[Java知识库]spring cloud 学习 day(1）

一、基础环境

1.1 版本对应

1.2 搭建项目

1.3 项目配置

• 字符编码
  
• 注解激活生效
  

1.4 dependencemanager

1.5 跳过单元测试

1.6 mvn:install

将父工程发布到仓库中

1.7 项目当前架构

1.8 pom配置repository

<repositories>
        <repository>
            <id>central</id>
            <name>Central Repository</name>
            <url>https://repo1.maven.org/maven2/</url>
        </repository>
    </repositories>

1.9 热部署插件devtools

• 子module添加pom

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <version>2.6.7</version>
</dependency>

• 父工程设置plugin

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>

• 开启自动编译选项
  

• ctrl+alt+shift+/ -》registry
  

• 重启idea

二、微服务之间的简单调用

2.1 RestTemplate

2.1.1 restTemplate实例注入

package com.order.skill.Config;

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

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

2.1.2 通过restemPlate调用远程接口

package com.order.skill.Controller;

import com.order.skill.entities.CommenResult;
import com.order.skill.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.RequestParam;
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("/consumer/addPayment")
    public CommenResult<Payment> create(@RequestParam("serial")String serial){
        Payment payment = new Payment(serial);
        return restTemplate.postForObject(PAYMENT_URL + "/addPayment", payment, CommenResult.class);
    }
    @GetMapping("/consumer/getPayment/{id}")
    public CommenResult<Payment> getPayment(@PathVariable("id") int id){
        return restTemplate.getForObject(PAYMENT_URL + "/getPayment?id=" + id, CommenResult.class);
    }
}

2.2 远程接口,注意@RequestBody注解

package com.mypack.payment.Controller;

import com.mypack.payment.Service.PaymentService;
import com.mypack.payment.entities.CommenResult;
import com.mypack.payment.entities.Payment;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

@RestController
public class PaymentController {
    @Resource
    PaymentService paymentService;
    //postmapping好多浏览器不支持
    @PostMapping("/addPayment")
    public CommenResult addPayment(@RequestBody("serial")String serial){
        Payment payment = new Payment(serial);
        int i = paymentService.create(payment);
        if(i > 0){
            return new CommenResult(200,"successcrycry",payment);
        }else {
            return new CommenResult(500,"error");
        }

    }
    @GetMapping("/getPayment")
    public CommenResult getPayment(@RequestParam("id")int id){
        Payment payment = paymentService.getPayment(id);
        if(payment != null){
            return new CommenResult(200,"succ", payment);
        }else {
            return new CommenResult(500,"error");
        }
    }
}

2.2.1 远程接口项目结构

2.2.2 数据层接口

• Dao层

@Mapper
public interface PaymentDao {
    @Insert("insert into payment (serial) values (#{serial})")
    public int create(Payment payment);
    @Select("select * from payment where id = #{id}")
    public Payment getPayment(@Param("id")int id);
}

2.3 Spring Dashboard

2.4 数据插入数据库失败，记得加requestBody注解

• 加到方法中的字段中去

2.5 消费者模块结构目录

2.6 系统重构，相似的代码提出来

2.6.1 创建公共模块

2.6.2 公共模块的pom

<dependencies>
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>2.2.2.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <!--spring cloud Hoxton.SR1-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Hoxton.SR1</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>

2.6.3 在comm模块使用mvn clean，mvn install点击闪电标志

• mvn clean结果

2.6.4 删除冗余的代码，引入公共模块的

三、出错

3.1 dashboard出不来

• idea 项目名右键->show in explorer
• 点进自己的项目->.idea->workspace.xml
• 添加相关配置
  

3.2 Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project CommModule: Fatal error compiling

• 主项目的pom中mvn的版本与jdk要对应起来

<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>

3.3 There was an unexpected error (type=Internal Server Error, status=500).400 : [{“timestamp”:“2022-05-20T07:47:42.395+0000”,“status”:400,“error”:“Bad Request”,“message”:“Required String parameter ‘serial’ is not present”,“trace”:"org.springframework.web.bind.MissingServletRequest… (6011 bytes)]

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