restcontroller和Application/x-www-form-urlencoded；charset=UTF-8媒体类型的问题

Question

任务很简单，客户机使用application/x-www-form-urlencoded媒体类型的POST发送请求。服务器接收并响应状态为OK。但是看起来媒体类型application/x-www-form-urlencoded和application/x-www-form-urlencoded之间有区别；charset=UTF-8

服务器部分：

@Slf4j
@Controller
@RequestMapping(produces = MediaType.APPLICATION_FORM_URLENCODED_VALUE, consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
public class CallbackController {

@RequestMapping(value = "/callback/", method = RequestMethod.POST, consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    public ResponseEntity<?> callback(HttpServletRequest servletRequest, @RequestBody RequestEntity<?> body) throws IOException {
        log.info("Hello: {}", servletRequest);
        log.info("Hello: {}", body);
        String s = extractPostRequestBody(servletRequest);
        log.info("Hello: {}", s);
        return new ResponseEntity<Object>(HttpStatus.OK);
    }
}

客户部分：

public void sendcallback() throws IOException {
        RestTemplate restTemplate = new RestTemplate();
        String url = "http://localhost:8082/callback/";
        MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
        headers.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_FORM_URLENCODED_VALUE);
        headers.add(HttpHeaders.ACCEPT_CHARSET, "UTF-8");
        headers.add(HttpHeaders.ACCEPT, MediaType.APPLICATION_FORM_URLENCODED_VALUE);
        headers.add(HttpHeaders.USER_AGENT, "uuuuuuuuuuser");
        headers.add(HttpHeaders.AUTHORIZATION, "none");
MultiValueMap<String, String> body = new LinkedMultiValueMap<String, String>();
        List<String> val1 = new ArrayList<>();
        val1.add("valllll");
        body.put("val", val1);
        HttpEntity<?> entity= new HttpEntity<>(body, headers);
        ResponseEntity<?> result = restTemplate.exchange(url, HttpMethod.POST, entity, Object.class);
        log.info("response: {}", result);
    }

客户端的结果输出请求：

"POST /callback/ HTTP/1.1[\r][\n]"
"Content-Type: application/x-www-form-urlencoded[\r][\n]"
"Accept-Charset: UTF-8[\r][\n]"
"Accept: application/x-www-form-urlencoded[\r][\n]"
"User-Agent: uuuuuuuuuuser[\r][\n]"
"Authorization: none[\r][\n]"
"Content-Length: 11[\r][\n]"
"Host: localhost:8082[\r][\n]"
"Connection: Keep-Alive[\r][\n]"
"Accept-Encoding: gzip,deflate[\r][\n]"
"[\r][\n]"
"val=valllll"

回应：

"HTTP/1.1 405 Method Not Allowed[\r][\n]"
"Server: Apache-Coyote/1.1[\r][\n]"
"Allow: GET, HEAD[\r][\n]"
"Content-Language: ru-RU[\r][\n]"
"Content-Length: 0[\r][\n]"
"Date: Tue, 11 Aug 2015 06:28:41 GMT[\r][\n]
"[\r][\n]"

和调试模式下的服务器告诉我一件有趣的事情：

Answer 1

看来我必须手动添加FormHttpMessageConverter

@SpringBootApplication
public class CallbackApplication extends WebMvcConfigurerAdapter {

    public static void main(String[] args) {
        SpringApplication.run(CallbackApplication.class);
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FormHttpMessageConverter converter = new FormHttpMessageConverter();
        MediaType mediaType = new MediaType("application","x-www-form-urlencoded", Charset.forName("UTF-8"));
        converter.setSupportedMediaTypes(Arrays.asList(mediaType));
        converters.add(converter);
        super.configureMessageConverters(converters);
    }
}

不要忘记使用正确的@RequestBody类型

public@responsebody responseentity<？>回调（HttpServletRequest servletRequest,@requestbody MultiValueMap body）{

因为有：

• org.springframework.util.multivalueMap
• org.apache.commons.collections.map.multivalueMap