全注解下的spring IOC之使用属性文件

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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 {