全注解下的spring IOC之使用属性文件

比眉伴天荒 2022-05-14 14:53 160阅读 0赞

## application.properties的加载 ##

database.driverName=com.mysql.jdbc.Driver
    database.url=jdbc:mysql://127.0.0.1:3306/qinhe
    database.username=root
    database.password=root

**方式1：采用@Value("$\{\}")方式**  
DatabaseProperties.java

package com.wuk.demo;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    @Component("databaseProperties")
    public class DatabaseProperties {
    
    	@Value("${database.driverName}")
    	private String driverName;
    	@Value("${database.url}")
    	private String url;
    	@Value("${database.username}")
    	private String username;
    	@Value("${database.password}")
    	private String password;
    	public String getDriverName() {
    		return driverName;
    	}
    	public void setDriverName(String driverName) {
    		this.driverName = driverName;
    	}
    	public String getUrl() {
    		return url;
    	}
    	public void setUrl(String url) {
    		this.url = url;
    	}
    	public String getUsername() {
    		return username;
    	}
    	
    	public void setUsername(String username) {
    		System.out.println(username);
    		this.username = username;
    	}
    	public String getPassword() {
    		return password;
    	}
    	
    	public void setPassword(String password) {
    		System.out.println(password);
    		this.password = password;
    	}
    	
    	
    }

测试

package com.wuk.demo;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    @Controller
    @SpringBootApplication
    public class SpringbootIocApplication {
    
    	@Autowired
    	private DatabaseProperties databaseProperties;
    	
    	public static void main(String[] args) {
    		SpringApplication.run(SpringbootIocApplication.class, args);
    	}
    	
    	@RequestMapping("/index")
    	@ResponseBody
    	public String goIndex(){
    		
    		return "Password="+databaseProperties.getPassword();
    	}
    }

结果：

Password=root

**方式2：采用@ConfigurationProperties(“database”)**

application.properties

database.driverName=com.mysql.jdbc.Driver
    database.url=jdbc:mysql://127.0.0.1:3306/qinhe
    database.username=root
    database.password=root

DatabaseProperties.java

package com.wuk.demo;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    @Component
    @ConfigurationProperties("database")
    public class DatabaseProperties {
    
    
    	private String driverName;
    
    	private String url;
    
    	private String username;
    
    	private String password;
    	public String getDriverName() {
    		return driverName;
    	}
    	public void setDriverName(String driverName) {
    		this.driverName = driverName;
    	}
    	public String getUrl() {
    		return url;
    	}
    	public void setUrl(String url) {
    		this.url = url;
    	}
    	public String getUsername() {
    		return username;
    	}
    	
    	public void setUsername(String username) {
    		System.out.println(username);
    		this.username = username;
    	}
    	public String getPassword() {
    		return password;
    	}
    	
    	public void setPassword(String password) {
    		System.out.println(password);
    		this.password = password;
    	}
    	
    	
    }

## 自定义文件jdbc.properties的加载 ##

database.driverName=com.mysql.jdbc.Driver
    database.url=jdbc:mysql://127.0.0.1:3306/qinhe
    database.username=root
    database.password=root

DatabaseProperties .java

@Component
    @ConfigurationProperties("database")
    @PropertySource("classpath:jdbc.properties")
    public class DatabaseProperties {

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