required a bean of type ‘org.springframework.web.client.RestTemplate‘ that could not be found 解决方法

矫情吗；* 2023-09-30 07:21 3阅读 0赞

在使用 SpringBoot 时不能自动注入 RestTemplate，具体报错信息如下

Field restTemplate in 'xxx' required a bean of type 'org.springframework.web.client.RestTemplate' that could not be found.
    
    The injection point has the following annotations:
    	- @org.springframework.beans.factory.annotation.Autowired(required=true)
    Action:
    Consider defining a bean of type 'org.springframework.web.client.RestTemplate' in your configuration.

**原因：**  
在 SpringBoot 1.3 及以前的版本中，会默认提供一个 RestTemplate 的实例 Bean，而在 SpringBoot 1.4 及以后的版本中，这个默认的 bean 不再提供。

**解决方法：**

**方法1：**

在 SpringBoot 项目启动类 xxxApplication 中，设置手动引入 RestTemplate 相关配置。

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

如下：

@SpringBootApplication
    public class ImApiApplication {
        
    
        public static void main(String[] args) {
        
            SpringApplication.run(ImApiApplication.class, args);
        }
    
        @Bean
        @LoadBalanced
        RestTemplate restTemplate(){
        
            return new RestTemplate();
        }
    }

**方法2：**

创建个配置类，在配置类中手动注入 RestTemplate

import org.springframework.boot.web.client.RestTemplateBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @author 程序员大佬超
     * @date 2022-03-08 16:39
     */
    @Configuration
    public class RestConfig {
        
        @Bean
        public RestTemplate restTemplate(RestTemplateBuilder builder) {
        
            return builder.build();
        }
    }

required a bean of type ‘org.springframework.web.client.RestTemplate‘ that could not be found 解决方法

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