1、在启动类中注入RestTemplate模板

在SpringBoot项目中，RestTempplate是替代HttpClient的存在，它的功能十分强大，而我们SpringCloud微服务之间的调用，最简单的方法就是通过RestTemplate来调用。

要想使用RestTemplate，那首先需要注入它，具体代码如下：

package com.mazong.serverblogarticle;

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

@SpringBootApplication
public class ServerBlogArticleApplication {

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

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

2、修改ArticleController类

在ArticleController类的接口中，我们来演示一下RestTemplate的使用方法，具体代码如下：

package com.mazong.serverblogarticle.controller;

import com.mazong.serverblogarticle.entity.TbArticle;
import com.mazong.serverblogarticle.mapper.IDbArticleMapper;
import com.mazong.serverbloguser.entity.TbUser;
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 org.springframework.web.client.RestTemplate;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

@Controller
@RequestMapping("/")
public class ArticleController {
    @Autowired
    private IDbArticleMapper iDbArticleMapper;

    @Autowired
    HttpServletRequest request;

    @Autowired
    RestTemplate restTemplate;

    @RequestMapping(value = "/getArticle")
    @ResponseBody
    public Object getArticle(@RequestParam("id") Integer id) {
        // http://localhost:9000/getArticle?id=2

        Map<String, Object> resultMap = new HashMap<>();
        TbArticle article = iDbArticleMapper.getArticle(id);
        resultMap.put("article", article);
        if(article != null) {
            TbUser user = restTemplate.getForObject("http://localhost:8000/getUser?id="+article.getUid(), TbUser.class);
            resultMap.put("user", user);
        }

        return resultMap;
    }
}

3、引入TbUser类的依赖

        <!-- 引入TbUser类的包 -->
        <dependency>
            <groupId>com.mazong</groupId>
            <artifactId>server-blog-user</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

4、编译运行

注意：由于server-blog-article服务依赖于server-blog-user服务，所以要先启动user服务，然后再启动article服务。