Netty 웹서버 구성

1. https://github.com/netty/netty -> 4.0.56.Final 버전으로 다운

2. 압축해제 후 생긴 디렉토리를 인텔리제이로 Open

3. Netty-4.0.56.Final > example > ~ > HttpSaticFileServer.java 실행

4. HttpSaticFileServerHandler 파일을 열고 이미지 경로를 지정해준다.
-이미지경로 : 압축해제한 디렉토리 /examples
-buf.append("<img src = \"img.jpg\">")를 삽입한다.

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.http.file;
 
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelProgressiveFuture;
import io.netty.channel.ChannelProgressiveFutureListener;
import io.netty.channel.DefaultFileRegion;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpChunkedInput;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.ssl.SslHandler;
import io.netty.handler.stream.ChunkedFile;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.SystemPropertyUtil;
 
import javax.activation.MimetypesFileTypeMap;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.sql.*;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.Pattern;
 
import static io.netty.handler.codec.http.HttpHeaders.Names.*;
import static io.netty.handler.codec.http.HttpMethod.*;
import static io.netty.handler.codec.http.HttpResponseStatus.*;
import static io.netty.handler.codec.http.HttpVersion.*;
 
/**
 * A simple handler that serves incoming HTTP requests to send their respective
 * HTTP responses.  It also implements {@code 'If-Modified-Since'} header to
 * take advantage of browser cache, as described in
 * <a href="http://tools.ietf.org/html/rfc2616#section-14.25">RFC 2616</a>.
 *
 * <h3>How Browser Caching Works</h3>
 *
 * Web browser caching works with HTTP headers as illustrated by the following
 * sample:
 * <ol>
 * <li>Request #1 returns the content of {@code /file1.txt}.</li>
 * <li>Contents of {@code /file1.txt} is cached by the browser.</li>
 * <li>Request #2 for {@code /file1.txt} does not return the contents of the
 *     file again. Rather, a 304 Not Modified is returned. This tells the
 *     browser to use the contents stored in its cache.</li>
 * <li>The server knows the file has not been modified because the
 *     {@code If-Modified-Since} date is the same as the file's last
 *     modified date.</li>
 * </ol>
 *
 * <pre>
 * Request #1 Headers
 * ===================
 * GET /file1.txt HTTP/1.1
 *
 * Response #1 Headers
 * ===================
 * HTTP/1.1 200 OK
 * Date:               Tue, 01 Mar 2011 22:44:26 GMT
 * Last-Modified:      Wed, 30 Jun 2010 21:36:48 GMT
 * Expires:            Tue, 01 Mar 2012 22:44:26 GMT
 * Cache-Control:      private, max-age=31536000
 *
 * Request #2 Headers
 * ===================
 * GET /file1.txt HTTP/1.1
 * If-Modified-Since:  Wed, 30 Jun 2010 21:36:48 GMT
 *
 * Response #2 Headers
 * ===================
 * HTTP/1.1 304 Not Modified
 * Date:               Tue, 01 Mar 2011 22:44:28 GMT
 *
 * </pre>
 */
public class HttpStaticFileServerHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
 
    public static final String HTTP_DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss zzz";
    public static final String HTTP_DATE_GMT_TIMEZONE = "GMT";
    public static final int HTTP_CACHE_SECONDS = 60;
 
 
 
    @Override
    public void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
 
        System.out.println("어디로 가는거야? 1");
        if (!request.getDecoderResult().isSuccess()) {
            System.out.println("어디로 가는거야? 2");
            sendError(ctx, BAD_REQUEST);
            return;
        }
 
        if (request.getMethod() != GET) {
            System.out.println("어디로 가는거야? 3");
            sendError(ctx, METHOD_NOT_ALLOWED);
            return;
        }
 
        final String uri = request.getUri();
 
        final String path = sanitizeUri(uri);
        if (path == null) {
            System.out.println("어디로 가는거야? 4");
            sendError(ctx, FORBIDDEN);
            return;
        }
 
 
 
 
        File file = new File(path);
 
