使用Template实现分布式架构之间通信的demo

首先创建一个 springboot 父项目

<?xml version="1.0" encoding="UTF-8"?>

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    4.0.0
    
        order
        stock
    
    
        
        org.springframework.boot
        spring-boot-starter-parent
        2.6.1
         
    
    com.example
    springcloudalibaba
    0.0.1-SNAPSHOT
    springcloudalibaba
    
    pom
    springcloudalibaba
    
        1.8
    

    
        
        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

在这个项目下创建子 maven 项目

<?xml version="1.0" encoding="UTF-8"?>

         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">
    
        springcloudalibaba
        com.example
        0.0.1-SNAPSHOT
    
    4.0.0

    order
    商品订单模块

    
        8
        8
    

    
        
        
            org.springframework.boot
            spring-boot-starter-web
        
    

<?xml version="1.0" encoding="UTF-8"?>

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    4.0.0
    
        order
        stock
    
    
        
        org.springframework.boot
        spring-boot-starter-parent
        2.6.1
         
    
    com.example
    springcloudalibaba
    0.0.1-SNAPSHOT
    springcloudalibaba
    
    pom
    springcloudalibaba
    
        1.8
    

    
        
        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

业务代码

order服务

/**
 * @Description:
 * @Author: LH
 * @Date: 2021/12/04/4:30 下午
 */
@SpringBootApplication
public class OrderApplication {

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

    // 用于远程调用的template，使用建造者模式
    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        RestTemplate restTemplate = builder.build();
        return restTemplate;
    }
}

/**
 * @Description:
 * @Author: LH
 * @Date: 2021/12/04/4:18 下午
 */
@RestController
@RequestMapping("/order")
public class OrderController {

    @Autowired
    RestTemplate restTemplate;

    @RequestMapping("/add")
    public String add() {
        System.out.println("下单成功！");
        String msg = restTemplate.getForObject("http://localhost:8082/stock/reduct", String.class);
        return "Hello World!" + msg;
    }

}

stock服务

/**
 * @Description:
 * @Author: LH
 * @Date: 2021/12/04/4:32 下午
 */
@SpringBootApplication
public class StockApplication {

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

/**
 * @Description:
 * @Author: LH
 * @Date: 2021/12/04/4:21 下午
 */
@RestController
@RequestMapping("/stock")
public class StockController {

    @RequestMapping("/reduct")
    public String reduct() {
        System.out.println("扣减库存");
        return "扣减库存";
    }
}

起两个服务

在浏览器输入localhot:/8081/order/add进行访问