使用Feign实现Form表单提交

<dependency>
  <groupId>io.github.openfeign.form</groupId>
  <artifactId>feign-form</artifactId>
  <version>3.2.2</version>
</dependency>
<dependency>
  <groupId>io.github.openfeign.form</groupId>
  <artifactId>feign-form-spring</artifactId>
  <version>3.2.2</version>
</dependency>

@FeignClient(name = "xxx", url = "http://www.itmuch.com/", configuration = TestFeignClient.FormSupportConfig.class)
public interface TestFeignClient {
    @PostMapping(value = "/test",
            consumes = {MediaType.APPLICATION_FORM_URLENCODED_VALUE},
            produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}
            )
    void post(Map<String, ?> queryParam);

    class FormSupportConfig {
        @Autowired
        private ObjectFactory<HttpMessageConverters> messageConverters;
        // new一个form编码器，实现支持form表单提交
        @Bean
        public Encoder feignFormEncoder() {
            return new SpringFormEncoder(new SpringEncoder(messageConverters));
        }
        // 开启Feign的日志
        @Bean
        public Logger.Level logger() {
            return Logger.Level.FULL;
        }
    }
}

@GetMapping("/user/{id}")
public User findById(@PathVariable Long id) {
  HashMap<String, String> param = Maps.newHashMap();
  param.put("username","zhangsan");
  param.put("password","pwd");
  this.testFeignClient.post(param);
  return new User();
}

...[TestFeignClient#post] ---> POST http://www.baidu.com/test HTTP/1.1
...[TestFeignClient#post] Accept: application/json;charset=UTF-8
...[TestFeignClient#post] Content-Type: application/x-www-form-urlencoded; charset=UTF-8
...[TestFeignClient#post] Content-Length: 30
...[TestFeignClient#post] 
...[TestFeignClient#post] password=pwd&username=zhangsan
...[TestFeignClient#post] ---> END HTTP (30-byte body)