根据老师在课堂上讲的resp协议，手撸一个redis-cli，可以直接与server交互

package test;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
//测试使用，不做流处理关闭
public class ClientTest {
static Socket socket=null;
    public static void main(String[] args) throws IOException {
    start("127.0.0.1",6379);
    }

    private static void start(String s, int port) throws IOException {

        //连接server
      socket = new Socket(s, port);

        //
         setS("test","mxd");
        getS("test");
    }
  //resp协议      *3是3个参数  set key value   ,$代表输入几个字节，\r\n回车换行
    private static void setS(String key, String val) throws IOException {
        InputStream in = socket.getInputStream();
        OutputStream out = socket.getOutputStream();
        StringBuffer s = new StringBuffer();
        s.append("*3").append("\r\n");
        s.append("$3").append("\r\n");
        s.append("set").append("\r\n");
        s.append("$").append(key.getBytes().length).append("\r\n");
        s.append(key).append("\r\n");
        s.append("$").append(val.getBytes().length).append("\r\n");
        s.append(val).append("\r\n");
        out.write(s.toString().getBytes());
        byte[] bytes = new byte[1024];
        //把服务器返回的读入输入流中
        int len = in.read(bytes);
        System.out.println(new String(bytes,0,len));
    }

    private static void getS (String key) throws IOException{
        InputStream in = socket.getInputStream();
        OutputStream out = socket.getOutputStream();
        StringBuffer s = new StringBuffer();
        s.append("*2").append("\r\n");
        s.append("$3").append("\r\n");
        s.append("get").append("\r\n");
        s.append("$").append(key.getBytes().length).append("\r\n");
        s.append(key).append("\r\n");
        out.write(s.toString().getBytes());
        byte[] bytes = new byte[1024];
        //把服务器返回的读入输入流中
        int len = in.read(bytes);
        System.out.println(new String(bytes,0,len));
    }

}