[英]JAXB / Jersey - JSONObject as XmlElement
我正在使用Jersey(1.9.1),並將JAXB用於我的對象,並嘗試添加一個只是JSON對象的字段,理想情況下,該字段的類型為Jackson的JsonNode,但我也可以使用jettison的JSONObject(甚至GSON的JsonObject) / JsonElement)
這樣做的原因是因為除了同一個對象上的其他元素(使用JAXB注釋)之外,我還希望發送“自由格式”的json(作為示例中的obj元素)。
我的對象:
import org.codehaus.jettison.json.JSONObject;
@XmlRootElement(name="moo")
@XmlAccessorType(XmlAccessType.FIELD)
public class Moo {
@XmlElement
JSONObject obj;
...
}
我的資源:
@Path("/moo")
@POST
@Produces({MediaType.APPLICATION_JSON})
@Consumes({MediaType.APPLICATION_JSON})
public Response postMsg(Moo e) {
System.out.println(e);
return Response.status(200).entity(e).build();
}
有效負載:
{"obj": {"my": "custom", "object": 1, "here": [1, 2, 3] } }
當執行上述POST請求時, obj
是一個空的JSONObject
。 當我嘗試使用Jackson的JsonNode
和GSON的JsonElement
/ JsonObject
時,發生了同樣的事情。
但是,當我使用JSONObject
作為方法的arg時,它能夠解析它
@Path("/moo")
@POST
@Produces({MediaType.APPLICATION_JSON})
@Consumes({MediaType.APPLICATION_JSON})
public Response postMsg(JSONObject e) {
System.out.println(e);
return Response.status(200).entity(e).build();
}
我認為發生這種情況是因為Jersey使用其自己的com.sun.jersey.json.impl.provider.entity.JSONObjectProvider
進行編組,而JAXB使用其自己的編組器。
在仍然使用JAXB的注釋(針對其他字段)時,是否有解決方法? 我嘗試使用自定義XmlAdapter
(使用@XmlJavaTypeAdapter
批注),但沒有成功(因為作為ValueType
獲得的對象是DOM元素)
我的最終目標是將字段obj
作為Jackson表示形式( JsonNode
)。
任何方向將不勝感激。
如果我做對了,您想嵌入一個原始json以獲取自由值。
@XmlRootElement(name="moo")
@XmlAccessorType(XmlAccessType.FIELD)
public class Moo {
Object json;
@JsonRawValue
public String getJson() {
// default raw value: null or "[]"
return json == null ? null : json.toString();
}
public void setJson(JsonNode node) {
this.json = node;
}
}
取自這里 。
首先有很多問題
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.sun.xml.bind.marshaller.CharacterEscapeHandler;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.*;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import javax.xml.validation.Schema;
import javax.xml.validation.TypeInfoProvider;
import javax.xml.validation.Validator;
import javax.xml.validation.ValidatorHandler;
import java.io.File;
import java.io.IOException;
import java.io.Writer;
public class TestObjectNode {
@XmlRootElement(name = "moo")
@XmlAccessorType(XmlAccessType.FIELD)
static class Moo {
@JsonProperty("obj")
@XmlElement
@XmlJavaTypeAdapter(ObjMarshaller.class)
JsonNode obj;
}
static final ObjectMapper JSON_MAPPER = new ObjectMapper();
static final XmlMapper XML_MAPPER = (XmlMapper) new XmlMapper()
.disable(SerializationFeature.WRAP_ROOT_VALUE)
.disable(DeserializationFeature.UNWRAP_ROOT_VALUE);
public static void main(String[] args) throws Exception {
final String value = "{\"obj\": {\"my\": \"custom\", \"object\": 1, \"here\": [1, 2, 3] } }";
Moo moo = JSON_MAPPER.readValue(value, Moo.class);
System.out.println(moo.obj);
saveToFile(moo);
System.out.println(XML_MAPPER.writeValueAsString(moo));
moo = readFromFile();
System.out.println(moo.obj);
}
private static void saveToFile(Moo moo) throws Exception {
File file = new File("moo.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Moo.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.setProperty(CharacterEscapeHandler.class.getName(),
new CharacterEscapeHandler() {
@Override
public void escape(char[] chars, int i, int i1, boolean b, Writer writer) throws IOException {
writer.write(chars, i, i1);
}
});
jaxbMarshaller.marshal(moo, file);
jaxbMarshaller.marshal(moo, System.out);
}
private static Moo readFromFile() throws Exception {
File file = new File("moo.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Moo.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
MySchema mySchema = new MySchema();
unmarshaller.setSchema(mySchema);
Moo moo = (Moo) unmarshaller.unmarshal(file);
String objectNode = mySchema.validatorHandler.getObjectNodeString();
System.out.println("objectNode = " + objectNode);
JsonNode jsonNode = XML_MAPPER.readValue(objectNode, ObjectNode.class);
moo.obj = jsonNode;
return moo;
}
private static class ObjMarshaller extends XmlAdapter<String, JsonNode> {
@Override
public JsonNode unmarshal(String v) throws Exception {
throw new IllegalArgumentException("i'm never here///");
}
@Override
public String marshal(JsonNode v) throws Exception {
return XML_MAPPER.writeValueAsString(v);
}
}
static class MySchema extends Schema {
