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Http Post with request content type form not working in Spring MVC 3

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旧时难觅i
旧时难觅i 2020-12-02 11:13

code snippet: 

@RequestMapping(method = RequestMethod.POST)//,  headers = \"content-type=application/x-www-form-urlencoded\")
public ModelAndView create(@Req
7条回答
  • 不思量自难忘°
    不思量自难忘° (楼主)
    2020-12-02 11:54

    At the heart of the problem, we wish to accept both application/json and application/x-www-form-urlencoded Content-types with the same request handler.

    To do this, I use the @RequestBody, which was already working for application/json for me (and generally others from the threads I've found, but there is extra work so application/x-www-form-urlencoded can be used with @RequestBody.

    First, create a new HttpMessageConverter capable of changing the request input to an object. I do this by reusing the FormHttpMessageConverter, which is already capable of changing the input to a MultiValueMap. I then change the MultiValueMap to a regular Map, and use Jackson to turn the Map to the desired object.

    Here is the code for the HttpMessageConverter:

    import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

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

/**
 * 
    Converts HTTP requests with bodies that are application/x-www-form-urlencoded or multipart/form-data to an Object
 * annotated with {@link org.springframework.web.bind.annotation.RequestBody} in the the handler method.
 *
 * @author Jesse Swidler
 */
public class ObjectHttpMessageConverter implements HttpMessageConverter {

    private final FormHttpMessageConverter formHttpMessageConverter = new FormHttpMessageConverter();
    private final ObjectMapper objectMapper = new ObjectMapper();

    private static final LinkedMultiValueMap LINKED_MULTI_VALUE_MAP = new LinkedMultiValueMap<>();
    private static final Class> LINKED_MULTI_VALUE_MAP_CLASS
            = (Class>) LINKED_MULTI_VALUE_MAP.getClass();

    @Override
    public boolean canRead(Class clazz, MediaType mediaType) {
        return objectMapper.canSerialize(clazz) && formHttpMessageConverter.canRead(MultiValueMap.class, mediaType);
    }

    @Override
    public boolean canWrite(Class clazz, MediaType mediaType) {
        return false;
    }

    @Override
    public List getSupportedMediaTypes() {
        return formHttpMessageConverter.getSupportedMediaTypes();
    }

    @Override
    public Object read(Class clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
        Map input = formHttpMessageConverter.read(LINKED_MULTI_VALUE_MAP_CLASS, inputMessage).toSingleValueMap();
        return objectMapper.convertValue(input, clazz);
    }

    @Override
    public void write(Object o, MediaType contentType, HttpOutputMessage outputMessage) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("");
    }
}



    There are many different ways a Spring app might pick up that message converter. For me, it was accomplished in an XML file:
    


    
    
        
    


    
    
    
             
    
                                                        
    
            
            
    
              
                
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