微服务架构——笔记（2）

一、客户客户端模块

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文章来源B站视频
尚硅谷SpringCloud框架开发教程(SpringCloudAlibaba微服务分布式架构丨Spring Cloud)教程
本次笔记内容为消费者订单Module模块

1.1 项目名称、目录结构

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1.2 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">
<parent>
    <groupId>com.atliangstar.springcloud</groupId>
    <artifactId>cloud2023</artifactId>

    <version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

    <artifactId>could_coustmer_order80</artifactId>

<dependencies>
    <!--图形化的监控展现必须有-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>

    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.0</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.10</version>
    </dependency>
</dependencies>

</project>

1.3 application.yml文件

server:
  port: 80

1.4 entities

1.4.1 Payment.java

package com.liangstar.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.ibatis.annotations.Mapper;

import java.io.Serializable;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Mapper
public class Payment implements Serializable {
    private Long id;
    private String serial;
}

1.4.2 CommonResult.java

package com.liangstar.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@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);
    }
}

1.5 两服务间调用

1.order订单微服务调用的是8001
2.两个端口两个服务，不需要 dao，service，impl的实现
3.两个服务间的调用
4.原始web阶段为httpClient
5.现在需要使用restTemplate给httpClient进行封装，实现横向微服务调用
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1.5.1 RestTemplate

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
完成80–>8001远程调用

https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html

调用起来三个方法
（url，requestMap，ResponseBean.class）这三个参数分别代表为Rest请求地址、请求参数、Http响应转换被转换成的对象类型。
注入到spring容器中

1.6 controller

package com.liangstar.springcloud.controller;

import com.liangstar.springcloud.entities.CommonResult;
import com.liangstar.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.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
@Slf4j
public class OrderController {
    public static final String PAYMENT_URL = "http://localhost:8081";

    @Resource
    private RestTemplate restTemplate;


    @PostMapping(value="/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        log.info("消费者consumer创建启动");
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping(value="/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
        log.info("消费者consumer查询启动");
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }
}