[英]JAX-RS jersey ExceptionMapper: How to know the method who threw the exception
我正在使用 JAX-RS jersey ExceptionMapper,我想知道是否有办法在方法 toResponse() 内部知道哪个方法(来自 API)引发了异常。
示例(伪代码)
@javax.ws.rs.Path(“/bookstore/books/{bookID}”)
public class Book {
@javax.ws.rs.GET
public String informationMethod(String user) {
...
throw new Exception("Error");
....
}
}
@Provider
public class SomeMapper implements ExceptionMapper<Exception> {
@Override
public Response toResponse(Exception ex) {
//a way to get the method name that threw the exception.
//In the above example is: informationMethod.
String methodName = //informationMethod
return Response.status(500).entity(ex.getMessage()).type("text/plain")
.build();
}
}
您可以从上下文向ExcpetionMapper
提供一些信息。
package your.rest.pckg;
import java.lang.reflect.Method;
import java.net.URI;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Path;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriBuilder;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
@Provider
public class SomeMapper
implements ExceptionMapper<Exception>
{
@Context private HttpServletRequest request;
@Context private HttpServletResponse response;
@Context private ResourceInfo resourceInfo;
@Context private UriInfo uriInfo;
@Override
public Response toResponse( Exception ex )
{
String method = request.getMethod();
String pathInfo = request.getPathInfo();
Class<?> resourceClass = resourceInfo.getResourceClass();
Method resourceMethod = resourceInfo.getResourceMethod();
URI resourcePath = getResourcePath( resourceClass, resourceMethod );
URI requestUri = uriInfo.getRequestUri();
MultivaluedMap<String, String> pathParams = uriInfo.getPathParameters();
MultivaluedMap<String, String> queryParams = uriInfo.getQueryParameters();
// define your object to provide data through response
Object responseEntity = ex.getMessage();
// do your stuff
return Response.status( Response.Status.INTERNAL_SERVER_ERROR )
.entity( responseEntity )
.type( MediaType.APPLICATION_JSON )
.build();
}
private static URI getResourcePath( Class<?> clazz, Method method )
{
if ( clazz == null || !clazz.isAnnotationPresent( Path.class ) )
{
return null;
}
UriBuilder builder = UriBuilder.fromResource( clazz );
if ( method != null && method.isAnnotationPresent( Path.class ) )
{
builder.path( method );
}
return builder.build();
}
}
看到
除了Excpetion
您还可以映射Throwable
。
要通过WebApplicationExcpetion
只需在toResponse()
主体的toResponse()
处添加以下if子句:
if (ex instanceof WebApplicationException)
{
return (( (WebApplicationException) ex ).getResponse());
}
您还可以使用资源类Book
所有@Context
字段。
您可以使用以下代码从引发异常的地方记录异常
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
@Provider
public class RuntimeExceptionMapper implements ExceptionMapper<RuntimeException> {
private static final Logger logger = Logger.getLogger(yourmodule);
@Override
public Response toResponse(RuntimeException ex) {
// TODO Auto-generated method stub
logger.log(ex);
return Response.status(Status.BAD_REQUEST).entity(ex.getMessage()).build();
}
}
插入您的ExceptionMapper映射器:
@Context private ResourceInfo resourceInfo;
按照建议进行操作,并执行以下操作以获取方法名称:
resourceInfo.getResourceMethod()
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