从 HttpServletRequest 获取 POST 内容

Question

我想从Java Servlet中的POST请求中读出数据。此 servlet 作为服务在地理服务器上运行，并使用 URL 进行调用。

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POST 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>

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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：

为什么我无法读出 xml 数据正文？ 请求有问题并且数据没有传递给 Java 吗？

编辑1：

尝试使用输入流的其他方法，但正文始终为空行。 可能是服务器忽略正文并仅使用标头的问题，如果他创建请求对象？

编辑2：

尝试 Majid Khakwani 答案并获得空字符串。 我打印出request.getContentLength()，它是489.该方法是否从标头中获取此数字或从对象请求中获取内容的实际长度？

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) {
...
}