Java 如何在 HttpURLConnection 上设置实体
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How to setEntity on a HttpURLConnection
提问by Knows Not Much
In my project I must strictly use HttpURLConnection class
在我的项目中，我必须严格使用 HttpURLConnection 类
I have this following code which I got from the internet
我有以下从互联网上获得的代码
MultipartEntity multiPart = new MultiPartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, null Chartset.forName("UTF-8");
File f = new File("/home/abhishek/foo.docx");
FileBody fb = new FileBody(f);
multiPart.addPart("file", fb);
HttpPost post = new HttpPost();
post.setHeader("ENCTYPE", "multipart/form-data");
post.setEntity(multiPart);
Problem is that I cannot use HttpPost ... In my project only HttpURLConnection class works!
问题是我不能使用 HttpPost ......在我的项目中只有 HttpURLConnection 类有效！
So I need to translate the code above into HttpURLConnection.
所以我需要把上面的代码翻译成HttpURLConnection。
I cannot find anything similar to setEntity on the HttpUrlConnection.
我在 HttpUrlConnection 上找不到任何类似于 setEntity 的东西。
Edit::
编辑：：
Based on the suggestions below. I have this code
基于以下建议。我有这个代码
public class RESTFileUpload {
public static void main(String[] args) throws Exception {
Authenticator.setDefault(new Authenticator() {
@Override
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("domain\user", "Password".toCharArray());
}
});
String filePath = "/home/abhishek/Documents/HelloWorld.docx";
String fileName = "HelloWorld.docx";
String fileNameShort = "HelloWorld";
String urlStr = "https://sp.company.com/sites/abhi_test/_vti_bin/listdata.svc/SharedDocuments/RootFolder/Files/add(url=@TargetFileName,overwrite='true')&@TargetFileName=" + fileName;
String crlf = "\r\n";
String twoHypens = "--";
String boundary = "*****";
URL url = new URL(urlStr);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setDoInput(true);
con.setUseCaches(false);
con.setRequestMethod("POST");
con.setRequestProperty("Connection", "Keep-Alive");
con.setRequestProperty("Cache-Control", "no-cache");
con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
DataOutputStream request = new DataOutputStream(con.getOutputStream());
request.writeBytes(twoHypens + boundary + crlf);
request.writeBytes("Content-Disposition: form-data;name=\"" + fileNameShort + "\";fileName=\"" + fileName + "\"" + crlf);
request.writeBytes(crlf);
request.write(convertToByteArray(filePath));
request.writeBytes(crlf);
request.writeBytes(twoHypens + boundary + twoHypens + crlf);
request.flush();
request.close();
InputStream responseStream = new BufferedInputStream(con.getInputStream());
BufferedReader responseStreamReader = new BufferedReader(new InputStreamReader(responseStream));
String line = "";
StringBuilder strBuilder = new StringBuilder();
while((line = responseStreamReader.readLine()) != null) {
strBuilder.append(line).append("\n");
}
responseStreamReader.close();
String response = strBuilder.toString();
responseStream.close();
con.disconnect();
System.out.println(response);
}
private static byte[] convertToByteArray(String filePath) {
File f = new File(filePath);
byte[] retVal = new byte[(int)f.length()];
try {
FileInputStream fis = new FileInputStream(f);
fis.read(retVal);
}
catch (FileNotFoundException ex) {
ex.printStackTrace();
}
catch(IOException ex2) {
ex2.printStackTrace();
}
return retVal;
}
}
But I get the error
但我得到了错误
Exception in thread "main" java.io.IOException: Server returned HTTP response code: 400 for URL: https://sp.web.gs.com/sites/abhi_test/_vti_bin/listdata.svc/SharedDocuments/
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1626)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
at RESTFileUpload.main(RESTFileUpload.java:62)
采纳答案by Naili
回答by djmorton
HttpURLConnection has .getInputStream() and .getOutputStream() methods. If you wish to send body content with an Http request, you call .setDoOutput(true) on your HttpURLConnection object, call .getOutputStream() to get an Output stream and then write the content of your entity to the output stream (either as raw bytes, or using a Writer implementation of some sort), closing it when you are finished writing.
HttpURLConnection 有 .getInputStream() 和 .getOutputStream() 方法。如果您希望使用 Http 请求发送正文内容，请在 HttpURLConnection 对象上调用 .setDoOutput(true)，调用 .getOutputStream() 以获取输出流，然后将实体的内容写入输出流（作为原始字节，或使用某种 Writer 实现），写完后关闭它。
For more details, see the API docs for HttpURLConnection here.
有关更多详细信息，请参阅此处HttpURLConnection 的 API 文档。
