通过HTTP POST上传文件 [英] Upload file by HTTP POST
本文介绍了通过HTTP POST上传文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想使用 HTTP POST 将文件（特定于图像）上传到REST服务器。我已导入/添加到构建路径 httpmime-4.3.1.jar 和 apache-mime4j-0.6.jar 。我在堆栈跟踪中得到以下错误。
I want to upload a file (an image specifically) to a REST Server using HTTP POST. I have already imported/add to build path httpmime-4.3.1.jar and apache-mime4j-0.6.jar. And I am getting the follow errors below in the Stack Trace.
这是否有效？ 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);
}
堆栈追踪
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
推荐答案
您似乎错过了依赖。
我有 httpclient-4.2.5 ， httpcleint-cache-4.2.5 ， httpcore-4.2.4 和 httpmime-4.2.5 带 commons-lang3-3.1 和 commons-logging-1.1.2 我的类路径中的jar。
I have httpclient-4.2.5, httpcleint-cache-4.2.5, httpcore-4.2.4 and httpmime-4.2.5 with commons-lang3-3.1 and commons-logging-1.1.2 jars in my class path.
我也使用 entity.addPart（formFieldName，new FileBody（file，image / jpeg））; 而不是使用header属性。
I also use entity.addPart(formFieldName, new FileBody(file, "image/jpeg")); instead of using the header property.
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