我有一个以JSON和XML格式返回对象的服务。
I have a service which returns objects in JSON and XML format.
http:// localhost:8091 / apiN / xml / 2
XML结果
<restObjectList> <restObjectList> <restObjectList> <timestamp>2017-06-19 17:01:01</timestamp> <title>Rest object</title> <fullText>This is the full text. ID: 1</fullText> <id>1</id> <value>0.1412789210135622</value> </restObjectList> <restObjectList> <timestamp>2017-06-19 17:01:01</timestamp> <title>Rest object</title> <fullText>This is the full text. ID: 2</fullText> <id>2</id> <value>0.9886539664938628</value> </restObjectList> </restObjectList> </restObjectList>http:// localhost:8091 / apiN / 2
JSON结果
{ "restObjectList": [ { "timestamp": "2017-06-19 17:01:01", "title": "Rest object", "fullText": "This is the full text. ID: 1", "id": 1, "value": 0.1412789210135622 }, { "timestamp": "2017-06-19 17:01:01", "title": "Rest object", "fullText": "This is the full text. ID: 2", "id": 2, "value": 0.9886539664938628 } ] }结果我想收到
xml
<restObjectList> <restObject> <timestamp>2017-06-19 17:01:01</timestamp> <title>Rest object</title> <fullText>This is the full text. ID: 1</fullText> <id>1</id> <value>0.1412789210135622</value> </restObject> <restObject> <timestamp>2017-06-19 17:01:01</timestamp> <title>Rest object</title> <fullText>This is the full text. ID: 2</fullText> <id>2</id> <value>0.9886539664938628</value> </restObject> </restObjectList>json
{ "restObjectList": [{ "restObject": { "timestamp": "2017-06-19 17:01:01", "title": "Rest object", "fullText": "This is the full text. ID: 1", "id": 1, "value": 0.1412789210135622 } }, { "restObject": { "timestamp": "2017-06-19 17:01:01", "title": "Rest object", "fullText": "This is the full text. ID: 2", "id": 2, "value": 0.9886539664938628 } }] }如何包装 restObject 用于JSON和XML并修复 restObjectList 的XML数据,因为此标记在不同级别重复。
How do I wrap restObject for JSON and XML and fix XML data for restObjectList because this tag is repeated at different levels.
我的代码
RestObject
@JsonRootName(value = "restObject") @XmlRootElement(name = "restObject") public class RestObject implements Serializable { private LocalDateTime timestamp; private String title; private String fullText; private Long id; private Double value; //Getters, setters }RestObjectList
@JsonRootName(value = "restObjectList") @XmlSeeAlso({RestObject.class}) public class RestObjectList { private List<RestObject> restObjectList; //Getter and setter }JacksonConfig
@Configuration public class JacksonConfig { @Bean public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) { ObjectMapper objectMapper = builder.createXmlMapper(true).build(); objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);//Use custom date-time format. objectMapper.configure(SerializationFeature.WRAP_ROOT_VALUE, false); objectMapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, false); return objectMapper; } @Bean public ObjectMapper objectMapper() { ObjectMapper objectMapper = new ObjectMapper(); objectMapper.enable(SerializationFeature.WRAP_ROOT_VALUE); objectMapper.enable(DeserializationFeature.UNWRAP_ROOT_VALUE); return objectMapper; } }推荐答案
JSON和XML结构不相同。在XML中你需要一个 RestObject 的列表,在JSON中你需要一个列表,其元素在另一个对象中包装 RestObject 的实例。这不是一个简单的Jackson注释可以得到的东西,你需要一个仅用于JSON序列化的自定义序列化器。首先,获得所需的XML格式很简单:
The JSON and XML structures are not equivalent. In XML you want a list of RestObject and in JSON you want a list whose elements wrap instances of RestObject in another object. This isn't something you can get with a simple Jackson annotation, you would need a custom serializer only for JSON serialization. First of all, getting the desired XML format is straightforward:
class RestObject implements Serializable { private LocalDateTime timestamp; private String title; private String fullText; private Long id; private Double value; } @JsonRootName("restObjectList") class RestObjectList { @JacksonXmlProperty(localName = "restObject") @JacksonXmlElementWrapper(useWrapping = false) private List<RestObject> restObjectList; }如果你绝对想要在json中包装数组中的每个元素你会需要自定义序列化程序,例如
If you absolutely want to wrap each element in the array in json you'll need a custom serializer e.g.
class RestObjectSerializer extends JsonSerializer<RestObject> { @Override public void serialize(RestObject value, JsonGenerator gen, SerializerProvider serializers) throws IOException { gen.writeStartObject(); gen.writeObjectFieldStart("restObject"); gen.writeObjectField("timeStamp", value.getTimestamp()); gen.writeStringField("title", value.getTitle()); // other fields gen.writeEndObject(); gen.writeEndObject(); } }仅注册 ObjectMapper 序列化JSON,因此它不会干扰序列化为XML:
And register only with the ObjectMapper that serializes JSON so it doesn't interfere with serialization to XML:
ObjectMapper mapper = new ObjectMapper(); SimpleModule module = new SimpleModule("MyModule"); module.addSerializer(RestObject.class, new RestObjectSerializer()); mapper.registerModule(module);更多推荐
杰克逊xml和json根元素
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