SpringCloud(一):深入理解Eureka

Ribbon的自定义配置(java代码方式)生效条件

• 第一种方式：将TestConfiguration类放在application启动类上层
  

• 第二种方式：将TestConfiguration类放在application启动类同层及以下，
  

  • 需在application启动类上添加注解

    @ComponentScan(excludeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION, value = ExcludeFromComponentScan.class) })

  • 需在application启动类同层添加接口类ExcludeFromComponentScan.java：

    package com.mmzs.cloud;
    
    public @interface ExcludeFromComponentScan {
    
    }

  • 并在ExcludeFromComponentScan.class接口添加注解@ExcludeFromComponentScan;并且注释如下内容：

    @Autowired
    IClientConfig config;

Ribbon的注意事项

0、Ribbon的自定义配置优先级：

配置文件>java代码>默认配置

1、自定义配置时，@Configuration和@ComponentScan包不应重叠

• 示例：

  @RibbonClient(name = "microservice-provider-user", configuration = TestConfiguration.class)
  @ComponentScan(excludeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION, value = ExcludeFromComponentScan.class) })

2、使用RestTemplate时，想要获得一个List时，应该用数组，而不应该直接用List

• ==错误用法==

List<User> users = this.restTemplate.getForObject("http://microservice-provider-user/list-all/", List.class);  
   for (User user : users) {
	System.out.println("輸出：" + user.getId() + "+" + user.getUsername());
}

• ==正确用法==

  User[] users = this.restTemplate.getForObject("http://microservice-provider-user/list-all", User[].class);
  List<User> lists = Arrays.asList(users);
  for (User user : lists) {
  	System.out.println("輸出：" + user.getId() + "+" + user.getUsername());
  }