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我得到了错误http://jira.codehaus.org/browse/JACKSON-288,但它说该错误应该已在版本 1.6.2 中修复。

我参考了很多线程,例如
Jersey JSON 和 Date
如何通过 xml 将 Date(ActionScript 3) 转换为 java.util.Date?

我尝试了 1.12、1.14、1.17.1 版本,都不能在我这边工作。

@XmlRootElement(name="info")
@XmlAccessorType(XmlAccessType.NONE)
public class InfoVO  { 
    private int infoId;
    @XmlElement
    @XmlJavaTypeAdapter(DateAdapter.class)
    private Date createTime;
//...get/set

}

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.ws.rs.WebApplicationException;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class DateAdapter extends XmlAdapter<String, Date> {

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    @Override
    public String marshal(Date v) {
        return dateFormat.format(v);
    }

    @Override
    public Date unmarshal(String v) {
        try {
            return dateFormat.parse(v);
        } catch (ParseException e) {
            throw new WebApplicationException();
        }
    }
}


    <dependency>
        <groupId>javax.annotation</groupId>
        <artifactId>jsr250-api</artifactId>
        <version>1.0</version>
    </dependency>

但是根本无法调用 DateAdapter 并且出现异常,

2013-06-12 11:11:13.363:WARN::/xa/info/save/12121: org.codehaus.jackson.map.JsonMappingException: 无法从字符串值 '2013-06 构造 java.util.Date 的实例-08 08:00:00':不是有效的表示(错误:无法解析日期“2013-06-08 08:00:00”:不兼容任何标准形式(“yyyy-MM-dd'T' HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd "))| 在 [来源:java.io.StringReader@b0ff5e1;行:8,列:23](通过引用链:com.xchange.me.vo.InfoVO["createTime"])

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1 回答 1

1

我找到了根本原因,因为我添加了一个定制的 MessageBodyReader,

  @Provider
    @Consumes("application/json")
    public class CustomJsonReader<T> implements MessageBodyReader<T> {
        @Override
        public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
            return true;
        }

    @Override
    public T readFrom(Class<T> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders,
            InputStream entityStream) throws IOException, WebApplicationException {

        /*
         * Copy the input stream to String. Do this however you like. Here I use
         * Commons IOUtils.
         */
        StringWriter writer = new StringWriter();
        IOUtils.copy(entityStream, writer, "UTF-8");
        String json = writer.toString();

        /*
         * if the input stream is expected to be deserialized into a String,
         * then just cast it
         */
        if (String.class == genericType)
            return type.cast(json);

        /*
         * Otherwise, deserialize the JSON into a POJO type. You can use
         * whatever JSON library you want, here's a simply example using GSON.
         */
        ObjectMapper objectMapper = new ObjectMapper();
        return objectMapper.readValue(json, type);
    }
    }

所以当接收到json数据时,总是会进入readFrom方法,然后在return objectMapper.readValue(json, type)这行抛出异常;

所以我认为根本原因是 ObjectMapper.readValue 忽略了注解 @XmlJavaTypeAdapter

于 2013-06-12T14:02:35.727 回答