Google Guice @Inject注解的使用_google inject-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_20612759/article/details/88894907

本文详细介绍了Google Guice框架中@ Inject注解的使用，从接口定义、实现类创建，到元注解的解释，以及如何在main函数中应用这些概念，最终展示运行结果。

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1.接口

package com.mycompany.addclient;

import com.google.inject.Singleton;

/**
 * @author  zhanyi
 * @date    20181224 14:51:29
 * @version V1.0
 * @desc    
 */

public interface Services {
public int mul();
public int Add();
}

2.实现类

package com.mycompany.addclient;

import com.google.inject.Inject;

/**
 * @author Alexs
 * @date 20181224 10:39:30
 * @email alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc
 */
public class GoodsService implements Services {

    @Override
    public int mul() {
        System.out.println(this.getClass().getName() + "====mul()");
        return 1;
    }

    @Override
    public int Add() {;
        System.out.println(this.getClass().getName() + "===Add()");
        return 1;
    }
}

package com.mycompany.addclient;

/**
 * @author  Alexs
 * @date    20181224 10:39:20
 * @email   alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc    
 */
public class PeopleService implements Services{

    @Override
    public int mul() {
        System.out.println(this.getClass().getName()+"====mul()");
        return 0;
    }

    @Override
    public int Add() {
        System.out.println(this.getClass().getName()+"====Add()");
        return 0;
    }

}

3.元注解

package com.mycompany.addclient;

import com.google.inject.BindingAnnotation;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author  Alexs
 * @date    20181224 17:04:23
 * @Add     http://www.baoquntecher.com
 * @email   alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc    
 */
@BindingAnnotation
@Target({ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface People {

}

package com.mycompany.addclient;

import com.google.inject.BindingAnnotation;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author  Alexs
 * @date    20181224 17:02:32
 * @Add     http://www.baoquntecher.com
 * @email   alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc    
 */
@BindingAnnotation
@Target({ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Good {

}

package com.mycompany.addclient;

import com.google.inject.Binder;
import com.google.inject.Module;
import com.google.inject.name.Names;
import io.vertx.core.cli.annotations.Name;

/**
 * @author  Alexs
 * @date    20181224 10:03:07
 * @email   alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc    
 */
public class AddModule implements Module{
    @Override
    public void configure(Binder binder) {
     binder.bind(Services.class).annotatedWith(Good.class).to(GoodsService.class);
     binder.bind(Services.class).annotatedWith(People.class).to(PeopleService.class);
     binder.bind(Service.class).to(ServiceImpl.class);
    }

}

package com.mycompany.addclient;

import com.google.inject.Inject;
import com.google.inject.name.Named;
import com.google.inject.name.Names;

/**
 * @author Alexs
 * @date 20181224 10:38:50
 * @email alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc
 */
public class ServiceImpl implements Service {

    private Services people;
    private Services goods;

    /**
     *
     * @param people
     * @param goods
     */
    @Inject
    public ServiceImpl(@People Services people, @Good Services goods) {
        this.people = people;
        this.goods = goods;
    }

    @Override
    public int sum() {
        people.Add();
        goods.Add();
        return 0;
    }

}

4.main函数

package com.mycompany.addclient;

import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import io.vertx.core.Vertx;

/**
 * @author Alexs
 * @date 20181224 9:58:49
 * @email alexs_zhan@powermaxtecher.net
 * @version V1.0
 * @desc
 */
public class AddClient {

    Vertx vertx;
    static ServiceImpl serviceImpl;

    public static void main(String[] args) {
        Injector injector = Guice.createInjector(new AddModule());
        Service services = injector.getInstance(Service.class);
        System.out.println("com.mycompany.addclient.AddClient.main()" + services.sum());

    }
}

5.结果
在这里插入图片描述