未找到 Java 类 java.util.ArrayList...和 MIME 媒体类型 text/xml 的消息正文编写器 [英] A message body writer for Java class java.util.ArrayList...and MIME media type text/xml was not found
问题描述
我使用 Jersey 来构建 REST 服务,并希望以 XML 形式返回 Collection
.
Im using Jersey to build a REST Service and want to return a Collection<String>
as XML.
@GET
@Produces(MediaType.TEXT_XML)
@Path("/directgroups")
public Response getDirectGroupsForUser(@PathParam("userId") String userId) {
try {
Collection<String> result = service.getDirectGroupsForUser(userId, null, true);
// return result; //first try
// return result.toArray(new String[0]); //second try
return Response.ok().type(MediaType.TEXT_XML).entity(result).build(); //third try
} catch (UserServiceException e) {
LOGGER.error(e);
throw new RuntimeException(e.getMessage());
}
}
但我的尝试失败,出现以下异常:
but my attempts fail with the following exception:
javax.ws.rs.WebApplicationException:com.sun.jersey.api.MessageException:Java 类 java.util.ArrayList、Java 类型类 java.util.ArrayList 和 MIME 媒体类型 text/的消息正文编写器找不到 xml
javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class java.util.ArrayList, and Java type class java.util.ArrayList, and MIME media type text/xml was not found
我通过谷歌发现的异常的所有结果都处理返回 text/json 而不是 text/xml 就像我的情况一样.
and all results to that exception I found via google dealt with returning text/json instead of text/xml like in my situation.
谁能帮帮我?我想,如果我使用响应,那将是我在 XML 中的根元素和我的集合中的字符串元素列表..
Can anyone help me? I thought, if I use a Response, that would be my root element in XML and my collection a list of string elements in it..
推荐答案
注意:虽然这个答案有效,anar 的回答更好.
NOTE: Although this answer works, anar's answer is better.
您应该尝试使用 JAXB 注释类来解决您的问题.您可以将方法更改为:
You should try to use a JAXB annotated class to solve your problem. You could change your method to this:
@GET
@Produces(MediaType.TEXT_XML)
@Path("/directgroups")
public Groups getDirectGroupsForUser(@PathParam("userId") String userId) {
try {
Groups groups = new Groups();
groups.getGroup().addAll(service.getDirectGroupsForUser(userId, null, true));
return groups;
} catch (UserServiceException e) {
LOGGER.error(e);
throw new RuntimeException(e.getMessage());
}
}
然后为您的组创建一个 JAXB 注释类.我使用这个答案中描述的过程为您提供了一个生成的类.以下是它将生成的文档示例:
And then create a JAXB annotated class for your groups. I have included a generated class for you, using the process described in this answer. Here is an example of the documents that it will produce:
<groups>
<group>Group1</group>
</group>Group2</group>
</groups>
这是生成的类:
package example;
import java.util.ArrayList;
import java.util.List;
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.XmlType;
/**
* <p>Java class for anonymous complex type.
*
* <p>The following schema fragment specifies the expected content contained within this class.
*
* <pre>
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element ref="{}group" maxOccurs="unbounded"/>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </pre>
*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"group"
})
@XmlRootElement(name = "groups")
public class Groups {
@XmlElement(required = true)
protected List<String> group;
/**
* Gets the value of the group property.
*
* <p>
* This accessor method returns a reference to the live list,
* not a snapshot. Therefore any modification you make to the
* returned list will be present inside the JAXB object.
* This is why there is not a <CODE>set</CODE> method for the group property.
*
* <p>
* For example, to add a new item, do as follows:
* <pre>
* getGroup().add(newItem);
* </pre>
*
*
* <p>
* Objects of the following type(s) are allowed in the list
* {@link String }
*
*
*/
public List<String> getGroup() {
if (group == null) {
group = new ArrayList<String>();
}
return this.group;
}
}
这篇关于未找到 Java 类 java.util.ArrayList...和 MIME 媒体类型 text/xml 的消息正文编写器的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!