Name: rm29839 Date: 12/16/97


1 make HTTP URLConnection
  send request
  server reply right respose
  send second request
  server close keep-alive connection
  HTTP URLConnection automatically resend request
  but does not send message body

2 demo source
  (including client & server)

import java.io.*;
import java.net.*;

public class Http3 {
    static final String HOST = "localhost";
    static final int PORT = 1000;
    static final int MAX = 30;
    static final int SIZE = 10000;
    static class Server extends Thread {
Server() {
}
public void run() {
ServerSocket ss;
try {
ss = new ServerSocket(PORT);
} catch (IOException e) {
System. out.println("ServerSocket IOException");
return;
}
try {
Socket socket = ss.accept();
DataInputStream dis = new DataInputStream(socket.getInputStream());
PrintWriter pw = new PrintWriter(socket.getOutputStream());

String head;
for (;;) {
head = dis.readLine();
System.out.println(head);
if (head.equals("")) break;
}
String str = dis.readLine();
System.out.println(str);
pw.print("HTTP/1.0 200 OK\r\n");
pw.print("Connection: keep-alive\r\n");
pw.print("Content-length: 12\r\n");
pw.print("\r\n");
pw.print("0123456789\r\n");
pw.flush();

head = dis.readLine();
System.out.println(head);
dis.close();

socket = ss.accept();
dis = new DataInputStream(socket.getInputStream());
pw = new PrintWriter(socket.getOutputStream());
head = dis.readLine();
if (head == null) {
System.out.println("head == null");
dis.close();
ss.close();
return;
}
System.out.println(head);
for (;;) {
head = dis.readLine();
System.out.println(head);
if (head.equals("")) break;
}
str = dis.readLine();
System.out.println(str);
pw.print("HTTP/1.0 200 OK\r\n");
pw.print("Connection: keep-alive\r\n");
pw.print("Content-length: 12\r\n");
pw.print("\r\n");
pw.print("0123456789\r\n");
pw.flush();
dis.close();
ss.close();
} catch (IOException e) {
System. out.println("IOException");
}
}
    }

    public static void main(String args[]) {
Server server = new Server();
server.setDaemon(true);
server.start();
try {
URL url = new URL("http", HOST, PORT, "/file");
URLConnection uc = url.openConnection();
uc.setDoOutput(true);
OutputStream os = uc.getOutputStream();
PrintWriter pw = new PrintWriter(os);
pw.print("ABCDEFGH\r\n");
pw.close();
System.out.println("os.close");
BufferedReader br = new BufferedReader(new InputStreamReader(uc.getInputStream()));
System.out.println("getInputStream");
String str = br.readLine();
System.out.println(str);
br.close();

uc = url.openConnection();
uc.setDoOutput(true);
os = uc.getOutputStream();
pw = new PrintWriter(os);
pw.print("ABCDEFGH\r\n");
pw.close();
System.out.println("os.close");
br = new BufferedReader(new InputStreamReader(uc.getInputStream()));
System.out.println("getInputStream");
str = br.readLine();
System.out.println(str);
br.close();
} catch (MalformedURLException e) {
System.out.println("MalformedURLException");
} catch (IOException e) {
System.out.println("IOException");
}
    }
}

3 no error message
  server waits for message body!

4 no
5 no
(Review ID: 21946)
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