在BLOGJAVA上看到一篇关于HTTP SERVER的简单实现，博文网址为：
http://www.blogjava.net/beansoft/archive/2007/06/25/126049.html，
关于HTTP 协议更多信息，请参考：
WIKI，
RFC2616。下面我的实现：
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URLDecoder;
/**
* 简单HTTP服务器
*
* @author kinkding
*/
public class MyHTTPServer implements Runnable {
ServerSocket server;
int port = 80;
public MyHTTPServer() throws IOException {
server = new ServerSocket(port);
new Thread(this).start();
System.out.println("HTTP服务器已经启动");
}
public void run() {
while (true) {
try {
Socket client = server.accept();
System.out.println("接收到客户端：" + client);
BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));
System.out.println("请求内容如下：\n---------------------");
String line = reader.readLine();
System.out.println(line);
// 请求的资源
String resource = line.substring(line.indexOf("/"), line.lastIndexOf("/") - 5);
resource = URLDecoder.decode(resource, "UTF-8");
// 请求方法：GET/POST
String method = line.split(" ")[0];
int length = 0;
while ((line = reader.readLine()) != null && line.length() > 0) {
if (line.startsWith("Content-Length") && length == 0) {
length = Integer.parseInt(line.substring(line.indexOf(":") + 1).trim());
}
System.out.println(line);
}
System.out.println("---------------------");
String postData = "";
if (method.equals("POST") && length > 0) {
char cbuf[] = new char[length];
reader.read(cbuf, 0, length);
postData = new String(cbuf);
}
if (resource.endsWith(".jpg")) {
this.sendFile("happyTime.jpg", client);
client.close();
} else if (resource.endsWith(".do")) {
// 返回404
PrintWriter out = new PrintWriter(client.getOutputStream(), true);
out.println("HTTP/1.0 404 Not found");
out.println();
out.close();
} else {
PrintWriter out = new PrintWriter(client.getOutputStream(), true);
out.println("HTTP/1.0 200 OK");
out.println("Content-Type:text/html;charset=GBK");
out.println();// HTTP协议：空行表示信息结束
out.println("<UL>");
out.println("<LI>Hello World");
out.println("<LI><img src='anyJPG.jpg'/>");
out.println("<LI>resource:" + resource);
out.println("<LI>method:" + method);
out.println("<LI><a href='foobar.do'>foobar.do</a>");
out.println("</UL>");
// 测试POST
out.println("<form method='post' action='/'>");
out.println("<input type='text' name='name' value=''/>");
out.println("<input type='submit' value='POST'/>");
out.println("POST DATA:" + postData);
out.println("</form>");
// 测试GET
out.println("<form method='get' action='/'>");
out.println("<input type='text' name='job' value=''/>");
out.println("<input type='submit' value='GET'/>");
out.println("</form>");
out.close();
client.close();
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
private void sendFile(String name, Socket client) throws IOException {
PrintStream out = new PrintStream(client.getOutputStream(), true);
File fileToSend = new File(name);
if (fileToSend.exists() && !fileToSend.isDirectory()) {
out.println("HTTP/1.0 200 OK");
out.println("Content-Type:application/binary");
out.println("Content-Length:" + fileToSend.length());
out.println();
FileInputStream fis = new FileInputStream(fileToSend);
byte buf[] = new byte[1024];
int size = 0;
while ((size = fis.read(buf)) > 0) {
out.write(buf, 0, size);
}
out.close();
fis.close();
}
}
public static void main(String[] args) {
try {
new MyHTTPServer();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
运行之后，控制台的输出类似如下：
HTTP服务器已经启动
接收到客户端：Socket[addr=/127.0.0.1,port=1198,localport=80]
请求内容如下：
---------------------
GET / HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*
Accept-Language: zh-cn
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: localhost
Connection: Keep-Alive
---------------------
接收到客户端：Socket[addr=/127.0.0.1,port=1199,localport=80]
请求内容如下：
---------------------
GET /anyJPG.jpg HTTP/1.1
Accept: */*
Referer: http://localhost/
Accept-Language: zh-cn
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: localhost
Connection: Keep-Alive
---------------------
接收到客户端：Socket[addr=/127.0.0.1,port=1218,localport=80]
请求内容如下：
---------------------
POST / HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*
Referer: http://localhost/
Accept-Language: zh-cn
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: localhost
Content-Length: 7
Connection: Keep-Alive
Cache-Control: no-cache
---------------------
接收到客户端：Socket[addr=/127.0.0.1,port=1231,localport=80]
请求内容如下：
---------------------
GET /?job=aaa HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*
Referer: http://localhost/
Accept-Language: zh-cn
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: localhost
Connection: Keep-Alive
---------------------
页面运行效果类似如下：
另，推荐一个不错的命令行“netstat -an |find /i "listening" >good.txt”，查看当前处于监听状态的IP及端口，并将得到的信息重定向到good.txt中，形如：
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2366 0.0.0.0:0 LISTENING
TCP 0.0.0.0:19771 0.0.0.0:0 LISTENING
TCP 127.0.0.1:1031 0.0.0.0:0 LISTENING