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"); responseContent.append("<tr>"); responseContent.append("<tr>"); responseContent.append("<td>"); responseContent.append("</table>\r\n"); responseContent.append("<CENTER>
"); // POST responseContent.append("<CENTER>POST FORM
"); responseContent.append("<FORM ACTION=\"/formpost\" METHOD=\"POST\">"); responseContent.append("<input type=hidden name=getform value=\"POST\">"); responseContent.append("<table border=\"0\">"); responseContent.append("<tr>"); responseContent.append("<tr>"); responseContent.append("<tr>"); responseContent.append("<td>"); responseContent.append("</table>\r\n"); responseContent.append("<CENTER>
"); // POST with enctype="multipart/form-data" responseContent.append("<CENTER>POST MULTIPART FORM
"); responseContent.append("<FORM ACTION=\"/formpostmultipart\" ENCTYPE=\"multipart/form-data\" METHOD=\"POST\">"); responseContent.append("<input type=hidden name=getform value=\"POST\">"); responseContent.append("<table border=\"0\">"); responseContent.append("<tr>"); responseContent.append("<tr>"); responseContent.append("<tr>"); responseContent.append("<td>"); responseContent.append("</table>\r\n"); responseContent.append("<CENTER>
"); responseContent.append("</body>"); responseContent.append("</html>"); ByteBuf buf = copiedBuffer(responseContent.toString(), CharsetUtil.UTF_8); // Build the response object. FullHttpResponse response = new DefaultFullHttpResponse( HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf); response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html; charset=UTF-8"); response.headers().setInt(HttpHeaderNames.CONTENT_LENGTH, buf.readableBytes()); // Write the response. ctx.channel().writeAndFlush(response); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { logger.log(Level.WARNING, responseContent.toString(), cause); ctx.channel().close(); } }

Other Java examples (source code examples)

Here is a short list of links related to this Java HttpUploadServerHandler.java source code file:

Java example source code file (HttpUploadServerHandler.java)

This example Java source code file (HttpUploadServerHandler.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

attribute, center, clear, fileupload, form, input, log, logging, name, net, network, noshade, post, send, string, type, util, value, width

The HttpUploadServerHandler.java Java example source code

/*
 * 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.upload;

import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http.QueryStringDecoder;
import io.netty.handler.codec.http.cookie.Cookie;
import io.netty.handler.codec.http.cookie.ServerCookieDecoder;
import io.netty.handler.codec.http.cookie.ServerCookieEncoder;
import io.netty.handler.codec.http.multipart.Attribute;
import io.netty.handler.codec.http.multipart.DefaultHttpDataFactory;
import io.netty.handler.codec.http.multipart.DiskAttribute;
import io.netty.handler.codec.http.multipart.DiskFileUpload;
import io.netty.handler.codec.http.multipart.FileUpload;
import io.netty.handler.codec.http.multipart.HttpData;
import io.netty.handler.codec.http.multipart.HttpDataFactory;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.EndOfDataDecoderException;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.ErrorDataDecoderException;
import io.netty.handler.codec.http.multipart.InterfaceHttpData;
import io.netty.handler.codec.http.multipart.InterfaceHttpData.HttpDataType;
import io.netty.util.CharsetUtil;

import java.io.IOException;
import java.net.URI;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import static io.netty.buffer.Unpooled.*;

public class HttpUploadServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    private static final Logger logger = Logger.getLogger(HttpUploadServerHandler.class.getName());

    private HttpRequest request;

    private boolean readingChunks;

    private HttpData partialContent;

    private final StringBuilder responseContent = new StringBuilder();

    private static final HttpDataFactory factory =
            new DefaultHttpDataFactory(DefaultHttpDataFactory.MINSIZE); // Disk if size exceed

    private HttpPostRequestDecoder decoder;

    static {
        DiskFileUpload.deleteOnExitTemporaryFile = true; // should delete file
                                                         // on exit (in normal
                                                         // exit)
        DiskFileUpload.baseDirectory = null; // system temp directory
        DiskAttribute.deleteOnExitTemporaryFile = true; // should delete file on
                                                        // exit (in normal exit)
        DiskAttribute.baseDirectory = null; // system temp directory
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        if (decoder != null) {
            decoder.cleanFiles();
        }
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        if (msg instanceof HttpRequest) {
            HttpRequest request = this.request = (HttpRequest) msg;
            URI uri = new URI(request.uri());
            if (!uri.getPath().startsWith("/form")) {
                // Write Menu
                writeMenu(ctx);
                return;
            }
            responseContent.setLength(0);
            responseContent.append("WELCOME TO THE WILD WILD WEB SERVER\r\n");
            responseContent.append("===================================\r\n");

            responseContent.append("VERSION: " + request.protocolVersion().text() + "\r\n");

            responseContent.append("REQUEST_URI: " + request.uri() + "\r\n\r\n");
            responseContent.append("\r\n\r\n");

