Rest微服务案例

Posted 2021-03-23 wnwn

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数据库

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　　数据库名称为Product;

创建api子工程，项目名为springcloud_api

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　　Product实体类

public class Product implements Serializable {
    private Integer pid;

    private String productName;

    private Integer quantity;

    public Product(Integer pid, String productname, Integer quantity) {
        this.pid = pid;
        this.productName = productname;
        this.quantity = quantity;
    }

    public Product() {
        super();
    }

    public Integer getPid() {
        return pid;
    }

    public void setPid(Integer pid) {
        this.pid = pid;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public Integer getQuantity() {
        return quantity;
    }

    public void setQuantity(Integer quantity) {
        this.quantity = quantity;
    }
}

　　　　公共模块可以达到通用目的，也即需要用到部门实体的话，不用每个工程都定义一份，直接引用本模块即可。

创建生产者，名称为springcloud_provider

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　　导入依赖

<dependencies>

        <!-- mybatis-spring -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.wn</groupId>
            <artifactId>springcloud_api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>

    </dependencies>

　　application.properties文件

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql:///invoicingsystem
spring.datasource.username=root
spring.datasource.password=123

spring.jpa.show-sql=true

mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

　　dao接口层

@Repository("productDao")
public interface ProductDao {

    //查询全部
    public List<Product> getAll();

    //根据id查询列表
    public Product getid(@Param("pid") Integer pid);

}

　　dao.xml文件

<?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为映射的根节点，namespace指定Dao接口的完整类名
mybatis会依据这个接口动态创建一个实现类去实现这个接口，
而这个实现类是一个Mapper对象-->

<mapper namespace="com.wn.springcloud_provider.dao.ProductDao">
    <resultMap id="MapList" type="com.wn.springcloud_api.entity.Product">
        <id property="pid" column="pid"></id>
        <result property="productName" column="productName"></result>
        <result property="quantity" column="quantity"></result>
    </resultMap>

    <!--绑定商品名称下拉框-->
    <select id="getAll" resultType="com.wn.springcloud_api.entity.Product">
        SELECT * FROM product
    </select>

    <select id="getid" resultType="com.wn.springcloud_api.entity.Product">
        SELECT * FROM product WHERE pid=#{pid}
    </select>

</mapper>

　　service接口层

public interface ProductService {

    //查询全部
    public List<Product> getAll();

    //根据id查询列表
    public Product getid(Integer pid);

}

　　service接口实现层

@Service("productServices")
public class ProductServiceImpl implements ProductService {

    @Resource(name = "productDao")
    private ProductDao dao;

    @Override
    public List<Product> getAll() {
        return dao.getAll();
    }

    @Override
    public Product getid(Integer pid) {
        return dao.getid(pid);
    }
}

　　controller层

@Controller
@RequestMapping("/product")
public class ProductController {

    @Resource(name = "productServices")
    private ProductService service;

    //查询全部
    @RequestMapping(value = "/getAll",method = RequestMethod.GET)
    @ResponseBody
    public List<Product> getAll() {
        List<Product> all = service.getAll();
        for (Product product:all){
            System.out.println(product.getProductName());
        }
        return all;
    }

    @RequestMapping(value = "/getid/{pid}",method = RequestMethod.GET)
    @ResponseBody
    public Product getid(@PathVariable("pid") Integer pid){
        Product getid = service.getid(pid);
        return getid;
    }

}

　　启动类

@SpringBootApplication
@MapperScan("com.wn.springcloud_provider.*")
public class SpringcloudProviderApplication {

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

}

　　实现结果　

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创建消费者，名称为springcloud_consumer

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　　导入依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.wn</groupId>
            <artifactId>springcloud_api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

　　application.properties文件

server.port=8081

　　配置类

package com.wn.springcloud_consumer.Bean;

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

@Configuration
public class ConfigBean {

    @Bean
    public RestTemplate getRestTemplate(){
        return new 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

　　消费者的controller

package com.wn.springcloud_consumer.controller;

import com.wn.springcloud_api.entity.Product;
import org.springframework.beans.factory.annotation.Autowired;
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 java.util.List;

@RestController
public class ProductController {

    private static final String REST_URL_PREFIX="http://localhost:8080";

    @Autowired
    private RestTemplate restTemplate;

    //查询全部
    @SuppressWarnings("unckecked")
    @RequestMapping("/controller/product/getAll")
    public List<Product> getAll(){
        System.out.println("--------------------");
        return restTemplate.getForObject(REST_URL_PREFIX+"/product/getAll",List.class);
    }

    //根据id查询列表
    @RequestMapping("/controller/product/getid/{pid}")
    public Product getid(@PathVariable("pid") Integer pid){
        return restTemplate.getForObject(REST_URL_PREFIX+"/product/getid/"+pid,Product.class);
    }
    
}

　　启动类

@SpringBootApplication
public class SpringcloudConsumerApplication {

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

}

　　实现结果

　　　　技术图片

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