Question

我正在使用套接字连接从Android手机向Netty服务器发送一些字节。当Netty服务器获得一些字节时，它将使用DataInputStream .readUTF从正在读取的服务器端发送PONG消息这是我的服务器处理程序代码

package com.nearbuy.fbb.netty.server.handler;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.nearbuy.fbb.netty.server.models.MetaDetails;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;
import org.apache.tomcat.util.codec.binary.Base64;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.*;
import java.util.Arrays;
import java.util.HashMap;


public class ServerHandler extends ChannelInboundHandlerAdapter {
    private static final String CONNECTION_CLOSE_COMMAND = "image_streaming_close";
    private String imageFile = "";
    private static HashMap<String, byte[]> fileBytesMap = new HashMap<>();
    private static HashMap<String, Integer[]> fileWHDetailsMap = new HashMap<>();
    private static HashMap<String, String> fileNameMap = new HashMap<>();
    private boolean isMetaReceived = false;
    private int PROCESS_ID_LENGTH = "PROCESS_ID".length();
    private MetaDetails metaDetails = new MetaDetails();
    private static final String META_DATA_ACKNOWLEDGE = "META_DATA_RECEIVING";
    private static final String CLOSE_CONNECTION = "CLOSE_CONNECTION";

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf inBuffer = (ByteBuf) msg;
        byte[] packetBytes = new byte[inBuffer.readableBytes()];
        inBuffer.readBytes(packetBytes);
        // some logics with bits
        writePongBackToClient(ctx);
    }
    private void writePongBackToClient(ChannelHandlerContext ctx){
ChannelFuture cf = ctx.write(Unpooled.copiedBuffer("PONG", CharsetUtil.UTF_8));
        ctx.flush();
        if (!cf.isSuccess()) {
            System.out.println("Send failed: " + cf.cause());
        }
        System.out.println(cf.isDone());
    }
}

在Android方面，我与具有上述处理程序的Bootstrapserver建立了连接。它从Android获取字节，但是当我将字节写回客户端时，Datainputstream无法获取字节。这是客户端

private void createSocketConnection(){
    try{
        socket = new Socket(IP_ADDRESS, 9999);
        outputStream = new DataOutputStream(socket.getOutputStream());
        inputStream = new DataInputStream(socket.getInputStream());
        socket.setKeepAlive(true);
        socket.setTcpNoDelay(true);
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
private boolean writeToSocketStream(byte [] byteArray) throws InterruptedException {
    try {

        Log.i("Writing bytes", "New byte came of Byte length is "+ byteArray.length);
        outputStream.write(byteArray);
        outputStream.flush();
        String pong = inputStream.readUTF();
        Log.i("Response ", pong);
        Log.i("Written bytes ", "Last bytes are not buffered, just written");
        return true;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}

但是它永远不会从Datainputstream中获取任何字符串，它只是挂在那一行:( 我无法确定实际问题在哪里。服务器不写消息还是客户端有问题。如果您需要服务器启动器代码，那么我可以将其放在这里:) 我使用ChannelFuture从服务器端检查了服务器回写，但Android无法获取

ChannelFuture cf = ctx.write(Unpooled.copiedBuffer("PONG", CharsetUtil.UTF_8));
        ctx.flush();
        if (!cf.isSuccess()) {
            System.out.println("Send failed: " + cf.cause());
        }
        System.out.println(cf.isDone());

它打印真实

套接字连接数据输入流似乎不起作用

0 个答案: