Guice学习 原
Guice的github地址: https://github.com/google/guice/wiki/Motivation
这个例子很简单，如果会点Guice，那么不需要再往下看了。
简单来说，它是dependeny injection框架，它与Spring相比，作者已经给出了，见原文
1.添加依赖
List-1 pom.xml中添加如下依赖
<dependency>
<groupId>com.google.inject</groupId>
<artifactId>guice</artifactId>
<version>4.0</version>
</dependency>2.定义接口及实现类
2.1 CreditCardProcessor
List-2
/**
* @author dmj1161859184@126.com 2018-09-10 20:00
* @version 1.0
* @since 1.0
*/
public interface CreditCardProcessor {
ChargeResult charge(CreditCard credit, Object amount);
}
/**
* @author dmj1161859184@126.com 2018-09-10 20:42
* @version 1.0
* @since 1.0
*/
public class PaypalCreditCardProcessorImpl implements CreditCardProcessor {
@Override
public ChargeResult charge(CreditCard credit, Object amount) {
LOG.info("charge方法");
return null;
}
}2.2 TransactionLog
List-3
/**
* @author dmj1161859184@126.com 2018-09-10 20:00
* @version 1.0
* @since 1.0
*/
public interface TransactionLog {
void logChargeResult(ChargeResult result);
void logConnectException(Exception e);
}
/**
* @author dmj1161859184@126.com 2018-09-10 20:07
* @version 1.0
* @since 1.0
*/
public class DatabaseTransactionLogImpl implements TransactionLog {
@Override
public void logChargeResult(ChargeResult result) {
LOG.info("logChargeResult方法");
}
@Override
public void logConnectException(Exception e) {
LOG.info("logConnectException方法");
}
}2.3 BillingService
List-4
/**
* @author dmj1161859184@126.com 2018-09-10 19:59
* @version 1.0
* @since 1.0
*/
public interface BillingService {
Receipt chargeOrder(PizzaOrder order, CreditCard credit);
}
/**
* @author dmj1161859184@126.com 2018-09-10 20:00
* @version 1.0
* @since 1.0
*/
public class BillingServiceImpl implements BillingService {
private final CreditCardProcessor processor;
private final TransactionLog transactionLog;
@Inject
public BillingServiceImpl(CreditCardProcessor processor,
TransactionLog transactionLog) {
this.processor = processor;
this.transactionLog = transactionLog;
}
@Override
public Receipt chargeOrder(PizzaOrder order, CreditCard credit) {
try {
ChargeResult result = processor.charge(credit, order.getAmount());
transactionLog.logChargeResult(result);
return result.wasSuccessful()
? Receipt.forSuccessfulCharge(order.getAmount())
: Receipt.forDeclinedCharge(result.getDeclineMessage());
} catch (Exception e) {
transactionLog.logConnectException(e);
return Receipt.forSystemFailure(e.getMessage());
}
}
}3.测试
List-5
public class Main {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new BillingModule());
BillingService billingService = injector.getInstance(BillingService.class);
billingService.chargeOrder(new PizzaOrder(), new CreditCard());
}
}List-5的运行结果如下图1所示:
图1 List-5的运行结果
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原始发表：2018/09/10 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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