Web Server (Java version)

Import java.io.BufferedReader;
 Import java.io.IOException;
 Import the java.io.InputStreamReader;
 Import java.io.PrintWriter;
 Import the java.net.ServerSocket;
 Import the java.net.Socket; 

/ ** 
 * * @Description: // TODO simple HTTP server, in fact, accept the HTTP request and parse the request, * @author: sunfch 
 * * @date: 2019/1/3 16:35 * @Param: * @return: 
 * / 
public  class the HttpServer {
     public  static  void main (String [] args) {
         the try {
             / * listening port number, as long as it can receive the 8888 * /  
            the ServerSocket SS = new newThe ServerSocket (8888 );
             the while ( to true ) {
                 / * Examples of the client, a fixed routine, accepted by the target server, the client generates the corresponding instance * /  
                the Socket Socket = ss.accept ();
                 / * Get Client Input basic information flow, a request is over: request header, line breaks, the request body * /  
                the BufferedReader BD = new new the BufferedReader ( new new the InputStreamReader (Socket.getInputStream ()));
                 / ** * accept HTTP requests, and parse the data * / 
                String RequestHeader; 
                int contentLength = 0 ;
                 the while ! ((RequestHeader = bd.readLine ()) =null &&! requestHeader.isEmpty ()) { 
                    System.out.println (RequestHeader); 
                    / ** * GET parameter obtained * / 
                    IF (requestHeader.startsWith ( "GET" )) {
                         int the begin = requestHeader.indexOf ( "/" );
                         int End = requestHeader.indexOf ( "the HTTP /" ); 
                        String for condition Condition = requestHeader.substring (the begin, End); 
                        System.out.println ( "the gET parameter is:" + for condition Condition); 
                    } 
                    / ** * obtained POST 1. The content acquisition request parameter * length * / 
                    IF (requestHeader.startsWith("Content-Length")) {
                        int begin = requestHeader.indexOf("Content-Lengh:") + "Content-Length:".length();
                        String postParamterLength = requestHeader.substring(begin+1).trim();
                        contentLength = Integer.parseInt(postParamterLength);
                        System.out.println("POST参数长度是：" + Integer.parseInt(postParamterLength));
                    }
                }
                StringBuffer sb = new StringBuffer();
                if (contentLength > 0) {
                    for (int i = 0; i < contentLength; i++) {
                        sb.append((char) bd.read());
                    }
                    System.out.println("POST参数是：" + sb.toString());
                }
                /* 发送回执 */ 
                PrintWriter pw = new PrintWriter(socket.getOutputStream());
                pw.println("HTTP/1.1 200 OK");
                pw.println("Content-type:text/html");
                pw.println();
        
                pw.println("<HTML>");
                pw.println("<TITLE>Index</TITLE>");
                pw.println("<BODY>");
                pw.println("<P>Welcome to J. David's webserver.");
                pw.println("<H1>CGI demo1");
                pw.println("<FORM ACTION=\"color.cgi\" METHOD=\"POST\">");
                pw.println("Enter a color: <INPUT TYPE=\"text\" NAME=\"color\">");
                pw.println("<P>");
                pw.println("Enter a number: <INPUT TYPE=\"text\" NAME=\"number\">");
                pw.println("<INPUT TYPE=\"submit\">");
                pw.println("</FORM>");
                pw.println("</BODY>");
                pw.println("</HTML>");
                
    
                pw.flush();
                socket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
Web Server (Java version)

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