使@ResponseBody注释的Spring(Boot)MVC控制器方法返回UTF-8 [英] Make @ResponseBody-annotated Spring (Boot) MVC controller methods return UTF-8

问题描述

我正在使用Spring Boot构建Spring MVC服务，并希望能够以UTF-8编码的纯文本形式返回字符串.遵循此描述，我认为唯一必要的事情应该是添加bean方法

I'm building a Spring MVC service using Spring Boot and want to be able to return strings as plain text encoded in UTF-8. Following this description, I thought the only thing necessary should be to add the bean method

@Bean
public HttpMessageConverter<String> responseBodyConverter() {
    StringHttpMessageConverter converter = new StringHttpMessageConverter();
    converter.setSupportedMediaTypes(Arrays.asList(new MediaType("text", "plain", Charset.forName("UTF-8"))));
    return converter;
}

但

中的root方法

@Controller
public class RootController {

    @RequestMapping(value="/"/*, produces="text/plain;charset=UTF-8"*/)
    @ResponseBody
    public String root() {
        return "æøå";
    }

}

响应ISO-8859-1中的字符串æøå而不是UTF-8，除非我取消注释produces部分，在这种情况下，它实际上返回UTF-8.消息转换器在这里似乎没有任何作用.

responds the string æøå in ISO-8859-1 instead of UTF-8, unless I uncomment the produces part, in which case it actually returns UTF-8. The message converter doesn't seems to have any effect here.

按照此方法，我确认该bean实际上已经被注册.除了这个bean，我还注册了EmbeddedServletContainerFactory和CharacterEncodingFilter，如

Following this approach I confirm that the bean has actually been registered. Besides this bean, I also register an EmbeddedServletContainerFactory and CharacterEncodingFilter as described in another question, although I don't think that's relevant here.

有人可以解释注册的HttpMessageConverter的实际作用，以及如何使带有@ResponseBody注释的控制器方法返回UTF-8，而不必每次都提供produces吗?

Can someone explain what the registered HttpMessageConverter actually does, and how to make @ResponseBody-annotated controller methods return UTF-8 without having to provide produces every time?

修改

正如评论中所讨论的那样，为了使工作正常，我不得不将Spring Boot的版本从0.5.0.M6升级到0.5.0.BUILD-SNAPSHOT，并且为了防止输出垃圾头，请在converter.setWriteAcceptCharset(false) >.

As discussed in the comments, for the accepted answer to work, I had to upgrade the version of Spring Boot from 0.5.0.M6 to 0.5.0.BUILD-SNAPSHOT and, to prevent outputting a junk header, call converter.setWriteAcceptCharset(false) on the StringHttpMessageConverter.

推荐答案

StringHttpMessageConverter的默认字符集是ISO-8859-1.这意味着当客户端不请求特定的字符集时，将返回ISO-8859-1.

The default character set for the StringHttpMessageConverteris ISO-8859-1. That means when a client does not request a specific character set, then ISO-8859-1 will be returned.

如果希望UTF-8作为默认字符集，则将其传递给构造函数:

If you want UTF-8to be the default character set then you pass it into the constructor:

converter = new StringHttpMessageConverter(Charset.forName("UTF-8"));

由于自动添加了text/plain; charset=default character set，因此不再需要调用setSupportedMediaTypes().

Calling setSupportedMediaTypes() is then no longer necessary either as text/plain; charset=default character set is added automatically.

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