java - 在 Spring MVC 中将请求写入文件

Question

我希望能够将整个请求写入 Spring MVC Controller 中的文件。

我尝试了以下方法，但即使我正在发出带有大量参数的 POST 请求，文件始终为空:

    @RequestMapping(method = RequestMethod.POST, value = "/payments/confirm")
public void receiveCallback(ServletInputStream inputStream)
{
    try
    {
        inputStream.reset();
        byte[] data = IOUtils.toByteArray(inputStream);

        File file = new File(System.getProperty("java.io.tmpdir") + "test" + System.currentTimeMillis() + ".txt");
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(data);
        fos.close();
    }
    catch (Exception e)
    {
        logger.error("Error writing request", e);
    }
}

我也尝试过使用 HttpServletRequest.getInputStream()，但结果相同。

Answer 1

使用 InputStream 是行不通的(参见 BalusC 的回答)。下面是一个示例，说明如何使用 HTTPServletRequest 对象来代替编写 header 和参数:

@RequestMapping(method = RequestMethod.POST, value = "/payments/confirm")
public void receiveCallback(HttpServletRequest request) {
    try {
        StringBuilder sb = new StringBuilder();
        sb.append("Headers:\n");
        Enumeration<String> headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String headerName = headerNames.nextElement();
            Enumeration<String> headers = request.getHeaders(headerName);
            while (headers.hasMoreElements()) {
                String headerValue = headers.nextElement();
                sb.append(headerName).append(':').append(headerValue).append('\n');
            }
        }
        sb.append("\nParameters:\n");
        for(Entry entry: (Set<Entry>) request.getParameterMap().entrySet(){
            sb.append(entry.getKey()).append(':').append(entry.getValue()).append('\n');
        }
        byte[] data = sb.toString().getBytes();

        File file = new File(System.getProperty("java.io.tmpdir") + "test"
                + System.currentTimeMillis() + ".txt");
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(data);
        fos.close();
    } catch (Exception e) {
        logger.error("Error writing request", e);
    }
}