http请求连tomcat服务器做下笔记

URL url = null;
HttpURLConnection httpurlconnection = null;
String str ="";
try{
//设置代理上外网
//System.getProperties().setProperty("proxySet", "true");
//System.getProperties().setProperty("http.proxyHost", "***.***.***.***");
//System.getProperties().setProperty("http.proxyPort", "80");
//如果需要验证用户
//Authenticator.setDefault(new MyAuthenticator("HOME\\user","password"));	
url = new URL("http://127.0.0.1:80/***/servlet/test");
httpurlconnection = (HttpURLConnection) url.openConnection();
httpurlconnection.setDoOutput(true);
httpurlconnection.setRequestMethod("POST");
httpurlconnection.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.0");
httpurlconnection.setRequestProperty("Content-Type","text/xml;charset=UTF-8");
String postStr="*****";	      httpurlconnection.getOutputStream().write(postStr.getBytes("UTF-8"));
httpurlconnection.getOutputStream().flush();
httpurlconnection.getOutputStream().close();
int code = httpurlconnection.getResponseCode();
InputStream i = httpurlconnection.getInputStream();
byte[] buffer = new byte[51];
ByteArrayOutputStream bo = new ByteArrayOutputStream();
int read = 0;
do{
    bo.write(buffer, 0, read);
    read = i.read(buffer, 0, 50); 
}while(read!=-1);
System.out.println(new String(bo.toByteArray(),"UTF-8"));
}catch(Exception e){
    e.printStackTrace();
} finally{
    if(httpurlconnection!=null){
        httpurlconnection.disconnect();
    }System.out.println("end:"+System.currentTimeMillis());
}

 

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		InputStream i = request.getInputStream();
		byte[] buffer = new byte[1001];
		ByteArrayOutputStream bo = new ByteArrayOutputStream();
		int read = 0;
		do{
			bo.write(buffer, 0, read);
			read = i.read(buffer, 0, 1000); 
		}while(read!=-1);
		new String(bo.toByteArray(),"UTF-8");
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("***");
		out.flush();
		out.close();
		try {Thread.sleep(3000);} catch (InterruptedException e) {}
		System.out.println("end:"+System.currentTimeMillis());
	}

 

在httpurlconnection.getResponseCode()时请求被发送，服务器servlet开始执行，

在servlet执行out.flush()时httpurlconnection.getResponseCode()阻塞结束；

在servlet执行out.close()时i.read()阻塞结束，连接已完成，而无需等到servlet的post方法运行完成。