Spring Bean管理（XML方式）

Posted 2021-03-05 shouyaya

1.通过maven建立spring依赖：

<?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>

  <groupId>org.yzy</groupId>
  <artifactId>springIoc</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>springIoc Maven Webapp</name>
  <!-- FIXME change it to the project\'s website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.2.4.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.4.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>5.2.4.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>5.2.4.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

  </dependencies>

  <build>
    <finalName>springIoc</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

2.Ioc（控制反转）将新建对象的权限赋予spring

新建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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="Demo1" class="org.yzy.Demo1"></bean>     <!-- 将Demo1这个类控制反转-->
</beans>

通过Application来新建一个对象：

public void test(){
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
        Demo1 demo1 =(Demo1) applicationContext.getBean("Demo1");     
        demo1.sayHello();
    }

 

Spring的工厂类：

 

 三种实例化Bean的方式

使用类构造器实例化（默认无参数）：

    <!--第一种：无参构造器的方式-->
    <bean id="bean1" class="com.imooc.ioc.demo2.Bean1"/>

使用静态工厂方法实例化（简单工厂模式）

<!--第二种：静态工厂的方式-->
    <bean id="bean2" class="com.imooc.ioc.demo2.Bean2Factory" factory-method="createBean2"/>

使用实例工厂方法实例化（工厂方法模式）

    <!--第三种：实例工厂的方式-->
    <bean id="bean3Factory" class="com.imooc.ioc.demo2.Bean3Factory"/>
    <bean id="bean3" factory-bean="bean3Factory" factory-method="createBean3"/>

关于bean标签下的id、name、class和scope

 

 

 

 bean的生命周期：

 

 

 

 spring的属性注入

 

 例子：

package org.yzy;

import java.util.*;

public class collectionDemo {
    private String name;
    private int age;
    private String [] strings;
    private List<String> lists;
    private Set<String> sets;
    private Properties properties;
    private Map<String,String> maps;
    private Demo1 demo1;

    @Override
    public String toString() {
        return "collectionDemo{" +
                "name=\'" + name + \'\\\'\' +
                ", age=" + age +
                ", strings=" + Arrays.toString(strings) +
                ", lists=" + lists +
                ", sets=" + sets +
                ", properties=" + properties +
                ", maps=" + maps +
                ", demo1=" + demo1 +
                \'}\';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String[] getStrings() {
        return strings;
    }

    public void setStrings(String[] strings) {
        this.strings = strings;
    }

    public List<String> getLists() {
        return lists;
    }

    public void setLists(List<String> lists) {
        this.lists = lists;
    }

    public Set<String> getSets() {
        return sets;
    }

    public void setSets(Set<String> sets) {
        this.sets = sets;
    }

    public Properties getProperties() {
        return properties;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public Map<String, String> getMaps() {
        return maps;
    }

    public void setMaps(Map<String, String> maps) {
        this.maps = maps;
    }

    public Demo1 getDemo1() {
        return demo1;
    }

    public void setDemo1(Demo1 demo1) {
        this.demo1 = demo1;
    }
}

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

    <bean id="Demo1" class="org.yzy.Demo1"></bean>
    <bean id="collection" class="org.yzy.collectionDemo">
        <property name="name" value="#{\'yzy\'}"></property>
        <property name="age" value="#{18}"></property>
        <property name="demo1" value="#{Demo1}"></property>
        <property name="strings">
            <list>
                <value>hhh</value>
                <value>ttt</value>
                <value>aaa</value>
            </list>
        </property>
        <property name="lists">
            <list>
                <value>123</value>
                <value>456</value>
                <value>789</value>
            </list>
        </property>
        <property name="maps">
            <map>
                <entry key="yyy" value="nb"></entry>
                <entry key="xxx" value="bnb"></entry>
                <entry key="hhh" value="kx"></entry>
            </map>
        </property>
        <property name="properties">
            <props>
                <prop key="yyy">nb</prop>
                <prop key="xxx">bnb</prop>
                <prop key="hhh">kx</prop>
            </props>
        </property>
        <property name="sets">
            <set>
                <value>hhh</value>
                <value>yyy</value>
                <value>xxx</value>
            </set>
        </property>
    </bean>
</beans>