【全棧之路】微服務課程2_微服務搭建

用戶服務搭建

• IDEA建立用戶服務（File->new->project）

• 項目目錄

• pom文件配置

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dream</groupId>
    <artifactId>shop-provider-user</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>shop</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR3</spring-cloud.version>
        <mybatisplus-spring-boot-starter.version>1.0.5</mybatisplus-spring-boot-starter.version>
        <mybatis-plus.version>2.3</mybatis-plus.version>
        <fastjson.version>1.2.47</fastjson.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-function-context</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </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>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatisplus-spring-boot-starter</artifactId>
            <version>${mybatisplus-spring-boot-starter.version}</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generate</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </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>

</project>

• 相關代碼

application.xml

server:
  # 指定Tomcat端口
  port: 8000

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/shop?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=UTC
    username: root
    password: root
    db-name: shop
    filters: wall,mergeStat


mybatis-plus:
  mapper-locations: classpath:mapping/*.xml
  typeAliasesPackage: com.dream.shop.model
  configuration:
    map-underscore-to-camel-case: true
    #打印sql
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

logging:
  level:
    root: INFO
    # 配置日誌級別

MybatisPlusConfig.java

package com.dream.shop.config;

import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * MybatisPlus配置
 *
 * @author rain
 */
@Configuration
@MapperScan(basePackages = {"com.dream.shop.dao"})
public class MybatisPlusConfig {

    /**
     * mybatis-plus分頁插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

UserController.java

package com.dream.shop.controller;

import com.dream.shop.dao.UserMapper;
import com.dream.shop.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.Optional;

/**
 * @author rain
 */
@RequestMapping("/users")
@RestController
public class UserController {
  @Resource
  public UserMapper userMapper;

  @GetMapping("/{id}")
  public User findById(@PathVariable Long id) {
    return this.userMapper.selectById(id);
  }
}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.dream.shop.dao.UserMapper">

    <!-- 通用查詢映射結果 -->
    <resultMap id="BaseResultMap" type="com.dream.shop.model.User">
        <id column="id" property="id" />
        <result column="username" property="username" />
        <result column="name" property="name" />
        <result column="age" property="age" />
        <result column="balance" property="balance" />
    </resultMap>

    <!-- 通用查詢結果列 -->
    <sql id="Base_Column_List">
        id,username, name, age, balance
    </sql>

</mapper>

UserMapper.java

package com.dream.shop.dao;

import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.dream.shop.model.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

/**
 * <p>
 * 用戶 Mapper 接口
 * </p>
 *
 * @author it-park-team
 * @since 2018-11-29
 */
//@Mapper
public interface UserMapper extends BaseMapper<User> {
}

User.java

package com.dream.shop.model;

import com.baomidou.mybatisplus.annotations.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import java.math.BigDecimal;

/**
 * @author rain
 */
@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("user")
public class User {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;
  @Column
  private String username;
  @Column
  private String name;
  @Column
  private Integer age;
  @Column
  private BigDecimal balance;
}

啓動
http://localhost:8000/users/1

{"id":1,"username":"rain","name":"rain","age":18,"balance":2.0}

電影微服務搭建

• IDEA建立同上（忽略）
• ** 項目目錄

• 核心代碼

MovieApplication.java

package com.dream.shop;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication//(scanBasePackages = {"com.dream.shop"})
public class MovieApplication {

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

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

}

MovieController.java

package com.dream.shop.controller;

import com.dream.shop.dao.UserMapper;
import com.dream.shop.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.util.Optional;

/**
 * @author rain
 */
@RequestMapping("/movies")
@RestController
public class MovieController {
  @Autowired
  private RestTemplate restTemplate;

  @GetMapping("/users/{id}")
  public User findById(@PathVariable Long id) {
    // 這裏用到了RestTemplate的佔位符能力
    User user = this.restTemplate.getForObject("http://localhost:8000/users/{id}", User.class, id);
    // ...電影微服務的業務...
    return user;
  }
}

服務啓動
http://localhost:8010/movies/users/1

{"id":1,"username":"rain","name":"rain","age":18,"balance":2.0}

注意事項

• @Autowired報警

解決方案:

1.使用@Resource

2.增長@Mapper註解

3.增長@MapperScan(basePackages = {"com.dream.shop.dao"})

存在問題

• 無監控，無畫板，無指標，無可視化Dashboard
• 地址硬編碼問題