MappingJackson2XmlHttpMessageConverter - Spring

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Introduction

Spring's `MappingJackson2XmlHttpMessageConverter` is a component that allows you to convert between XML and Java objects using Jackson's ObjectMapper. It's useful when you need to serialize or deserialize XML data in your Spring application. Below are some examples of how to use `MappingJackson2XmlHttpMessageConverter` in different scenarios:

1. Spring MVC Controller with XML Request and Response:

   Suppose you have a Spring MVC controller that accepts XML data in the request and returns XML data in the response.

   import org.springframework.http.MediaType;

   import org.springframework.web.bind.annotation.*;

   import org.springframework.http.ResponseEntity;

   import org.springframework.http.converter.HttpMessageConverter;

   import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;

   

   @RestController

   @RequestMapping("/api")

   public class MyController {

   

       @GetMapping(value = "/xmlResponse", produces = MediaType.APPLICATION_XML_VALUE)

       public ResponseEntity<MyObject> getXmlResponse() {

           MyObject myObject = new MyObject();

           // Populate myObject with data

           return ResponseEntity.ok(myObject);

       }

   

       @PostMapping(value = "/xmlRequest", consumes = MediaType.APPLICATION_XML_VALUE)

       public ResponseEntity<String> handleXmlRequest(@RequestBody MyObject myObject) {

           // Handle the XML request and return a response

           return ResponseEntity.ok("Received XML data: " + myObject.toString());

       }

   

       @InitBinder

       public void initBinder(WebDataBinder binder) {

           // Configure the message converter for XML

           HttpMessageConverter<Object> xmlConverter = new MappingJackson2XmlHttpMessageConverter();

           binder.registerCustomEditor(Object.class, new ByteArrayHttpMessageConverter());

           binder.registerCustomEditor(Object.class, xmlConverter);

       }

   }

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2. Customize Jackson ObjectMapper:

   You can customize the Jackson ObjectMapper used by `MappingJackson2XmlHttpMessageConverter` to control serialization and deserialization settings.

   import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;

   import com.fasterxml.jackson.databind.ObjectMapper;

   import com.fasterxml.jackson.dataformat.xml.XmlMapper;

   

   @Configuration

   public class JacksonConfig {

   

       @Bean

       public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter() {

           MappingJackson2XmlHttpMessageConverter converter = new MappingJackson2XmlHttpMessageConverter();

           ObjectMapper objectMapper = new XmlMapper(); // Use XmlMapper for XML serialization

           // Customize the ObjectMapper as needed (e.g., configure date formats)

           objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd"));

           converter.setObjectMapper(objectMapper);

           return converter;

       }

   }

3. RestTemplate Usage:

   If you're making HTTP requests with RestTemplate and want to send or receive XML data, you can configure it to use `MappingJackson2XmlHttpMessageConverter`.

   import org.springframework.http.MediaType;

   import org.springframework.http.ResponseEntity;

   import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;

   import org.springframework.web.client.RestTemplate;

   

   public class MyApiClient {

   

       public ResponseEntity<MyObject> fetchData() {

           RestTemplate restTemplate = new RestTemplate();

           MappingJackson2XmlHttpMessageConverter converter = new MappingJackson2XmlHttpMessageConverter();

           restTemplate.getMessageConverters().add(converter);

   

           ResponseEntity<MyObject> response = restTemplate.getForEntity(

               "http://example.com/api/xmlResponse",

               MyObject.class

           );

   

           return response;

       }

   }

These examples demonstrate how to use `MappingJackson2XmlHttpMessageConverter` in various scenarios within a Spring application for XML serialization and deserialization. Make sure to include the necessary dependencies in your project, such as Jackson libraries, to use this converter effectively.

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