问题描述
我将数据库中的对象存储为JSON字符串。我想制作一个暴露这些字符串的REST服务。然而,当我编写我的方法时,我回来的字符串会引用它们的引号。例如,我已经包含了一个返回String的方法,
I am storing objects in my database as JSON strings. I want to make a REST service that exposes these strings. When I write my methods however, the strings I get back have their quotes escaped. For example, I have included a method that returns a String,
@RequestMapping(value = "test", method = RequestMethod.GET)
public @ResponseBody
String getTest() {
return "{\"a\":1, \"b\":\"foo\"}";
}
但是当我在浏览器中调用此方法时,我得到了回复{\\ \\a \:1,\b \:\foo \}当我真正想要发生的是{a:1,b:foo}。我认为String作为返回类型可能是问题所在,但我还能做些什么呢?包装类执行相同的操作:
but when I call this method in the browser I get a back "{\"a\":1, \"b\":\"foo\"}" when what I really want to happen is {"a": 1, "b": "foo"}. I think "String" as the return type is likely the problem, but what else can I do? A wrapper class does the same thing:
{
"value" : "{\"a\":1, \"b\":\"foo\"}"
}
我可以序列化然后返回对象,但这看起来有点荒谬。
这可能是我的配置文件的相关部分:
I could serialize it and then return the object, but that seems a bit ridiculous.Here is a possibly the relevant portion of my configuration file:
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
super.configureMessageConverters(converters);
converters.add(mappingJacksonHttpMessageConverter());
}
@Bean
MappingJacksonHttpMessageConverter mappingJacksonHttpMessageConverter() {
MappingJacksonHttpMessageConverter mappingJacksonHttpMessageConverter = new MappingJacksonHttpMessageConverter();
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
mappingJacksonHttpMessageConverter.setObjectMapper(objectMapper);
mappingJacksonHttpMessageConverter.setPrettyPrint(true);
return mappingJacksonHttpMessageConverter;
}
谢谢
编辑:如下所示,似乎字符串是双重编码。在我的配置中注释掉这两个类可以解决这个问题。但是,我仍然有其他地方我想要返回对象,并希望保持那些运行通过我知道在哪里配置的常见序列化bean。所以我看到我的选项为:
a)自己做所有的序列化。所有方法都返回字符串,那些已经是JSON的方法返回自己,而那些作为对象的方法都返回JSONUtil.toJson(object)。我不喜欢这种方法,但我知道它会起作用。
b)使用类似于以下内容的包装类:
as was suggested below, it seems the string is being double encoded. Commenting out the 2 classes in my configuration fixes this issue. However, I still have other places where I want to return Objects and would like to keep those running through that common serializing bean that I know where to configure. So I see my options as:a) Do all the serializing myself. All methods return Strings, and those that are already JSON return themselves, and those that are objects all return JSONUtil.toJson(object). I don't love this approach, but I know it will work.b) Use a wrapper class that looks kind of like:
public static class Wrapper {
@JsonRawValue
private final String value;
}
这导致前面一个尴尬的价值虽然没有真正的意思是。
This leads to an awkward "value" at the front though that has no real meaning.
基本上我想要的是@JsonRawValue,但要让它适用于RequestMapping方法而不是属性。
想法?意见?其他建议?
Basically what I want is @JsonRawValue, but to have it work on RequestMapping methods instead of properties.Thoughts? Opinions? Other suggestions?
推荐答案
这适用于Jackson 2(至少):
This works with Jackson 2 (at least):
@Controller
public class YourController {
@RequestMapping(..)
public @ResponseBody Json get() {
return new Json("{ \"attr\" : \"value\" }");
}
}
class Json {
private final String value;
public Json(String value) {
this.value = value;
}
@JsonValue
@JsonRawValue
public String value() {
return value;
}
}
不是特别漂亮但有效。我只希望Spring支持这个:
Not particularly pretty but works. I only wish Spring supported this:
@RequestMapping(..)
public @JsonRawValue @ResponseBody String get() {
// ...
}
HTH,
Jukka
HTH,Jukka
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