public class RedisTest {  public static void main(String[] args) {    Jedis jedis = new Jedis("127.0.0.1", 6379);    jedis.set("eat", "I want to eat");  }}

  public static void main(String[] args) throws IOException {    ServerSocket server = new ServerSocket(6379);    Socket socket = server.accept();    byte[] chars = new byte[64];    socket.getInputStream().read(chars);    System.out.println(new String(chars));  }

*3$3SET$3eat$13I want to eat

*3  数组包含3个元素，分别是SET、eat、I want to eat$3  是一个字符串，且字符串长度为3SET 字符串的内容$3  是一个字符串，且字符串长度为3eat 字符串的内容$13 是一个字符串，且字符串长度为13I want to eat 字符串的内容

*2$3GET$3eat

public RedisClient(String host, int port){    try {      this.socket = new Socket(host,port);      this.outputStream = this.socket.getOutputStream();      this.inputStream = this.socket.getInputStream();    } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }

  public String set(final String key, String value) {    StringBuilder sb = new StringBuilder();    //虽然输出的时候，会被转义，然而我们传送的时候还是要带上\r\n    sb.append("*3").append("\r\n");    sb.append("$3").append("\r\n");    sb.append("SET").append("\r\n");    sb.append("$").append(key.length()).append("\r\n");    sb.append(key).append("\r\n");    sb.append("$").append(value.length()).append("\r\n");    sb.append(value).append("\r\n");    byte[] bytes= new byte[1024];    try {      outputStream.write(sb.toString().getBytes());      inputStream.read(bytes);    } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }    return new String(bytes);  }

    RedisClient redisClient = new RedisClient("127.0.0.1", 6379);    String result = redisClient.set("eat", "please eat");    System.out.println(result);

+OK