Java Jersey 演示应用程序中的 MediaType.APPLICATION_XML 和 MediaType.APPLICATION_JSON
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MediaType.APPLICATION_XML and MediaType.APPLICATION_JSON in a Jersey demo application
提问by user2737950
Once I got this Question Latest Jersey example does not work answered, I run into another curious problem:
一旦我得到这个问题，最新的泽西岛示例不起作用，我遇到了另一个奇怪的问题：
The server, GET methods work fine. I tested and added some test code for helloworld-pure-jax-rsexample, and esp. added a POST request for JSON:
服务器，GET 方法工作正常。我为helloworld-pure-jax-rs示例测试并添加了一些测试代码，尤其是。添加了 JSON 的 POST 请求：
package org.glassfish.jersey.examples.helloworld.jaxrs;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
@Path("helloworld")
public class HelloWorldResource
{
public static final String CLICHED_MESSAGE = "Hello World!";
@GET
@Produces(MediaType.TEXT_PLAIN)
public String getHello()
{
return CLICHED_MESSAGE;
}
@GET
@Produces(MediaType.APPLICATION_JSON)
public String getHelloJson()
{
return "{ \"message\":" + CLICHED_MESSAGE + "}";
}
@GET
@Produces(MediaType.TEXT_HTML)
public String getHelloHtml()
{
return "<html> " + "<title>" + "Hello Jersey" + "</title>" + "<body><h1>" + CLICHED_MESSAGE
+ "</body></h1>" + "</html> ";
}
@GET
@Produces(MediaType.TEXT_PLAIN)
@Path("/v2")
public String getHello2()
{
return CLICHED_MESSAGE + " v2";
}
@GET
@Produces(MediaType.TEXT_PLAIN)
@Path("/{id}")
public String getHelloId(@PathParam("id") String id)
{
return CLICHED_MESSAGE + " Parameter: " + id;
}
@GET
@Produces(MediaType.TEXT_PLAIN)
@Path("/id/{id : [a-zA-Z][a-zA-Z_0-9]}")
public String getHelloIdId(@PathParam("id") String id)
{
return CLICHED_MESSAGE + " Parameter: " + id;
}
@POST
@Consumes(MediaType.TEXT_PLAIN)
@Produces(MediaType.TEXT_PLAIN)
public Response test(String test)
{
if (test.equals("test"))
return Response.status(400).entity("Error: " + test).build();
return Response.status(200).entity(test).build();
}
@POST
@Path("/test")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response testJSON(Test test)
{
String result = "Test JSON created : " + test.getName() + "" + test.getAge();
// return result;
return Response.status(200).entity(result).build();
}
@POST
@Path("/test")
@Consumes(MediaType.APPLICATION_XML)
@Produces(MediaType.APPLICATION_XML)
public Response testXML(Test test)
{
String result = "Test XML created : " + test.getName() + "" + test.getAge();
// return result;
return Response.status(200).entity(result).build();
}
}
Here ist the rest of the classes:
这是其余的课程：
package org.glassfish.jersey.examples.helloworld.jaxrs;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import javax.ws.rs.core.UriBuilder;
import javax.ws.rs.ext.RuntimeDelegate;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
/**
* Hello world application using only the standard JAX-RS API and lightweight
* HTTP server bundled in JDK.
*
* @author Martin Matula (martin.matula at oracle.com)
*/
@SuppressWarnings("restriction")
public class App
{
/**
* Starts the lightweight HTTP server serving the JAX-RS application.
*
* @return new instance of the lightweight HTTP server
* @throws IOException
*/
static HttpServer startServer() throws IOException
{
// create a new server listening at port 8080
HttpServer server = HttpServer.create(new InetSocketAddress(getBaseURI().getPort()), 0);
// create a handler wrapping the JAX-RS application
HttpHandler handler = RuntimeDelegate.getInstance().createEndpoint(new JaxRsApplication(),
HttpHandler.class);
// map JAX-RS handler to the server root
server.createContext(getBaseURI().getPath(), handler);
// start the server
server.start();
return server;
}
public static void main(String[] args) throws IOException
{
System.out.println("\"Hello World\" Jersey Example Application");
HttpServer server = startServer();
System.out.println("Application started.\n" + "Try accessing " + getBaseURI()
+ "helloworld in the browser.\n" + "Hit enter to stop the application...");
System.in.read();
server.stop(0);
}
private static int getPort(int defaultPort)
{
final String port = System.getProperty("jersey.config.test.container.port");
if (null != port)
{
try
{
return Integer.parseInt(port);
}
catch (NumberFormatException e)
{
System.out.println("Value of jersey.config.test.container.port property"
+ " is not a valid positive integer [" + port + "]."
