Netty+SpringBoot写一个基于Http协议的文件服务器
本文参考《Netty权威指南》
NettyApplication
package com.xh.netty;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class NettyApplication {
public static void main(String[] args) {
SpringApplication.run(NettyApplication.class, args);
String[] argList =args;
System.out.println("+++++++++++++Simple Netty HttpFileServer+++++++++++++++");
System.out.println("+ VERSION 1.0.1 +");
System.out.println("+ AUTHER:XH +");
System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++");
if (args.length==0){
System.out.println("Usage: java -var thisPackageName.jar [-options][args...]");
System.out.println("Use -h for more infomation");
System.out.println("default port is 8080 , webRoot is /root ");
}else {
for (int i=0;i<argList.length;i++){
if (argList[i].equalsIgnoreCase("-h")){
System.out.println("-p your Listern port");
System.out.println("-f your webRoot path");
System.out.println("Example:java -jar netty-0.0.1-SNAPSHOT.jar -p 80 -f /root");
return;
}else {
if (argList[i].equalsIgnoreCase("-p")){
try{
HttpFileServer.PORT=Integer.valueOf(argList[i+1]);
}catch (NumberFormatException e){
System.out.println("wrong number for you port");
System.out.println("Use -h for more infomation");
e.printStackTrace();
return;
}
}
if (argList[i].equalsIgnoreCase("-f")){
try{
HttpFileServer.WEBROOT=argList[i+1];
}catch (Exception e){
System.out.println("wrong path for you webRoot");
System.out.println("Use -h for more infomation");
e.printStackTrace();
return;
}
}
}
}
}
try {
HttpFileServer.main();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
HttpFileServer
package com.xh.netty;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.stream.ChunkedWriteHandler;
/**
* Created by root on 8/14/17.
*/
public class HttpFileServer {
public static String WEBROOT = "/root";
public static int PORT = 8080;
public void run(final int port , final String url) throws InterruptedException {
EventLoopGroup bossGroup=new NioEventLoopGroup();
EventLoopGroup workerGroup=new NioEventLoopGroup();
try{
ServerBootstrap bootstrap=new ServerBootstrap();
bootstrap.group(bossGroup,workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() {
protected void initChannel(SocketChannel socketChannel) throws Exception {
socketChannel.pipeline().addLast("http-decoder",new HttpRequestDecoder());
socketChannel.pipeline().addLast("http-aggregator",new HttpObjectAggregator(65536));
socketChannel.pipeline().addLast("http-encoder",new HttpResponseEncoder());
socketChannel.pipeline().addLast("http-chunked",new ChunkedWriteHandler());
socketChannel.pipeline().addLast("fileServerHandler",new HttpFileServerHandler(url));
}
});
ChannelFuture future = bootstrap.bind("127.0.0.1",port).sync();
System.out.println("服务器已启动>>网址:"+"127.0.0.1:"+port+url);
future.channel().closeFuture().sync();
}catch (Exception e){
e.printStackTrace();
}finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main() throws InterruptedException {
new HttpFileServer().run(PORT,WEBROOT);
}
}
HttpFileServerHandler
package com.xh.netty;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.handler.codec.http.*;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.stream.ChunkedFile;
import io.netty.util.CharsetUtil;
import javax.activation.MimetypesFileTypeMap;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.RandomAccessFile;
import java.net.URLDecoder;
import java.util.regex.Pattern;
import static io.netty.handler.codec.http.HttpHeaderNames.*;
import static io.netty.handler.codec.http.HttpHeaderUtil.isKeepAlive;
import static io.netty.handler.codec.http.HttpHeaderUtil.setContentLength;
import static io.netty.handler.codec.http.HttpHeaderValues.KEEP_ALIVE;
import static io.netty.handler.codec.http.HttpResponseStatus.*;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
/**
* Created by root on 8/14/17.
