从HttpServletRequest获取POST内容

Question

我想从Java Servlet的POST请求中读出数据。这个servlet在Geoserver上作为服务运行，用URL调用。

发布请求(使用python脚本创建):

POST http://localhost:8080/geoserver/ows?request=upload&service=GeoTransfer&version=1.0.0 HTTP/1.1
Host: localhost:8080
User-Agent: python-requests/2.20.0
Accept-Encoding: gzip, deflate
Accept: application/xml
Connection: keep-alive
Authorization: admin:admin
fileName: transfer.xml
Content-Type: application/xml
Content-Length: 489

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<transfer>
  <enviroment>Test</enviroment>
  <product>Testproduct</product>
  <user>admin</user>
</transfer>

Java servlet:

public void upload(HttpServletRequest request, httpServletResponse response)
            throws ServletException, IOException {

        System.out.println("===== Begin headers =====");
        Enumeration<String> names = request.getHeaderNames();
        while (names.hasMoreElements()) {
            String headerName = names.nextElement();
            System.out.println(headerName + " = " + request.getHeader(headerName));
        }
        System.out.println("===== End headers =====\n");


        System.out.println("===== Begin Body =====");
        if ("POST".equalsIgnoreCase(request.getMethod())) {

            try {
                Scanner s = new Scanner(request.getInputStream(), "UTF-8").useDelimiter("\\A");
                System.out.println(s.hasNext() ? s.next() : "");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        System.out.println("===== End Body =====\n");

 }

输出：

===== Begin headers =====
Authorization = admin:admin
fileName = transfer.xml
Accept = application/xml
User-Agent = python-requests/2.20.0
Connection = keep-alive
Host = localhost:8080
Accept-Encoding = gzip, deflate
Content-Length = 489
Content-Type = application/xml
===== End headers =====

===== Begin Body =====

===== End Body =====

问题:

为什么我不能读出xml数据体？请求有问题，数据没有传递给Java吗？

编辑1:

使用Inputstream尝试其他方法，但正文始终是空行。可能是服务器在创建请求对象时忽略了Body并仅使用头的问题吗？

编辑2：

尝试Majid Khakwani回答并获得空字符串。我打印出request.getContentLength（），它是489。该方法是从标题中获取这个数字还是从对象请求中获取内容的真实长度？

Answer 1

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                String xml = null;
                try {
                        byte[] xmlData = new byte[request.getContentLength()];

                        //Start reading XML Request as a Stream of Bytes
                        InputStream sis = request.getInputStream();
                        BufferedInputStream bis = new BufferedInputStream(sis);

                        bis.read(xmlData, 0, xmlData.length);

                        if (request.getCharacterEncoding() != null) {
                                xml = new String(xmlData, request.getCharacterEncoding());
                        } else {
                                xml = new String(xmlData);
                        }
                        //xml and xmlData contains incomplete data
                } catch (IOException ioe) {
                   ...
                }