資訊專(zhuān)欄INFORMATION COLUMN
摘要：有以下三種配置在中配置在中配置自動(dòng)裝配自動(dòng)裝配這里以轉(zhuǎn)載為例子首先需要建立概念即，定義一個(gè)接口只需要實(shí)現(xiàn)添加兩個(gè)注解，定義接口規(guī)定方法為啟用組件掃描標(biāo)題內(nèi)容規(guī)定方法為掃描的時(shí)候，會(huì)直接按照該類(lèi)所在的包，作為基礎(chǔ)包，進(jìn)行掃描對(duì)依賴(lài)的實(shí)現(xiàn)自動(dòng)裝
有以下三種配置
在xml中配置
在java中配置
bean自動(dòng)裝配
這里以轉(zhuǎn)載CD為例子
首先需要建立CD概念
即，定義一個(gè)cd接口
只需要實(shí)現(xiàn)添加兩個(gè)注解，
package com.ming;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
/**
* 定義cd接口
* @author ming
*/
@Configuration
@ComponentScan
public interface CompactDisc {
/**
* 規(guī)定方法為play
*/
void play();
}
package com.ming;
import org.springframework.stereotype.Component;
/**
*
* @author ming
*/
// 啟用組件掃描
@Component
class SgtPeppers implements CompactDisc {
private String title = "標(biāo)題";
private String artist = "內(nèi)容";
/**
* 規(guī)定方法為play
*/
@Override
public void play() {
System.out.println(this.artist + this.title);
}
}
package com.ming;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import static org.junit.Assert.*;
public class CompactDiscTest {
private ApplicationContext applicationContext = null;
@Before
public void setUp() throws Exception {
applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
}
@After
public void tearDown() throws Exception {
}
@Test
public void play() {
CompactDisc compactDisc = applicationContext.getBean(CompactDisc.class);
assertNotNull(compactDisc);
}
}
掃描的時(shí)候，會(huì)直接按照該類(lèi)所在的包，作為基礎(chǔ)包，進(jìn)行掃描
對(duì)依賴(lài)的實(shí)現(xiàn)自動(dòng)裝配添加注解以后，初始化bean以后，會(huì)盡可能的滿(mǎn)足bean的依賴(lài)
目錄如下
package com.ming;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
*
* @author ming
*/
@Component
public class CDPlay implements MediaPlayer {
CompactDisc compactDisc = null;
@Autowired
public CDPlay(CompactDisc compactDisc){
this.compactDisc = compactDisc;
}
/**
* 規(guī)定方法為play
*/
@Override
public void play() {
compactDisc.play();
}
}
package com.ming;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
/**
* 定義cd接口
* @author ming
*/
@Configuration
@ComponentScan
public interface CompactDisc {
/**
* 規(guī)定方法為play
*/
void play();
}
package com.ming;
import org.springframework.context.annotation.ComponentScan;
/**
* @author ming
*/
@ComponentScan
public interface MediaPlayer {
/**
* 規(guī)定方法為play
*/
public void play();
}
package com.ming;
import org.springframework.stereotype.Component;
/**
*
* @author ming
*/
// 啟用組件掃描
@Component
class SgtPeppers implements CompactDisc {
private String title = "標(biāo)題";
private String artist = "內(nèi)容";
/**
* 規(guī)定方法為play
*/
@Override
public void play() {
System.out.println(this.artist + this.title);
}
}
