Spring Cloud Feign Form表单 Spring Cloud使用Feign实现Form表单提交的示例

时间:2021-03-28 周立人气:0

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之前，笔者写了《使用Spring Cloud Feign上传文件》。近日，有同事在对接遗留的Struts古董系统，需要使用Feign实现Form表单提交。其实步骤大同小异，本文附上步骤，算是对之前那篇的补充。

添加依赖：

<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>

Feign Client示例：

@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;
    }
  }
}

调用示例：

@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();
}

日志：

...[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)

由日志可知，此时Feign已能使用Form表单方式提交数据。

参考文档
https://github.com/OpenFeign/feign-form
https://stackoverflow.com/questions/35803093/how-to-post-form-url-encoded-data-with-spring-cloud-feign

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