java web获取请求体内容

Java Web中如何获取请求体内容呢？

我们知道请求方式分为两种：Get，Post。

/***
     * Compatible with GET and POST
     *
     * @param request
     * @return : <code>byte[]</code>
     * @throws IOException
     */
    public static byte[] getRequestQuery(HttpServletRequest request)
            throws IOException {
        String submitMehtod = request.getMethod();
        String queryString = null;  

        if (submitMehtod.equals("GET")) {// GET
            queryString = request.getQueryString();
            String charEncoding = request.getCharacterEncoding();// charset
            if (charEncoding == null) {
                charEncoding = "UTF-8";
            }
            return queryString.getBytes(charEncoding);
        } else {// POST
            return getRequestPostBytes(request);
        }
    }  

/***
     * Get request query string, form method : post
     *
     * @param request
     * @return byte[]
     * @throws IOException
     */
    public static byte[] getRequestPostBytes(HttpServletRequest request)
            throws IOException {
        int contentLength = request.getContentLength();
        if(contentLength<0){
            return null;
        }
        byte buffer[] = new byte[contentLength];
        for (int i = 0; i < contentLength;) {  

            int readlen = request.getInputStream().read(buffer, i,
                    contentLength - i);
            if (readlen == -1) {
                break;
            }
            i += readlen;
        }
        return buffer;
    }
/***
     * Get request query string, form method : post
     *
     * @param request
     * @return
     * @throws IOException
     */
    public static String getRequestPostStr(HttpServletRequest request)
            throws IOException {
        byte buffer[] = getRequestPostBytes(request);
        String charEncoding = request.getCharacterEncoding();
        if (charEncoding == null) {
            charEncoding = "UTF-8";
        }
        return new String(buffer, charEncoding);
    }  

说明：当请求方式为“Get”时，直接使用request.getQueryString()获取String

当请求方式为“Post”时，读取InputStream（request.getInputStream()）