 
        System.out.println("ㅎ"+uri+"ㅎ");
        if(uri.equals("/big.html")){
            sendListing_big(ctx, file, uri);
        }
        if(uri.equals("/small2.html")){
            sendListing_small1(ctx, file, uri);
        }
        if(uri.equals("/small1.html")){
            sendListing_small2(ctx, file, uri);
        }
        if(uri.equals("/text.html")){
            sendListing(ctx, file, uri);
        }
 
 
        if (file.isHidden() || !file.exists()) {
            System.out.println("어디로 가는거야? 5");
            sendError(ctx, NOT_FOUND);
            return;
        }
 
 
 
 
 
 
        System.out.println("/big.html");
        System.out.println("ㅎ"+uri+"ㅎ");
        if (file.isDirectory()) {
            System.out.println("어디로 가는거야? 6");
            //if (uri.endsWith("/")) {
                System.out.println("ㅡ"+uri+"ㅡ");
                if(uri.equals("/big.html")){
                    sendListing_big(ctx, file, uri);
                }
                if(uri.equals("/small2.html")){
                    sendListing_small1(ctx, file, uri);
                }
                if(uri.equals("/small1.html")){
                    sendListing_small2(ctx, file, uri);
                }
                if(uri.equals("/text.html")){
                    sendListing(ctx, file, uri);
                }
            //} else {
                System.out.println("ㅡ"+uri+"ㅡ");
                sendRedirect(ctx, uri + '/');
 
            //}
            return;
        }
 
        if (!file.isFile()) {
            System.out.println("어디로 가는거야? 7");
            sendError(ctx, FORBIDDEN);
            return;
        }
 
        // Cache Validation
        String ifModifiedSince = request.headers().get(IF_MODIFIED_SINCE);
        if (ifModifiedSince != null && !ifModifiedSince.isEmpty()) {
            System.out.println("어디로 가는거야? 8");
            SimpleDateFormat dateFormatter = new SimpleDateFormat(HTTP_DATE_FORMAT, Locale.US);
            Date ifModifiedSinceDate = dateFormatter.parse(ifModifiedSince);
 
            // Only compare up to the second because the datetime format we send to the client
            // does not have milliseconds
            long ifModifiedSinceDateSeconds = ifModifiedSinceDate.getTime() / 1000;
            long fileLastModifiedSeconds = file.lastModified() / 1000;
            if (ifModifiedSinceDateSeconds == fileLastModifiedSeconds) {
                sendNotModified(ctx);
                return;
            }
        }
 
        RandomAccessFile raf;
        try {
            System.out.println("어디로 가는거야? 9");
            raf = new RandomAccessFile(file, "r");
        } catch (FileNotFoundException ignore) {
            sendError(ctx, NOT_FOUND);
            return;
        }
        long fileLength = raf.length();
 
        HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
        HttpHeaders.setContentLength(response, fileLength);
        setContentTypeHeader(response, file);
        setDateAndCacheHeaders(response, file);
        if (HttpHeaders.isKeepAlive(request)) {
            System.out.println("어디로 가는거야? 10");
            response.headers().set(CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
        }
 
        // Write the initial line and the header.
        ctx.write(response);
 
        // Write the content.
        ChannelFuture sendFileFuture;
        ChannelFuture lastContentFuture;
        if (ctx.pipeline().get(SslHandler.class) == null) {
            System.out.println("어디로 가는거야? 11");
            sendFileFuture =
                    ctx.write(new DefaultFileRegion(raf.getChannel(), 0, fileLength), ctx.newProgressivePromise());
            // Write the end marker.
            lastContentFuture = ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
        } else {
            System.out.println("어디로 가는거야? 12");
            sendFileFuture =
                    ctx.writeAndFlush(new HttpChunkedInput(new ChunkedFile(raf, 0, fileLength, 8192)),
                            ctx.newProgressivePromise());
            // HttpChunkedInput will write the end marker (LastHttpContent) for us.
            lastContentFuture = sendFileFuture;
        }
 
        sendFileFuture.addListener(new ChannelProgressiveFutureListener() {
            @Override
            public void operationProgressed(ChannelProgressiveFuture future, long progress, long total) {
                if (total < 0) { // total unknown
                    System.err.println(future.channel() + " Transfer progress: " + progress);
                } else {
                    System.err.println(future.channel() + " Transfer progress: " + progress + " / " + total);
                }
            }
 
