我正在尝试使用resteasy 2.0.1.GA将包含文件的表单上传到GAE应用程序中，使用How do I do a multipart/form file upload with jax-rs?建议的方法
的index.html
<form action="/rest/upload" method="post" enctype="multipart/form-data">
<input type="text" name="name" />
<input type="file" name="file" />
<input type="submit" />
</form>
Rest.java
@Path("")
public class Rest {
@POST
@Path("/rest/upload")
@Consumes("multipart/form-data")
public String postContent(@MultipartForm UploadForm form) {
System.out.println(form.getData().length);
System.out.println(form.getName());
return "Done";
}
}
UploadForm.java
public class UploadForm {
private String name;
private byte[] data;
@FormParam("name")
public void setPath(String name) {
this.name = name;
}
public String getName() {
return name;
}
@FormParam("file")
public void setContentData(byte[] data) {
this.data = data;
}
public byte[] getData() {
return data;
}
}
但是我收到以下错误消息（可能是由于RESTEasy Provider的implmenetation使用临时文件来处理输入流）：
HTTP ERROR 500
Problem accessing /files/service/upload. Reason:
java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details.
Caused by:
java.lang.NoClassDefFoundError: java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
at org.apache.james.mime4j.storage.TempFileStorageProvider$TempFileStorageOutputStream.<init>(TempFileStorageProvider.java:117)
at org.apache.james.mime4j.storage.TempFileStorageProvider.createStorageOutputStream(TempFileStorageProvider.java:107)
at org.apache.james.mime4j.storage.ThresholdStorageProvider$ThresholdStorageOutputStream.write0(ThresholdStorageProvider.java:113)
at org.apache.james.mime4j.storage.StorageOutputStream.write(StorageOutputStream.java:119)
at org.apache.james.mime4j.codec.CodecUtil.copy(CodecUtil.java:43)
at org.apache.james.mime4j.storage.AbstractStorageProvider.store(AbstractStorageProvider.java:57)
at org.apache.james.mime4j.message.BodyFactory.textBody(BodyFactory.java:167)
at org.apache.james.mime4j.message.MessageBuilder.body(MessageBuilder.java:148)
at org.apache.james.mime4j.parser.MimeStreamParser.parse(MimeStreamParser.java:101)
at org.apache.james.mime4j.message.Message.<init>(Message.java:141)
at org.apache.james.mime4j.message.Message.<init>(Message.java:100)
at org.jboss.resteasy.plugins.providers.multipart.MultipartInputImpl.parse(MultipartInputImpl.java:76)
at org.jboss.resteasy.plugins.providers.multipart.MultipartFormAnnotationReader.readFrom(MultipartFormAnnotationReader.java:55)
at org.jboss.resteasy.core.interception.MessageBodyReaderContextImpl.proceed(MessageBodyReaderContextImpl.java:105)
at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.read(GZIPDecodingInterceptor.java:46)
at org.jboss.resteasy.core.interception.MessageBodyReaderContextImpl.proceed(MessageBodyReaderContextImpl.java:108)
at org.jboss.resteasy.core.messagebody.ReaderUtility.doRead(ReaderUtility.java:111)
at org.jboss.resteasy.core.messagebody.ReaderUtility.doRead(ReaderUtility.java:93)
at org.jboss.resteasy.core.MessageBodyParameterInjector.inject(MessageBodyParameterInjector.java:146)
at org.jboss.resteasy.core.MethodInjectorImpl.injectArguments(MethodInjectorImpl.java:114)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:137)
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:252)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:217)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:206)
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:514)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:491)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:120)
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:200)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:48)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:43)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
...
是否有人遇到过GAE和RESTEasy这个问题？有人解决了吗？在任何地方我找不到任何关于这个问题的提及。 谢谢！
答案 0 :(得分：8)
我刚遇到这个问题并查看了mime4j的Message构造函数的源代码。它通过调用TempFileStorageProvider获得DefaultStorageProvider.getInstance()。您可以通过调用：
DefaultStorageProvider.setInstance(new MemoryStorageProvider());
那是org.apache.james.mime4j.storage.DefaultStorageProvider。
感谢使用@MultipartForm的简洁示例！
答案 1 :(得分：7)
好吧，我找到了它的随处 - 我正在使用apache commons-upload with RESTEasy，将HttpServletRequest注入RESTEasy方法（并使用commons-IO将流转换为字节数组/字符串） 。所有软件包都支持应用引擎。
@Path("")
public class Rest {
@POST
@Path("/rest/upload")
public String postContent(@Context HttpServletRequest request) {
ServletFileUpload upload = new ServletFileUpload();
FileItemIterator fileIterator = upload.getItemIterator(request);
while (fileIterator.hasNext()) {
FileItemStream item = fileIterator.next();
if ("file".equals(item.getFieldName())){
byte[] content = IOUtils.toByteArray(item.openStream())
// Save content into datastore
// ...
} else if ("name".equals(item.getFieldName())){
String name=IOUtils.toString(item.openStream());
// Do something with the name string
// ...
