0
我一直在编写RESTful Web服务。MessageBodyWriter在泽西岛的自定义媒体类型
- Glassfish的3(基于Java 6)
- JDK V7
- Eclipse的EE开普勒
- 泽西(Glassfish的部分)
我创建:我使用的技术定制POJO定制媒体类型:
public final class SimpleEntity{
private int value = 0;
private String stValue = "";
public SimpleEntity(){}
public SimpleEntity(int value, String stValue) {
super();
this.value = value;
this.stValue = stValue;
}
... getters, setters
我的资源m ethod:
@POST
@Produces("application/entity")
@Path("/getSimpleEntityNeedsProvider")
public Response getSimpleEntityNeedsProvider(){
SimpleEntity entity = new SimpleEntity(47, "String input value");
return Response.ok().entity(entity).build();
}
我的消息主体作家:
@Provider
@Produces("application/entity")
public final class SimpleEntityBodyWriterProvider implements MessageBodyWriter<SimpleEntity>{
private static Logger log = Logger.getLogger(Class.class);
@Override
public long getSize(SimpleEntity arg0, Class arg1, Type arg2, Annotation[] arg3,
MediaType arg4) {
return -1;
}
@Override
public boolean isWriteable(Class arg0, Type arg1, Annotation[] arg2,
MediaType arg3) {
if(arg0.equals(SimpleEntity.class)){
return true;
}
return false;
}
@Override
public void writeTo(SimpleEntity entity, Class arg1, Type arg2, Annotation[] arg3,
MediaType media, MultivaluedMap arg5, OutputStream out)
throws IOException, WebApplicationException {
log.log(Level.INFO, "Input to SimpleEntityBodyWriterProvider: "+entity.getValue());
out.write(entity.getValue());
out.write(entity.getStValue().getBytes());
}
}
我的服务客户端:
private void getSimpleEntityNeedsProvider(String strUrl, String method){
HttpURLConnection connect = null;
try {
URL url = new URL(strUrl);
connect = (HttpURLConnection)url.openConnection();
connect.setRequestProperty("Accept", "application/entity");// Accept from server
connect.setRequestMethod(method);
connect.connect();
InputStream input = connect.getInputStream();
int size = input.available();
byte[] b = new byte[size];
input.read(b, 0, size);
System.out.println("From resource: "+new String(b));
System.out.println("Status: "+connect.getResponseCode()+" : "+connect.getResponseMessage());
}
catch(IOException e){
e.printStackTrace();
}
}
根路径:
@ApplicationPath("/rest/v6")
public class AppV6 extends Application {
private static Logger log = Logger.getLogger(Class.class.getName());
public AppV6(){}
@Override
public Set<Class<?>> getClasses(){
Set<Class<?>> cls = new HashSet<>();
cls.add(SimpleEntity.class);
cls.add(SimpleEntityBodyWriterProvider.class);
return cls;
}
}
当我运行从我的服务客户端的应用程序,我得到以下输出:
From resource: /String input value
Status: 200 : OK
我想,才能有更好的理解基于REST /泽西服务的使用自定义介质类型和MessageBodyWriter
。 我有的问题:
- 这是涉及/编码自定义媒体类型的正确方法吗?
- 我在服务客户端收到的数据不完全正确。也就是说,而不是“/”这个值需要是一个数字47.所以,为什么我得到一个字符而不是数字?
- 正如您在资源方法中看到的,我向定制POJO输入了两个值:数字和字符串。在服务客户端,我有
InputStream
。我得到整体数据的字节数组。我怎样才能读取数据作为单独的数据块,在我的POJO中编码为字段?我可以逐字节读取,但这是否正确?