汇率服务
汇率服务服务提供者,汇率服务主要提供汇不同货币之间的汇率值。比如美元兑人民币是1:6.8,欧元兑卢比是1:75。
汇率服务接收的请求和返回分别是:
{
id: 10002,
from: "EUR",
to: "INR",
conversionMultiple: 75,
port: 8000,
}
上述例子中请求的是欧元兑卢比的汇率值,返回的汇率是75
创建货币交换实体
@Entity
public class ExchangeValue {
@Id
private Long id;
@Column(name="currency_from")
private String from;
@Column(name="currency_to")
private String to;
private BigDecimal conversionMultiple;
private int port;
public ExchangeValue() {
}
public ExchangeValue(Long id, String from, String to, BigDecimal conversionMultiple) {
super();
this.id = id;
this.from = from;
this.to = to;
this.conversionMultiple = conversionMultiple;
}
public Long getId() {
return id;
}
public String getFrom() {
return from;
}
public String getTo() {
return to;
}
public BigDecimal getConversionMultiple() {
return conversionMultiple;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
}
重要说明:
- @Entity:指定实体类,这个标签用于这个类
- @Id: 指定这个实体的主键
创建货币交换JPA仓库
package com.zhg.springboot.microservice.example.forex;
import org.springframework.data.jpa.repository.JpaRepository;
public interface ExchangeValueRepository extends
JpaRepository<ExchangeValue, Long>{
ExchangeValue findByFromAndTo(String from, String to);
}
说明:
- public interface ExchangeValueRepository extends JpaRepository<ExchangeValue, Long>
继承JpaRepository,用到了两个泛型,ExchangeValue和Long,ExchangeValue是被管理的实体类型,Long是这个实体ExchangeValue的主键的类型 - ExchangeValue findByFromAndTo(String from, String to)
查询从一种货币到一种货币的汇率.
创建控制器-ForexController
@RestController
public class ForexController {
@Autowired
private Environment environment;
@Autowired
private ExchangeValueRepository repository;
@GetMapping("/currency-exchange/from/{from}/to/{to}")
public ExchangeValue retrieveExchangeValue
(@PathVariable String from, @PathVariable String to){
ExchangeValue exchangeValue =
repository.findByFromAndTo(from, to);
exchangeValue.setPort(
Integer.parseInt(environment.getProperty("local.server.port")));
return exchangeValue;
}
}
说明:
- @RestController
用于定义一个 控制器,暴露rest服务 - @Autowired private Environment environment
用于从当前运行环境中取出服务端口号 - @Autowired private ExchangeValueRepository repository
注册仓库 - ExchangeValue exchangeValue = repository.findByFromAndTo(from, to)
从数据库中得到ExchangeValue - exchangeValue.setPort(Integer.parseInt(environment.getProperty("local.server.port")))
设置exchangeValue中的port值 - environment.getProperty("local.server.port")
从当前运行环境中取出服务端口号
配置文件
spring.application.name=forex-service
server.port=8000
spring.jpa.show-sql=true
spring.h2.console.enabled=true
往数据库插入一些数据
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10001,'USD','INR',65,0);
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10002,'EUR','INR',75,0);
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10003,'AUD','INR',25,0);
测试汇率微服务
{
id: 10002,
from: "EUR",
to: "INR",
conversionMultiple: 75,
port: 8000,
}
完整代码
- pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.in28minutes.springboot.microservice.example.forex</groupId>
<artifactId>spring-boot-microservice-forex-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-boot-microservice-forex-service</name>
<description>Microservices with Spring Boot and Spring Cloud - Forex Service</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.M8</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
- /spring-boot-microservice-forex-service/src/main/java/com/zhg/springboot/microservice/example/forex/ExchangeValue.java
package com.zhg.springboot.microservice.example.forex;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class ExchangeValue {
@Id
private Long id;
@Column(name="currency_from")
private String from;
@Column(name="currency_to")
private String to;
private BigDecimal conversionMultiple;
private int port;
public ExchangeValue() {
}
public ExchangeValue(Long id, String from, String to, BigDecimal conversionMultiple) {
super();
this.id = id;
this.from = from;
this.to = to;
this.conversionMultiple = conversionMultiple;
}
public Long getId() {
return id;
}
public String getFrom() {
return from;
}
public String getTo() {
return to;
}
public BigDecimal getConversionMultiple() {
return conversionMultiple;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
}
- /spring-boot-microservice-forex-service/src/main/java/com/zhg/springboot/microservice/example/forex/ExchangeValueRepository.java
package com.zhg.springboot.microservice.example.forex;
import org.springframework.data.jpa.repository.JpaRepository;
public interface ExchangeValueRepository extends
JpaRepository<ExchangeValue, Long>{
ExchangeValue findByFromAndTo(String from, String to);
}
- /spring-boot-microservice-forex-service/src/main/java/com/zhg/springboot/microservice/example/forex/ForexController.java
package com.zhg.springboot.microservice.example.forex;
import java.math.BigDecimal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ForexController {
@Autowired
private Environment environment;
@Autowired
private ExchangeValueRepository repository;
@GetMapping("/currency-exchange/from/{from}/to/{to}")
public ExchangeValue retrieveExchangeValue
(@PathVariable String from, @PathVariable String to){
ExchangeValue exchangeValue =
repository.findByFromAndTo(from, to);
exchangeValue.setPort(
Integer.parseInt(environment.getProperty("local.server.port")));
return exchangeValue;
}
}
- /spring-boot-microservice-forex-service/src/main/java/com/zhg/springboot/microservice/example/forex/SpringBootMicroserviceForexServiceApplication.java
package com.zhg.springboot.microservice.example.forex;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringBootMicroserviceForexServiceApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootMicroserviceForexServiceApplication.class, args);
}
}
- application.properties
spring.application.name=forex-service
server.port=8000
spring.jpa.show-sql=true
spring.h2.console.enabled=true
- data.sql
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10001,'USD','INR',65,0);
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10002,'EUR','INR',75,0);
insert into exchange_value(id,currency_from,currency_to,conversion_multiple,port)
values(10003,'AUD','INR',25,0);
- /spring-boot-microservice-forex-service/src/test/java/com/in28minutes/springboot/microservice/example/forex/SpringBootMicroserviceForexServiceApplicationTests.java
package com.in28minutes.springboot.microservice.example.forex;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootMicroserviceForexServiceApplicationTests {
@Test
public void contextLoads() {
}
}