HTTP 请求模拟

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.InetSocketAddress;
import java.net.Socket;

public class HttpSimulator {

    private Socket socket;
    private int port = 80;
    private String host = "localhost";
    private String request = "";
    private boolean isPost, isHead;

    public void run() {

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        while(true) {
            try {
                if(! readHostAndPort(reader)) {
                    break;
                }
                readHttpRequest(reader);
                sendHttpRequest();
                readHttpResponse(reader);
            }
            catch (Exception e) {
                System.out.println("err: " + e.getMessage());
            }
        }
    }

    public static void main(String[] args) {

        new HttpSimulator().run();
    }

    private boolean readHostAndPort(BufferedReader consoleReader) throws IOException {

        System.out.println("host:port> ");
        String[] ss = null;
        String s = consoleReader.readLine();
        if(s.equals("q")) {
            return false;

        }else{
            ss = s.split("[:]");
            if(!ss[0].equals(""))
                host = ss[0];
            if(ss.length > 1)
                port = Integer.parseInt(ss[1]);
            System.out.println(host + ":" + String.valueOf(port));
            return true;
        }
    }

    private void readHttpRequest(BufferedReader consoleReader) throws IOException {

        System.out.println("input HTTP Request: ");
        String s = consoleReader.readLine();
        request = s + "\r\n";

        isPost = s.substring(0, 4).equals("POST");
        isHead = s.substring(0, 4).equals("HEAD");

        while(!(s = consoleReader.readLine()).equals("")) {
            request = request + s + "\r\n";
        }

        request = request + "\r\n";
        if(isPost) {
            System.out.println("input POST Method contents: ");
            s = consoleReader.readLine();
            request = request + s;
        }
    }

    private void sendHttpRequest() throws IOException {

        socket = new Socket();
        socket.setSoTimeout(10 * 1000);
        System.out.println("wait for connecting to server...");
        socket.connect(new InetSocketAddress(host, port), 10 * 1000);
        System.out.println("connected to server successfully!");

        OutputStreamWriter writer = new OutputStreamWriter(socket.getOutputStream());
        writer.write(request);
        writer.flush();
    }

    private void readHttpResponse(BufferedReader consoleReader) {

        String s = "";
        try {
            BufferedReader socketReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            System.out.println("---------- HTTP Header ----------");
            boolean b = true;
            while((s = socketReader.readLine()) != null) {
                if(s.equals("") && b == true && !isHead) {
                    System.out.println("--------------------");
                    b = false;
                    System.out.println("Show HTTP contents or not (Y/N): ");
                    String choice = consoleReader.readLine();
                    if(choice.equals("Y") || choice.equals("y")) {
                        System.out.println("---------- HTTP Contents ----------");
                        continue;
                    }else{
                        break;
                    }
                }else{
                    System.out.println(s);
                }
            }
        }
        catch (Exception e) {
            System.out.println("err: " + e.getMessage());
        }
        finally {
            try {
                socket.close();
            }
            catch (Exception e) {

            }
            System.out.println("--------------------");
        }
    }
}

------ Result ------

host:port>
10.11.121.232:80
input HTTP Request:
GET / HTTP/1.0
Host:10.11.121.232

wait for connecting to server...
connected to server successfully!
---------- HTTP Header ----------
HTTP/1.1 200 OK
Date: Fri, 21 Nov 2014 07:45:18 GMT
Server: Apache/2.2.22 (Ubuntu)
Last-Modified: Wed, 12 Nov 2014 13:06:02 GMT
ETag: "20831-b1-507a90ecdbd88"
Accept-Ranges: bytes
Content-Length: 177
Vary: Accept-Encoding
Connection: close
Content-Type: text/html
--------------------
Show HTTP contents or not (Y/N):