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使用Feign实现Form表单提交

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:

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    <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:

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    @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:

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    @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:

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    ...[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

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