+ " Reverting to default [" + defaultPort + "].");
}
}
return defaultPort;
}
/**
* Gets base {@link URI}.
*
* @return base {@link URI}.
*/
public static URI getBaseURI()
{
return UriBuilder.fromUri("http://localhost/").port(getPort(8080)).build();
}
}
public class Test
{
public int age = 0;
public String name = "";
/**
*
*/
public Test()
{
super();
}
/**
* @param age
*/
public Test(int age)
{
super();
this.age = age;
}
/**
* @param name
*/
public Test(String name)
{
super();
this.name = name;
}
/**
* @param name
* @param age
*/
public Test(String name, int age)
{
super();
this.name = name;
this.age = age;
}
public int getAge()
{
return age;
}
public String getName()
{
return name;
}
public void setAge(int age)
{
this.age = age;
}
public void setName(String name)
{
this.name = name;
}
}
package org.glassfish.jersey.examples.helloworld.jaxrs;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.core.Application;
public class JaxRsApplication extends Application
{
private final Set<Class<?>> classes;
public JaxRsApplication()
{
HashSet<Class<?>> c = new HashSet<Class<?>>();
c.add(HelloWorldResource.class);
classes = Collections.unmodifiableSet(c);
}
@Override
public Set<Class<?>> getClasses()
{
return classes;
}
}
This works fine for the plain text post message, but fpr the json (MediaType.APPLICATION_JSON )and xml part (MediaType.APPLICATION_XML) it fails stating not a supported media type. Any idea what could be wrong?
这适用于纯文本帖子消息，但 fpr json (MediaType.APPLICATION_JSON) 和 xml 部分 (MediaType.APPLICATION_XML) 它未能说明不支持的媒体类型。知道有什么问题吗？
采纳答案by Paul Samsotha
JAX-RS has a bunch of built-in handlers that can marshal to and from a few different specific Java types.
JAX-RS 有一堆内置处理程序，可以在几个不同的特定 Java 类型之间进行编组。
Once we start dealing with custom data-binding (marshalling/unmarshalling to Java objects), we are in a different ball game. We now require some other MessageBodyWritersand MesageBodyReaders.
一旦我们开始处理自定义数据绑定（对 Java 对象进行编组/解组），我们就处于不同的球赛中。我们现在需要一些其他的MessageBodyWriters和MesageBodyReaders。
Fortunately, there are already readers and writers available for XML and JSON data-binding. JAX-RS comes with a standard XML marshalling/unmarshalling, with one caveat.. we must use JAXBannotations. So for your Testclass, assuming it's like this
幸运的是，已经有可用于 XML 和 JSON 数据绑定的读取器和写入器。JAX-RS 带有标准的 XML 编组/解组，有一个警告......我们必须使用JAXB注释。所以对于你的Test班级，假设它是这样的
public class Test {
private String name;
private int age;
public String getName() { return name; }
public void setName(String name) { this.name = name;}
public int getAge() { return age; }
public void setAge(int age) { this.age = age; }
}
to make allow the JAXB providerto unmarshall/marshall, we should provide, at minimum, an @XmlRootElement
为了允许 JAXB提供者解组/编组，我们应该至少提供一个@XmlRootElement
@XmlRootElement
public class Test {
....
}
Doing this should allow the XML to work.
这样做应该允许 XML 工作。
As far as the JSON, JSON binding is not a standard par of the specification, but we can simply add a dependency to the project, that will automatically register the needed provider to handle JSON binding. You can look at the pom.xml for the json-moxyexample. You will see this needed dependency
就 JSON 而言，JSON 绑定不是规范的标准部分，但我们可以简单地向项目添加一个依赖项，它将自动注册所需的提供程序来处理 JSON 绑定。您可以查看json-moxy示例的 pom.xml 。你会看到这个需要的依赖
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId>
</dependency>
What the dependency allows application to do, is marshal/unmarshal jSON to/from our Java objects, using the JAXB annotations. So just by adding this dependency to the pom.xml. The application should work. Just tested.
依赖项允许应用程序执行的操作是使用 JAXB 注释对 Java 对象进行编组/解组 JSON。因此，只需将此依赖项添加到pom.xml. 该应用程序应该可以工作。刚刚测试。
