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) })复制代码
```
- 需在application启动类同层添加接口类ExcludeFromComponentScan.java：
```
package com.mmzs.cloud;public @interface ExcludeFromComponentScan {}复制代码
```
- 并在ExcludeFromComponentScan.class接口添加注解@ExcludeFromComponentScan;并且注释如下内容：
```
@Autowired IClientConfig config;复制代码
```

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) })复制代码

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
    
      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());	}复制代码

==正确用法==

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