在POST方法中向Spring（Jackson）REST控制器发送字符串

Question

我正在尝试使用HTTP Post方法向rest服务发送string对象。并且字符串应该在请求正文中发送。

@RestController
@RequestMapping(value = "post", method = RequestMethod.POST)
public class HttpMethodPostController {

    /*HttpClientErrorException: 415 null*/
    @RequestMapping(value = "/string_as_text", consumes = MediaType.TEXT_PLAIN_VALUE)
    public ResponseEntity<Void> getStringAsText(@RequestBody String text) {
        System.out.println("[Server] text = " + text);
        return new ResponseEntity<Void>(HttpStatus.OK);
    }

    /*HttpClientErrorException: 400 null*/
    @RequestMapping(value = "/string_as_json", consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public ResponseEntity<Void> getStringAsJSON(@RequestBody String text) {
        System.out.println("[Server] text = " + text);
        return new ResponseEntity<Void>(HttpStatus.OK);
    }

    @RequestMapping(value = "/type1_", consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public ResponseEntity<Void> postType1_(@RequestBody Type1_ type1_) {
        System.out.println("[Server] type1_ = " + type1_);
        return new ResponseEntity<Void>(HttpStatus.OK);
    }

}

public class HttpMethodPostConsumer {
    public static final String POST_ADDRESS = "http://localhost:55055/post";

    /*HttpClientErrorException: 415 null*/
    public static void postStringAsText(String text) {
        final RestTemplate restTemplate = new RestTemplate();
        final HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.TEXT_PLAIN);
        final HttpEntity<String> entity = new HttpEntity<>(text, headers);
        final URI uri = restTemplate.postForLocation(POST_ADDRESS + "/string_as_text", entity, String.class);
        System.out.println("uri = " + uri);
    }

    /*HttpClientErrorException: 400 null*/
    public static void postStringAsJSON(String text) {
        final RestTemplate restTemplate = new RestTemplate();
        final HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        final HttpEntity<String> entity = new HttpEntity<>(text, headers);
        final URI uri = restTemplate.postForLocation(POST_ADDRESS + "/string_as_json", entity, String.class);
        System.out.println("uri = " + uri);
    }

    public static void postType1_(Type1_ type1_) {
        final RestTemplate restTemplate = new RestTemplate();
        final HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        final HttpEntity<Type1_> httpEntity = new HttpEntity<Type1_>(type1_, headers);
        final URI result_URI = restTemplate.postForLocation(POST_ADDRESS + "/type1_", httpEntity, Type1_.class);
        System.out.println("result_URI = " + result_URI);
    }
}

public class HttpMethodPostConsumerTest {

    /*HttpClientErrorException: 415 null*/
    @Test
    public void test_postStringAsText() {
        final String text = Randomizers.getString();
        System.out.println("text = " + text);
        postStringAsText(text);
    }

    /*HttpClientErrorException: 400 null*/
    @Test
    public void test_postStringAsJSON() {
        final String text = Randomizers.getString();
        System.out.println("text = " + text);
        postStringAsJSON(text);
    }

    @Test
    public void test_postType1_() {
        final Type1_ type1_ = ModelFactory.getType1_();
        System.out.println("[Consumer] type1_ = " + type1_);
        postType1_(type1_);
    }

}

null

在org.springframework.web.client.defaultresponseerrorhandler.handleerror(defaultresponseerrorhandler.java:94)在org.springframework.web.client.defaultresponseerrorhandleerror(defaultresponseerrorhandler.java:79)在org.springframework.web.client.responseerrorhandleerror(responseerrorhandler.java:63)在org.springframework.web.client.resttemplate.handleresponse（resttemplate.java:775)在.springframework.web.client.resttemplate.execute(resttemplate.java:684)在org.springframework.web.client.resttemplate.postforlocation(resttemplate.java:405)在personal.learn.java.spring_rest.rest_general.non_automate.consumers.httpmethodpostconsumer.poststringastext(httpmethodpostconsumer.java:21)在

• 运行test_poststringasjson()将导致错误
  • 客户端/使用者端错误

  org.springframework.web.client.HttpClientRorexception：400 null

  在org.springframework.web.client.defaultresponseerrorhandler.handleerror(defaultresponseerrorhandler.java:94)在org.springframework.web.client.defaultresponseerrorhandleerror(defaultresponseerrorhandler.java:79)在org.springframework.web.client.responseerrorhandleerror(responseerrorhandler.java:63)在org.springframework.web.client.resttemplate.handleresponse（resttemplate.java:775)在.springframework.web.client.resttemplate.execute(resttemplate.java:684)在org.springframework.web.client.resttemplate.postforlocation(resttemplate.java:405)在personal.learn.java.spring_rest.rest_general.non_automated.consumers.httpmethodpostconsumer.poststringasjson（httpmethodpostconsumer.java:31)在personal.learn.java.spring_rest.rest_general.non_automated.consumers.httpmethodpostconsumertest.test_poststringasjson（

  服务器端错误（控制台中）

  02-may-2018 17:25:45.469警告[http-nio-55055-exec-2]org.springframework.web.servlet.mvc.support.defaultHandlerExceptionResolver.HandleHttpMessageNotReadable无法读取HTTP消息：org.springframework.HTTP.converter.httpMessageNotReadable异常：JSON分析错误：无法识别的令牌“IATQDixtch”：应为“null”、“true”、“false”或NaN；嵌套异常为com.fasterxml.jackson.core.JSONParseException：无法识别的标记“IATQDixtch”：在[Source:(PushbackInputStream)；行：1,列：21]处应为“null”、“true”、“false”或NaN

  服务器端错误（在Tomcat Catalina日志中）

Answer 1

如果您想要使用@RequestBody发布到您的服务器，那么需要将一个对象发送到您的控制器。

使用字符串参数创建DTO类：

public class ExampleDTO {

 private String stringExample;

  public String getStringExample() {
    return stringExample;
  }

  public void setStringExample(String stringExample) {
    this.stringExample= stringExample;
  }

}

您的控制器：

@RequestMapping(method = RequestMethod.POST, value = "/string_as_text")
public ResponseEntity<Void> getStringAsText(@RequestBody ExampleDTO exampleDTO) {
    System.out.println("[Server] text = " + exampleDTO.getStringExample());
    return new ResponseEntity<Void>(HttpStatus.OK);
}

消费者

ExampleDTO param = new ExampleDTO();
param.setStringExample("text")