上传文件时使用HttpUrlConnection时出错

Question

我有一个Android应用程序和我的魔杖从这个应用程序上传，大图像（在这种情况下32MB）到Spring Server，但我得到java.net.SocketException：sendto失败：EPIPE（断管）错误。

我用这个方法：

public static void setPicture(User user, Picture picture, HavePicture havePicture, File file) {
    try {
        URL url = new URL(Request.BASE_URL + Request.BASE_PATH + Request.GAME_SYSTEM_PATH + Request.SET_PICTURE_PATH);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setUseCaches(false);
        connection.setDoOutput(true); // indicates POST method
        connection.setDoInput(true);
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        connection.setRequestProperty("User-Agent", "CodeJava Agent");
        connection.setRequestProperty("Test", "Bonjour");

        //load file with multi small pices not one lage pice good to use large filse
        connection.setChunkedStreamingMode(1024);

        OutputStream outputStream = connection.getOutputStream();
        PrintWriter writer = new PrintWriter(new OutputStreamWriter(outputStream, Request.CHARSET), true);

        addFormField(writer, Request.PARAM_USER, Json.toJson(user));
        addFormField(writer, Request.PARAM_PICTURE, Json.toJson(picture));
        addFormField(writer, Request.PARAM_HAVE_PICTURE, Json.toJson(havePicture));
        addFilePart(writer, outputStream, Request.PARAM_FILE, file);

        StringBuffer response = new StringBuffer();

        writer.append(LINE_FEED).flush();
        writer.append("--" + boundary + "--").append(LINE_FEED);
        writer.close();
        // checks server's status code first
        int status = connection.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            connection.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }

        String a =  response.toString();
        System.out.println(a);

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

params： user ， picture和havePicture是我想用大图像发送json的一些对象，这种方法适用于小于1MB的小图像。

这里剩下的方法：

private static void addFormField(PrintWriter writer, String name, String value) {
    writer.append("--" + boundary).append(LINE_FEED);
    writer.append("Content-Disposition: form-data; name=\"" + name + "\"").append(LINE_FEED);
    writer.append("Content-Type: text/plain; charset=" + Request.CHARSET).append(LINE_FEED);
    writer.append(LINE_FEED);
    writer.append(value).append(LINE_FEED);
    writer.flush();
}

用于图像文件：

private static void addFilePart(PrintWriter writer,OutputStream outputStream, String fieldName, File uploadFile) throws IOException {
    String fileName = uploadFile.getName();
    writer.append("--" + boundary).append(LINE_FEED);
    writer.append("Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + fileName + "\"").append(LINE_FEED);
    writer.append("Content-Type: "+URLConnection.guessContentTypeFromName(fileName)).append(LINE_FEED);
    writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);

    FileInputStream inputStream = new FileInputStream(uploadFile);

    writer.append("Content-length: "+inputStream.available()).append(LINE_FEED);
    System.out.println("- - "+"Content-length: "+inputStream.available());
    writer.append(LINE_FEED);
    writer.flush();


    byte[] buffer = new byte[4096];
    int bytesRead = -1;
    while ((bytesRead = inputStream.read(buffer)) != -1) {
        outputStream.write(buffer, 0, bytesRead);
    }
    outputStream.flush();
    inputStream.close();

    writer.append(LINE_FEED);
    writer.flush();
}

这是我完成的错误：

java.net.SocketException：sendto failed：在java.net.PlainSocketImpl上的libcore.io.IoBridge.sendto（IoBridge.java：555）的libcore.io.IoBridge.maybeThrowAfterSendto（IoBridge.java:586）上的EPIPE（Broken pipe） .write（PlainSocketImpl.java:520）at java.net.PlainSocketImpl.access $ 100（PlainSocketImpl.java:43）at java.net.PlainSocketImpl $ PlainSocketOutputStream.write（PlainSocketImpl.java:272）at com.android.okio.Okio com.android.okhttp上com.android.okio.RealBufferedSink.write（RealBufferedSink.java:44）的com.android.okio.RealBufferedSink.emitCompleteSegments（RealBufferedSink.java:116）$ 1.write（Okio.java:70） .internal.http.HttpConnection $ ChunkedSink.write（HttpConnection.java:334）at com.android.okio.RealBufferedSink.emitCompleteSegments（RealBufferedSink.java:116）at com.android.okio.RealBufferedSink $ 1.write（RealBufferedSink.java: 131）com.mayan.ameritrade.android.tools.Server $ override.addFilePart（Server.java:435）at com.mayan.ameritrade.android.tools.Server $ override.access $ dispatch（Server.java） at com.mayan.ameritrade.android.tools.Server.addFilePart（Server.java:0）at java.lang.reflect.Method.invoke（Native Method）at java.lang.reflect.Method.invoke（Method.java： 372）在com.mayan.amenidrade.android.tools.Server $ override.setPicture（Server.java:363）com.mayan的com.android.tools.fd.runtime.AndroidInstantRuntime.invokeProtectedStaticMethod(AndroidInstantRuntime.java:170） .ameritrade.android.tools.Server $ override.access $ dispatch（Server.java）at com.mayan.ameritrade.android.tools.Server.setPicture（Server.java:0）at com.mayan.ameritrade.android.MainActivity java.lang.Thread.run上的$ 2 $ 1.run（MainActivity.java:99）（Thread.java:818）引起：android.system.ErrnoException：sendto failed：libcore.io.Posix中的EPIPE（Broken pipe）。发送到libcore.io.Posix.sendto（Posix.java:206）的libto.io.BlockGuardOs.sendto（BlockGuardOs.java:278）的libto.io.IoBridge.sendto（IoBridge.java:553）的sendtoBytes（Native Method） ......还有20个

我现在不做该做什么，谢谢你的帮助！

Answer 1

你无法使用PrintWriter上传图片......你不...但......

PrintWriter仅用于文本。

您正在混合PrintWriter和普通的OutputStream。 那行不通。

您应该只写一种类型的流。

Answer 2

我的问题解决了！ 感谢@Randyka Yudhistira和@greenapps的帮助，我的问题是客户端的一些不必要的代码，主要是我的Spring服务器无法上传大文件

解

添加inserver端：

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSizePerFile">yourMaxSizeToUpload</property>
</bean>

要么

@Bean
public CommonsMultipartResolver getCommonsMultipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setMaxUploadSize(yourMaxSizeToUpload);
    return resolver;
}

如果这不起作用尝试删除不必要的代码，如：

writer.append("Content-length: "+inputStream.available()).append(LINE_FEED);

在我的情况下。