mina框架报异常，数据接收失败

Question

org.apache.mina.filter.codec.ProtocolDecoderException: java.nio.charset.MalformedInputException: Input length = 1 (Hexdump: 23 7B 58 54 3A D3 D0 CE CA CC E2 3B 54 3A 6E 75 6C 6C 3B 56 3A 6E 75 6C 6C 3B 4A 44 3A 6E 75 6C 6C 3B 57 44 3A 6E 75 6C 6C 3B 47 43 3A 6E 75 6C 6C 3B 48 57 3A 30 2E 30 30 3B 48 53 3A 30 2E 30 30 3B 48 46 3A 30 2E 30 30 3B 49 44 30 31 3A 6E 75 6C 6C 3B 53 4A 3A 6E 75 6C 6C 7D 23 0D 0A)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:180)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:60)
at org.apache.mina.filter.logging.MdcInjectionFilter.filter(MdcInjectionFilter.java:137)
at org.apache.mina.filter.util.CommonEventFilter.messageReceived(CommonEventFilter.java:70)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:60)
at org.apache.mina.core.session.IoEvent.run(IoEvent.java:64)
at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTask(OrderedThreadPoolExecutor.java:551)
at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTasks(OrderedThreadPoolExecutor.java:543)
at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.run(OrderedThreadPoolExecutor.java:487)
at java.lang.Thread.run(Unknown Source)
Caused by: java.nio.charset.MalformedInputException: Input length = 1
at java.nio.charset.CoderResult.throwException(Unknown Source)
at org.apache.mina.core.buffer.AbstractIoBuffer.getString(AbstractIoBuffer.java:1122)
at org.apache.mina.filter.codec.textline.TextLineDecoder.decodeAuto(TextLineDecoder.java:207)
at org.apache.mina.filter.codec.textline.TextLineDecoder.decode(TextLineDecoder.java:138)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:170)
... 15 more
2640290 [pool-3-thread-2] WARN com.mina.MinaServerHandler8 - EXCEPTION, please implement com.mina.MinaServerHandler8.exceptionCaught() for proper handling:
org.apache.mina.filter.codec.ProtocolDecoderException: java.nio.charset.MalformedInputException: Input length = 1 (Hexdump: 23 7B 58 54 3A D3 D0 CE CA CC E2 3B 54 3A 6E 75 6C 6C 3B 56 3A 6E 75 6C 6C 3B 4A 44 3A 6E 75 6C 6C 3B 57 44 3A 6E 75 6C 6C 3B 47 43 3A 6E 75 6C 6C 3B 48 57 3A 30 2E 30 30 3B 48 53 3A 30 2E 30 30 3B 48 46 3A 30 2E 30 30 3B 49 44 30 31 3A 6E 75 6C 6C 3B 53 4A 3A 6E 75 6C 6C 7D 23 0D 0A)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:180)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:60)
at org.apache.mina.filter.logging.MdcInjectionFilter.filter(MdcInjectionFilter.java:137)
at org.apache.mina.filter.util.CommonEventFilter.messageReceived(CommonEventFilter.java:70)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:60)
at org.apache.mina.core.session.IoEvent.run(IoEvent.java:64)
at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTask(OrderedThreadPoolExecutor.java:551)
at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTasks(OrderedThreadPoolExecutor.java:543)
at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.run(OrderedThreadPoolExecutor.java:487)
at java.lang.Thread.run(Unknown Source)
Caused by: java.nio.charset.MalformedInputException: Input length = 1
at java.nio.charset.CoderResult.throwException(Unknown Source)
at org.apache.mina.core.buffer.AbstractIoBuffer.getString(AbstractIoBuffer.java:1122)
at org.apache.mina.filter.codec.textline.TextLineDecoder.decodeAuto(TextLineDecoder.java:207)
at org.apache.mina.filter.codec.textline.TextLineDecoder.decode(TextLineDecoder.java:138)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:170)
... 15 more

Answer 1

throws Exception {
final int packHeadLength = 8;
// 先获取上次的处理上下文，其中可能有未处理完的数据
Context ctx = getContext(session);
// 先把当前buffer中的数据追加到Context的buffer当中
ctx.append(in);
// 把position指向0位置，把limit指向原来的position位置
IoBuffer buf = ctx.getBuffer();
buf.flip();
System.out.println("buf.remaining()--------" + buf.remaining());
// 然后按数据包的协议进行读取
while (buf.remaining() >= packHeadLength) {
buf.mark();
// 读取消息头部分
int length = buf.getInt();
System.out.println("length==" + length);

// 检查读取是否正常，不正常的话清空buffer
if (length < 0 || length > m