            // new getMethod
            for (Entry<String, String> entry : request.headers()) {
                responseContent.append("HEADER: " + entry.getKey() + '=' + entry.getValue() + "\r\n");
            }
            responseContent.append("\r\n\r\n");

            // new getMethod
            Set<Cookie> cookies;
            String value = request.headers().get(HttpHeaderNames.COOKIE);
            if (value == null) {
                cookies = Collections.emptySet();
            } else {
                cookies = ServerCookieDecoder.STRICT.decode(value);
            }
            for (Cookie cookie : cookies) {
                responseContent.append("COOKIE: " + cookie + "\r\n");
            }
            responseContent.append("\r\n\r\n");

            QueryStringDecoder decoderQuery = new QueryStringDecoder(request.uri());
            Map<String, List uriAttributes = decoderQuery.parameters();
            for (Entry<String, List attr: uriAttributes.entrySet()) {
                for (String attrVal: attr.getValue()) {
                    responseContent.append("URI: " + attr.getKey() + '=' + attrVal + "\r\n");
                }
            }
            responseContent.append("\r\n\r\n");

            // if GET Method: should not try to create a HttpPostRequestDecoder
            if (request.method().equals(HttpMethod.GET)) {
                // GET Method: should not try to create a HttpPostRequestDecoder
                // So stop here
                responseContent.append("\r\n\r\nEND OF GET CONTENT\r\n");
                // Not now: LastHttpContent will be sent writeResponse(ctx.channel());
                return;
            }
            try {
                decoder = new HttpPostRequestDecoder(factory, request);
            } catch (ErrorDataDecoderException e1) {
                e1.printStackTrace();
                responseContent.append(e1.getMessage());
                writeResponse(ctx.channel());
                ctx.channel().close();
                return;
            }

            readingChunks = HttpUtil.isTransferEncodingChunked(request);
            responseContent.append("Is Chunked: " + readingChunks + "\r\n");
            responseContent.append("IsMultipart: " + decoder.isMultipart() + "\r\n");
            if (readingChunks) {
                // Chunk version
                responseContent.append("Chunks: ");
                readingChunks = true;
            }
        }

        // check if the decoder was constructed before
        // if not it handles the form get
        if (decoder != null) {
            if (msg instanceof HttpContent) {
                // New chunk is received
                HttpContent chunk = (HttpContent) msg;
                try {
                    decoder.offer(chunk);
                } catch (ErrorDataDecoderException e1) {
                    e1.printStackTrace();
                    responseContent.append(e1.getMessage());
                    writeResponse(ctx.channel());
                    ctx.channel().close();
                    return;
                }
                responseContent.append('o');
                // example of reading chunk by chunk (minimize memory usage due to
                // Factory)
                readHttpDataChunkByChunk();
                // example of reading only if at the end
                if (chunk instanceof LastHttpContent) {
                    writeResponse(ctx.channel());
                    readingChunks = false;

                    reset();
                }
            }
        } else {
            writeResponse(ctx.channel());
        }
    }

    private void reset() {
        request = null;

        // destroy the decoder to release all resources
        decoder.destroy();
        decoder = null;
    }

    /**
     * Example of reading request by chunk and getting values from chunk to chunk
     */
    private void readHttpDataChunkByChunk() {
        try {
            while (decoder.hasNext()) {
                InterfaceHttpData data = decoder.next();
                if (data != null) {
                    // check if current HttpData is a FileUpload and previously set as partial
                    if (partialContent == data) {
                        logger.info(" 100% (FinalSize: " + partialContent.length() + ")");
                        partialContent = null;
                    }
                    try {
                        // new value
                        writeHttpData(data);
                    } finally {
                        data.release();
                    }
                }
            }
            // Check partial decoding for a FileUpload
            InterfaceHttpData data = decoder.currentPartialHttpData();
            if (data != null) {
                StringBuilder builder = new StringBuilder();
                if (partialContent == null) {
                    partialContent = (HttpData) data;
                    if (partialContent instanceof FileUpload) {
                        builder.append("Start FileUpload: ")
                            .append(((FileUpload) partialContent).getFilename()).append(" ");
                    } else {
                        builder.append("Start Attribute: ")
                            .append(partialContent.getName()).append(" ");
                    }
                    builder.append("(DefinedSize: ").append(partialContent.definedLength()).append(")");
                }
                if (partialContent.definedLength() > 0) {
                    builder.append(" ").append(partialContent.length() * 100 / partialContent.definedLength())
                        .append("% ");
                    logger.info(builder.toString());
                } else {
                    builder.append(" ").append(partialContent.length()).append(" ");
                    logger.info(builder.toString());
                }
            }
        } catch (EndOfDataDecoderException e1) {
            // end
            responseContent.append("\r\n\r\nEND OF CONTENT CHUNK BY CHUNK\r\n\r\n");
        }
    }