            @Override
            public void operationComplete(ChannelProgressiveFuture future) {
                System.err.println(future.channel() + " Transfer complete.");
            }
        });
 
        // Decide whether to close the connection or not.
        if (!HttpHeaders.isKeepAlive(request)) {
            System.out.println("어디로 가는거야? 13");
            // Close the connection when the whole content is written out.
            lastContentFuture.addListener(ChannelFutureListener.CLOSE);
        }
    }
 
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        if (ctx.channel().isActive()) {
            sendError(ctx, INTERNAL_SERVER_ERROR);
        }
    }
 
    private static final Pattern INSECURE_URI = Pattern.compile(".*[<>&\"].*");
 
    private static String sanitizeUri(String uri) {
        // Decode the path.
        try {
            uri = URLDecoder.decode(uri, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new Error(e);
        }
 
        if (uri.isEmpty() || uri.charAt(0) != '/') {
            return null;
        }
 
        // Convert file separators.
        uri = uri.replace('/', File.separatorChar);
 
        // Simplistic dumb security check.
        // You will have to do something serious in the production environment.
        if (uri.contains(File.separator + '.') ||
            uri.contains('.' + File.separator) ||
            uri.charAt(0) == '.' || uri.charAt(uri.length() - 1) == '.' ||
            INSECURE_URI.matcher(uri).matches()) {
            return null;
        }
 
        // Convert to absolute path.
        return SystemPropertyUtil.get("user.dir") + File.separator + uri;
    }
 
    private static final Pattern ALLOWED_FILE_NAME = Pattern.compile("[^-\\._]?[^<>&\\\"]*");

    private static void sendListing_big(ChannelHandlerContext ctx, File dir, String dirPath) {

        System.out.println("sendListing_big 실행됨");

        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK);
        response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");

        StringBuilder buf = new StringBuilder()
                .append("<!DOCTYPE html>\r\n")
                .append("<html><head><meta charset='utf-8' />");
        buf.append("<img src=\"big.jpg\" width=\"100\" height=\"50\">");




        buf.append("</ul></body></html>\r\n");
        ByteBuf buffer = Unpooled.copiedBuffer(buf, CharsetUtil.UTF_8);
        response.content().writeBytes(buffer);
        buffer.release();

        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }

    private static void sendListing_small1(ChannelHandlerContext ctx, File dir, String dirPath) {

        System.out.println("sendListing_small1 실행됨");

        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK);
        response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");

        StringBuilder buf = new StringBuilder()
                .append("<!DOCTYPE html>\r\n")
                .append("<html><head><meta charset='utf-8' />");
        buf.append("<img src=\"small1.jpg\" width=\"100\" height=\"50\">");




        buf.append("</ul></body></html>\r\n");
        ByteBuf buffer = Unpooled.copiedBuffer(buf, CharsetUtil.UTF_8);
        response.content().writeBytes(buffer);
        buffer.release();

        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }

    private static void sendListing_small2(ChannelHandlerContext ctx, File dir, String dirPath) {

        System.out.println("sendListing_small2 실행됨");

        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK);
        response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");

        StringBuilder buf = new StringBuilder()
                .append("<!DOCTYPE html>\r\n")
                .append("<html><head><meta charset='utf-8' />");
        buf.append("<img src=\"small2.jpg\" width=\"100\" height=\"50\">");




        buf.append("</ul></body></html>\r\n");
        ByteBuf buffer = Unpooled.copiedBuffer(buf, CharsetUtil.UTF_8);
        response.content().writeBytes(buffer);
        buffer.release();

        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }

    private static void sendListing(ChannelHandlerContext ctx, File dir, String dirPath) {

//        //---------------------------------------------------------------------------------------------------------------------
        //DB 연결코드 시작



          String JDBC_DRIVER = "com.mysql.jdbc.Driver";
          String DB_URL = "jdbc:mysql://127.0.0.1:3306/tn";
 
          String USERNAME = "root";
          String PASSWORD = "tn";
 
          String no = "";
          String name = "";
 
