GroovyのHttpBuilderでファイルアップロード

HttpClient経由だと日本語ファイル名が化けてしまうのはまだ未解決。

@Grab('org.codehaus.groovy.modules.http-builder:http-builder:0.7')
import groovyx.net.http.HTTPBuilder
import groovyx.net.http.ContentType
import static groovyx.net.http.ContentType.TEXT
import static groovyx.net.http.Method.POST

@Grab('org.apache.httpcomponents:httpmime:4.3.2')
import org.apache.http.entity.mime.MultipartEntityBuilder
import org.apache.http.util.EntityUtils
import static org.apache.http.entity.ContentType.TEXT_PLAIN

def URL_ROOT = 'http://...'
def http = new HTTPBuilder(URL_ROOT)

http.request( POST, TEXT ) { req ->
    uri.path = '/path/to/upload'
    req.entity = MultipartEntityBuilder
        .create()
        .setCharset(Charset.forName('UTF-8')) // Java7 以降なら StandardCharsets.UTF_8
        .addTextBody('hoge', 'ほげほげ', TEXT_PLAIN.withCharset('UTF-8'))
        .addBinaryBody('importFile', file) // java.io.File
        .build()

    response.success = { res, reader ->
        def responseBytes = EntityUtils.toByteArray(res.getEntity())
        def bis = new ByteArrayInputStream(responseBytes)
        // ... 用途に合わせてレスポンス処理
    }

    response.failure = { res, reader ->
        // 失敗時
    }
}