Spring 的XML注入和注解注入混合使用

Spring 的XML注入和注解注入混合使

方式	优点
XML	结构清晰易于阅读
Annotation	开发便捷，注入方便

1. 引入context命名空间
2. 在配置文件中添加context:annotation-config标签
3. XML管理类，注解进行属性注入

下面通过代码演示

文件目录

diDemo
- src
- - main
- - - java
- - - - com.zhangxin9727
- - - - - Persion.java
- - - - - Cat.java
- - - resources
- - - - applicationContext.xml
- - test
- - - java
- - - - MyTest.java
- pom.xml

详细代码

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <groupId>com.zhangxin9727</groupId>
    <artifactId>diDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.annotation</groupId>
            <artifactId>javax.annotation-api</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>
</project>

Person.java

package com.zhangxin9727;

import org.springframework.beans.factory.annotation.Value;

import javax.annotation.Resource;

public class Person {
    @Value("Alice")
    private String name;
    @Resource(name="cat")
    private Cat cat;

    @Override
    public String toString() {
        return "Person{" + "name='" + name + '\'' + ", cat=" + cat + '}';
    }
}

Cat.java

package com.zhangxin9727;

import org.springframework.beans.factory.annotation.Value;

public class Cat {
    @Value("Kitty")
    private String name;

    @Override
    public String toString() {
        return "Cat{" + "name='" + name + '\'' + '}';
    }
}

applicationContext.xml

<?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:annotation-config/>

    <bean id="person" class="com.zhangxin9727.Person"/>
    <bean id="cat" class="com.zhangxin9727.Cat"/>
</beans>

MyTest.java

import com.zhangxin9727.Person;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void test() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Person person = (Person) context.getBean("person");
        System.out.println(person);
    }
}