public void run(final int port, final String url) throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new Ni
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oEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
// 添加请求消息解码器
ch.pipeline().addLast(“http-decoder”, new HttpRequestDecoder());
//HttpObjectAggregator的作用 将多个消息转换为单一的FullHttpRequest或者FullHttpResponse
ch.pipeline().addLast(“http-aggregator”, new HttpObjectAggregator(65536));
// 添加响应解码器
ch.pipeline().addLast(“http-encoder”, new HttpResponseEncoder());
// 支持异步发送大的码流(大的文件传输),但不占用过多的内存，防止java内存溢出
ch.pipeline().addLast(“http-chunked”, new ChunkedWriteHandler());
// 添加自定义handler 处理文件服务器业务逻辑
ch.pipeline().addLast(“fileServerHandler”, new HttpFileServerHandler(url));
}
});
ChannelFuture future = b.bind(“127.0.0.1”, port).sync();
System.out.println("HTTP文件目录服务器启动，网址是 : " + “http://127.0.0.1:” + port + url);
future.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port = 8080;
if (args.length > 0) {
try {
port = Integer.parseInt(args[0]);
} catch (NumberFormatException e) {
e.printStackTrace();
}
}
String url = DEFAULT_URL;
if (args.length > 1)
url = args[1];
new HttpFileServer().run(port, url);
}
}
HttpFileServerHandler
package com.dpb.netty.http;
import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
import static io.netty.handler.codec.http.HttpHeaders.setContentLength;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpHeaders.Names.LOCATION;
import static io.netty.handler.codec.http.HttpMethod.GET;
import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
import static io.netty.handler.codec.http.HttpResponseStatus.FOUND;
import static io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
import static io.netty.handler.codec.http.HttpResponseStatus.METHOD_NOT_ALLOWED;
import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.regex.Pattern;
import javax.activation.MimetypesFileTypeMap;
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.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.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.stream.ChunkedFile;
import io.netty.util.CharsetUtil;
public class HttpFileServerHandler extends SimpleChannelInboundHandler {
private final String url;
public HttpFileServerHandler(String url) {
this.url = url;
}
@Override
public void messageReceived(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
// 解码失败 400
if (!request.getDecoderResult().isSuccess()) {
sendError(ctx, BAD_REQUEST);
return;
}
// 只支持get方法
if (request.getMethod() != GET) {
sendError(ctx, METHOD_NOT_ALLOWED);
return;
}
//
final String uri = request.getUri();
// 处理Uri地址
final String path = sanitizeUri(uri);
if (path == null) {
sendError(ctx, FORBIDDEN);
return;
}
File file = new File(path);
// 如果文件不存在，或不可访问
if (file.isHidden() || !file.exists()) {
sendError(ctx, NOT_FOUND);
return;
}
// 如果请求是文件夹
if (file.isDirectory()) {
// 请求以 '/'结尾，列出该文件夹下的所有内容
if (uri.endsWith("/")) {
sendListing(ctx, file);
} else {
// 否则自动补全’/’ 然后再重定向访问
sendRedirect(ctx, uri + ‘/’);
}
return;
}
if (!file.isFile()) {
sendError(ctx, FORBIDDEN);
return;
}
RandomAccessFile randomAccessFile = null;
try {
randomAccessFile = new RandomAccessFile(file, “r”);// 以只读的方式打开文件
} catch (FileNotFoundException fnfe) {
sendError(ctx, NOT_FOUND);
return;
}
long fileLength = randomAccessFile.length();
// 创建一个默认的Http响应
HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
// 设置响应文件大小
setContentLength(response, fileLength);
// 设置 content Type
setContentTypeHeader(response, file);
// 设置 keep alive
if (isKeepAlive(request)) {
response.headers().set(CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
}
ctx.write(response);
ChannelFuture sendFileFuture;
//通过Netty的ChunkedFile对象直接将文件写入发送到缓冲区中
sendFileFuture = ctx.write(new ChunkedFile(randomAccessFile, 0, fileLength, 8192), ctx.newProgressivePromise());
sendFileFuture.addListener(new ChannelProgressiveFutureListener() {
@Override
public void operationProgressed(ChannelProgressiveFuture future, long progress, long total) {
if (total < 0) { // total unknown
System.err.println("Transfer progress: " + progress);
} else {
System.err.println("Transfer progress: " + progress + " / " + total);
}
}
@Override
public void operationComplete(ChannelProgressiveFuture future) throws Exception {
System.out.println(“Transfer complete.”);
}
});
ChannelFuture lastContentFuture = ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
//如果不支持keep-Alive，服务器端主动关闭请求
if (!isKeepAlive(request)) {
lastContentFuture.addListener(ChannelFutureListener.CLOSE);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
if (ctx.channel().isActive()) {
sendError(ctx, INTERNAL_SERVER_ERROR);
}
}
private static final Pattern INSECURE_URI = Pattern.compile(".[<>&"].");
private String sanitizeUri(String uri) {
try {
uri = URLDecoder.decode(uri, “UTF-8”);
} catch (UnsupportedEncodingException e) {
try {
uri = URLDecoder.decode(uri, “ISO-8859-1”);
} catch (UnsupportedEncodingException e1) {
throw new Error();
}
}
if (!uri.startsWith(url)) {
return null;
}
if (!uri.startsWith("/")) {
return null;
}
uri = uri.replace(’/’, File.separatorChar);
if (uri.contains(File.separator + ‘.’) || uri.contains(’.’ + File.separator) || uri.startsWith(".")
|| uri.endsWith(".") || INSECURE_URI.matcher(uri).matches()) {
return null;
}
return System.getProperty(“user.dir”) + File.separator + uri;
