问题描述
有一个旧版应用程序可以通过TCP执行json.
There is a legacy application which does json over TCP.
我使用一台Netty服务器,我想通过Gson将json转换为Pojo.
I use a netty server, and I want to convert the json into a Pojo via Gson.
为此,我转换创建了一个解码器,该解码器将ByteBuf作为输入并创建我的对象".
In order to do this, I convert created a Decoder which take as input a ByteBuf and create My Object.
问题在于Bytebuf的大小为1024,而json的大小要大得多(> 20mo)
The problem is the Bytebuf has a size of 1024, and the json is much much more bigger than that (>20mo)
@Sharable
public class RequestDecoder extends MessageToMessageDecoder<ByteBuf> {
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception {
InputStream json = new ByteBufInputStream(msg);
InputStreamReader inputStreamReader = new InputStreamReader(json, Charsets.UTF_8);
JsonReader reader;
reader = new JsonReader(inputStreamReader);
reader.setLenient(true);
Request object = new Gson().fromJson(reader, Request.class);
try {
reader.close();
} catch (IOException e) {
throw new RuntimeException("uncloseable reader", e);
}
out.add(object);
}
}
我总是得到一个:
com.google.gson.stream.MalformedJsonException: Unterminated string at line 1 column 1020
当我调试时,我仅在"ByteBuf msg"中获得1024个第一个字节
and when I debug I only get the 1024 first byte in the "ByteBuf msg"
如何将ByteBuf容量设置为其最大容量? (调试时,我看到ByteBuf是一个SimpleLeakAwareByteBuf,最大容量为2147483647)
How can I set a ByteBuf capacity to its max capacity? (when debugging I see that ByteBuf is a SimpleLeakAwareByteBuf with a maxCapacity of 2147483647)
如何摆脱这种局限性?
推荐答案
我在管道的开头添加了DelimiterBasedFrameDecoder:
I added a DelimiterBasedFrameDecoder at the beginning of the pipeline :
pipeline.addLast("framer", new DelimiterBasedFrameDecoder(Integer.MAX_VALUE, Unpooled.wrappedBuffer(new byte[]{'E', 'O', 'F', '\n'})));
因为我发现所有json均以"EOF \ n"终止(由于遗留问题)
Because I discovered that all json were terminated with "EOF\n" (due to legacy issues)
现在对我来说还可以,但是当这个遗留问题解决后会发生什么?
That's ok for me now, but what will happen when this legacy issue is resolved?
这篇关于Netty ByteBuf解码时无法获得大量输入的完整消息的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!