httpUrlConnection post请求 传参数 及客户端接收参数

//模拟客户端请求
public class ServletMain {

	public static void main(String[] args) {
		TestBean tb=new TestBean("liyangyang","25");
		Gson gson=new Gson();
		//传入的参数
		String datas=gson.toJson(tb);
		String url="http://localhost:8080/ziDingYiTest/index/home.htm?type=ajaxRequest";
		String data=sendPostRequest(url,datas);
                //请求回来的数据
                System.out.println(data);
	}
	
	public static String sendPostRequest(String url,String param){
	    HttpURLConnection httpURLConnection = null;
	    OutputStream out = null; //写
		InputStream in = null;   //读
	    int responseCode = 0;    //远程主机响应的HTTP状态码
	    String result="";
	    try{
	    	URL sendUrl = new URL(url);
			httpURLConnection = (HttpURLConnection)sendUrl.openConnection();
			//post方式请求
			httpURLConnection.setRequestMethod("POST");
			//设置头部信息
			httpURLConnection.setRequestProperty("headerdata", "ceshiyongde");
			//一定要设置 Content-Type 要不然服务端接收不到参数
			httpURLConnection.setRequestProperty("Content-Type", "application/Json; charset=UTF-8");
			//指示应用程序要将数据写入URL连接,其值默认为false（是否传参）
			httpURLConnection.setDoOutput(true);
			//httpURLConnection.setDoInput(true); 
			
			httpURLConnection.setUseCaches(false);
			httpURLConnection.setConnectTimeout(30000); //30秒连接超时
			httpURLConnection.setReadTimeout(30000);    //30秒读取超时
			//传入参数
			out = httpURLConnection.getOutputStream();
			out.write(param.getBytes());
			out.flush(); //清空缓冲区,发送数据
			out.close();
			responseCode = httpURLConnection.getResponseCode();
			//获取请求的资源
			BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(),"UTF-8"));
			result =br.readLine();
	    }catch(Exception e) {
			e.printStackTrace();
		  
	  }
	return result;
	  
  }
}
//服务端的一个方法（客户端请求到此服务端方法）

public void ajaxRequest(HttpServletRequest request, HttpServletResponse response){
		try {
		   //接收请求参数
		    InputStreamReader  reader=new InputStreamReader(request.getInputStream());
		    BufferedReader buffer=new BufferedReader(reader);
		    String data=buffer.readLine();
		    System.out.println(data);
		    
                   //头部信息
		    String header=request.getHeader("headerdata");
		    System.out.println(header);
		        //向客户端发送数据
			response.setContentType("text/javascript");
			Student stu=new Student("liss","44");
			Gson json=new Gson();
			String jString=json.toJson(stu);
			PrintWriter out=response.getWriter();
			out.write(jString);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}