I have rest service that return arraylist of object,and I have implemented jersy restful client to execute it,but I have problem in converting ZonedDateTime type to json so I get this error
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 231 path $[0].lastmodifieddate
How can i fix this problem?
lastmodifieddate column in entity
@Column(name = "lastmodifieddate")
private ZonedDateTime lastmodifieddate;
//getter and setter
rest service
@RequestMapping(value = "/getScoreFactor",
method = RequestMethod.GET,
produces = MediaType.APPLICATION_JSON_VALUE)
@Timed
public List<Scorefactor> getScoreFactor() throws JSONException {
return scoreService.getScoreFactor();
}
jersy restful client
try {
Client client = Client.create();
WebResource webResource = client
.resource("http://localhost:8080/adap/api/getScoreFactor");
ClientResponse response = webResource.accept("application/json")
.get(ClientResponse.class);
String output = response.getEntity(String.class);
System.out.println("output--"+output);
Type listType = new TypeToken<List<Scorefactor>>() {}.getType();
List<Scorefactor> scorefactors = new Gson().fromJson(output,listType);
System.out.println(scorefactors);
} catch (Exception e) {
e.printStackTrace();
}
答案 0 :(得分:5)
我修好了,这是更新后的代码
Client client = Client.create();
WebResource webResource = client
.resource("http://localhost:8080/adap/api/getScoreFactor");
ClientResponse response = webResource.accept("application/json")
.get(ClientResponse.class);
String output = response.getEntity(String.class);
Gson gson = new GsonBuilder().registerTypeAdapter(ZonedDateTime.class, new JsonDeserializer<ZonedDateTime>() {
@Override
public ZonedDateTime deserialize(JsonElement json, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
return ZonedDateTime.parse(json.getAsJsonPrimitive().getAsString());
}
}).create();
Type listType = new TypeToken<List<Scorefactor>>() {}.getType();
List<Scorefactor> scorefactors = gson.fromJson(output,listType);
答案 1 :(得分:4)
至少有两种方法可以实现这一目标:
代码中的细微变化:
Type listType = new TypeToken<List<Scorefactor>>() {}.getType();
List<Scorefactor> scorefactors = new GsonBuilder()
.registerTypeAdapter(ZonedDateTime.class, GsonHelper.ZDT_DESERIALIZER)
.create()
.fromJson(output, listType);
助手类
class GsonHelper {
public static final JsonDeserializer<ZonedDateTime> ZDT_DESERIALIZER = new JsonDeserializer<ZonedDateTime>() {
@Override
public ZonedDateTime deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context) throws JsonParseException {
JsonPrimitive jsonPrimitive = json.getAsJsonPrimitive();
try {
// if provided as String - '2011-12-03T10:15:30+01:00[Europe/Paris]'
if(jsonPrimitive.isString()){
return ZonedDateTime.parse(jsonPrimitive.getAsString(), DateTimeFormatter.ISO_ZONED_DATE_TIME);
}
// if provided as Long
if(jsonPrimitive.isNumber()){
return ZonedDateTime.ofInstant(Instant.ofEpochMilli(jsonPrimitive.getAsLong()), ZoneId.systemDefault());
}
} catch(RuntimeException e){
throw new JsonParseException("Unable to parse ZonedDateTime", e);
}
throw new JsonParseException("Unable to parse ZonedDateTime");
}
};
}
客户端实施的变更:
ClientConfig config = new DefaultClientConfig();
config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
Client client = Client.create(config);
List<Scorefactor> result = client.resource("http://localhost:8080/adap/api/getScoreFactor"")
.accept("application/json")
.get(ClientResponse.class)
.getEntity(new GenericType<List<Scorefactor>>(){});
System.out.println(result);
您可能需要为此
导入jersey-json<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.19.1</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.19.1</version>
</dependency>
顺便说一下,你为什么要用1。*?
你的得分因子
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Scorefactor implements Serializable {
@Column(name = "lastmodifieddate")
@XmlElement(name = "lastmodifieddate")
@XmlJavaTypeAdapter(ZonedDateTimeToStringXmlAdapter.class)
private ZonedDateTime lastmodifieddate;
//...
ZonedDateTime from / to String(推荐)
public class ZonedDateTimeToStringXmlAdapter extends XmlAdapter<String, ZonedDateTime> {
@Override
public ZonedDateTime unmarshal(final String v) throws DateTimeParseException {
return ZonedDateTime.parse(v);
}
@Override
public String marshal(final ZonedDateTime v) throws Exception {
return v.toString();
}
}
ZonedDateTime from / to Long
public class ZonedDateTimeToLongXmlAdapter extends XmlAdapter<Long, ZonedDateTime> {
@Override
public ZonedDateTime unmarshal(final Long v) throws DateTimeParseException {
return ZonedDateTime.ofInstant(Instant.ofEpochMilli(v.longValue()), ZoneId.systemDefault());
}
@Override
public Long marshal(final ZonedDateTime v) throws Exception {
return Long.valueOf(v.toInstant().toEpochMilli());
}
}
您还可以构建自己的MessageBodyReader / MessageBodyWriter或使用其他实现,如Moxy。
我建议使用泽西2。*。
希望这在某种程度上有所帮助。祝你今天愉快。
答案 2 :(得分:3)
public static final Gson GSON = new GsonBuilder()
.registerTypeAdapter(ZonedDateTime.class, new TypeAdapter<ZonedDateTime>() {
@Override
public void write(JsonWriter out, ZonedDateTime value) throws IOException {
out.value(value.toString());
}
@Override
public ZonedDateTime read(JsonReader in) throws IOException {
return ZonedDateTime.parse(in.nextString());
}
})
.enableComplexMapKeySerialization()
.create();
答案 3 :(得分:0)
您发布的解决方案不起作用,因为ZonedDateTime的Json序列化不是Json原语,而是包含多个元素的Json对象。它需要发展,这里是一个完整的解决方案:
DrawMorganBit()