    private void writeHttpData(InterfaceHttpData data) {
        if (data.getHttpDataType() == HttpDataType.Attribute) {
            Attribute attribute = (Attribute) data;
            String value;
            try {
                value = attribute.getValue();
            } catch (IOException e1) {
                // Error while reading data from File, only print name and error
                e1.printStackTrace();
                responseContent.append("\r\nBODY Attribute: " + attribute.getHttpDataType().name() + ": "
                        + attribute.getName() + " Error while reading value: " + e1.getMessage() + "\r\n");
                return;
            }
            if (value.length() > 100) {
                responseContent.append("\r\nBODY Attribute: " + attribute.getHttpDataType().name() + ": "
                        + attribute.getName() + " data too long\r\n");
            } else {
                responseContent.append("\r\nBODY Attribute: " + attribute.getHttpDataType().name() + ": "
                        + attribute + "\r\n");
            }
        } else {
            responseContent.append("\r\nBODY FileUpload: " + data.getHttpDataType().name() + ": " + data
                    + "\r\n");
            if (data.getHttpDataType() == HttpDataType.FileUpload) {
                FileUpload fileUpload = (FileUpload) data;
                if (fileUpload.isCompleted()) {
                    if (fileUpload.length() < 10000) {
                        responseContent.append("\tContent of file\r\n");
                        try {
                            responseContent.append(fileUpload.getString(fileUpload.getCharset()));
                        } catch (IOException e1) {
                            // do nothing for the example
                            e1.printStackTrace();
                        }
                        responseContent.append("\r\n");
                    } else {
                        responseContent.append("\tFile too long to be printed out:" + fileUpload.length() + "\r\n");
                    }
                    // fileUpload.isInMemory();// tells if the file is in Memory
                    // or on File
                    // fileUpload.renameTo(dest); // enable to move into another
                    // File dest
                    // decoder.removeFileUploadFromClean(fileUpload); //remove
                    // the File of to delete file
                } else {
                    responseContent.append("\tFile to be continued but should not!\r\n");
                }
            }
        }
    }

    private void writeResponse(Channel channel) {
        // Convert the response content to a ChannelBuffer.
        ByteBuf buf = copiedBuffer(responseContent.toString(), CharsetUtil.UTF_8);
        responseContent.setLength(0);

        // Decide whether to close the connection or not.
        boolean close = request.headers().contains(HttpHeaderNames.CONNECTION, HttpHeaderValues.CLOSE, true)
                || request.protocolVersion().equals(HttpVersion.HTTP_1_0)
                && !request.headers().contains(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE, true);

        // Build the response object.
        FullHttpResponse response = new DefaultFullHttpResponse(
                HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf);
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain; charset=UTF-8");

        if (!close) {
            // There's no need to add 'Content-Length' header
            // if this is the last response.
            response.headers().setInt(HttpHeaderNames.CONTENT_LENGTH, buf.readableBytes());
        }

        Set<Cookie> cookies;
        String value = request.headers().get(HttpHeaderNames.COOKIE);
        if (value == null) {
            cookies = Collections.emptySet();
        } else {
            cookies = ServerCookieDecoder.STRICT.decode(value);
        }
        if (!cookies.isEmpty()) {
            // Reset the cookies if necessary.
            for (Cookie cookie : cookies) {
                response.headers().add(HttpHeaderNames.SET_COOKIE, ServerCookieEncoder.STRICT.encode(cookie));
            }
        }
        // Write the response.
        ChannelFuture future = channel.writeAndFlush(response);
        // Close the connection after the write operation is done if necessary.
        if (close) {
            future.addListener(ChannelFutureListener.CLOSE);
        }
    }

    private void writeMenu(ChannelHandlerContext ctx) {
        // print several HTML forms
        // Convert the response content to a ChannelBuffer.
        responseContent.setLength(0);

        // create Pseudo Menu
        responseContent.append("<html>");
        responseContent.append("<head>");
        responseContent.append("<title>Netty Test Form\r\n");
        responseContent.append("</head>\r\n");
        responseContent.append("<body bgcolor=white>");

        responseContent.append("<table border=\"0\">");
        responseContent.append("<tr>");
        responseContent.append("<td>");
        responseContent.append("<h1>Netty Test Form");
        responseContent.append("Choose one FORM");
        responseContent.append("</td>");
        responseContent.append("</tr>");
        responseContent.append("</table>\r\n");

        // GET
        responseContent.append("<CENTER>GET FORM
"); responseContent.append("<FORM ACTION=\"/formget\" METHOD=\"GET\">"); responseContent.append("<input type=hidden name=getform value=\"GET\">"); responseContent.append("<table border=\"0\">"); responseContent.append("<tr>
Fill with value:
Fill with value:
"); responseContent .append("<tr>
Fill with value:
"); responseContent.append("</td>
Fill with value:
Fill with value:
"); responseContent .append("<tr>
Fill with value:
"); responseContent.append("<tr>
Fill with file (only file name will be transmitted):
" + "<input type=file name=\"myfile\">"); responseContent.append("</td>
Fill with value:
Fill with value:
"); responseContent .append("<tr>
Fill with value:
"); responseContent.append("<tr>
Fill with file:
"); responseContent.append("</td>
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