By using @RequestBody annotation you will get your values mapped with the model you created in your system for handling any specific call. While by using @ResponseBody you can send anything back to the place from where the request was generated. Both things will be mapped easily without writing any custom parser etc.
The @ResponseBody annotation tells a controller that the object returned is automatically serialized into JSON and passed back into the HttpResponse object. When you use the @ResponseBody annotation on a method, Spring converts the return value and writes it to the HTTP response automatically.
ResponseEntity<> is a generic class with a type parameter, you can specify what type of object to be serialized into the response body. @ResponseBody is an annotation, indicates that the return value of a method will be serialized into the body of the HTTP response.
I found solution for Spring 3.1. with using @ResponseBody annotation. Here is example of controller using Json output:
@RequestMapping(value = "/getDealers", method = RequestMethod.GET,
produces = "application/json; charset=utf-8")
@ResponseBody
public String sendMobileData() {
}
Simple declaration of the StringHttpMessageConverter
bean is not enough, you need to inject it into AnnotationMethodHandlerAdapter
:
<bean class = "org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<array>
<bean class = "org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes" value = "text/plain;charset=UTF-8" />
</bean>
</array>
</property>
</bean>
However, using this method you have to redefine all HttpMessageConverter
s, and also it doesn't work with <mvc:annotation-driven />
.
So, perhaps the most convenient but ugly method is to intercept instantiation of the AnnotationMethodHandlerAdapter
with BeanPostProcessor
:
public class EncodingPostProcessor implements BeanPostProcessor {
public Object postProcessBeforeInitialization(Object bean, String name)
throws BeansException {
if (bean instanceof AnnotationMethodHandlerAdapter) {
HttpMessageConverter<?>[] convs = ((AnnotationMethodHandlerAdapter) bean).getMessageConverters();
for (HttpMessageConverter<?> conv: convs) {
if (conv instanceof StringHttpMessageConverter) {
((StringHttpMessageConverter) conv).setSupportedMediaTypes(
Arrays.asList(new MediaType("text", "html",
Charset.forName("UTF-8"))));
}
}
}
return bean;
}
public Object postProcessAfterInitialization(Object bean, String name)
throws BeansException {
return bean;
}
}
-
<bean class = "EncodingPostProcessor " />
Note that in Spring MVC 3.1 you can use the MVC namespace to configure message converters:
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes" value = "text/plain;charset=UTF-8" />
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
Or code-based configuration:
@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
private static final Charset UTF8 = Charset.forName("UTF-8");
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
StringHttpMessageConverter stringConverter = new StringHttpMessageConverter();
stringConverter.setSupportedMediaTypes(Arrays.asList(new MediaType("text", "plain", UTF8)));
converters.add(stringConverter);
// Add other converters ...
}
}
Just in case you can also set encoding by the following way:
@RequestMapping(value = "ajax/gethelp")
public ResponseEntity<String> handleGetHelp(Locale loc, String code, HttpServletResponse response) {
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.add("Content-Type", "text/html; charset=utf-8");
log.debug("Getting help for code: " + code);
String help = messageSource.getMessage(code, null, loc);
log.debug("Help is: " + help);
return new ResponseEntity<String>("returning: " + help, responseHeaders, HttpStatus.CREATED);
}
I think using StringHttpMessageConverter is better than this.
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