spring boot 中实现兼容不同的请求类型的方法。

　　比如一个接口，既想实现请求参数是application/json,又想实现form提交，改怎么做呢？用postman去测试，发现不可能做到两全其美。

　　我有一个方法，就是不用requestbody，也可以实现json解析，首先是新建一个包装类，这个类可以重复读inputstream里面的东西。

　　如果加了requestbody,就无法用form提交，如果去掉requestbody 那么就无法获取到json里面的值，因为全是null.

 class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private final byte[] body;

    public BodyReaderHttpServletRequestWrapper(HttpServletRequest request)
            throws IOException {
        super(request);
　　　　//编码默认iso-8859-1
        body = StreamUtil.readBytes(request.getReader(), "utf-8");
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {

            @Override
            public int read() throws IOException {
                return bais.read();
            }

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener listener) {

            }
        };

    }

}

　　然后再从inputstream里面拿东西就OK拉

    public static JSONObject receivePost(HttpServletRequest request) throws IOException, UnsupportedEncodingException {

        // 读取请求内容
        BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
        String line = null;
        StringBuilder sb = new StringBuilder();
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }
        //将json字符串转换为json对象
        JSONObject json=JSONObject.parseObject(sb.toString());
        return json;
    }

　　最后在action里面做判断就OK了，大功告成。

        if(servletRequest.getContentType().equals("application/json"))
        {
            servletRequest= new BodyReaderHttpServletRequestWrapper( servletRequest);
            JSONObject d= receivePost(servletRequest);
        }
        else
        {
           Map<String,String[]> map= servletRequest.getParameterMap();

        }