Spring中的内容类型问题 [英] Issue with content type in Spring

问题描述

我收到的POST有问题.我有以下端点:

I have an issue with a POST that I am receiving. I have the following endpoint:

@RequestMapping(value = "/payment", method = POST)
public void saveOrder(@RequestBody PaymentDto paymentDto) throws RequiredFieldException, IOException, MessagingException {
//do something
}

现在，当有人通过该URL向我发送POST时，我得到以下响应:

Now, when someone send me POST on this URL, I get the following in response:

{"errorMessage":"Unsupported Media Type",
"errorId":"906f5dc8-0b79-4f91-9eaa-a252e8d5ac76",
"errorDetails":
    {"message":"Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported",
    "exception":"org.springframework.web.HttpMediaTypeNotSupportedException",
    "errors":null
}}

我该如何解决?发送时无法更改内容类型标头.它是由我无法控制的服务器发送的.

How can I fix that? I cannot change content type header when I send it. It is send from server that I don't control.

推荐答案

到目前为止，对我来说最好的替代方法是编写一个转换器.

So far the best alternativity for me was write a converter.

我选择这种方式的要点是:

My points to choose this way are:

• 我只需要处理我的API中的一个端点(和一个对象)，这与我可以控制它们的其他端点不同；
• 我无法控制调用我的端点的第三方服务；
• 第三方服务仅以一种方式通过媒体类型为application/x-www-form-urlencoded的POST调用我的服务.

• I need to deal with only one endpoint (and only one object) in my API which are different for others endpoints that I have control over them;
• I have not control about the thirdy party service that call my endpoint;
• The thirdy party service call in only one way my services, via POST with media type as application/x-www-form-urlencoded.

第一:编写一个对象

package xx.xx.xx;

import java.io.Serializable;

public class MyObject implements Serializable {

    private static final long serialVersionUID = -7474838713815803531L;

    private String name;

    private String id;

    ...

    getters

    setters

    ...

}

第二:创建一个转换器以映射模型

Second: create a converter to mapping the model

package xx.xx.xx;

import java.io.IOException;
import java.util.Map;

import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;

import com.fasterxml.jackson.databind.ObjectMapper;

import xx.xx.xx.MyObject;

public class MyObjectConverter extends AbstractHttpMessageConverter<MyObject> {

    private static final FormHttpMessageConverter formHttpMessageConverter = new FormHttpMessageConverter();
    private static final ObjectMapper mapper = new ObjectMapper();

    @Override
    protected boolean supports(Class<?> clazz) {
        return (MyObject.class == clazz);
    }

    @Override
    protected MyObject readInternal(Class<? extends MyObject> clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
        Map<String, String> vals = formHttpMessageConverter.read(null, inputMessage).toSingleValueMap();
        return mapper.convertValue(vals, MyObject.class);
    }

    @Override
    protected void writeInternal(MyObject myObject, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {

    }
}

第三:告诉Spring使用此转换器

Third: tell to spring use this converter

package xx.xx.xx;

import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.List;

import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class HppResponseConverterDTOConfig implements WebMvcConfigurer {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(converter());
    }

    private MyObjectConverter converter() {
        MyObjectConverter converter = new MyObjectConverter();
        MediaType mediaType = new MediaType("application", "x-www-form-urlencoded", Charset.forName("UTF-8"));
        converter.setSupportedMediaTypes(Arrays.asList(mediaType));
        return converter;
    }
}

奖金:此配置/实现处理属性内的下划线字符，换句话说:您可以使用@JsonProperty批注，因为上面的此实现使用ObjectMapper并且对象Mapper(我认为)与spring用于序列化的相同普通的POST与Content-type: application/json.

Bonus: this configuration/implementation deal with underscore character inside attributes, in other words: you can use @JsonProperty annotation because this implementation above use ObjectMapper and object Mapper (I think) is the same that spring use to serialize normal POST's with Content-type: application/json.

第四，最后:使用此实现:

Fourth and final: using this implementation:

package xx.xx.xx;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/my-object-controller")
public class MyObjectController {

    @PostMapping(value = "/something", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    public void doSomething(@RequestBody MyObject myObject) {
        doSomethingWithMyObject(myObject);
    }

}

我希望它会有所帮助:)

I hope it helps :)

编辑:我正在使用Spring Boot 2

EDIT: I'm using spring boot 2

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