        Connection conn = null;
        Statement stmt = null;
        try{
            Class.forName(JDBC_DRIVER);
            conn = DriverManager.getConnection(DB_URL,USERNAME,PASSWORD);
            System.out.println("\n- MySQL Connection");
            stmt = conn.createStatement();
 
            String sql;
            sql = "SELECT no, name FROM tn";
            ResultSet rs = stmt.executeQuery(sql);
 
//        //---------------------------------------------------------------------------------------------------------------------
 
 
            FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK);
            response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
 
            StringBuilder buf = new StringBuilder()
                    .append("<!DOCTYPE html>\r\n")
                    .append("<html><head><meta charset='utf-8' />");
 
 
 
//        //---------------------------------------------------------------------------------------------------------------------
            while(rs.next()){
                buf.append(rs.getString("name"));
            }
//        //---------------------------------------------------------------------------------------------------------------------
 
 
 
            buf.append("</ul></body></html>\r\n");
            ByteBuf buffer = Unpooled.copiedBuffer(buf, CharsetUtil.UTF_8);
            response.content().writeBytes(buffer);
            buffer.release();
 
            // Close the connection as soon as the error message is sent.
            ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
 
 
 
//        //---------------------------------------------------------------------------------------------------------------------
            rs.close();
            stmt.close();
            conn.close();
        }catch(SQLException se1){
            se1.printStackTrace();
        }catch(Exception ex){
            ex.printStackTrace();
        }finally{
            try{
                if(stmt!=null)
                    stmt.close();
            }catch(SQLException se2){
            }
            try{
                if(conn!=null)
                    conn.close();
            }catch(SQLException se){
                se.printStackTrace();
            }
        }
        System.out.println("\n\n- MySQL Connection Close");
        //---------------------------------------------------------------------------------------------------------------------
 
 
    }
 
    private static void sendRedirect(ChannelHandlerContext ctx, String newUri) {
        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, FOUND);
        response.headers().set(LOCATION, newUri);
 
        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }
 
    private static void sendError(ChannelHandlerContext ctx, HttpResponseStatus status) {
        FullHttpResponse response = new DefaultFullHttpResponse(
                HTTP_1_1, status, Unpooled.copiedBuffer("Failure: " + status + "\r\n", CharsetUtil.UTF_8));
        response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
 
        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }
 
    /**
     * When file timestamp is the same as what the browser is sending up, send a "304 Not Modified"
     *
     * @param ctx
     *            Context
     */
    private static void sendNotModified(ChannelHandlerContext ctx) {
        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, NOT_MODIFIED);
        setDateHeader(response);
 
        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }
 
    /**
     * Sets the Date header for the HTTP response
     *
     * @param response
     *            HTTP response
     */
    private static void setDateHeader(FullHttpResponse response) {
        SimpleDateFormat dateFormatter = new SimpleDateFormat(HTTP_DATE_FORMAT, Locale.US);
        dateFormatter.setTimeZone(TimeZone.getTimeZone(HTTP_DATE_GMT_TIMEZONE));
 
        Calendar time = new GregorianCalendar();
        response.headers().set(DATE, dateFormatter.format(time.getTime()));
    }
 
    /**
     * Sets the Date and Cache headers for the HTTP Response
     *
     * @param response
     *            HTTP response
     * @param fileToCache
     *            file to extract content type
     */
    private static void setDateAndCacheHeaders(HttpResponse response, File fileToCache) {
        SimpleDateFormat dateFormatter = new SimpleDateFormat(HTTP_DATE_FORMAT, Locale.US);
        dateFormatter.setTimeZone(TimeZone.getTimeZone(HTTP_DATE_GMT_TIMEZONE));
 
        // Date header
        Calendar time = new GregorianCalendar();
        response.headers().set(DATE, dateFormatter.format(time.getTime()));
 
        // Add cache headers
        time.add(Calendar.SECOND, HTTP_CACHE_SECONDS);
        response.headers().set(EXPIRES, dateFormatter.format(time.getTime()));
        response.headers().set(CACHE_CONTROL, "private, max-age=" + HTTP_CACHE_SECONDS);
        response.headers