final ValidatorHandlerImpl validatorHandler = new ValidatorHandlerImpl();
@Override
public Validator newValidator() {
return null;
}
@Override
public ValidatorHandler newValidatorHandler() {
return validatorHandler;
}
}
static class ValidatorHandlerImpl extends ValidatorHandler {
private final StringBuilder objectNode = new StringBuilder();
private boolean insideObjectNode = false;
public String getObjectNodeString() {
return objectNode.toString();
}
@Override
public void setContentHandler(ContentHandler receiver) {
}
@Override
public ContentHandler getContentHandler() {
return null;
}
@Override
public void setErrorHandler(ErrorHandler errorHandler) {
}
@Override
public ErrorHandler getErrorHandler() {
return null;
}
@Override
public void setResourceResolver(LSResourceResolver resourceResolver) {
}
@Override
public LSResourceResolver getResourceResolver() {
return null;
}
@Override
public TypeInfoProvider getTypeInfoProvider() {
return null;
}
@Override
public void setDocumentLocator(Locator locator) {
}
@Override
public void startDocument() throws SAXException {
}
@Override
public void endDocument() throws SAXException {
}
@Override
public void startPrefixMapping(String prefix, String uri) throws SAXException {
}
@Override
public void endPrefixMapping(String prefix) throws SAXException {
}
@Override
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
if(localName.equals("ObjectNode")) {
insideObjectNode = true;
}
if (insideObjectNode) {
objectNode.append("<" + localName + ">");
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if (insideObjectNode) {
objectNode.append("</" + localName + ">");
}
if(localName.equals("ObjectNode")) {
insideObjectNode = false;
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if (insideObjectNode) {
objectNode.append(ch, start, length);
}
}
@Override
public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
}
@Override
public void processingInstruction(String target, String data) throws SAXException {
}
@Override
public void skippedEntity(String name) throws SAXException {
}
}
}
提供以下輸出
{"my":"custom","object":1,"here":[1,2,3]}
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<moo>
<obj><ObjectNode><my>custom</my><object>1</object><here>1</here><here>2</here><here>3</here></ObjectNode></obj>
</moo>
<Moo><obj><my>custom</my><object>1</object><here>1</here><here>2</here><here>3</here></obj></Moo>
objectNode = <ObjectNode><my>custom</my><object>1</object><here>1</here><here>2</here><here>3</here></ObjectNode>
{"my":"custom","object":"1","here":"3"}
因此,不幸的是,這是因為Jackson XML無法將“ here”解析為數組。 因此,我們應該以不同的方式對其進行序列化:
import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.TextNode;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.sun.xml.bind.marshaller.CharacterEscapeHandler;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.*;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import javax.xml.validation.Schema;
import javax.xml.validation.TypeInfoProvider;
import javax.xml.validation.Validator;
import javax.xml.validation.ValidatorHandler;
import java.io.File;
import java.io.IOException;
import java.io.Writer;
public class TestObjectNode {
@XmlRootElement(name = "moo")
@XmlAccessorType(XmlAccessType.FIELD)
static class Moo {
@JsonProperty("obj")
@XmlElement
@XmlJavaTypeAdapter(ObjMarshaller.class)
JsonNode obj;
}
static final ObjectMapper JSON_MAPPER = new ObjectMapper();
static final XmlMapper XML_MAPPER = (XmlMapper) new XmlMapper()
.disable(SerializationFeature.WRAP_ROOT_VALUE)
.disable(DeserializationFeature.UNWRAP_ROOT_VALUE);
public static void main(String[] args) throws Exception {
final String value = "{\"obj\": {\"my\": \"custom\", \"object\": 1, \"here\": [1, 2, 3] } }";
Moo moo = JSON_MAPPER.readValue(value, Moo.class);
System.out.println(moo.obj);
saveToFile(moo);
System.out.println(XML_MAPPER.writeValueAsString(moo));
moo = readFromFile();
System.out.println(moo.obj);
}
private static void saveToFile(Moo moo) throws Exception {
File file = new File("moo.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Moo.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.setProperty(CharacterEscapeHandler.class.getName(),
new CharacterEscapeHandler() {
@Override
public void escape(char[] chars, int i, int i1, boolean b, Writer writer) throws IOException {
writer.write(chars, i, i1);
