再讲dubbo

Posted 2020-10-17 CTO老王

开始前，先看一下demo项目工程结构：

1、抽离接口

dubbo-api工程，根据业务抽离接口，deploy到mave nexus。

public interface TestService {
    /**
     * @param name
     * @return
     */
    public String sayHello(String name);
    /**
     * @param cmd
     * @return
     */
    public String linuxCMD(String cmd);

}

提供三维坐标：

<dependency>
  <groupId>com.dubbo</groupId>
  <artifactId>dubbo-api</artifactId>
  <version>0.0.1-SNAPSHOT</version>
</dependency>

2、提供者和消费者并行

dubbo-service工程pom引入实现接口三维坐标实现接口。

import com.dubbo.service.TestService;
import com.dubbo.common.TestLinuxCmd;
public class TestServiceImpl implements TestService {  
    @Override
    public String sayHello(String name)  { 
                // TODO Auto-generated method stub
        return null;        
    }
    @Override
    public String linuxCMD(String cmd) {
        String exec = TestLinuxCmd.exec("192.168.20.20", "root", "123456", 22, name);
        return exec;
    }
}

注：TestLinuxCmd方法来至dubbo-common工程，公共方法到放到这里，就不多做解释了。

写完服务记得暴露出服务：

<dubbo:service interface="com.dubbo.service.TestService" ref="testService" />

dubbo-controller工程pom同样也要引入实现接口三维坐标，调用这个接口。

package com.dubbo.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.dubbo.service.TestService;
@Controller
public class MyController {
    @Autowired
    private TestService testService;
    @RequestMapping(value = "/test")
    @ResponseBody
    public String testSay(@RequestParam(value = "name",defaultValue = "") String name){
        StringBuffer sb = new StringBuffer();
        sb.append("Dubbo: ").append(testService.sayHello(name));
        return sb.toString();
    }
}

消费者不需要关心谁提供的服务，它只需要调用三维坐标的接口即可。

写完同样记得暴露出服务：

    <dubbo:reference interface="com.dubbo.service.TestService" id="testService" check="false" />

 源码下载：

https://files.cnblogs.com/files/Javame/dubbo.zip