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java - 从 HttpServletRequest 获取 POST 内容

问题描述

我想从Java Servlet中的POST请求中读出数据。该 servlet 作为服务在 Geoserver 上运行并使用 URL 调用。

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>

Java 小服务程序： 

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？请求有问题并且数据没有传递给Java吗？

编辑1：

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

编辑2：

尝试 Majid Khakwani 回答并获得空字符串。我打印出来request.getContentLength()，它是489。该方法是从标头中获取此数字还是从对象请求中获取内容的实际长度？

标签： javahttppostservlets

解决方案

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) {
                   ...
                }

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