SpringCloud(四)微服务架构编码构建+ 首说RestTemplate
约定 > 配置 > 编码
Idea新建project工作空间
微服务cloud整体聚合父工程Project
1. New Project
2. 聚合总父工程名字
3.Maven选版本
4.工程名字
5.字符编码
6.注解生效激活
7.java编译版本选8
8.File Type过滤
父工程pom
<groupId>com.atguigu.springcloudgroupId>
<artifactId>cloud2020artifactId>
<version>1.0-SNAPSHOTversion>
<packaging>pompackaging>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
<junit.version>4.12junit.version>
<log4j.version>1.2.17log4j.version>
<lombok.version>1.16.18lombok.version>
<mysql.version>5.1.47mysql.version>
<druid.version>1.1.16druid.version>
<mybatis.spring.boot.version>1.3.0mybatis.spring.boot.version>
properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-dependenciesartifactId>
<version>2.2.2.RELEASEversion>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-dependenciesartifactId>
<version>Hoxton.SR1version>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>com.alibaba.cloudgroupId>
<artifactId>spring-cloud-alibaba-dependenciesartifactId>
<version>2.1.0.RELEASEversion>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>${mysql.version}version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>${druid.version}version>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>${mybatis.spring.boot.version}version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>${junit.version}version>
dependency>
<dependency>
<groupId>log4jgroupId>
<artifactId>log4jartifactId>
<version>${log4j.version}version>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>${lombok.version}version>
<optional>trueoptional>
dependency>
dependencies>
dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<configuration>
<fork>truefork>
<addResources>trueaddResources>
configuration>
plugin>
plugins>
build>
pom文件包下载失败可以去阿里云的仓库下载jar包然后手动安装到本地maven库
maven安装jar包到本地仓库
Maven工程落地细节复习
Maven中的DependencyManagement和Dependencies
Maven使用dependencyManagement元素来提供了一种管理依赖版本号的方式
通常会在一个组织或者项目的最顶层的父POM中看到dependencyManagement元素.
使用pom.xml中的dependencyManagement元素能让所有在子项目中引用一个依赖而不用显示的列出版本号.
Maven会沿着父子层次向上走, 知道找到一个拥有dependencyManagement元素的项目, 然后它就会使用这个dependencyManagement元素中指定的版本号
这样做的好处就是: 如果有多个子项目都引用同一样依赖, 则可以避免在每个使用的子项目里都声明一个版本号, 这样当想升级或切换到另一个版本时, 只需要在顶层父容器里更新, 而不需要一个一个子项目的修改; 另外如果某个子项目需要另外的一个版本, 只需要声明version即可
- dependencyManagement里只是声明依赖, 并不实现引入, 因此子项目需要显示的声明需要用的依赖
- 如果不在子项目中声明依赖, 是不会从父项目中继承下来的; 只有在子项目中写了该依赖项, 并且没有指定具体版本, 才会从父项目中继承该项, 并且version和scope都读取自父pom
- 如果子项目中指定了版本号, 那么会使用子项目中指定的jar版本
maven中跳过单元测试
父工程创建完成执行mvn:install 将父工程发布到仓库方便子工程继承
执行maven的clean 和install
Rest微服务工程构建
微服务模块构建步骤
- 建module
- 改pom
- 写yml
- 主启动
- 业务类
cloud-provider-payment8001微服务提供者支付Module模块
1. 建cloud-provider-payment8001 创建完后请回到父工程查看pom文件变化, 还需要把
2. 改pom
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-actuatorartifactId>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druid-spring-boot-starterartifactId>
<version>1.1.10version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jdbcartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
<scope>runtimescope>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
3. 写yml 在如图位置新建文件application.yml注意数据库连接的用户名密码写自己的还有连接哪个数据库
server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: org.gjt.mm.mysql.Driver
url: jdbc:mysql://localhost:3306/cloud2020?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.atguigu.springcloud.entities
4. 主启动 在java下新建包名与类名如下
编写启动文件
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @author YangJunyi
*/
@SpringBootApplication
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class, args);
}
}
5. 业务类
1. 建表SQL
create table `payment`(
`id` bigint(20) not null auto_increment COMMENT 'ID',
`serial` varchar(200) DEFAULT '',
PRIMARY KEY(`id`)
)ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
2. entities 创建主实体Payment 和Json封装体CommonResult
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
/**
* @author yangjunyi
* @create 2020-07-23 14:09
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
private Long id;
private String serial;
}
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author YangJunYi
* @create 2020/7/23 14:12
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
private Integer code;
private String message;
private T data;
public CommonResult(Integer code, String message){
this(code,message,null);
}
}
3. dao
import com.itguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
/**
* @author YangJunYi
* @create 2020/7/23 14:18
*/
@Mapper
public interface PaymentDao {
int create(Payment payment);
Payment getPaymentById(@Param("id") Long id);
}
在这里,我遇到了一个严重问题,@Mapper注解和@Param注解全都导入不进来, 通过百度查询官网,
官方推荐SpringBoot 2.1及以上版本使用MyBatis-Spring-Boot-Starter的2.1以上版本,所以我去父工程中把pom文件的properties标签中的mybatis-springboot-starter的版本改成了2.1.3,那两个注解就可以正常使用了
然后在resource下写mybatis对应的xml文件
mapper文件
<mapper namespace="com.atguigu.springcloud.dao.PaymentDao">
<insert id="create" parameterType="com.atguigu.springcloud.dao.PaymentDao" useGeneratedKeys="true" keyProperty="id">
insert into payment(serial) values (#{serial})
insert>
<resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
<id column="id" property="id" jdbcType="BIGINT"/>
<result column="serial" property="serial" jdbcType="VARCHAR"/>
resultMap>
<select id="getPaymentById" parameterType="long" resultMap="BaseResultMap">
select * from payment where id = #{id}
select>
mapper>
4. service
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;
/**
*@author YangJunYi
*@create 2020/7/23 15:12
*/
public interface PaymentService {
int create(Payment payment);
Payment getPaymentById(@Param("id") Long id);
}
import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* @author YangJunYi
* @create 2020/7/23 15:13
*/
@Service
public class PaymentServciceImpl implements PaymentService {
@Resource
private PaymentDao paymentDao;
@Override
public int create(Payment payment) {
return paymentDao.create(payment);
}
@Override
public Payment getPaymentById(Long id) {
return paymentDao.getPaymentById(id);
}
}
5. controller
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
/**
* Class PaymentController ...
