http post提交entity,后台接收

 BufferedReader br = null;
		try {
			br = new BufferedReader(new InputStreamReader(request.getInputStream()));
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	        String line = null;
	        StringBuilder sb = new StringBuilder();
	        try {
				while((line = br.readLine())!=null){
				    sb.append(line);
				}
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}

	        // 将资料解码
	        String reqBody = sb.toString();