implements CommandLineRunner{
 
     private static final Logger log = LoggerFactory.getLogger(Application.class);
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);
     }
 
     @Autowired
     private RabbitMQProperties rabbitMQProperties;
     /**
      * @param args
      * @throws Exception
      */
     @Override
     public void run(String... args) throws Exception {
          String config = "host: " + rabbitMQProperties.getHost()
          + ", config.port:" + rabbitMQProperties.getPort()
          + ", config.userName:" + rabbitMQProperties.getUserName();
 
 log.info("SpringBoot2.0实现自定义properties配置文件与JavaBean映射:" + config);
 
     }
 
 }

再次启动如下：

说明属性值已经读取。

同样将属性bean修改为如下也不能在在初始化中为静态变量赋值

 /**
  *
  */
 package com.sharp.forward.config;
 
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.stereotype.Component;
 
 /**
  * @author 醉逍遥
  *
  */
 @Component
 @ConfigurationProperties(prefix="rabbit.config")
 @PropertySource(value="classpath:config/rabbitmq.properties",encoding="utf-8")
 public class RabbitMQProperties {
 
     private static String host;
 
     private static int port;
 
     private static String userName;
 
     private static String password;
 
     public static String getHost() {
         return host;
     }
     @Value(value="${host}")
     public static void setHost(String host) {
         RabbitMQProperties.host = host;
         System.out.println("host----------->"+host);
     }
     public static int getPort() {
         return port;
     }
     @Value(value="${rabbit.config.port}")
     public static void setPort(int port) {
         RabbitMQProperties.port = port;
         System.out.println("port----------->"+port);
     }
     public static String getUserName() {
         return userName;
     }
     @Value(value="${userName}")
     public static void setUserName(String userName) {
         RabbitMQProperties.userName = userName;
     }
     public static String getPassword() {
         return password;
     }
     public static void setPassword(String password) {
         RabbitMQProperties.password = password;
     }
 
 }

运行结果同样都是空或0；

参考https://www.cnblogs.com/hsz-csy/p/9625950.html，可以解决为静态变量赋值的问题，set方法一定要是非静态的

修改为

/**
 *
 */
package com.sharp.forward.config;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
 
/**
 * @author 醉逍遥
 *
 */
@Component
@ConfigurationProperties(prefix="rabbit.config")
@PropertySource(value="classpath:config/rabbitmq.properties",encoding="utf-8")
public class RabbitMQProperties {
 
    private static String host;
 
    private static int port;
 
    private static String userName;
 
    private static String password;
 
    public static String getHost() {
        return host;
    }
    @Value(value="${host}")
    public static void setHost(String host) {
        RabbitMQProperties.host = host;
        System.out.println("host----------->"+host);
    }
    public static int getPort() {
        return port;
    }
    @Value(value="${rabbit.config.port}")
    public void setPort(int port) {
        RabbitMQProperties.port = port;
        System.out.println("port----------->"+port);
    }
    public static String getUserName() {
        return userName;
    }
    @Value(value="${userName}")
    public void setUserName(String userName) {
        RabbitMQProperties.userName = userName;
    }
    public static String getPassword() {
        return password;
    }
    public static void setPassword(String password) {
        RabbitMQProperties.password = password;
    }
 
}

其他不变，

com.sharp.forward.Application - SpringBoot2.0实现自定义properties配置文件与JavaBean映射:host: null, config.port:5672, config.userName:guest

host没取到是因为value中路径写个重复前缀的实验用了。