t; + ret2.length);
// 写出文件
String writePath = System.getProperty("user.dir") + File.separatorChar + "receive" + File.separatorChar
+ "006.jpg";
FileOutputStream fos = new FileOutputStream(writePath);
fos.write(ret2);
fos.close();
}
}
UDP的实现
代码示例:
public class Server {
public void run(int port) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group).channel(NioDatagramChannel.class).option(ChannelOption.SO_BROADCAST, true)
.handler(new ServerHandler());
b.bind(port).sync().channel().closeFuture().await();
} finally {
group.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
new Server().run(8765);
new Server().run(8764);
}
}
public class ServerHandler extends
SimpleChannelInboundHandler<DatagramPacket> {
// 谚语列表
private static final String[] DICTIONARY = {
"只要功夫深,铁棒磨成针。",
"旧时王谢堂前燕,飞入寻常百姓家。",
"洛阳亲友如相问,一片冰心在玉壶。",
"一寸光阴一寸金,寸金难买寸光阴。",
"老骥伏枥,志在千里。烈士暮年,壮心不已!"
};
private String nextQuote() {
int quoteId = ThreadLocalRandom.current().nextInt(DICTIONARY.length);
return DICTIONARY[quoteId];
}
@Override
public void messageReceived(ChannelHandlerContext ctx, DatagramPacket packet)
throws Exception {
String req = packet.content().toString(CharsetUtil.UTF_8);
System.out.println(req);
if ("谚语字典查询?".equals(req)) {
ctx.writeAndFlush(
new DatagramPacket(Unpooled.copiedBuffer("谚语查询结果: " + nextQuote(),
CharsetUtil.UTF_8), packet.sender()));
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
ctx.close();
cause.printStackTrace();
}
}
public class Client {
public void run(int port) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap()