springboot学习笔记(十二) RestTemplate

springboot学习笔记(十二)

使用RestTemplate消费服务

• 导入 pom 依赖

  
      org.springframework.boot
      spring-boot-starter-parent
      1.5.7.RELEASE
  
  
      
  
      
          org.springframework.boot
          spring-boot-starter
      
      
          org.springframework.boot
          spring-boot-starter-web
      
  
      
          com.fasterxml.jackson.core
          jackson-databind
      
  
  
  

• 构建一个程序入口

  @SpringBootApplication
  public class RestTemplateApp {
  
      Logger log = LoggerFactory.getLogger(RestTemplateApp.class);
  
      public static void main(String[] args) {
          new SpringApplicationBuilder(RestTemplateApp.class).build().run(args);
      }
  
      @Bean
      public RestTemplate setRestTemplate(RestTemplateBuilder builder){
              return builder.build();
      }
  
      @Bean
      public CommandLineRunner run(RestTemplate restTemplate) {
          return args -> {
              String quote = restTemplate.getForObject("http://gturnquist-quoters.cfapps.io/api/random", String.class);
              log.info(quote.toString());
          };
      }
  
  }
  

• application.yml 文件如下

  server: 
    port: 8092
  

• 构建一个服务发布者

  @RestController
  @RequestMapping("/user")
  public class ProducterController {
  
      @GetMapping("")
      public User getUser(){
          return new User(1);
      }
  
      @GetMapping("/list")
      public List getUserList(){
          List list = new ArrayList<>();
          for(int i = 0; i < 10; i++){
              list.add(new User(i));
          }
          return list;
      }
  }
  

• 构建一个服务消费者者

  @RestController
  public class CustomerController {
  
      @Autowired
      private RestTemplate restTemplate;
  
      @GetMapping("/getUser")
      public User getUser() throws Exception{
          String json = restTemplate.getForObject("http://localhost:8080/user", String.class);
          System.out.println(json);
          ObjectMapper mapper = new ObjectMapper();
          User user = mapper.readValue(json, User.class);
          return user;
      }
      @GetMapping("/getList")
      public List getUserList() throws Exception{
          String json = restTemplate.getForObject("http://localhost:8080/user/list", String.class);
          ObjectMapper mapper = new ObjectMapper();
          /*JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, User.class);
          List list = mapper.readValue(json, javaType);*/
          List list = mapper.readValue(json, List.class);
          return list;
      }
  }
  

• 启动程序访问 http://localhost:8092/getUser 页面显示如下:
  

  个人学习springboot博客地址:
  http://blog.csdn.net/forezp/article/details/70341818
  http://blog.didispace.com/Spring-Boot%E5%9F%BA%E7%A1%80%E6%95%99%E7%A8%8B/