（1） 新增jar pom.xml

    <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>

（2）在主程式中添加註解
@EnableFeignClients

（3）編寫呼叫微服務的程式碼（呼叫服務2）
1 建立theme實體

public class Theme {
private  Integer id;
private  String  tName;
private  String  tDescription;
get  set ;
}
 

2 編寫訪問theme服務程式碼

@FeignClient(value="themeMicroService",  //服務1

fallback=Demo2ClientHystric.class  //容錯處理類 
)

public interface ThemeClient {

    @RequestMapping(value="/getThemeList",//2介面
            method=RequestMethod.GET)

    public    List<Theme>  getThemeList();//list

    @RequestMapping(value="/saveTheme",method=RequestMethod.GET)
     public int saveTheme(
             @RequestParam("tName") String tName  ,// 3傳遞引數
             @RequestParam("tDescription")  String tDescription,
             @RequestParam("blockId")   Integer blockId
             );

}
 

3 編寫錯誤處理類

@Component
public class Demo2ClientHystric implements ThemeClient {
    @Override
    public List<Theme> getThemeList() {
        // TODO Auto-generated method stub
        System.out.println("進入斷路器");
        throw new RuntimeException(" 失敗.");
    }
    // 丟出異常
    @Override
    public int saveTheme(String tName, String tDescription, Integer blockId) {
        // TODO Auto-generated method stub
        System.out.println("進入斷路器");
        throw new RuntimeException("失敗.");
    }
}
 

（4）編寫整合服務：訪問2個服務
訪問微服務1dao ，訪問微服務2

1 介面：

public interface BlockThemeService {

    int saveBlockTheme(Block block, Theme theme);

}

2 實現

//第三個微服務整合
@Service
public class BlockThemeServiceImpl {
    @Autowired
    private BlockDao blockDao; // 1區塊訪問dao—微服務1內容

    @Autowired
    private ThemeClient themeClient; // 2主題微服務訪問—微服務2的內容 

    @Transactional
    public int saveBlockTheme(Block block, Theme theme) {
            int rs1 = blockDao.saveBlock("jwg10", "111");// 3 儲存1
        int rs2 = themeClient.saveTheme("jwg11", "111", 1);// 4 儲存2
        return rs1 + rs2;
    }
}

（5）編寫控制層

 釋出整合介面

@RestController
public class BlockThemeController {
    @Autowired
    private BlockThemeService blockThemeService;
    @RequestMapping("/saveBlockTheme")
    public String saveBlockTheme() {
//呼叫整合服務
        Integer rs = blockThemeService.saveBlockTheme(null, null);
        return rs.toString();
    }
}

（6）測試

啟動註冊中心，啟動themeMicroService ，啟動BlockMicroService
啟動瀏覽器

預測結果:forum1 block 表增加 jwg10,111
Forum2 theme表增加jwg11 111