Java implementation HTTP protocol send receive data

Java simulation Post/get Way to send data the main method is in the post

Import java.io.*;
Import java.net.HttpURLConnection;
Import Java.net.URL;


Import Java.net.URLEncoder;

    public class Httpurl {private static final String TAG = "NetUtils"; /** * Use post to login * * @param username * @param password * @return/public static void M
        Ain (String []args) {Httpurl test=new httpurl ();
    Test.loginofpost ("Niha", "qwer1234");
        public static string Loginofpost (string username, string password) {HttpURLConnection conn = null;
            try {//Create a URL object url murl = new URL ("http://localhost:12001");

            Call the OpenConnection () method of the URL to get the HttpURLConnection object conn = (httpurlconnection) murl.openconnection (); Conn.setrequestmethod ("post"); The set request method is POST/* conn.setreadtimeout (5000);/set read timeout of 5 seconds Conn.set
     ConnectTimeout (10000);/Set Connection network timeout of 10 seconds/conn.setdooutput (true);/Set this method to allow output to the server int len=0;       String path= "E:\\private_project\\github_project\\nsar\\test.txt";
            The parameter of the POST request byte[] buf= new byte[10240];
            FileInputStream fis=new FileInputStream (path);
            while (len = Fis.read (buf))!=-1) {System.out.print (len);
            }//String data = "Username=" + username + "&password=" + password;            Obtains an output stream, writes the data to the server, by default, the system does not allow to output the content to the server outputstream out = Conn.getoutputstream ();//get an output stream, write data to the server/
            Out.write (Data.getbytes ());
            Out.write (BUF);
            Out.flush ();

            Out.close ();

                int responsecode = Conn.getresponsecode ()//Call this method eliminates the need to use the Conn.connect () method if (Responsecode = = 200) {
                InputStream is = Conn.getinputstream ();
                String state = Getstringfrominputstream (IS);
            return state;
                else {//LOG.I (TAG, "Access failed" + Responsecode); System.out.Print ("Access failed");
        } catch (Exception e) {e.printstacktrace (); finally {if (conn!= null) {conn.disconnect ();//Close Connection}} RET
    Urn null; /** * Use get way to login * * @param username * @param password * @return * * public static

        String Loginofget (string username, string password) {HttpURLConnection conn = null;
        String data = "Username=" + urlencoder.encode (username) + "&password=" + urlencoder.encode (password); String url = "Http://192.168.0.100:8080/android/servlet/LoginServlet?"
        + data;
            try {//Use string URL to build URL object url murl = new URL (URL);

            conn = (httpurlconnection) murl.openconnection ();
            Conn.setrequestmethod ("get");
            Conn.setreadtimeout (5000);

            Conn.setconnecttimeout (10000);
            int responsecode = Conn.getresponsecode (); if (rEsponsecode = = {InputStream is = Conn.getinputstream ();
                String state = Getstringfrominputstream (IS);
            return state;
                else {//LOG.I (TAG, "Access failed" + Responsecode);

            System.out.print ("Access failed");
        } catch (Exception e) {e.printstacktrace ();
            finally {if (conn!= null) {conn.disconnect ();
    } return null; /** * Returns a string message based on stream * * @param is * @return * @throws IOException/Private St atic String Getstringfrominputstream (InputStream is) throws IOException {Bytearrayoutputstream OS = n
        EW Bytearrayoutputstream ();
        Template code must be skilled byte[] buffer = new byte[1024];
        int len =-1;  Be sure to write Len=is.read (buffer)//if while ((Is.read (buffer))!=-1 cannot write data to the buffer while (len = is.read (buffer)
!=-1) {            Os.write (buffer, 0, Len);
        } is.close ();
        string state = Os.tostring ()//Converts the data in the stream to a string, using the encoding utf-8 (emulator default encoding) Os.close ();
    return state;

 }
}

Java simulation server-side receive Post/get data implementation does not need to return data to the client, only need to accept the data sent by the client so response commented out

Import Java.io.BufferedReader;
Import Java.io.InputStreamReader;
Import Java.net.ServerSocket;

Import Java.net.Socket;
 /** * Created by Lpeiz on 2016/9/26. */public class Server {public static void main (string[] args) {try {ServerSocket ServerSocket
= new ServerSocket (12001); 
            System.out.println ("HTTP Server (only POST implemented) is ready and are listening on Port number 12001 \ n"); while (true) {Socket clientsocket = serversocket.accept ();//System.out.print
                ln (clientsocket.getinetaddress (). toString () + "" + Clientsocket.getport ());
BufferedReader in = new BufferedReader (New InputStreamReader (Clientsocket.getinputstream ()));
                OutputStream out = Clientsocket.getoutputstream ();
                String temp;
                int i=1001;
while ((Temp=in.readline ())!= null) System.out.println (temp+i++); String response = "http/1.1 ok\n\r";
Response = response + "Date:fri, May 2001 20:08:11 gmt\n\r";
Response = response + "Server:sanjits server\n\r";
Response = response + "connection:close\n\r";
Response = response + "1";
byte[] bytes = Response.getbytes ();
Byte[]bytes=new byte[1024];
Out.write (bytes);
                Out.flush ();
In.close ();
            Out.close ();
            The catch (Exception e) {System.out.println ("ERROR:" + e.getmessage ());
        System.exit (1);

 }}}

Before the national day to see a case but ran when found to be wrong 13 years ago, now still use this count also really need to learn more advanced technology

Https://coderanch.com/t/205623/java/Java-Http-Server-Java-Http

On the client's program with reference to other successful procedures found on the Internet, and added two lines to find success ...

Con.setreadtimeout (5000)//Set read timeout of 5 seconds
            Con.setconnecttimeout (10000);/Set Connection network timeout of 10 seconds

This is the two lines of control time, and still don't understand why. Might be a refresh problem after the execution of a statement similar to a JDBC connection

public class Client {public static void main (string[] args) {try {URL url = new URL ("Http://loc
            Alhost:12001 ");
            HttpURLConnection con = (httpurlconnection) url.openconnection ();
Con.setdooutput (TRUE);
            Con.setdoinput (TRUE);
Con.setrequestmethod ("POST");
            Con.setusecaches (FALSE); Con.setreadtimeout (5000)//Set read timeout of 5 seconds con.setconnecttimeout (10000);/Set Connection network timeout of 10 seconds String test =
            "<name>Hello</name>";

byte[] bytes = Test.getbytes ();

            Con.setrequestproperty ("Content-type", "text/html");

            OutputStream out = Con.getoutputstream ();
            Out.write (bytes);
            Out.flush ();
            Out.close ();
            BufferedReader in = new BufferedReader (New InputStreamReader (Con.getinputstream ()));
            String temp;
while (temp = In.readline ())!= null) System.out.println (temp); //            Out.close ();
            In.close ();
        Con.disconnect ();
            catch (Exception e) {e.printstacktrace ();
 System.exit (1);}}}