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[英]A message body reader for Java class java.util.List, and Java type java.util.List<>, and MIME media type text/html was not found
[英]A message body reader for Java class java.util.List,and Java type java.util.List<Em>
未找到 Java 类 java.util.List、Java 类型 java.util.List<org.Employee> 和 MIME 媒体类型 application/json 的消息正文读取器。
我浏览了所有相关的错误链接,但没有任何效果。
Output from client is like this
<employees>
<employee>
<empNo>E02</empNo>
<empName> New Emp1</empName>
<position>Manager</position>
</employee>
<employee>
<empNo>E01</empNo>
<empName>SMITH</empName>
<position>Clerk</position>
</employee>
<employee>
<empNo>E03</empNo>
<empName>SARATH</empName>
<position>AMD</position>
</employee>
</employees>
pom.xml
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.19.2</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-core</artifactId>
<version>1.19.2</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.19.2</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.19.2</version>
</dependency>
在这里,我有一个从客户端获取 xml 的 java 类。
import java.util.List;
import javax.ws.rs.core.MediaType;
import org.restJersyClint.JersyRestClient.modal.Employee;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.GenericType;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.WebResource.Builder;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
public class GetJsonAsList
{
public static void main(String[] args)
{
ClientConfig clientConfig = new DefaultClientConfig();
Client client = Client.create(clientConfig);
WebResource webResourse = client.resource("http://localhost:8080/RestFulCRUD/rest/employee");
Builder builder = webResourse.accept(MediaType.APPLICATION_JSON)//
.header("content-type", MediaType.APPLICATION_JSON);
ClientResponse response = builder.get(ClientResponse.class);
//Status 200 is successful
if(response.getStatus()!=200)
{
System.out.println("Failed with HTTP Error Code: " + response.getStatus());
String error = response.getEntity(String.class);
System.out.println("Error: " + error);
return;
}
GenericType<List<Employee>> generic = new GenericType<List<Employee>>(){};
//from this instance it takes to exception
List<Employee> list = response.getEntity(generic);
System.out.println("Output from server... \n");
for(Employee emp : list)
{
System.out.println("---");
System.out.println("Emp No..." + emp.getEmpNo());
System.out.println("Emp Name..." + emp.getEmpName());
System.out.println("Position..." + emp.getPosition());
}
}
}
此时我收到错误
List<Employee> list = response.getEntity(generic);
雇员.java
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Employee
{
private String empNo;
private String empName;
private String position;
public Employee()
{
}
public Employee(String empNo, String empName, String position)
{
super();
this.empNo = empNo;
this.empName = empName;
this.position = position;
}
public String getEmpNo() {
return empNo;
}
public void setEmpNo(String empNo) {
this.empNo = empNo;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
}
在控制台中,
Aug 27, 2020 10:03:29 AM com.sun.jersey.api.client.ClientResponse getEntity
SEVERE: A message body reader for Java class java.util.List, and Java type java.util.List<org.restJersyClint.JersyRestClient.modal.Employee>, and MIME media type application/json was not found
Aug 27, 2020 10:03:34 AM com.sun.jersey.api.client.ClientResponse getEntity
SEVERE: The registered message body readers compatible with the MIME media type are:
application/json ->
com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App
com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$App
com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$App
com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$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.json.impl.provider.entity.JSONArrayProvider$General
com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$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.json.impl.provider.entity.JacksonProviderProxy
Exception in thread "main" com.sun.jersey.api.client.ClientHandlerException: A message body reader for Java class java.util.List, and Java type java.util.List<org.restJersyClint.JersyRestClient.modal.Employee>, and MIME media type application/json was not found
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:630)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:604)
at org.restJersyClint.JersyRestClient.GetJsonAsList.main(GetJsonAsList.java:46)
我搜索并浏览了所有相关链接,但无法解决。 请帮我解决这个问题。 提前致谢。
这里的问题是响应 pojo 文件需要解析为 JSON 并且需要 MessageBodyReader。(默认支持 XML)
您必须为客户端显式设置 POJO 映射配置。
要解决此问题,您应该添加以下代码行(第 2 行)。
ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE); // <----- set the json configuration POJO MAPPING for JSON reponse paring
Client client = Client.create(clientConfig);
还要对 Employee.java 以及以下进行更改
//@XmlRootElement // <-- comment this
public class Employee
我建议您也阅读 JAX-RS 管道流程,以获得更清晰的理解。
另外关于 maven 依赖项。由于您仅使用 json parser 实现 jersey 客户端(1.x),因此您只需要 pom.xml 中的以下依赖项。
<dependencies>
<!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-client -->
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-client</artifactId>
<version>1.19.1</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.19.1</version>
</dependency>
</dependencies>
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