我的实现如下.
@H_502_6@public class MultipartUploader { private static final String CHARSET = "UTF-8"; private static final String CRLF = "\r\n"; public String httpUpload(String url,String filename,byte[] byteStream) throws MalformedURLException,IOException { HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection(); final String boundary = Strings.repeat("-",15) + Long.toHexString(System.currentTimeMillis()); connection.setDoOutput(true); connection.setDoInput(true); connection.setUseCaches(false); connection.setRequestMethod("POST"); connection.setRequestProperty("Connection","Keep-Alive"); connection.setRequestProperty("Cache-Control","no-cache"); connection.setRequestProperty("Content-Type","multipart/form-data; boundary=" + boundary); OutputStream directOutput = connection.getOutputStream(); PrintWriter body = new PrintWriter(new OutputStreamWriter(directOutput,CHARSET),true); body.append(CRLF); addSimpleFormData("myuser","myUserName",body,boundary); addSimpleFormData("mypassword","mySecretPassword",boundary); addFileData("myfile",filename,byteStream,directOutput,boundary); addCloseDelimiter(body,boundary); int responseCode = connection.getResponseCode(); String responseMessage = connection.getResponseMessage(); String payload = CharStreams.toString(new InputStreamReader(connection.getInputStream())); return payload; } private static void addSimpleFormData(String paramName,String wert,PrintWriter body,final String boundary) { body.append(boundary).append(CRLF); body.append("Content-Disposition: form-data; name=\"" + paramName + "\"").append(CRLF); body.append("Content-Type: text/plain; charset=" + CHARSET).append(CRLF); body.append(CRLF); body.append(wert).append(CRLF); body.flush(); } private static void addFileData(String paramName,byte[] byteStream,OutputStream directOutput,final String boundary) throws IOException { body.append(boundary).append(CRLF); body.append("Content-Disposition: form-data; name=\"" + paramName + "\"; filename=\"" + filename + "\"") .append(CRLF); body.append("Content-Type: application/octed-stream").append(CRLF); body.append("Content-Transfer-Encoding: binary").append(CRLF); body.append(CRLF); body.flush(); directOutput.write(byteStream); directOutput.flush(); body.append(CRLF); body.flush(); } private static void addCloseDelimiter(PrintWriter body,final String boundary) { body.append(boundary).append("--").append(CRLF); body.flush(); } }
服务器响应200 OK.我遇到的问题是,不正确地创建了HTTP正文,以便我从服务器获得的响应表明并非所有表单字段都已设置.服务器没有说明它是哪个字段.
所以我的问题是你看到这个代码有什么问题吗?我是否正确创建了多部分请求?
@H_502_6@cURL -F "myuser=myUserName" -F "mypassword=mySecretPassword" -F "myfile=@/path/to/my/file.zip" "http://abcdef.gh:1234/path/to/uploader"
我通过捕获通过程序制作的http://httpbin.org/post请求并卷曲并通过diff工具进行比较来找到这个.我使用Wireshark来捕获请求.
@H_502_6@private static void addSimpleFormData(String paramName,final String boundary) { body.append("--").append(boundary).append(CRLF); body.append("Content-Disposition: form-data; name=\"" + paramName + "\"").append(CRLF); body.append("Content-Type: text/plain; charset=" + CHARSET).append(CRLF); body.append(CRLF); body.append(wert).append(CRLF); body.flush(); } private static void addFileData(String paramName,final String boundary) throws IOException { body.append("--").append(boundary).append(CRLF); body.append("Content-Disposition: form-data; name=\"" + paramName + "\"; filename=\"" + filename + "\"") .append(CRLF); body.append("Content-Type: application/octed-stream").append(CRLF); body.append("Content-Transfer-Encoding: binary").append(CRLF); body.append(CRLF); body.flush(); directOutput.write(byteStream); directOutput.flush(); body.append(CRLF); body.flush(); } private static void addCloseDelimiter(PrintWriter body,final String boundary) { body.append("--").append(boundary).append("--").append(CRLF); body.flush(); }
注意每个方法开头的额外.append(“ – ”).
有关完整的工作代码,请参阅https://gist.github.com/shtratos/8e9570a4a5591b2bcecd55ca60b3f24f