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java配置文件取值的多種方式總結(jié)

更新時(shí)間：2023年11月17日 14:29:38 作者：deelless

這篇文章主要為大家詳細(xì)介紹了java配置文件取值的多種方式,包括一般項(xiàng)目,國際化項(xiàng)目,springboot項(xiàng)目,文中的示例代碼講解詳細(xì),需要的可以參考下

1.一般項(xiàng)目

1.1demo結(jié)構(gòu)如下

1.2取值

import java.io.InputStream;
import java.util.Properties;

public class JavaConfigTest {
	private static final String CONFIG_FILE= "config.properties";

	//java jdk提供讀取配置文件工具類
	private static Properties props=new Properties();


	public static void main(String[] args){
		String value  = getConfigValue("aaa");

		System.out.println("配置文件中的值是："+value);
	}

	public static String getConfigValue(String key){
		String value=null;
		try {
			InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(CONFIG_FILE);
			if(in!=null){
				props.load(in);
				value = props.getProperty(key);
				in.close();
			}
		}catch (Exception e){
			e.printStackTrace();
		}

		return value;
	}
}

1.3測(cè)試結(jié)果

2.國際化項(xiàng)目

2.1demo結(jié)構(gòu)

2.2取值

import java.util.Locale;
import java.util.ResourceBundle;

public class I18NConfigTest {
	public static void main(String[] args){
		String value = GetI18nConfigValue("ccc");
		System.out.println("國際化配置文件中的值是："+value);
	}

	public static String GetI18nConfigValue(String key){
		Locale currentLocale = new Locale("en","US");
		ResourceBundle bundle = ResourceBundle.getBundle("messages_en", currentLocale);
		String value = bundle.getString(key);
		return value;
	}
}

2.3測(cè)試結(jié)果

3.SpringBoot項(xiàng)目

3.1demo結(jié)構(gòu)

3.2 取值

springboot項(xiàng)目基于動(dòng)態(tài)代理創(chuàng)建bean，再依賴注入取值

創(chuàng)建bean

package com.example.demo.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;


@Component    //動(dòng)態(tài)代理
public class SpringBootCongigTest {
	//配置文件中的key
	@Value("${sentinel}")
	private String sentinel;
	@Value("${aaa}")
	private String aaa;

	public String getSentinel() {
		return sentinel;
	}

	public void setSentinel(String sentinel) {
		this.sentinel = sentinel;
	}

	public String getAaa() {
		return aaa;
	}

	public void setAaa(String aaa) {
		this.aaa = aaa;
	}
}

springboot單元測(cè)試注解需要的依賴：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>

單元測(cè)試，依賴注入

import com.example.demo.DemoApplication;
import com.example.demo.config.SpringBootCongigTest;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class TestConfig {
	@Autowired
	private  SpringBootCongigTest springBootCongigTest;


	@Test
	public void testSpringBootConfig(){
		String aaa = springBootCongigTest.getAaa();
		String sentinel = springBootCongigTest.getSentinel();
		System.out.println("配置文件輸出的sentinel結(jié)果是："+sentinel);
		System.out.println("配置文件輸出的aaa結(jié)果是："+aaa);
	}

}

3.3測(cè)試結(jié)果

4.SpringBoot項(xiàng)目yml文件取值

4.1demo結(jié)構(gòu)

4.2取值

也是分兩步，基于注解；動(dòng)態(tài)代理，依賴注入

動(dòng)態(tài)代理：

package com.example.demo.config;

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

@Component
@ConfigurationProperties(prefix = "redis")
public class SpringBootCongigTest {

	private String sentinel;

	private String aaa;

	public String getSentinel() {
		return sentinel;
	}

	public void setSentinel(String sentinel) {
		this.sentinel = sentinel;
	}

	public String getAaa() {
		return aaa;
	}

	public void setAaa(String aaa) {
		this.aaa = aaa;
	}
}

依賴注入

import com.example.demo.DemoApplication;
import com.example.demo.config.SpringBootCongigTest;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class TestConfig {
	@Autowired
	private  SpringBootCongigTest springBootCongigTest;


	@Test
	public void testSpringBootConfig(){
		String aaa = springBootCongigTest.getAaa();
		String sentinel = springBootCongigTest.getSentinel();
		System.out.println("配置文件輸出的sentinel結(jié)果是："+sentinel);
		System.out.println("配置文件輸出的aaa結(jié)果是："+aaa);
	}

}