*/
public class HttpFileServerHandler extends SimpleChannelInboundHandler<FullHttpRequest>{
private final String url;
String WEBROOT = HttpFileServer.WEBROOT;
public HttpFileServerHandler(String url) {
this.url = url;
}
protected void messageReceived(ChannelHandlerContext channelHandlerContext, FullHttpRequest fullHttpRequest) throws Exception {
if (!fullHttpRequest.decoderResult().isSuccess()){
sendError(channelHandlerContext, HttpResponseStatus.BAD_REQUEST);
return;
}
if (fullHttpRequest.method()!= HttpMethod.GET){
sendError(channelHandlerContext,HttpResponseStatus.METHOD_NOT_ALLOWED);
return;
}
String uri=fullHttpRequest.uri();
if (uri==null||uri.trim().equalsIgnoreCase("")){
uri="/";
}
if (uri.trim().equalsIgnoreCase("/")){
uri= WEBROOT;
}
if(!uri.startsWith(WEBROOT)){
uri= WEBROOT +uri;
}
final String path=sanitizeUri(uri);
if (path==null){
sendError(channelHandlerContext,HttpResponseStatus.FORBIDDEN);
return;
}
File file=new File(path);
if (file.isHidden()||!file.exists()){
sendError(channelHandlerContext,HttpResponseStatus.NOT_FOUND);
return;
}
if (file.isDirectory()){
if (uri.endsWith("/")){
senfListing(channelHandlerContext,file);
}else {
sendRedirect(channelHandlerContext,uri+"/");
}
return;
}
if (!file.isFile()){
sendError(channelHandlerContext,HttpResponseStatus.FORBIDDEN);
return;
}
RandomAccessFile randomAccessFile=null;
try{
randomAccessFile=new RandomAccessFile(file,"r");
}catch (FileNotFoundException e){
e.printStackTrace();
sendError(channelHandlerContext,HttpResponseStatus.NOT_FOUND);
return;
}
Long fileLength=randomAccessFile.length();
HttpResponse httpResponse=new DefaultHttpResponse(HTTP_1_1,OK);
setContentLength(httpResponse,fileLength);
setContentTypeHeader(httpResponse,file);
if (isKeepAlive(fullHttpRequest)){
httpResponse.headers().set(CONNECTION,KEEP_ALIVE);
}
channelHandlerContext.writeAndFlush(httpResponse);
ChannelFuture sendFileFuture = channelHandlerContext.write(
new ChunkedFile(randomAccessFile,0,fileLength,8192),channelHandlerContext.newProgressivePromise());
sendFileFuture.addListener(new ChannelProgressiveFutureListener() {
public void operationProgressed(ChannelProgressiveFuture future, long progress, long total) {
if (total<0){
System.err.println("progress:"+progress);
}else {
System.err.println("progress:"+progress+"/"+total);
}
}
public void operationComplete(ChannelProgressiveFuture future) {
System.err.println("complete");
}
});
ChannelFuture lastChannelFuture=channelHandlerContext.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
if (!isKeepAlive(fullHttpRequest)){
lastChannelFuture.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(".*[<>&\"].*");
public String sanitizeUri(String uri){
try{
uri= URLDecoder.decode(uri,"UTF-8");
}catch (Exception e){
try{
uri= URLDecoder.decode(uri,"ISO-8859-1");
}catch (Exception ew){
ew.printStackTrace();
}
}
if (!uri.startsWith(url)){
return null;
}
if (!uri.startsWith("/")){
return null;
}
uri=uri.replace('/',File.separatorChar);
if (uri.contains(File.separator+'.')||uri.startsWith(".")||uri.endsWith(".")||INSECURE_URI.matcher(uri).matches()){
return null;
}
return uri;//System.getProperty("user.dir")+uri
}
private static final Pattern ALLOWED_FILE_NAME=Pattern.compile("[a-zA-Z0-9\\.]*");
private void senfListing(ChannelHandlerContext channelHandlerContext, File dir) {
FullHttpResponse response=new DefaultFullHttpResponse(HTTP_1_1,OK);
response.headers().set(CONTENT_TYPE,"text/html;charset=UTF-8");
StringBuilder builder =new StringBuilder();
String dirPath=dir.getPath();
builder.append("<!DOCTYPE html> \r\n");
builder.append("<html><head><title>");
builder.append(dirPath);
builder.append("目录:");
builder.append("</title></head><body>\r\n");
builder.append("<h3>");
builder.append(dirPath).append("目录:");
builder.append("</h3>\r\n");
builder.append("<ul>");
builder.append("<li>链接：<a href=\"../\">..</a></li>\r\n");
for (File f:dir.listFiles()){
if (f.isHidden()||!f.canRead()){
continue;
}
String fname=f.getName();
if (!ALLOWED_FILE_NAME.matcher(fname).matches()){
continue;
}
builder.append("<li>链接：<a href=\" ");
builder.append(fname);
builder.append("\" >");
builder.append(fname);
builder.append("</a></li>\r\n");
}
builder.append("</ul></body></html>\r\n");
ByteBuf byteBuf= Unpooled.copiedBuffer(builder, CharsetUtil.UTF_8);
response.content().writeBytes(byteBuf);
byteBuf.release();
channelHandlerContext.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
}
private void sendRedirect(ChannelHandlerContext channelHandlerContext, String newUri) {
FullHttpResponse response=new DefaultFullHttpResponse(HTTP_1_1,FOUND);
response.headers().set(LOCATION,newUri);
channelHandlerContext.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
}
private void sendError(ChannelHandlerContext channelHandlerContext, HttpResponseStatus status) {
FullHttpResponse response=new DefaultFullHttpResponse(
HTTP_1_1,status,Unpooled.copiedBuffer("Failure: "+status.toString()+"\r\n",
CharsetUtil.UTF_8));
response.headers().set(CONTENT_TYPE,"text/plain; charset=UTF-8");
channelHandlerContext.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
}
private void setContentTypeHeader(HttpResponse httpResponse, File file) {
MimetypesFileTypeMap mimetypesFileTypeMap=new MimetypesFileTypeMap();
httpResponse.headers().set(CONTENT_TYPE,mimetypesFileTypeMap.getContentType(file.getPath()));
}
}
打包发布：
cd 到项目target同级目录
mvn clean package
然后 cd target/
java -jar netty-0.0.1-SNAPSHOT.jar -h运行
