spring注解开发AnnotationConfigApplicationContext的使用-白红宇

spring注解开发AnnotationConfigApplicationContext的使用

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发布时间：2019-06-07

本文共 3810 字，大约阅读时间需要 12 分钟。

使用AnnotationConfigApplicationContext可以实现基于Java的配置类加载Spring的应用上下文。避免使用application.xml进行配置。相比XML配置，更加便捷。

示例

AppConfig.java

package com.myapp.config;import com.myapp.Entitlement;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class AppConfig {    @Bean(name="entitlement")    public Entitlement entitlement() {        Entitlement ent= new Entitlement();        ent.setName("Entitlement");        ent.setTime(1);        return ent;    }    @Bean(name="entitlement2")    public Entitlement entitlement2() {        Entitlement ent= new Entitlement();        ent.setName("Entitlement2");        ent.setTime(2);        return ent;    }}

注：

@Configuration可理解为用spring的时候xml里面的<beans>标签

@Bean可理解为用spring的时候xml里面的<bean>标签

Entitlement.java

package com.myapp;public class Entitlement {    private String name;    private int time;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getTime() {        return time;    }    public void setTime(int time) {        this.time = time;    }}

测试

JavaConfigTest.java

package com.myapp;import com.myapp.config.AppConfig;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class JavaConfigTest {    public static void main(String[] arg) {        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();        ctx.register(AppConfig.class);        ctx.refresh();        Entitlement ent = (Entitlement)ctx.getBean("entitlement");        System.out.println(ent.getName());        System.out.println(ent.getTime());        Entitlement ent2 = (Entitlement)ctx.getBean("entitlement2");        System.out.println(ent2.getName());        System.out.println(ent2.getTime());        ctx.close();    }}

结果

Entitlement1Entitlement22

使用AnnotationConfigApplicationContext可以实现基于Java的配置类加载Spring的应用上下文。避免使用application.xml进行配置。相比XML配置，更加便捷。

示例

AppConfig.java

package com.myapp.config;import com.myapp.Entitlement;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class AppConfig {    @Bean(name="entitlement")    public Entitlement entitlement() {        Entitlement ent= new Entitlement();        ent.setName("Entitlement");        ent.setTime(1);        return ent;    }    @Bean(name="entitlement2")    public Entitlement entitlement2() {        Entitlement ent= new Entitlement();        ent.setName("Entitlement2");        ent.setTime(2);        return ent;    }}

注：

@Configuration可理解为用spring的时候xml里面的<beans>标签

@Bean可理解为用spring的时候xml里面的<bean>标签

Entitlement.java

package com.myapp;public class Entitlement {    private String name;    private int time;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getTime() {        return time;    }    public void setTime(int time) {        this.time = time;    }}

测试

JavaConfigTest.java

package com.myapp;import com.myapp.config.AppConfig;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class JavaConfigTest {    public static void main(String[] arg) {        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();        ctx.register(AppConfig.class);        ctx.refresh();        Entitlement ent = (Entitlement)ctx.getBean("entitlement");        System.out.println(ent.getName());        System.out.println(ent.getTime());        Entitlement ent2 = (Entitlement)ctx.getBean("entitlement2");        System.out.println(ent2.getName());        System.out.println(ent2.getTime());        ctx.close();    }}

结果