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  • Spring对POST内容进行处理的坑

    有次和某第三方公司调试接口,他们的协议很奇葩:Content-Type用application/x-www-form-urlencoded,然而内容却是把图片内容直接写了进去。在Spring中用

    @RequestBody byte[] data
    

      去接数据的时候,发现内容都被URLEncode编码了,无法取得原始的流。跟踪源码到:

    RequestResponseBodyMethodProcessor
    。。。。
    ServletServerHttpRequest inputMessage = new ServletServerHttpRequest(servletRequest);
            Object arg = this.readWithMessageConverters(inputMessage, parameter, paramType);
    

      Spring把request包装了一层传递了下去,跟踪进去,他的getBody方法

     public InputStream getBody() throws IOException {
            return (InputStream)(isFormPost(this.servletRequest) ? getBodyFromServletRequestParameters(this.servletRequest) : this.servletRequest.getInputStream());
        }
    

      看isFormPost

    private static boolean isFormPost(HttpServletRequest request) {
            String contentType = request.getContentType();
            return contentType != null && contentType.contains("application/x-www-form-urlencoded") && HttpMethod.POST.matches(request.getMethod());
        }
    

      看getBodyFromServletRequestParameters方法

    private static InputStream getBodyFromServletRequestParameters(HttpServletRequest request) throws IOException {
            ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
            Writer writer = new OutputStreamWriter(bos, "UTF-8");
            Map<String, String[]> form = request.getParameterMap();
            Iterator nameIterator = form.keySet().iterator();
    
            while(nameIterator.hasNext()) {
                String name = (String)nameIterator.next();
                List<String> values = Arrays.asList((Object[])form.get(name));
                Iterator valueIterator = values.iterator();
    
                while(valueIterator.hasNext()) {
                    String value = (String)valueIterator.next();
                    writer.write(URLEncoder.encode(name, "UTF-8"));
                    if (value != null) {
                        writer.write(61);
                        writer.write(URLEncoder.encode(value, "UTF-8"));
                        if (valueIterator.hasNext()) {
                            writer.write(38);
                        }
                    }
                }
    
                if (nameIterator.hasNext()) {
                    writer.append('&');
                }
            }
    
            writer.flush();
            return new ByteArrayInputStream(bos.toByteArray());
        }
    

      无解,只能让他们修改调用协议,不要用application/x-www-form-urlencoded

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  • 原文地址:https://www.cnblogs.com/bobdeng/p/8965754.html
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