netty长字符串传送问题

[SincereXing]

最近有个socket通信项目，我用了netty，可是后来发现传送字符串过长时，字符被截了，
后来一查发现有LengthFieldBasedFrameDcoder这个encode，可是用了出错，我的要求是
传输时用字符串
以下是我改了之后的代码：
1./**
2. * 消息解码器
3. *
4. */
5.public class MessageDecoder extends LengthFieldBasedFrameDecoder {
6.
7. public MessageDecoder(int maxFrameLength, int lengthFieldOffset,
8. int lengthFieldLength, int lengthAdjustment, int initialBytesToStrip) {
9.
10. super(maxFrameLength, lengthFieldOffset, lengthFieldLength,
11. lengthAdjustment, initialBytesToStrip);
12. }
13.
14. @Override
15. protected Object decode(ChannelHandlerContext ctx, Channel channel,
16. ChannelBuffer buffer) throws Exception {
17.
18. ChannelBuffer frame = (ChannelBuffer) super.decode(ctx, channel, buffer);
19. if (frame == null) {
20. return null;
21. }
22.
23. byte[] bytes = new byte[frame.readInt()];
24. frame.readBytes(bytes);
25.
26. String content = new String(bytes);
27. return content;
28. }
29.
30. @Override
31. protected Object decodeLast(ChannelHandlerContext ctx, Channel channel,
32. ChannelBuffer buffer) throws Exception {
33.
34. return this.decode(ctx, channel, buffer);
35. }
36.
37.}


1./**
2. * 消息编码器
3. *
4. */
5.public class MessageEncoder extends LengthFieldPrepender {
6.
7. public MessageEncoder(int lengthFieldLength) {
8. super(lengthFieldLength);
9. }
10.
11. @Override
12. protected Object encode(ChannelHandlerContext ctx, Channel channel,
13. Object obj) throws Exception {
14.
15. ChannelBuffer ob = ChannelBuffers.dynamicBuffer(channel.getConfig().getBufferFactory());
16.
17. String message = (String)obj;
18.
19. byte[] strBytes = message.getBytes();
20. ob.writeInt(strBytes.length);
21. ob.writeBytes(strBytes);
22.
23. return super.encode(ctx, channel, ob);
24. }
25.
26.}


01.bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
02. public ChannelPipeline getPipeline() throws Exception {
03. ChannelPipeline pipeline = new DefaultChannelPipeline();
04. pipeline.addLast("decoder", new MessageDecoder(Integer.Max_Value,0,4,0,4));
pipeline.addLast("encoder", new MessageEncoder(4));
05. pipeline.addLast("handler", new Handler);
06. return pipeline;
07. }
08. });

我原来是这样的（下面是手打的，可能有出入），运行正常的：
01.bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
02. public ChannelPipeline getPipeline() throws Exception {
03. ChannelPipeline pipeline = new DefaultChannelPipeline();
04. pipeline.addLast("decoder", new StringDecoder));
pipeline.addLast("encoder", new StringEncoder);
05. pipeline.addLast("handler", new Handler);
06. return pipeline;
07. }
08. });
但是长字符串不行了，后来网上查了，就改成上面的，但是出错，求高手出现

[platfrom]

new MessageDecoder(Integer.Max_Value,0,4,0,4)); 应该是参数问题吧，看看每个参数的意义

[huaye]

很明显你的编解码有问题：你的解码都没考虑解包和粘包的问题。有一个数据包可能被分成了几个数据包，向文件不可能一次性传送完。mina官网的编解码已经很简单了。 解码：判断数据长度是不是够，不够就不读取，累积到下一次再度，然后咋判断，不够在累积，够就返回字符串。

[happy_0000]

解决了吗?我也想知道答案

[wm850730498]

楼主最后怎么解决的啊？ 和大家分享一下吧