在GAE上上传Resteasy multipart/data-form文件

Question

我正在尝试使用resteasy 2.0.1.GA将带有文件的表单上传到GAE应用程序中,使用我如何使用jax-rs上传多部分/表单文件建议的方法 ？

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!

Answer 1

我刚遇到这个问题并查看了mime4j的Message构造函数的源代码.它得到TempFileStorageProvider调用DefaultStorageProvider.getInstance().您可以通过调用以下命令将默认值更改为不写入文件系统的默认值:

DefaultStorageProvider.setInstance(new MemoryStorageProvider());

那是org.apache.james.mime4j.storage.DefaultStorageProvider.

感谢使用@MultipartForm的简洁示例!

Answer 2

好吧,我找到了它的随处 - 我正在使用apache commons-upload with RESTEasy,通过将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";
    } 
}

我仍然宁愿找到一个RESTEasy解决方案,以避免围绕fileIterator编译代码.