如何使用Java发出多部分/表单数据POST请求？
在Apache Commons HttpClient版本3.x的时代，可以发出多部分/表单数据POST请求(an example from 2004)。不幸的是，这在version 4.0 of HttpClient中不再是可能的。
对于我们的核心活动“
”，multipart有点超出了范围。我们很乐意使用由其他项目维护的多部分代码，但我不知道有没有。几年前，我们试图将多部分代码转移到commons-codec，但我并没有从那里开始。奥列格最近提到了另一个项目，它有多部分解析代码，可能会对我们的多部分格式化代码感兴趣。我不知道它现在的状态。(http://www.nabble.com/multipart-form-data-in-4.0-td14224819.html)
有没有人知道有什么Java库可以让我编写一个可以发出多部分/表单数据POST请求的HTTP客户端？
背景:我想使用Remote API of Zoho Writer。
回答 13
Stack Overflow用户
发布于 2009-09-04 12:43:05
我们使用HttpClient 4.x来制作多部分文件post。
更新：从HttpClient 4.3开始，一些类已经被弃用。下面是新API的代码：
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost uploadFile = new HttpPost("...");
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addTextBody("field1", "yes", ContentType.TEXT_PLAIN);
// This attaches the file to the POST:
File f = new File("[/path/to/upload]");
builder.addBinaryBody(
"file",
new FileInputStream(f),
ContentType.APPLICATION_OCTET_STREAM,
f.getName()
);
HttpEntity multipart = builder.build();
uploadFile.setEntity(multipart);
CloseableHttpResponse response = httpClient.execute(uploadFile);
HttpEntity responseEntity = response.getEntity();以下是使用弃用的HttpClient 4.0 API的原始代码片段
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
FileBody bin = new FileBody(new File(fileName));
StringBody comment = new StringBody("Filename: " + fileName);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("bin", bin);
reqEntity.addPart("comment", comment);
httppost.setEntity(reqEntity);
HttpResponse response = httpclient.execute(httppost);
HttpEntity resEntity = response.getEntity();Stack Overflow用户
发布于 2010-06-09 14:00:46
这些是我拥有的Maven依赖项。
Java代码：
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
FileBody uploadFilePart = new FileBody(uploadFile);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("upload-file", uploadFilePart);
httpPost.setEntity(reqEntity);
HttpResponse response = httpclient.execute(httpPost);Pom.xml中的Maven依赖项：
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.0.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.0.1</version>
<scope>compile</scope>
</dependency>Stack Overflow用户
发布于 2013-04-27 00:36:05
如果JAR的大小很重要(例如，在applet的情况下)，也可以直接将httpmime与java.net.HttpURLConnection一起使用，而不是HttpClient。
httpclient-4.2.4: 423KB
httpmime-4.2.4: 26KB
httpcore-4.2.4: 222KB
commons-codec-1.6: 228KB
commons-logging-1.1.1: 60KB
Sum: 959KB
httpmime-4.2.4: 26KB
httpcore-4.2.4: 222KB
Sum: 248KB代码：
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
FileBody fileBody = new FileBody(new File(fileName));
MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.STRICT);
multipartEntity.addPart("file", fileBody);
connection.setRequestProperty("Content-Type", multipartEntity.getContentType().getValue());
OutputStream out = connection.getOutputStream();
try {
multipartEntity.writeTo(out);
} finally {
out.close();
}
int status = connection.getResponseCode();
...Pom.xml中的依赖项：
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.2.4</version>
</dependency>https://stackoverflow.com/questions/1378920
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