spring鍩轰簬@Value缁戝畾灞濨ean鎬уけ

Posted 2021-03-23

tags:

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鏍囩锛?a href='http://www.mamicode.com/so/1/xsd' title='xsd'>xsd str admin 閫昏緫 tco function 姝ｅ垯琛ㄨ揪寮忥細 ota class

package com.laowang.annotationBase;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ImportResource;
import org.springframework.stereotype.Repository;
("dao")
@ImportResource("classpath*:jdbc.properties")
public class  {
	
	@Value("${url}")
	private String url;
	
	@Value("${name}")
	private String name;
	
	@Value("${password}")
	private String password;
	
	public void save(){
		System.out.println("jsr saving...");
		System.out.println("url: "+url);
		System.out.println("name: "+name);
		System.out.println("password: "+password);
	}
	
	public void init(){
		System.out.println("init jsrDAO Bean ...");
	}
	
	public void destroy(){
		System.out.println("destroy jsrDAO Bean ...");
	}
}

璧勬簮鏂囦欢鍐呭

url=http://localhost:3306/database
name=root
password=root

JavaConfig绫伙紝Bean鐨勮閰嶅伐浣?/strong>


package com.laowang.annotationBase;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.test.context.ContextConfiguration;
@Configuration
public class JavaConfig {
	@Bean(name="dao", initMethod="init", destroyMethod="destroy")
	public JsrDAO getJseDAO(){
		return new JsrDAO();
	}
}

娴嬭瘯绫?/strong>
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package com.laowang.annotationBase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes=JavaConfig.class)
public class TestA {

@Autowired
private JsrDAO jsDao;

@Test
public void testDAO(){
jsDao.save();
}
澶т笓鏍?/a> spring鍩轰簬@Value缁戝畾灞濨ean鎬уけass="line">}

缁撴灉鑾峰緱鏁版嵁鏄剧ず涓?/p>
init jsrDAO Bean ... jsr saving... url: ${url} name: ${name} password: ${password} destroy jsrDAO Bean ...
闂鍑虹幇鍦ㄧ敤SpEL鍗犱綅绗︾粦瀹歜ean鐨勪笁涓睘鎬ф病鏈夋垚鍔燂紝姝ｇ‘鐨勭粨鏋滃簲璇ユ槸杩欐牱鐨?/p>
init jsrDAO Bean ... jsr saving... url: http://localhost:3306/database name: root password: root destroy jsrDAO Bean ...
闂鍑虹幇鍦ㄥ摢閲屽憿锛熸寜鐞嗚搴旇涓嶄細閿欑殑銆備簬鏄櫨搴︺€佽胺姝屾悳绱紝閮芥病瑙ｅ喅锛屾渶鍚庡幓浜唖pring瀹樻柟鏂囨。鐪嬪埌姝ｇ‘浣跨敤鏂瑰紡

鎵€浠ュ彧闇€瑕佷慨鏀笿avaConfig鏂囦欢灏卞彲浠ヤ簡锛屾坊鍔犱竴琛屾敞瑙ｏ紝鍙樻垚濡備笅锛?/p>
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package com.laowang.annotationBase;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
@Configuration
@ImportResource("classpath*:spring-annotationBase.xml")//杩欎釜蹇呴』瑕佸紩鍏ワ紝鍚﹁€呭緱鍒伴厤缃枃浠朵腑鐨勫€兼槸鏈夐棶棰樼殑锛屾湁浜嗚繖涓彲浠ヤ笉鐢ㄥ湪JsrDAO涓噸閰嶇疆浜嗭紝澶氫簡涔熸棤濡?/span>
public class JavaConfig {
@Bean(name="dao", initMethod="init", destroyMethod="destroy")
public JsrDAO getJseDAO(){
return new JsrDAO();
}

@Bean
public JsrService getJsrService(){
JsrService service =new JsrService();
service.setJsrDAO(getJseDAO());
return service;
}

}

鍚屾椂鍐嶆坊鍔犱竴涓搴旂殑xml閰嶇疆鏂囦欢锛屾寚瀹氬睘鎬ч厤缃枃浠剁殑浣嶇疆锛屾鏃禞srDAo涓睘鎬ф枃浠朵綅缃殑鎸囧畾涔熷彲浠ヤ笉鐢ㄤ簡銆?br/>涓嬮潰鏄搴旂殑xml鏂囦欢

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:/properties/jdbc.properties"/>
</beans>

1
env.getProperty("jdbc.name");

鍏蜂綋浣跨敤瑕佸弬鑰冩枃妗?/p>
瑙ｆ瀽灞炴€у崰浣嶇涓€鑸娇鐢⊿pEL璇█
SpEL璇█鐗规€у涓嬶細

浣跨敤bean鐨処D鏉ュ紩鐢╞ean

璋冪敤鏂规硶鍜岃闂璞＄殑灞炴€?/li>
瀵瑰€艰繘琛岀畻鏈€佸叧绯诲拰閫昏緫杩愮畻

姝ｅ垯琛ㄨ揪寮忓尮閰?/li>
闆嗗悎鎿嶄綔

璇?/em>

鈥?{鈥鈥?======琛ㄨ揪寮?br/>鈥?{鈥鈥?======鍗犱綅绗?/p>

瀛楅潰甯搁噺
鈥?{1}鈥?======璁＄畻缁撴灉涓?

寮曠敤bean銆佸睘鎬у拰鏂规硶
鈥?{bean}鈥?======寮曠敤bean
鈥?{bean.attr}鈥?======璁＄畻寰楀埌锛堝紩鐢級bean鐨勫睘鎬?br/>鈥?{systemProperties[鈥榡dbc.name鈥橾}鈥?======閫氳繃systemProperties瀵硅薄寮曠敤绯荤粺灞炴€э紙涓汉鐞嗚В涓哄紩鐢ㄥ舰鍚屽姞杞介厤缃枃浠朵腑鐨勫睘鎬х殑鍊硷級
鈥?{bean.method()}鈥?======璋冪敤bean鐨勬柟娉?br/>鈥?{bean.method()?.toUpperCase()}鈥?======鏂规硶杩斿洖涓嶄负绌烘椂缁х画璋冪敤toUpperCase()锛屽惁鍒欎笉璋冪敤

鍦ㄨ〃杈惧紡涓娇鐢ㄧ被鍨?/strong>
鈥?{T(java.lang.Math).random}鈥?======鍙兘璋冪敤绫荤殑闈欐€佹柟娉曞拰甯搁噺

SpEL 杩愮畻绗?/strong>
涓嶈浜?/em>

璁＄畻姝ｅ垯琛ㄨ揪寮忥細鏂囨湰锛坢atches锛夋鍒欒〃杈惧紡
鈥?{admin.email matches 鈥榌a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.com鈥檥鈥?======閭欢楠岃瘉

璁＄畻闆嗗悎
鈥?{bean.list[2].attr}鈥?======鑾峰彇bean涓粨鍚坙ist绗?涓厓绱犵殑attr灞炴€?/p>

SpEL 鍏朵粬杩愮畻绗?/em>

锛??[]锛夊闆嗗悎杩涜杩囨护銆俒]閲岄潰鏄〃杈惧紡
鈥?{bean.list.?[attr eq 鈥榣aowang鈥橾}鈥?/li>
.^[] 闆嗗悎涓煡璇㈢涓€涓尮閰嶉」

.$[] 闆嗗悎涓煡璇㈡渶鍚庝竴涓尮閰嶉」

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