说明

io.netty.buffer.ByteBuf有个函数clear()，它可以将ByteBuf的readerIndex和writerIndex都设置为0。

代码示例

package com.thb;import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;public class Demo {public static void main(String[] args) {ByteBuf buf = Unpooled.buffer();buf.writeByte(104);buf.writeByte(22);System.out.println("before clear, buf.readerIndex: " + buf.readerIndex());System.out.println("before clear, buf.writerIndex: " + buf.writerIndex());System.out.println("before clear, buf.readableBytes: " + buf.readableBytes());System.out.println("--------------------------------");buf.clear();System.out.println("after clear, buf.readerIndex: " + buf.readerIndex());System.out.println("after clear, buf.writerIndex: " + buf.writerIndex());System.out.println("after clear, buf.readableBytes: " + buf.readableBytes());}}

运行输出：

before clear, buf.readerIndex: 0
before clear, buf.writerIndex: 2
before clear, buf.readableBytes: 2
--------------------------------
after clear, buf.readerIndex: 0
after clear, buf.writerIndex: 0
after clear, buf.readableBytes: 0