通过 HTTP POST 上传文件

【问题标题】：Upload file by HTTP POST通过 HTTP POST 上传文件
【发布时间】：2014-01-06 01:48:18
【问题描述】：

我想使用HTTP POST 将文件（特别是图像）上传到 REST 服务器。我已经导入/添加到构建路径httpmime-4.3.1.jar 和apache-mime4j-0.6.jar。我在堆栈跟踪中收到以下错误。

这有效吗？ post.setHeader("enctype", "multipart/form-data");

HTTP POST 代码

public void multiPartPost() throws ClientProtocolException, IOException {
    File image = new File(EXTERNALSTORAGE + "/Pictures/sample.jpg");
    FileBody fileBody = new FileBody(image);

    HttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost(url);
    post.setHeader("enctype", "multipart/form-data");

    MultipartEntityBuilder multipartEntity = MultipartEntityBuilder.create();
    multipartEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
    multipartEntity.addPart("sampleImage", fileBody);
    post.setEntity(multipartEntity.build());

    HttpResponse response = client.execute(post);
    String responseBody = EntityUtils.toString(response.getEntity());
    Log.v("multiPartPost HTTP Response", responseBody);
}

堆栈跟踪

01-05 17:41:25.470: W/dalvikvm(6564): VFY: unable to resolve static field 1755 (DEFAULT_BINARY) in Lorg/apache/http/entity/ContentType;
01-05 17:41:25.470: D/dalvikvm(6564): VFY: replacing opcode 0x62 at 0x0000
01-05 17:41:25.470: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.create, referenced from method org.apache.http.entity.mime.content.FileBody.<init>
01-05 17:41:25.470: W/dalvikvm(6564): VFY: unable to resolve static method 6613: Lorg/apache/http/entity/ContentType;.create (Ljava/lang/String;)Lorg/apache/http/entity/ContentType;
01-05 17:41:25.470: D/dalvikvm(6564): VFY: replacing opcode 0x71 at 0x0000
01-05 17:41:25.470: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.create, referenced from method org.apache.http.entity.mime.content.FileBody.<init>
01-05 17:41:25.470: W/dalvikvm(6564): VFY: unable to resolve static method 6614: Lorg/apache/http/entity/ContentType;.create (Ljava/lang/String;Ljava/lang/String;)Lorg/apache/http/entity/ContentType;
01-05 17:41:25.470: D/dalvikvm(6564): VFY: replacing opcode 0x71 at 0x0000
01-05 17:41:25.470: W/dalvikvm(6564): VFY: unable to find class referenced in signature (Lorg/apache/http/entity/ContentType;)
01-05 17:41:25.470: W/dalvikvm(6564): VFY: unable to find class referenced in signature (Lorg/apache/http/entity/ContentType;)
01-05 17:41:25.478: W/dalvikvm(6564): VFY: unable to find class referenced in signature (Lorg/apache/http/entity/ContentType;)
01-05 17:41:25.478: W/dalvikvm(6564): VFY: unable to find class referenced in signature (Lorg/apache/http/entity/ContentType;)
01-05 17:41:25.478: I/dalvikvm(6564): Could not find method org.apache.http.util.Args.notNull, referenced from method org.apache.http.entity.mime.content.FileBody.<init>
01-05 17:41:25.478: W/dalvikvm(6564): VFY: unable to resolve static method 6808: Lorg/apache/http/util/Args;.notNull (Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
01-05 17:41:25.478: D/dalvikvm(6564): VFY: replacing opcode 0x71 at 0x0005
01-05 17:41:25.478: I/dalvikvm(6564): Could not find method org.apache.http.util.Args.notNull, referenced from method org.apache.http.entity.mime.content.FileBody.writeTo
01-05 17:41:25.478: W/dalvikvm(6564): VFY: unable to resolve static method 6808: Lorg/apache/http/util/Args;.notNull (Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
01-05 17:41:25.478: D/dalvikvm(6564): VFY: replacing opcode 0x71 at 0x0002
01-05 17:41:25.478: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.parse, referenced from method org.apache.http.entity.mime.content.AbstractContentBody.<init>
01-05 17:41:25.478: W/dalvikvm(6564): VFY: unable to resolve static method 6618: Lorg/apache/http/entity/ContentType;.parse (Ljava/lang/String;)Lorg/apache/http/entity/ContentType;
01-05 17:41:25.486: D/dalvikvm(6564): VFY: replacing opcode 0x71 at 0x0000
01-05 17:41:25.486: W/dalvikvm(6564): VFY: unable to find class referenced in signature (Lorg/apache/http/entity/ContentType;)
01-05 17:41:25.486: I/dalvikvm(6564): Could not find method org.apache.http.util.Args.notNull, referenced from method org.apache.http.entity.mime.content.AbstractContentBody.<init>
01-05 17:41:25.486: W/dalvikvm(6564): VFY: unable to resolve static method 6808: Lorg/apache/http/util/Args;.notNull (Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
01-05 17:41:25.486: D/dalvikvm(6564): VFY: replacing opcode 0x71 at 0x0005
01-05 17:41:25.486: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.getCharset, referenced from method org.apache.http.entity.mime.content.AbstractContentBody.getCharset
01-05 17:41:25.486: W/dalvikvm(6564): VFY: unable to resolve virtual method 6616: Lorg/apache/http/entity/ContentType;.getCharset ()Ljava/nio/charset/Charset;
01-05 17:41:25.486: D/dalvikvm(6564): VFY: replacing opcode 0x6e at 0x0002
01-05 17:41:25.486: W/dalvikvm(6564): VFY: unable to find class referenced in signature (Lorg/apache/http/entity/ContentType;)
01-05 17:41:25.486: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.getMimeType, referenced from method org.apache.http.entity.mime.content.AbstractContentBody.getMediaType
01-05 17:41:25.486: W/dalvikvm(6564): VFY: unable to resolve virtual method 6617: Lorg/apache/http/entity/ContentType;.getMimeType ()Ljava/lang/String;
01-05 17:41:25.486: D/dalvikvm(6564): VFY: replacing opcode 0x6e at 0x0002
01-05 17:41:25.493: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.getMimeType, referenced from method org.apache.http.entity.mime.content.AbstractContentBody.getMimeType
01-05 17:41:25.493: W/dalvikvm(6564): VFY: unable to resolve virtual method 6617: Lorg/apache/http/entity/ContentType;.getMimeType ()Ljava/lang/String;
01-05 17:41:25.493: D/dalvikvm(6564): VFY: replacing opcode 0x6e at 0x0002
01-05 17:41:25.493: I/dalvikvm(6564): Could not find method org.apache.http.entity.ContentType.getMimeType, referenced from method org.apache.http.entity.mime.content.AbstractContentBody.getSubType
01-05 17:41:25.493: W/dalvikvm(6564): VFY: unable to resolve virtual method 6617: Lorg/apache/http/entity/ContentType;.getMimeType ()Ljava/lang/String;
01-05 17:41:25.493: D/dalvikvm(6564): VFY: replacing opcode 0x6e at 0x0002
01-05 17:41:25.493: W/dalvikvm(6564): threadid=11: thread exiting with uncaught exception (group=0x40dc51f8)
01-05 17:41:25.501: E/AndroidRuntime(6564): FATAL EXCEPTION: AsyncTask #1
01-05 17:41:25.501: E/AndroidRuntime(6564): java.lang.RuntimeException: An error occured while executing doInBackground()
01-05 17:41:25.501: E/AndroidRuntime(6564):     at android.os.AsyncTask$3.done(AsyncTask.java:287)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:217)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.lang.Thread.run(Thread.java:856)
01-05 17:41:25.501: E/AndroidRuntime(6564): Caused by: java.lang.NoClassDefFoundError: org.apache.http.entity.ContentType
01-05 17:41:25.501: E/AndroidRuntime(6564):     at org.apache.http.entity.mime.content.FileBody.<init>(FileBody.java:89)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at com.medusa.checkit.HTTPPostRequest.multiPartPost(HTTPPostRequest.java:79)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at com.medusa.checkit.MenuActivity$BackgroundTask.doInBackground(MenuActivity.java:79)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at com.medusa.checkit.MenuActivity$BackgroundTask.doInBackground(MenuActivity.java:1)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at android.os.AsyncTask$2.call(AsyncTask.java:273)
01-05 17:41:25.501: E/AndroidRuntime(6564):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-05 17:41:25.501: E/AndroidRuntime(6564):     ... 5 more

