19点睛Spring4.1-GroovyDSL

19.1 Groovy DSL

• Spring 4.x的一个新特性是使用Groovy的语言来配置Spring的bean;
• 这意味着我们构造一个spring的bean又多了一种方式,包括如下:
  • xml配置
  • java config(@Bean)
  • @Component,@Service,@Repository,@Controller系列
  • Groovy DSL

19.2 示例

19.2.1 演示类

package com.wisely.dsl;

public class DemoService {
    private String msg;

    public String sayHello(){
        return "hello "+msg;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

}

19.2.2 使用groovy配置DemoService为bean

• DemoConfig.groovy

import com.wisely.dsl.DemoService//import要注册为bean的类
//所有的bean的声明放在beans下
beans{
//demoService为bean name,DemoService为类本身,msg = "world"为注入的属性
    demoService(DemoService){
        msg = "world"
    }
}

19.2.3 测试

package com.wisely.dsl;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;

@Configuration
@ImportResource("classpath:com/wisely/dsl/DemoConfig.groovy")
public class Main {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
               new AnnotationConfigApplicationContext("com.wisely.dsl");
        DemoService ds =context.getBean(DemoService.class);
        System.out.println(ds.sayHello());
        context.close();
    }

}

输出结果

Hello World