Google Guice的使用方式
作者:互联网
Google Guice(读音:juice)是从Google AdWords项目开源出来的一款轻量级的依赖注入(DI,Dependency Injection)框架(类似于spring boot依赖注入框架)
注解:@Inject 注入类(跟spring 的Autowired类似)
注解:@Singleton单例模式(跟spring 的Singleton类似)
主类:
package com.zhangmen;
import com.beust.jcommander.JCommander;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.zhangmen.context.BasicModule;
import com.zhangmen.entry.Student;
import com.zhangmen.service.TrackEventService;
import com.zhangmen.util.FileUtil;
import com.zhangmen.util.HdfsUtils;
import lombok.extern.slf4j.Slf4j;
import java.io.InputStream;
@Slf4j
public class TrackDataMain {
@Inject
private HdfsUtils hdfsUtils;
@Inject
private TrackEventService trackEventService;
@Inject
private Student student;
public static void main(String[] args) throws Exception {
log.info("DeduplicationJob.args:{}", String.join(" ", args));
try {
// Injector injector = Guice.createInjector(); //如果没有接口可以用这个,如果有接口及实现类,必须要在 BasicModule 中绑定
Injector injector = Guice.createInjector(new BasicModule());
TrackDataMain main = injector.getInstance(TrackDataMain.class);
main.execute(args);
} catch (Throwable ex) {
log.error(ex.getMessage(), ex);
throw ex;
}
}
private void execute(String[] args) throws Exception {
InputStream in = TrackDataMain.class.getClassLoader().getResourceAsStream("./application.properties");
String[] loadConfigs = FileUtil.loadConfigs(in);
JCommander.newBuilder()
.addObject(new Object[]{student})
.acceptUnknownOptions(true)
.build()
.parse(loadConfigs);
System.out.println(student.toString());
System.out.println(student.getName());
System.out.println("输出语句!!!");
String hdfsConfTmp = hdfsUtils.getHdfsConfTmp();
System.out.println(hdfsConfTmp);
System.out.println(trackEventService.getName());
}
}
绑定接口及实现类,让guice发现
package com.zhangmen.context;
import com.google.inject.AbstractModule;
import com.zhangmen.service.TrackEventService;
import com.zhangmen.service.impl.TrackEventServiceImpl;
public class BasicModule extends AbstractModule {
@Override
protected void configure() {
bind(TrackEventService.class).to(TrackEventServiceImpl.class);
// bind(SourceDelegation.class).to(KafkaSourceDelegation.class);
}
}
接口及实现类
注意: default 关键字的用法
package com.zhangmen.service;
/**
* @Author zsq
* @create 2021/6/17 17:35
* @Description:
*/
public interface TrackEventService {
/**
* default 修饰方法,则实现类的值优先于接口的方法
* @return
*/
default String getName() {
return null;
}
}
package com.zhangmen.service.impl;
import com.zhangmen.service.TrackEventService;
/**
* @Author zsq
* @create 2021/6/17 17:35
* @Description:
*/
public class TrackEventServiceImpl implements TrackEventService {
@Override
public String getName() {
return "来玩耍呀";
}
}
实体类: 通过 jcommander 来注入配置参数
package com.zhangmen.entry;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.Parameters;
import com.google.inject.Singleton;
import lombok.Data;
@Singleton
@Data
@Parameters(separators = "=")
public class Student {
@Parameter(names = "--kafka.consumer.servers")
private String name;
@Parameter(names = "--kafka.consumer.group.id")
private String age;
}
标签:Google,String,方式,Guice,zhangmen,public,import,com,class 来源: https://blog.csdn.net/qq_42016966/article/details/118967127