RestTemplate注入

Errors you'll see if a  RestTemplate  isn't defined
Consider defining a bean of type 'org.springframework.web.client.RestTemplate' in your configuration.
or
No qualifying bean of type [org.springframework.web.client.RestTemplate] found
How to define a  RestTemplate  via annotations
Depending on which technologies you're using and what versions will influence how you define a  RestTemplate  in your  @Configuration  class.
Spring >= 4 without Spring Boot
Simply define an  @Bean :

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

Spring Boot <= 1.3
No need to define one, Spring Boot automatically defines one for you.
Spring Boot >= 1.4
Spring Boot no longer automatically defines a  RestTemplate  but instead defines a  RestTemplateBuilder  allowing you more control over the  RestTemplate  that gets created. You can inject the  RestTemplateBuilder  as an argument in your  @Bean  method to create a  RestTemplate :

@Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) {
   // Do any additional configuration here
   return builder.build();
}

Using it in your class

@Autowired
private RestTemplate restTemplate;

or

@Inject
private RestTemplate restTemplate;