使用UrlConnection测试多部分/相关POST请求 - 找不到MIME边界： - the_photo

Question

所以，我搜索了整个网络，但是找不到为什么这个不起作用。到目前为止，我已经相当远了，我想，我只是坚持这个目前非常奇怪的问题。

我已经构建了一个CXF网络服务，允许人们上传照片（将部署在Google Apps Engine中）。它应该工作正常，但是：我不知道如何测试它，因为它是多部分/相关的（合同也是如此）。无法通过PostMan，SOAPUI或任何其他UI测试程序对此进行测试，因此我直接从Java进行测试。

我从这篇文章开始：http://www.jguru.com/faq/view.jsp?EID=735674，并详细介绍了我的语法应该是这样的示例：

• http://www.stylusstudio.com/xmldev/199911/post60420.html
• http://msdn.microsoft.com/en-us/library/ms527355(v=exchg.10).aspx
• https://www.ietf.org/rfc/rfc2387.txt

哎呀，我甚至通过Apache CXF的源代码来查找崩溃的来源GC - AttachmentDeserializer。

这是想要发送的内容：

--the_photo
Content-Type: application/json

{
    "objectToLinkTo": "ad9821e6-d308-472b-b21f-308b08c3fa70"
}

--the_photo
Content-Type: image/jpeg

JPEG data

--the_photo--

这是我尝试发送此内容的方法：

import java.io.BufferedInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Paths;

public class PhotoTest {
    private static final String ADD_PHOTO = "http://localhost:8080/v1/photos";

    private static void writeJson(String value, DataOutputStream out, String boundary) {
        try {
            out.writeBytes("Content-Type: application/json");
            out.writeBytes("\n{'objectToLinkTo': '" + value + "'}");
            out.writeBytes("\n--" + boundary);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void writeImage(String contentType, String file, DataOutputStream out, String boundary) {
        try {
            out.writeBytes("Content-Type: " + contentType + "\n");
            java.nio.file.Path path = Paths.get(file);
            byte[] data = Files.readAllBytes(path);
            out.write(data);
            out.writeBytes("\n--" + boundary + "--");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public  static void main (String args[]) {
        try {
            URL servlet = new URL(ADD_PHOTO);
            URLConnection urlConnection = servlet.openConnection();
            urlConnection.setDoOutput(true);
            urlConnection.setDoInput(true);
            urlConnection.setUseCaches(false);
            String boundary = "the_photo";
            urlConnection.setRequestProperty("Content-type", "multipart/related; boundary=" + boundary);
            urlConnection.setRequestProperty("Cache-Control", "no-cache");

            DataOutputStream out = new DataOutputStream(urlConnection.getOutputStream());
            out.writeBytes("--" + boundary + "\n");
            writeJson("ad9821e6-d308-472b-b21f-308b08c3fa70", out, boundary);
            writeImage("image/jpeg", "K:\\Downloads\\test.jpg", out, boundary);
            out.flush();
            out.close();

            InputStream stream = urlConnection.getInputStream();
            BufferedInputStream in = new BufferedInputStream(stream);
            int i = 0;
            while ((i = in.read()) != -1) {
                System.out.write(i);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

服务器端的结果（使用mvn appengine:test在本地部署代码）：

[INFO] 07:27:06,804 ERROR [commons.exceptions.exceptionwrapper.RuntimeExceptionWrapper] - Couldn't find MIME boundary: --the_photo
[INFO] org.apache.cxf.interceptor.Fault: Couldn't find MIME boundary: --the_photo
[INFO]  at org.apache.cxf.interceptor.AttachmentInInterceptor.handleMessage(AttachmentInInterceptor.java:60)
[INFO]  at org.apache.cxf.jaxrs.ext.MessageContextImpl.createAttachments(MessageContextImpl.java:267)
[INFO]  at org.apache.cxf.jaxrs.ext.MessageContextImpl.get(MessageContextImpl.java:76)
[INFO]  at org.apache.cxf.jaxrs.impl.tl.ThreadLocalMessageContext.get(ThreadLocalMessageContext.java:38)
[INFO]  at org.apache.cxf.jaxrs.utils.multipart.AttachmentUtils.getMultipartBody(AttachmentUtils.java:114)
[INFO]  at org.apache.cxf.jaxrs.utils.multipart.AttachmentUtils.getAttachments(AttachmentUtils.java:119)
[INFO]  at org.apache.cxf.jaxrs.provider.MultipartProvider.readFrom(MultipartProvider.java:151)
[INFO]  at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBodyReader(JAXRSUtils.java:1325)
[INFO]  at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBody(JAXRSUtils.java:1276)
[INFO]  at org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameter(JAXRSUtils.java:815)
[INFO]  at org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameters(JAXRSUtils.java:778)
[INFO]  at org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:212)
[INFO]  at org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.handleMessage(JAXRSInInterceptor.java:77)
[INFO]  at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
[INFO]  at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
[INFO]  at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:243)
[INFO]  at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:223)
[INFO]  at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:197)
[INFO]  at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:149)
[INFO]  at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:171)
[INFO]  at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:286)
[INFO]  at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:206)
[INFO]  at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
[INFO]  at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:262)
[INFO]  at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
[INFO]  at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
[INFO]  at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
[INFO]  at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[INFO]  at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
[INFO]  at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
[INFO]  at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
[INFO]  at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
[INFO]  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
[INFO]  at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
[INFO]  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
[INFO]  at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
[INFO]  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
[INFO]  at org.mortbay.jetty.Server.handle(Server.java:326)
[INFO]  at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
[INFO]  at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
[INFO]  at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
[INFO]  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
[INFO]  at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
[INFO]  at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
[INFO]  at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
[INFO] Caused by: java.io.IOException: Couldn't find MIME boundary: --the_photo
[INFO]  at org.apache.cxf.attachment.AttachmentDeserializer.initializeRootMessage(AttachmentDeserializer.java:123)
[INFO]  at org.apache.cxf.attachment.AttachmentDeserializer.initializeAttachments(AttachmentDeserializer.java:92)
[INFO]  at org.apache.cxf.interceptor.AttachmentInInterceptor.handleMessage(AttachmentInInterceptor.java:58)
[INFO]  ... 58 more

