Java tutorial
// --- BEGIN COPYRIGHT BLOCK --- // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; version 2 of the License. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License along // with this program; if not, write to the Free Software Foundation, Inc., // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. // // (C) 2017 Red Hat, Inc. // All rights reserved. // --- END COPYRIGHT BLOCK --- package com.netscape.certsrv.client; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.lang.annotation.Annotation; import java.lang.reflect.Type; import javax.ws.rs.Consumes; import javax.ws.rs.Produces; import javax.ws.rs.WebApplicationException; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.MultivaluedMap; import javax.ws.rs.core.StreamingOutput; import javax.ws.rs.ext.MessageBodyReader; import javax.ws.rs.ext.MessageBodyWriter; import javax.ws.rs.ext.Provider; import org.apache.commons.io.IOUtils; @Provider @Consumes(MediaType.APPLICATION_OCTET_STREAM) @Produces(MediaType.APPLICATION_OCTET_STREAM) public class PKIRESTProvider implements MessageBodyReader<StreamingOutput>, MessageBodyWriter<StreamingOutput> { @Override public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { return true; } @Override public StreamingOutput readFrom(Class<StreamingOutput> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException, WebApplicationException { final File file = File.createTempFile("PKIRESTProvider-", ".tmp"); file.deleteOnExit(); FileOutputStream out = new FileOutputStream(file); IOUtils.copy(entityStream, out); return new StreamingOutput() { @Override public void write(OutputStream out) throws IOException, WebApplicationException { FileInputStream in = new FileInputStream(file); IOUtils.copy(in, out); } public void finalize() { file.delete(); } }; } @Override public long getSize(StreamingOutput out, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { return -1; } @Override public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { return true; } @Override public void writeTo(StreamingOutput so, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException { so.write(entityStream); } }