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:

@Beanpublic 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:

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

Using it in your class

@Autowiredprivate RestTemplate restTemplate;

or

@Injectprivate RestTemplate restTemplate;