Apache HttpClient 制作多部分表单帖子

Question

我对 HttpClient 很陌生，我发现缺少（和或明显不正确的）文档非常令人沮丧。我正在尝试使用 Apache Http Client 实现以下帖子（如下所列），但不知道如何实际操作。下周我将埋头于文档中，但也许更有经验的 HttpClient 编码人员可以更快地给我答案。

帖子：

Content-Type: multipart/form-data; boundary=---------------------------1294919323195
Content-Length: 502
-----------------------------1294919323195
Content-Disposition: form-data; name="number"

5555555555
-----------------------------1294919323195
Content-Disposition: form-data; name="clip"

rickroll
-----------------------------1294919323195
Content-Disposition: form-data; name="upload_file"; filename=""
Content-Type: application/octet-stream


-----------------------------1294919323195
Content-Disposition: form-data; name="tos"

agree
-----------------------------1294919323195--

Answer 1

使用来自HttpMime library 的 MultipartEntityBuilder 来执行您想要的请求。

在我的项目中，我是这样做的：

HttpEntity entity = MultipartEntityBuilder
    .create()
    .addTextBody("number", "5555555555")
    .addTextBody("clip", "rickroll")
    .addBinaryBody("upload_file", new File(filePath), ContentType.APPLICATION_OCTET_STREAM, "filename")
    .addTextBody("tos", "agree")
    .build();

HttpPost httpPost = new HttpPost("http://some-web-site");
httpPost.setEntity(entity);
HttpResponse response = httpClient.execute(httpPost);
HttpEntity result = response.getEntity();

希望这会有所帮助。

（以@mtomy 代码为例，更新了这篇文章以使用 MultipartEntityBuilder 而不是已弃用的 MultipartEntity）

Answer 2

MultipartEntity 现在显示为已弃用。我正在使用阿帕奇 httpclient 4.3.3 - 有谁知道我们应该使用什么 反而？我发现谷歌搜索充满了 MultipartEntity 示例我找不到任何东西。 – vextorspace 2014 年 3 月 31 日 20:36

这里是 HttpClient 4.3.x 中的示例代码

http://hc.apache.org/httpcomponents-client-4.3.x/httpmime/examples/org/apache/http/examples/entity/mime/ClientMultipartFormPost.java

import org.apache.http.entity.mime.MultipartEntityBuilder;

HttpPost httppost = new HttpPost("http://localhost:8080" +
        "/servlets-examples/servlet/RequestInfoExample");

FileBody bin = new FileBody(new File(args[0]));
StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);

HttpEntity reqEntity = MultipartEntityBuilder.create()
        .addPart("bin", bin)
        .addPart("comment", comment)
        .build();


httppost.setEntity(reqEntity);

要使用MultipartEntityBuilder类，需要httpmime，它是HttpClient的子项目

HttpClient 4.3.x：

http://hc.apache.org/httpcomponents-client-4.3.x/index.html

httpmime 4.3.x：

http://hc.apache.org/httpcomponents-client-4.3.x/httpmime/dependency-info.html

Answer 3

如果使用 org.apache.commons.httpclient.HttpClient 包，也许对你有帮助！

    HttpConnectionManager httpConnectionManager = new MultiThreadedHttpConnectionManager();
    //here should set HttpConnectionManagerParams but not important for you
    HttpClient httpClient = new HttpClient(httpConnectionManager);

    PostMethod postMethod = new PostMethod("http://localhost/media");

    FilePart filePart = new FilePart("file", new File(filepath));
    StringPart typePart = new StringPart("type", fileContent.getType(), "utf-8");
    StringPart fileNamePart = new StringPart("fileName", fileContent.getFileName(), "utf-8");
    StringPart timestampPart = new StringPart("timestamp", ""+fileContent.getTimestamp(),"utf-8");
    Part[] parts = { typePart, fileNamePart, timestampPart, filePart };

    MultipartRequestEntity multipartRequestEntity = new MultipartRequestEntity(parts, postMethod.getParams());
    postMethod.setRequestEntity(multipartRequestEntity);
    httpClient.executeMethod(postMethod);
    String responseStr = postMethod.getResponseBodyAsString();