这篇文章主要介绍了spring怎么实现依赖注入DI的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇spring怎么实现依赖注入DI文章都会有所收获，下面我们一起来看看吧。
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mvn archetype:generate -DarchetypeCatalog=internal引入需要的依赖，首先spring-context，还是spring-test，最后还有junit。
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<springframework.version>4.3.7.RELEASE</springframework.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${springframework.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${springframework.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>utf-8</encoding>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<archive>
<manifest>
<mainClass>com.xueyoucto.xueyou.App</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>package com.xueyou.demo;
import org.springframework.stereotype.Component;
@Component
public class Person {
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
private String name;
}package org.xueyou.demo;
import org.springframework.stereotype.Component;
@Component
public class Body {
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
private int id;
}需要注意的是，这里需要指定扫描的包
package com.xueyou.demo;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
/**
* Hello world!
*/
@Configuration
@ComponentScan(basePackages = {"org.xueyou.demo","com.xueyou.demo"})
public class App {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}package com.xueyou.demo;
import org.junit.Assert;
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;
import org.xueyou.demo.Body;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = App.class)
public class Springtest {
@Autowired
private Body body;
@Autowired
private Person person;
@Test
public void testBodyIsNull(){
Assert.assertNotNull(body);
}
@Test
public void testPersonIsNull(){
Assert.assertNotNull(person);
}
}结果如下：
Person类和Student类已经被依赖注入到spring中，spring能够使用这两个类了。
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.7.RELEASE</version>
<scope>test</scope>
</dependency>去掉
<scope>test</scope>关于“spring怎么实现依赖注入DI”这篇文章的内容就介绍到这里，感谢各位的阅读！相信大家对“spring怎么实现依赖注入DI”知识都有一定的了解，大家如果还想学习更多知识，欢迎关注亿速云行业资讯频道。
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