* @author YangJunyi
* @date 2020/7/23
*/
@RestController
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
@PostMapping("/payment/create")
public CommonResult create(@RequestBody Payment payment){
int result = paymentService.create(payment);
log.info("*********插入结果: result:{}",result);
if(result > 0){
return new CommonResult(200,"插入数据库成功",result);
}else{
return new CommonResult(444,"插入数据库失败");
}
}
@GetMapping("/payment/get/{id}")
public CommonResult getPaymentById(@PathVariable("id") Long id){
Payment payment = paymentService.getPaymentById(id);
log.info("*********插入结果: payment:{}",payment);
if(payment != null){
return new CommonResult(200,"插入数据库成功", payment);
}else{
return new CommonResult(444,"没有对应记录");
}
}
}
6. 测试
使用postman测试
热部署Devtools
Adding devtools to your project 粘贴到当前8001工程(目前已经有了)
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
<scope>runtimescope>
<optional>trueoptional>
dependency>
Adding plugin to your pom.xml 粘贴到父工程pom(目前已经有了)
<build>
<finalName>cloud2020finalName>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<configuration>
<fork>truefork>
<addResources>trueaddResources>
configuration>
plugin>
plugins>
build>
Enabling automatic build
Update the value of
- 按下
CTRL + SHIFT + ALT + /点击Registry
重启IDEA
注意: 我的IDEA需要修改完代码后按CTRL + S才会自动热部署
cloud-consumer-order80微服务消费者订单Module模块
建module cloud-consumer-order80
改pom
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-actuatorartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
<scope>runtimescope>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
写yml
server:
port: 80
spring:
application:
name: cloud-consumer-order
主启动
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Class OrderMain80 ...
* @author YangJunyi
* @date 2020/7/23
*/
@SpringBootApplication
public class OrderMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderMain80.class, args);
}
}
业务类
entities
复用上一个工程的, 直接拷贝
首说RestTemplate
是什么
RestTemplate提供了多种便捷访问远程HTTP服务的方法, 是一种简单便捷的访问restful服务模板类, 是Spring提供的用于访问Rest服务的客户端模板工具集
官网及使用
官网地址
使用
使用restTemplate访问restful接口非常的简单粗暴无脑
(url, requestMap, ResponseBean.class)这三个参数分别代表
Rest请求地址, 请求参数, Http响应转换被转换成的对象类型
详细使用介绍
config配置类ApplicationContextConfig
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
/**
* Class ApplicationContextConfig ...
* @author YangJunyi
* @date 2020/7/23
*/
@Configuration
public class ApplicationContextConfig {
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
controller
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
/**
* Class OrderController ...
* @author YangJunyi
* @date 2020/7/23
*/
@RestController
@Slf4j
public class OrderController {
public static final String PAYMENT_URL = "http://localhost:8001";
@Resource
private RestTemplate restTemplate;
@GetMapping("/consumer/payment/create")
public CommonResult<Payment> create(Payment payment){
return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);
}
@GetMapping("/consumer/payment/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
}
}
测试
IDEA如何手动开启RunDashboard
在这个下面加入, 上图已经加过了,然后重启IDEA即可
<option name="configurationTypes">
<set>
<option value="SpringBootApplicationConfigurationType" />
set>
option>
工程重构
目前问题, 系统中有重复的entities部分, 所以需要重构
新建工程cloud-api-commons
POM
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
<scope>runtimescope>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>cn.hutoolgroupId>
<artifactId>hutool-allartifactId>
<version>5.1.0version>
dependency>
dependencies>
entities 直接复制, 并把前两个中的entities删除
maven命令clean install
订单80和支付8001分别改造
- 删除各自的原先有过的entities文件夹
- 各自粘贴POM内容
<dependency>
<groupId>com.atguigu.springcloudgroupId>
<artifactId>cloud-api-commonsartifactId>
<version>${project.version}version>
dependency>