所以，我很确定我在主函数中用来测试的代码甚至没有超过第一个out.writeBytes("--" + boundary + "\n");，因为错误表明服务器代码不能在任何地方找到边界。我认为是因为我走过的GrepCode代码 - 它是在AttachmentInInterceptor中的某个地方初始化消息，代码崩溃了;因此他甚至不会将任何实际写入的数据处理到流中。 （或者：服务器永远不会到达我自己的服务器代码，它会检查两个附件，等等。）

DataOutputStream out = new DataOutputStream(urlConnection.getOutputStream());
out.writeBytes("--" + boundary + "\n");
writeJson("ad9821e6-d308-472b-b21f-308b08c3fa70", out, boundary);
writeImage("image/jpeg", "K:\\Downloads\\test.jpg", out, boundary);
out.flush();
out.close();

这里的任何人都可以帮助我吗？我究竟做错了什么？可能这只是我在urlConnection上写错了的一个细节，导致导线的另一端无法找到边界。但是我一直在寻找这个问题并且找不到它。

---

编辑：所以，我做了一些改变：

我补充说：

private static final String CRLF = "\r\n";
private StringBuilder text = new StringBuilder();

改变了：

public void writeJson(String value) {
    String s = "--" + boundary + CRLF;
    s += "Content-Type: application/json" + CRLF + CRLF;
    s += "{\"objectToLinkTo\":\"" + value + "\"}" + CRLF + CRLF;
    text.append(s);
}

public void writeBinaryFile(String fileName, String mimeType, String encoding) throws Exception {
    String s = "--" + boundary + CRLF;
    s += "Content-Type: " + mimeType + CRLF;
    text.append(s);

    java.nio.file.Path path = Paths.get(fileName);
    byte[] data = Files.readAllBytes(path);
    text.append(new String(data, encoding)).append(CRLF);
}

public void finish() {
    text.append("--").append(boundary).append("--").append(CRLF);
}

private static void printResponse(URLConnection urlConnection) {
    try {
        InputStream is = urlConnection.getInputStream();
        while (is.available() != 0) {
            byte[] data = new byte[is.available()];
            is.read(data);
            System.out.println(new String (data, "UTF-8"));
        }
    } catch (Exception exc) {
        exc.printStackTrace();
    }
}

public static void main(String[] args) throws Exception {
    PhotoTest photoTest = new PhotoTest();
    photoTest.writeJson("ad9821e6-d308-472b-b21f-308b08c3fa70");
    //photoTest.writeBinaryFile("K:\\Downloads\\test.jpg", "image/jpeg", "UTF-8");
    photoTest.finish();
    System.out.println(photoTest.getText());

    URL url = new URL(MEDIA_ADD_PHOTO);
    URLConnection urlConnection = url.openConnection();
    urlConnection.setDoOutput(true);
    urlConnection.setUseCaches(false);
    ((HttpURLConnection) urlConnection).setRequestMethod("POST");
    urlConnection.setRequestProperty("Accept-Charset", "UTF-8");
    urlConnection.setRequestProperty("Content-Type", "multipart/related; boundary=" + photoTest.getBoundary());
    urlConnection.setRequestProperty("Content-Length", Integer.toString(photoTest.getLength()));
    OutputStream output = urlConnection.getOutputStream();
    output.write(photoTest.getContent().getBytes());
    output.flush();
    output.close();

    printResponse(urlConnection);
}

现在，我删除了图像部分（只是为了检查我是否可以通过拦截器到达我自己的服务器代码，这应该检查图像是否存在）。如你所见，我打印了为控制台构建的消息，它给了我这个：

--the_photo
Content-Type: application/json

{"objectToLinkTo":"ad9821e6-d308-472b-b21f-308b08c3fa70"}

--the_photo--

我仍然得到同样的错误。谁能解释一下我做错了什么？

Answer 1

好吧，正如我想的那样，它最终成了某个小错误。

我随机开始编辑内容 - 我实际上想尝试调试整个事情，但由于我从未到达我自己的服务器端代码并​​陷入Apache CXF层，我不能。然后我想，让我们简单地评论拦截器：

<jaxrs:server address="/v1/photos">
    <jaxrs:serviceBeans>
        <ref bean="resourceV1" />
    </jaxrs:serviceBeans>
    <!--<jaxrs:inInterceptors>-->
        <!--<bean class="org.apache.cxf.interceptor.AttachmentInInterceptor"/>-->
    <!--</jaxrs:inInterceptors>-->
    <jaxrs:features>
        <cxf:logging />
    </jaxrs:features>
    <jaxrs:providers>
        <bean class="commons.exceptions.exceptionwrapper.BusinessExceptionWrapper" />
        <bean class="commons.exceptions.exceptionwrapper.RuntimeExceptionWrapper" />
        <bean class="org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider" />
    </jaxrs:providers>
</jaxrs:server>

神奇地说：它现在有效。我不知道为什么我开始使用AttachmentInInterceptor。

感谢您的帮助。