[Java知识库]SpringCloud进阶-消费者模块 +工程重构

一、消费者订单模块（上）

1、创建名为cloud-consumer-order80的消费者订单模块

2、改pom.xml

order消费者模块下的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>
        <artifactId>cloud2022</artifactId>
        <groupId>com.atguidu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-order80</artifactId>

    <dependencies>
        <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>

        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>



</project>

3、application.yml

application.yml:

server:
  port: 80

4、主启动类

OrderMain80.java:

package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class OrderMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class,args);
    }
}

5、业务类

1、实体类需要使用，entities：

Payment.java

package com.atguigu.springcloud.entities;

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

import java.io.Serializable;

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

CommonResult.java

package com.atguigu.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;

    /**
     * data可能为null
     * @param code
     * @param message
     */
    public CommonResult(Integer code, String message){
        this(code, message, null);
    }
}

2、消费者需要一个controller即可


3、RestTemplate

6、RestTemplate

1、新建一个ApplicationContextConfig类，在config包下

2、修改ApplicationContextConfig类

ApplicationContextConfig.java

package com.atguigu.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ApplicationContextConfig {
    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

3、在OrderController里使用

OrderController.java

package com.atguigu.springcloud.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;

@RestController
@Slf4j
public class OrderController {
    @Resource
    private RestTemplate restTemplate;

    public static final String PAYMENT_URL = "http://localhost:8001";

    @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);
    }

}

4、测试
启动8001和80，
8001 ok

80端口ok:

二、消费者订单模块（下）

1、完善写操作

浏览器 - http://localhost/consumer/payment/create?serial=111

虽然，返回成功，但是观测数据库中，并没有创建serial为111的行。

解决之道：在cloud-provider-payment8001工程的PaymentController中添加@RequestBody注解。

PaymentController.java:

package com.atguigu.springcloud.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.*;
import javax.annotation.Resource;

/**
 */
@RestController
@Slf4j
@RequestMapping("/payment")
public class PaymentController{
    @Resource
    private PaymentService paymentService;

    @PostMapping(value = "/create")
    public CommonResult create(@RequestBody Payment payment)
    {
        int result = paymentService.create(payment);
        log.info("*****插入结果："+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",null);
        }
    }

    @GetMapping(value = "/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id)
    {
        Payment payment = paymentService.getPaymentById(id);

        if(payment != null)
        {
            return new CommonResult(200,"查询成功",payment);
        }else{
            return new CommonResult(444,"没有对应记录,查询ID: "+id,null);
        }
    }
}

2、开启Run DashBoard

通过修改idea的workspace.xml的方式来快速打开Run Dashboard窗口（这个用来显示哪些Spring Boot工程运行，停止等信息。
我idea 2020.1版本在名为Services窗口就可以显示哪些Spring Boot工程运行，停止等信息出来，所以这仅作记录参考）。

2、开启Run DashBoard

• 打开工程路径下的.idea文件夹的workspace.xml

• 在<component name="RunDashboard">中修改或添加以下代码：

<option name="configurationTypes">
	<set>
		<option value="SpringBootApplicationConfigurationType"/>
    </set>
</option>

由于idea版本差异，可能需要关闭重启。



目前我的idea里没有这个东西，据说现在是下方的services

三、工程重构

新建cloud-api-commons
1.建module
2.改pom
3.写yml

1、观察问题

系统中有重复部分，重构

2、cloud-api-commons

创建名为cloud-api-commons的module


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>
        <artifactId>cloud2022</artifactId>
        <groupId>com.atguidu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-api-commons</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.1.0</version>
        </dependency>
    </dependencies>


</project>

3、 将entities拷贝到commons模块

Payment.java

package com.atguigu.springcloud.entities;

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

import java.io.Serializable;

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

CommonResult.java

package com.atguigu.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;

    /**
     * data可能为null
     * @param code
     * @param message
     */
    public CommonResult(Integer code, String message){
        this(code, message, null);
    }
}

4、用maven打包，发布上传到公用本地库，供其他工程调用。

maven -> clean -> install

5、对订单模块和支付模块分别改造

1.删除各自原先有的entities文件夹
2.各自引入自定义的commons包

<dependency>
            <groupId>com.atguidu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>

3.测试运行

目前工程样图: