gistfile1.java

//通过第一步成功登陆后获得cookie值
String cookieVal = conn.getHeaderField("Set-Cookie");
String newUrlStr = "http://www.zuidaima.com/mood/create.htm";

//打开新连接
URL newUrl = new URL(newUrlStr);
HttpURLConnection newConn = (HttpURLConnection) newUrl.openConnection();

newConn.setRequestMethod("POST");
newConn.setDoOutput(true);
newConn.setDoInput(true);

//请求头
newConn.setRequestProperty("Connection", "keep-alive");
newConn.setRequestProperty("Cookie", cookieVal);

//要发送的内容（就像抓包那样看到的）
String BOUNDARY = "------WebKitFormBoundaryfV9cW5irwPumXS5m\r\n";
String newSend = BOUNDARY + "Content-Disposition: form-data; name=\"content\"\r\n\r\n";		
newSend += "my test" + BOUNDARY;
newSend += "Content-Disposition: form-data; name=\"file\"; filename=\"\"\r\n";
newSend += "Content-Type: application/octet-stream";
newSend += "------WebKitFormBoundaryfV9cW5irwPumXS5m--\r\n";

//以下是查看返回信息
InputStream in = newConn.getInputStream();

BufferedReader buffer = new BufferedReader(new InputStreamReader(in, "UTF-8"));

String s;
StringBuilder str = new StringBuilder();

while ((s = buffer.readLine()) != null) {
	str.append(s);
}

System.out.print(newConn.getResponseCode() + "\n" + str.toString());