Spring Boot Rest模板

黑洞代码

发布于 2021-09-03 15:07:12

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发布于 2021-09-03 15:07:12

Rest模板用于创建使用RESTful Web服务的应用程序。使用exchange()方法为所有HTTP方法使用Web服务。下面给出的代码显示了如何创建Rest模板Bean以自动连接Rest模板对象。

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

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

GET

通过使用RestTemplate类的exchange()方法来使用GET API，假设此URL => http://localhost:8080/products返回以下JSON，将使用以下代码使用Rest Template来使用此API响应 -

[
   {
      "id": "1",
      "name": "Honey"
   },
   {
      "id": "2",
      "name": "Almond"
   }
]

必须遵循给定的点来使用API -

1.自动装配Rest模板对象。2.使用HttpHeaders设置请求标头。3.使用HttpEntity包装请求对象。4.为Exchange()方法提供URL，HttpMethod和Return类型。

@RestController
public class ConsumeWebService {
   @Autowired
   RestTemplate restTemplate;

   @RequestMapping(value = "/template/products")
   public String getProductList() {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity <String> entity = new HttpEntity<String>(headers);

      return restTemplate.exchange("
         http://localhost:8080/products", HttpMethod.GET, entity, String.class).getBody();
   }
}

POST

通过使用RestTemplate的exchange()方法来使用POST API，假设此URL => http://localhost:8080/products 返回如下所示的响应，使用Rest模板测试此API响应。下面给出的代码是请求正文。

{
   "id":"3",
   "name":"Ginger"
}

下面给出的代码是响应内容。

Product is created successfully

需要遵循以下给出的要点来使用API。

1.自动装配Rest模板对象。2.使用HttpHeaders设置请求标头。3.使用HttpEntity包装请求对象。在这里将Product对象包装起来以将其发送到请求主体。

为exchange()方法提供URL，HttpMethod和Return类型。

@RestController
public class ConsumeWebService {
   @Autowired
   RestTemplate restTemplate;

   @RequestMapping(value = "/template/products", method = RequestMethod.POST)
   public String createProducts(@RequestBody Product product) {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<Product> entity = new HttpEntity<Product>(product,headers);

      return restTemplate.exchange(
         "http://localhost:8080/products", HttpMethod.POST, entity, String.class).getBody();
   }
}

PUT

通过使用RestTemplate的exchange()方法来使用PUT API。假设此URL=> http://localhost:8080/products/3 返回以下响应，使用RestTemplate来响应此API。下面给出的代码是请求主体。

{
   "name":"Huawei"
}

下面给出的代码是响应结果。

Product is updated successfully

必须遵循以下给出的要点来使用API -

1.自动装配Rest模板对象。2.使用HttpHeaders设置请求标头。3.使用HttpEntity包装请求对象。在这里将Product对象包装起来以将其发送到请求主体。

exchange()方法提供URL，HttpMethod和Return类型。

@RestController
public class ConsumeWebService {
   @Autowired
   RestTemplate restTemplate;

   @RequestMapping(value = "/template/products/{id}", method = RequestMethod.PUT)
   public String updateProduct(@PathVariable("id") String id, @RequestBody Product product) {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<Product> entity = new HttpEntity<Product>(product,headers);

      return restTemplate.exchange(
         "http://localhost:8080/products/"+id, HttpMethod.PUT, entity, String.class).getBody();
   }
}

DELETE

通过使用RestTemplate的 exchange()方法来使用DELETE API，假设此URL => http://localhost:8080/products/3 返回下面给出的响应，将使用RestTemplate来使用此API响应。下面显示的这行代码是响应正文。

Product is deleted successfully

必须按照下面显示的点来使用API。

1.自动装配Rest模板对象。2.使用HttpHeaders设置请求标头。3.使用HttpEntity包装请求对象。

为exchange()方法提供URL，HttpMethod和Return类型。

@RestController
public class ConsumeWebService {
   @Autowired
   RestTemplate restTemplate;

   @RequestMapping(value = "/template/products/{id}", method = RequestMethod.DELETE)
   public String deleteProduct(@PathVariable("id") String id) {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<Product> entity = new HttpEntity<Product>(headers);

      return restTemplate.exchange(
         "http://localhost:8080/products/"+id, HttpMethod.DELETE, entity, String.class).getBody();
   }
}

完整的Rest Template控制器类文件如下。

import java.util.Arrays;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import com.yiibai.demo.model.Product;

@RestController
public class ConsumeWebService {
   @Autowired
   RestTemplate restTemplate;

   @RequestMapping(value = "/template/products")
   public String getProductList() {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<String> entity = new HttpEntity<String>(headers);

      return restTemplate.exchange(
         "http://localhost:8080/products", HttpMethod.GET, entity, String.class).getBody();
   }
   @RequestMapping(value = "/template/products", method = RequestMethod.POST)
   public String createProducts(@RequestBody Product product) {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<Product> entity = new HttpEntity<Product>(product,headers);

      return restTemplate.exchange(
         "http://localhost:8080/products", HttpMethod.POST, entity, String.class).getBody();
   }
   @RequestMapping(value = "/template/products/{id}", method = RequestMethod.PUT)
   public String updateProduct(@PathVariable("id") String id, @RequestBody Product product) {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<Product> entity = new HttpEntity<Product>(product,headers);

      return restTemplate.exchange(
         "http://localhost:8080/products/"+id, HttpMethod.PUT, entity, String.class).getBody();
   }
   @RequestMapping(value = "/template/products/{id}", method = RequestMethod.DELETE)
   public String deleteProduct(@PathVariable("id") String id) {
      HttpHeaders headers = new HttpHeaders();
      headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
      HttpEntity<Product> entity = new HttpEntity<Product>(headers);

      return restTemplate.exchange(
         "http://localhost:8080/products/"+id, HttpMethod.DELETE, entity, String.class).getBody();
   }
}

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原始发表：2021-08-06，如有侵权请联系 cloudcommunity@tencent.com 删除

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