}
});
jaxbMarshaller.marshal(moo, file);
jaxbMarshaller.marshal(moo, System.out);
}
private static Moo readFromFile() throws Exception {
File file = new File("moo.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Moo.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
MySchema mySchema = new MySchema();
unmarshaller.setSchema(mySchema);
Moo moo = (Moo) unmarshaller.unmarshal(file);
String objectNode = mySchema.validatorHandler.getObjectNodeString();
System.out.println("objectNode = " + objectNode);
JsonNode jsonNode = XML_MAPPER.readValue(objectNode, ObjectNode.class);
Object hereObject = jsonNode.get("here");
if (hereObject instanceof TextNode) {
String hereArray = ((TextNode) hereObject).asText().replace("<![CDATA[", "").replace("]]>", "");
ArrayNode here = JSON_MAPPER.readValue(hereArray, ArrayNode.class);
((ObjectNode) jsonNode).put("here", here);
}
moo.obj = jsonNode;
return moo;
}
private static class ObjMarshaller extends XmlAdapter<String, JsonNode> {
@Override
public JsonNode unmarshal(String v) throws Exception {
return null;
}
@Override
public String marshal(JsonNode v) throws Exception {
Object hereObject = v.get("here");
if (hereObject instanceof ArrayNode) {
ArrayNode here = (ArrayNode) hereObject;
final StringBuilder value = new StringBuilder("<![CDATA[").append('[');
for (int i = 0; i < here.size(); ++i) {
if (i > 0) {
value.append(',');
}
value.append(here.get(i));
}
value.append(']').append("]]>");
((ObjectNode) v).put("here", value.toString());
}
return XML_MAPPER.writeValueAsString(v);
}
}
static class MySchema extends Schema {
final ValidatorHandlerImpl validatorHandler = new ValidatorHandlerImpl();
@Override
public Validator newValidator() {
return null;
}
@Override
public ValidatorHandler newValidatorHandler() {
return validatorHandler;
}
}
static class ValidatorHandlerImpl extends ValidatorHandler {
private final StringBuilder objectNode = new StringBuilder();
private boolean insideObjectNode = false;
public String getObjectNodeString() {
return objectNode.toString();
}
@Override
public void setContentHandler(ContentHandler receiver) {
}
@Override
public ContentHandler getContentHandler() {
return null;
}
@Override
public void setErrorHandler(ErrorHandler errorHandler) {
}
@Override
public ErrorHandler getErrorHandler() {
return null;
}
@Override
public void setResourceResolver(LSResourceResolver resourceResolver) {
}
@Override
public LSResourceResolver getResourceResolver() {
return null;
}
@Override
public TypeInfoProvider getTypeInfoProvider() {
return null;
}
@Override
public void setDocumentLocator(Locator locator) {
}
@Override
public void startDocument() throws SAXException {
}
@Override
public void endDocument() throws SAXException {
}
@Override
public void startPrefixMapping(String prefix, String uri) throws SAXException {
}
@Override
public void endPrefixMapping(String prefix) throws SAXException {
}
@Override
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
if(localName.equals("ObjectNode")) {
insideObjectNode = true;
}
if (insideObjectNode) {
objectNode.append("<" + localName + ">");
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if (insideObjectNode) {
objectNode.append("</" + localName + ">");
}
if(localName.equals("ObjectNode")) {
insideObjectNode = false;
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if (insideObjectNode) {
objectNode.append(ch, start, length);
}
}
@Override
public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
}
@Override
public void processingInstruction(String target, String data) throws SAXException {
}
@Override
public void skippedEntity(String name) throws SAXException {
}
}
}
結果:
{"my":"custom","object":1,"here":[1,2,3]}
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<moo>
<obj><ObjectNode><my>custom</my><object>1</object><here><![CDATA[[1,2,3]]]></here></ObjectNode></obj>
</moo>
<Moo><obj><my>custom</my><object>1</object><here><![CDATA[[1,2,3]]]></here></obj></Moo>
objectNode = <ObjectNode><my>custom</my><object>1</object><here><![CDATA[[1,2,3]]]></here></ObjectNode>
{"my":"custom","object":"1","here":[1,2,3]}
這僅是示例,說明如何精確地完成任務。 您會看到它需要一些硬編碼,因此最好考慮另一種方法。 也許@XmlAnyElement可以幫助您。 或使用先前答案的文字變體。 另外,如果刪除CharacterEscapeHandler.class,則會收到轉義的xml字符串。
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