}
}
return "Done";
}
}
我宁愿找到一个RESTEasy解决方案，以避免围绕fileIterator编译代码。
答案 2 :(得分：1)
看起来mime4j库试图写出临时文件，这在app引擎上是不允许的。 mime4j可以配置为使用内存存储提供程序，但我不知道RESTeasy使用它是否允许该配置。
答案 3 :(得分：1)
要在RESTEasy中使用MemoryStorageProvider，您可以设置以下系统属性：
-Dorg.apache.james.mime4j.defaultStorageProvider=org.apache.james.mime4j.storage.MemoryStorageProvider
我尝试使用RESTEasy 2.3.1.GA和jboss-as-7.1.0.Final。
以前的RESTEasy版本中还存在一个错误，其中临时文件未被删除（https://issues.jboss.org/browse/RESTEASY-681）。使用MemoryStorageProvider是一种解决方法。
答案 4 :(得分：0)
我尝试使用MemoryStorageProvider。但看起来它对大多数文件都不起作用。
我想出了另一个使用谷歌云存储扩展AbstractStorageProvider的解决方案，它运行良好。
https://gist.github.com/azimbabu/0aef75192c385c6d4461118583b6d22f
import com.google.appengine.tools.cloudstorage.GcsFileOptions;
import com.google.appengine.tools.cloudstorage.GcsFilename;
import com.google.appengine.tools.cloudstorage.GcsInputChannel;
import com.google.appengine.tools.cloudstorage.GcsOutputChannel;
import com.google.appengine.tools.cloudstorage.GcsService;
import lombok.extern.slf4j.Slf4j;
import org.apache.james.mime4j.storage.AbstractStorageProvider;
import org.apache.james.mime4j.storage.Storage;
import org.apache.james.mime4j.storage.StorageOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.Channels;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.UUID;
/**
* A {@link org.apache.james.mime4j.storage.StorageProvider} that stores the data in google cloud storage files. The files
* are stored in a user specified bucket. User of this class needs to supply the google cloud storage service and bucket name.
*
* This implementation is based on {@link org.apache.james.mime4j.storage.TempFileStorageProvider}
* <p>
* Example usage:
*
* <pre>
* final String bucketName = "my-bucket";
* DefaultStorageProvider.setInstance(new GcsStorageProvider(gcsService, bucketName));
* </pre>
*/
@Slf4j
public class GcsStorageProvider extends AbstractStorageProvider {
private static final int FETCH_SIZE_MB = 4 * 1024 * 1024;
private static final String PUBLIC_READ = "public-read";
private static final GcsFileOptions gcsFileOpts = new GcsFileOptions.Builder().acl(PUBLIC_READ).mimeType("text/csv").build();
private final GcsService gcsService;
private final String bucketName;
/**
* Creates a new <code>GcsStorageProvider</code> using the given
* values.
*
* @param gcsService an implementation of {@link GcsService}
* @param bucketName google cloud storage bucket name to use.
*/
public GcsStorageProvider(final GcsService gcsService, final String bucketName) {
this.gcsService = gcsService;
this.bucketName = bucketName;
}
@Override
public StorageOutputStream createStorageOutputStream() throws IOException {
return new GcsStorageProvider.GcsStorageOutputStream(gcsService, bucketName);
}
private static final class GcsStorage implements Storage {
private final GcsService gcsService;
private GcsFilename gcsFilename;
private static final Set<GcsFilename> filesToDelete = new HashSet();
public GcsStorage(final GcsService gcsService, final GcsFilename gcsFilename) {
this.gcsService = gcsService;
this.gcsFilename = gcsFilename;
}
@Override
public InputStream getInputStream() throws IOException {
if (this.gcsFilename == null) {
throw new IllegalStateException("storage has been deleted");
} else {
final GcsInputChannel readChannel = gcsService.openPrefetchingReadChannel(gcsFilename, 0, FETCH_SIZE_MB);
return Channels.newInputStream(readChannel);
}
}
@Override
public void delete() {
synchronized(filesToDelete) {
if (this.gcsFilename != null) {
filesToDelete.add(this.gcsFilename);
this.gcsFilename = null;
}
final Iterator iterator = filesToDelete.iterator();
while(iterator.hasNext()) {
GcsFilename filename = (GcsFilename)iterator.next();
try {
if (gcsService.delete(filename)) {
iterator.remove();
}
} catch (final IOException ex) {
log.error(ex.getMessage(), ex);
}
}
}
}
}
private static final class GcsStorageOutputStream extends StorageOutputStream {
private final GcsService gcsService;
private GcsFilename gcsFilename;
private final OutputStream outputStream;
public GcsStorageOutputStream(final GcsService gcsService, final String bucketName) throws IOException {
this.gcsService = gcsService;
final String fileName = UUID.randomUUID().toString();
this.gcsFilename = new GcsFilename(bucketName, fileName);
GcsOutputChannel gcsOutputChannel = gcsService.createOrReplace(gcsFilename, gcsFileOpts);
this.outputStream = Channels.newOutputStream(gcsOutputChannel);
}
@Override
protected void write0(byte[] buffer, int offset, int length) throws IOException {
this.outputStream.write(buffer, offset, length);
}
@Override
protected Storage toStorage0() throws IOException {
return new GcsStorage(gcsService, gcsFilename);
}
@Override
public void close() throws IOException {
super.close();
this.outputStream.close();
}
}
}
答案 5 :(得分：0)
我刚刚将resteasy-multipart-provider jar从2.2.0.GA升级到3.1.4.Final。 我们必须明确地调用close方法。它将负责删除m4jxxxx.tmp文件。
请参阅@docs http://docs.jboss.org/resteasy/docs/3.1.4.Final/userguide/html_single/index.html
<?php
function cmp($a, $b)
{
if ($a['custom_price'] == $b['custom_price']) {
return 0;
}
return ($a['custom_price'] < $b['custom_price']) ? -1 : 1;
}