spring注解开发AnnotationConfigApplicationContext的使用

package com.myapp.config; import com.myapp.Entitlement; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public 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; } }

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; } }

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(); } }

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

技术分享图片

AppConfig.java

package com.myapp.config;

import com.myapp.Entitlement;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public 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

Entitlement
1
Entitlement2
2