如何使用Apache HttpComponentst创建和发布多部分/混合http请求？

问题描述

我使用Apache HttpComponents v4.3.3（maven httpclient和httpmime）。我需要上传一个包含一些元数据的文件。 curl命令的工作原理如下：

I am using Apache HttpComponents v4.3.3 (maven httpclient and httpmime). I need to upload a file with some metadata. The curl command, which works, looks like the following.

curl post如下。

I have tried mimicking this curl post as the following.

HttpEntity entity = MultiPartEntityBuilder
 .create()
 .addPart("field1",new StringBody("val1",ContentType.TEXT_PLAIN))
 .addPart("field2",new StringBody("val2",ContentType.TEXT_PLAIN))
 .addPart("file", new FileBody(new File("somefile.zip"), ContentType.create("application/zip"))
 .build();
HttpPost post = new HttpPost("https://www.some.domain");
post.addHeader("Content-Type", "multipart/mixed");

但是，在我使用HttpClient执行HttpPost之后，我得到以下异常（服务器代码也是在Jetty上运行的Java）。

However, after I use HttpClient to execute the HttpPost, I get the following exception (server code is also Java running on Jetty).

一个跟踪到卷曲

我看到表单字段/值对被设置为HTTP头。

I see that the form field/value pairs are set as HTTP headers.

关于我在这里做错了什么想法？任何帮助是赞赏。

Any idea on what I'm doing wrong here? Any help is appreciated.

推荐答案

我修改了一点，做了两件事情让代码工作。

I tinkered a bit and did two things to get the code working.

• 不再使用addPart（...）


• 不再设置Content-Type标题

以下是修改后的代码段，以便任何人感兴趣。

Here's the revised snippet that's working in case anyone is interested.

HttpEntity entity = MultipartEntityBuilder
 .create()
 .addTextBody("field1","val1")
 .addTextBody("field2","val2")
 .addBinaryBody("file", new File("somefile.zip"),ContentType.create("application/zip"),"somefile.zip")
 .build();
HttpPost post = new HttpPost("https://www.some.domain");
post.setEntity(entity);

我还将HttpComponents设置为调试模式。

I also set HttpComponents to debug mode.

-Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.SimpleLog
-Dorg.apache.commons.logging.simplelog.showdatetime=true
-Dorg.apache.commons.logging.simplelog.log.org.apache.http=DEBUG

事实证明，每个零件现在有边界。更好的是，Content-Type和边界是自动生成的。

It turns out that each part now has a boundary. Even better yet, the Content-Type and boundary are autogenerated.

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