【问题讨论】：

    标签： java rest http-post multipartentity


    【解决方案1】：

    您似乎缺少一个依赖项。

    我的课程路径中有httpclient-4.2.5、httpcleint-cache-4.2.5、httpcore-4.2.4 和httpmime-4.2.5 以及commons-lang3-3.1 和commons-logging-1.1.2 jar。

    我也使用entity.addPart(formFieldName, new FileBody(file, "image/jpeg"));，而不是使用 header 属性。

    查看Internet media type了解更多详情

    【讨论】：

    • 这是一个不错的改变 ;)
    • 另外，我使用setHeader的原因是因为上传到REST服务器时，它不会把它放在FILES文件夹中。显然设置enctype=multipart/form-data 就是这样做的。我可以使用enctype=multipart/form-data 作为FileBody 的第二个参数吗？
    • 不知道，试试看。请注意，如果它已经在工作，那么您可能需要它。这是我在您的代码和我的代码之间可以看到的唯一（显着）差异；）
    • 刚刚测试了标题属性的方法，特别是对于REST 服务器，您需要setHeader 才能使文件最终位于正确的文件夹中。
    • 请不要编辑答案，这会破坏他在问题和更新之间不断地交流，相反，留下突出显示 API 更改的 cmets，说明发生更改的版本，因为不是每个人都会使用相同的版本...
    猜你喜欢
    • 2010-11-01
    • 1970-01-01
    • 2011-10-18
    • 1970-01-01
    • 1970-01-01
    • 1970-01-01
    • 2011-07-15
    • 1970-01-01
    • 2013-11-29
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode