java 获取request请求因素

java web，如何获取request中的请求参数呢？

/***
	 * Get request query string
	 * @param request
	 * @return   byte[]
	 */
	public byte[] getRequestStr(HttpServletRequest request){
		int contentLength = request.getContentLength();
		byte buffer[] = new byte[contentLength];
		for (int i = 0; i < contentLength;) {
			try {

				int readlen = request.getInputStream().read(buffer, i,
						contentLength - i);
				if (readlen == -1) {
					break;
				}
				i += readlen;
			} catch (IOException ioexception) {
				ioexception.printStackTrace();
			} finally {
				// logger.info("Json Request:" + requestPacket);
			}
		}
		return buffer;
	}

 上述方法返回的是byte数组。

下面的方法直接返回字符串：

/***
	 * Get request query string
	 * 
	 * @param request
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String getRequestStr(HttpServletRequest request) throws UnsupportedEncodingException{
		byte buffer[]=getRequestBytes(request);
		String charEncoding=request.getCharacterEncoding();
		if(charEncoding==null){
			charEncoding="UTF-8";
		}
		return new String(buffer,charEncoding);
	}

应用：上述方法一般用于在filter（javax.servlet.Filter）中获取请求参数，进行转发