晚上好,
我是 Web 服务的新手,我只想编写一个简单的客户端,它只是从 REST 调用中获取响应。
我下载并添加了jersey-bundle-1.17.1.jar
到我的构建路径,我找到了一段工作代码,它对 url 进行 REST 调用并返回响应作为 String
.
import javax.ws.rs.core.MediaType;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
public class TestJerseyClient {
public static void main(String[] args) {
try {
Client client = Client.create();
WebResource webResource = client
.resource("http://path/to/service");
ClientResponse response = webResource
.accept(MediaType.APPLICATION_JSON)
.get(ClientResponse.class);
if (response.getStatus() != 200)
throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
String output = response.getEntity(String.class);
System.out.println("Output from Server .... \n");
System.out.println(output);
} catch (Exception e) {
e.printStackTrace();
}
}
}
但我不想通过字符串操作来获取我感兴趣的响应部分。
我更喜欢更结构化的方法,比如获取 Object
而不是字符串
(一个 JSON
对象,一个 Map<K,V>
对象,等等...)
尝试#1 -
Map<K,V>
Sep 15, 2013 2:46:13 AM com.sun.jersey.api.client.ClientResponse getEntity
SEVERE: A message body reader for Java class java.util.Map, and Java type java.util.Map<java.lang.String, java.lang.Object>, and MIME media type application/json; charset=UTF-8 was not found
Sep 15, 2013 2:46:13 AM com.sun.jersey.api.client.ClientResponse getEntity
SEVERE: The registered message body readers compatible with the MIME media type are:
application/json; charset=UTF-8 ->
com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App
com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$App
com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$App
*/* ->
com.sun.jersey.core.impl.provider.entity.FormProvider
com.sun.jersey.core.impl.provider.entity.StringProvider
com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
com.sun.jersey.core.impl.provider.entity.FileProvider
com.sun.jersey.core.impl.provider.entity.InputStreamProvider
com.sun.jersey.core.impl.provider.entity.DataSourceProvider
com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
com.sun.jersey.core.impl.provider.entity.ReaderProvider
com.sun.jersey.core.impl.provider.entity.DocumentProvider
com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
com.sun.jersey.core.impl.provider.entity.SourceProvider$SAXSourceReader
com.sun.jersey.core.impl.provider.entity.SourceProvider$DOMSourceReader
com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
com.sun.jersey.core.impl.provider.entity.XMLRootObjectProvider$General
com.sun.jersey.core.impl.provider.entity.EntityHolderReader
com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General
com.sun.jersey.api.client.ClientHandlerException: A message body reader for Java class java.util.Map, and Java type java.util.Map<java.lang.String, java.lang.Object>, and MIME media type application/json; charset=UTF-8 was not found
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:561)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:535)
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:696)
at com.sun.jersey.api.client.WebResource.access$300(WebResource.java:74)
at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:512)
at rest.TestJerseyClientAdvanced.main(TestJerseyClientAdvanced.java:36)
最佳答案
我建议您使用 Jackson 来(取消)编码 JSON 响应。这可以通过以下两个步骤完成。
第一步。使用与预期响应匹配的成员/对象名称创建一个 java bean。例如,MyResponse.class
第二步。从客户端响应中读取实体时使用 java bean。
private static ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
ClientResponse response = Client.create(clientConfig).
resource(uri).accept(MediaType.APPLICATION_JSON).
header("content-type", MediaType.APPLICATION_JSON).
get(MY_RESPONSE.class);
MyResponse output = response.getEntity(MyResponse.class);
关于java - 将 JSON 响应解析为对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18808018/