java post请求 error400(google docs应用)

Question

ByteArrayOutputStream buffer = null;
HttpURLConnection _httpURLConnection = null;
URL _url = null;

String resourceURL = "https://docs.google.com/feeds/default/private/full/folder%3Aroot/contents";
// 下面三个是三个不同的url
// https://docs.google.com/feeds/default/private/full/folder%3Aroot/contents
// https://docs.google.com/feeds/default/private/full 
// https://docs.google.com/feeds/default/private/full/folder%3A0B10bslXoeyplZGRiNzAyNWUtYmNjNy00YTczLTlmNGQtMjA4MTVmYTBlN2E4/contents// postData是请求体 下面两种写法哪一个对呢？还是都行？
//String postData = "<?xml version='1.0' encoding='UTF-8'?>\r\n" 
//   + "<entry xmlns=\"http://www.w3.org/2005/Atom\">\r\n"
//   + "<category scheme=\"http://schemas.google.com/g/2005#kind\"term=\"http://schemas.google.com/docs/2007#folder\"/>\r\n"
// + "<title>lpf66fpl</title>\r\n"
// + "</entry>\r\n";String postData = "<?xml version='1.0' encoding='UTF-8'?><entry xmlns=\"http://www.w3.org/2005/Atom\"><category scheme=\"http://schemas.google.com/g/2005#kind\"term=\"http://schemas.google.com/docs/2007#folder\"/><title>lpf66fpl</title></entry>";

int lenBody = postData.length();
System.out.println(lenBody);

_url = new URL(resourceURL);
_httpURLConnection = (HttpURLConnection)_url.openConnection();
//设置连接属性
_httpURLConnection.setDoOutput(true); //使用 URL 连接进行输出
_httpURLConnection.setDoInput(true); //使用 URL 连接进行输入
_httpURLConnection.setUseCaches(false); //忽略缓存
            
System.out.println(postData);
System.out.println(auth);
auth = "GoogleLogin auth=" + auth; // GoogleLogin 
System.out.println(auth);

_httpURLConnection.setRequestMethod("POST");   
_httpURLConnection.setRequestProperty("Host", "docs.google.com");
_httpURLConnection.setRequestProperty("GData-Version", "3.0");
_httpURLConnection.setRequestProperty("Authorization", auth);
_httpURLConnection.setRequestProperty("Content-Length", "" + Integer.toString(lenBody));
_httpURLConnection.setRequestProperty("Content-Type", "application/atom+xml");
_httpURLConnection.setRequestProperty("Expect", "100-continue");
        
//          OutputStreamWriter output = null;
//         output = new OutputStreamWriter(_httpURLConnection.getOutputStream(), "utf-8"); 
//         int contentlen = postData.toCharArray().length; // .length();          
//         output.write(postData.toCharArray(), 0, contentlen);
        
OutputStream output = _httpURLConnection.getOutputStream();
output.write(postData.getBytes());
//output.write(postData.getBytes(), 0, lenBody);
output.flush();
output.close();
        
_httpURLConnection.connect();
System.out.println(_httpURLConnection.getResponseCode());

byte[] buff = new byte[1024];
int len = -1;

buffer = new ByteArrayOutputStream();
InputStream in = _httpURLConnection.getInputStream();
while((len = in.read(buff))!= -1) 
{
buffer.write(buff, 0, len);
}
//buffer
String b = buffer.toString();
System.out.println(buffer.toString()); 大家看一下这个程序有没有大的错误？就是哪里写得不对下面是原文
Creating a folder
To create a folder, send an HTTP POST request with an <atom:entry> containing a category element with http://schemas.google.com/g/2005#kind scheme and http://schemas.google.com/docs/2007#folder term. The folder name will be determined by the value of the atom:title element if present. If no atom:title element is submitted, a default name will be chosen.Here is an example of creating a folder which will be called Example Folder on Google Documents.POST /feeds/default/private/full HTTP/1.1
Host: docs.google.com
GData-Version: 3.0
Authorization: <your authorization header here>
Content-Length: 245
Content-Type: application/atom+xml<?xml version='1.0' encoding='UTF-8'?>
<entry xmlns="http://www.w3.org/2005/Atom">
  <category scheme="http://schemas.google.com/g/2005#kind"
      term="http://schemas.google.com/docs/2007#folder"/>
  <title>Example Folder</title>
</entry>If the request is successful, a 201 Created response will be returned along with a <atom:entry> describing the folder on the server.Creating a subfolder
我得到
400
java.io.IOException: Server returned HTTP response code: 400 for URL: https://docs.google.com/feeds/default/private/full
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
at protocol.CreateFolder(protocol.java:297)
at Documents.main(Documents.java:50)只要有帮助的回复都有份，我可以另开贴，只要有帮助多少分都可以给

Answer 1

//     _httpURLConnection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
//     _httpURLConnection.setRequestProperty("Accept", "text/xml,application/xml,application/xhtml+xml,text/html,text/plain,image/png,*/*");
//     _httpURLConnection.setRequestProperty("Accept-Language", "en-us");
//     //_httpURLConnection.setRequestProperty("Keep-Alive", "false");
//     _httpURLConnection.setRequestProperty("Connection","Keep-Alive");这几句有用吗？ 我之前有个登录的post请求没有用//          OutputStreamWriter out = null;
//         out = new OutputStreamWriter(_httpURLConnection.getOutputStream(), "utf-8"); 
//         int contentlen = postData.toCharArray().length; // .length();          
//         out.write(postData.toCharArray(), 0, contentlen);
这个请求体的写法对吗？ 还是我原来那个好？ 原来那个在登录post中可用 

Answer 2

//          OutputStreamWriter out = null;
//         out = new OutputStreamWriter(_httpURLConnection.getOutputStream(), "utf-8"); 
//         int contentlen = postData.toCharArray().length; // .length();          
//         out.write(postData.toCharArray(), 0, contentlen);
//
//           out.flush();
//           out.close();
         //int contentlen = postData.length();
         OutputStream output = _httpURLConnection.getOutputStream();
         output.write(postData.getBytes());
         //output.write(postData.getBytes(), 0, contentlen);
         output.flush();
         output.close();post的请求体用utf-8
这个请求体是 xml的 应该怎么写呢？

Answer 3

_httpURLConnection.setRequestProperty("Host", "docs.google.com");
_httpURLConnection.setRequestProperty("Content-Length", Integer.toString(lenBody));
这两句是必须的吗？
post请求体的长度这样写是否正确？

Answer 4

请求错误Connection reset
出现在这一句
OutputStream output = _httpURLConnection.getOutputStream();请求错误
Server returned HTTP response code: 400 for URL: https://docs.google.com/feeds/default/private/full/folder%3Aroot/contents
出现在这一句
_httpURLConnection.connect();有经验的给说一下吧

Answer 5

Connection reset  连接被重置Google doc 被 GFW！