netty服务端加解密

参考链接：https://www.cnblogs.com/silyvin/articles/11827030.html

一、解密

1、自定义解密类

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

//自定义解密
public class CustomDecoder extends ByteToMessageDecoder {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        byte [] bytes = new byte[in.readableBytes()];
        in.readBytes(bytes);
        byte [] encoded = Utils.decryp(bytes);; //自定义解密方法
        ByteBuf buf = Unpooled.wrappedBuffer(encoded);
        out.add(buf);
    }
}

　2、加入到pipeline中

ChannelPipeline pipeline = ch.pipeline();
 pipeline.addLast(new CustomDecoder());//解密操作

二、加密

1、自定义加密类

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

public class HJ212MessageEncoder extends MessageToByteEncoder<HJ212PackBean> {

    @Override
    protected void encode(ChannelHandlerContext ctx, HJ212PackBean bean, ByteBuf byteBuf) throws Exception {

        String response = "";

        //自定义拼接回复内容response

        byte[] bytes=response.getBytes();
        bytes = Utils.encryp(bytes);//自定义加密方法
      
        ctx.writeAndFlush(Unpooled.copiedBuffer(bytes));
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        logger.error("编码异常" + cause.getMessage());
        ctx.close();
    }
}

2、加入到pipeline

ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast(new HJ212MessageEncoder());