netty-tomcat-sample/rpc-tomcatv1/src/main/java/cn/hhj/nio/buffer/BufferSlice.java

package cn.hhj.nio.buffer;
import java.nio.ByteBuffer;

/**
 * 缓冲区分片
 */
public class BufferSlice {  
    static public void main( String args[] ) throws Exception {  
        ByteBuffer buffer = ByteBuffer.allocate( 10 );  
          
        // 缓冲区中的数据0-9  
        for (int i=0; i<buffer.capacity(); ++i) {  
            buffer.put( (byte)i );  
        }  
          
        // 创建子缓冲区  
        buffer.position( 3 );  
        buffer.limit( 7 );  
        ByteBuffer slice = buffer.slice();  
          
        // 改变子缓冲区的内容  
        for (int i=0; i<slice.capacity(); ++i) {  
            byte b = slice.get( i );  
            b *= 10;  
            slice.put( i, b );  
        }  
          
        buffer.position( 0 );  
        buffer.limit( buffer.capacity() );  
          
        while (buffer.remaining()>0) {  
            System.out.println( buffer.get() );  
        }  
    }  
}